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Miniature Integrated High Current Lithium-Ion Battery Charger
POWER MANAGEMENT Description
The SC805 is a fully integrated, single cell, constant-current (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead free MLP package. The SC805 can operate as a stand-alone charger or in conjunction with a Power Management Controller (PMIC). The SC805 has a pre-charge function for trickle charging deeply discharged batteries. The fast charge current is enabled automatically when the battery voltage reaches the required threshold. When the battery reaches the constant voltage or CV portion of the charge curve the SC805 switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805 signals the charge cycle is complete. The SC805 can be configured to continue charging for a predetermined time before turning off, or to turn off immediately upon termination. After turning off its output, The SC805 enters monitor mode. If the battery voltage drops by 100mV from the CV voltage a new charge cycle will begin. The timer function also protects against charging faulty batteries by turning off if the pre-charge time exceeds 1/4 of the total programmed charge duration. The SC805 also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805 can also function as a general purpose current source or as a current source for charging nickelcadmium (NiCd) and nickel-metal-hydride (NiMH) batteries.
SC805
Features
Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor and thermal protection High Accuracy Charge Current* Tiny 3mm x 3mm 10 lead MLP package Programmable precharge, fastcharge & termination current Battery voltage controlled to 1% accuracy Built in timer for protection and complete charging NTC interface with battery detection Soft-start for step load and adaptor plug-in Up to 1A continuous charge current Input voltage range from 3V to 6V allows seamless charging from current limited adapter Provides adapter voltage VCCIL to power external accessories Battery Present detection and output indicator Operates in charger or LDO-mode without battery 0.1A battery drain current in shutdown and monitor modes Over current protection in all charging modes CHRGB output communicates charging and end of charge cycle *Patent Pending
Applications
Cellular phones PDA's Handheld meters Charging stations USB chargers Digital cameras Programmable current source
Charge Complete Indicator
Typical Application Circuit
SC805 VCC VOUT VCCIL CHRGB EN/NTC ITERM NOBAT IPRGM RTIME GND
SC805 typical Application Circuit
CHARGER VIN
C1 1uF
D1 LED
R2 3.01k
1 2 7 8 9
3 10 5 4 6 R4 3.01k
D2 LED R5 3.01k
D3 LED
BATTERY
C1 R6 1k R7 1k 2.2uF
Adapter Present Indicator
R1 3.01k
RT1 Thermistor
R3 3.01k
t
Charging Indicator
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SC805
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter VCC, VCCIL, EN/NTC to GND VOUT, NOBAT, IPRGM, CHRGB, ITERM, RTIME to GND Power Dissipation MLP (Derate 20mW/ C above 85C) Thermal Impedance, Junction to Case Junction Temperature Operating Ambient Temperature Range Peak IR Reflow temperature, soldering 20s-40s Storage Temperature Range VOUT short to GND IVCCIL + IVOUT Total Output Current
Symbol
Maximum -0.3 to 7.0 -0.3 to +6.0
Units V V W C/W C C C C A A
Pd JA TJ TA TLEAD TSTG
2 50* 150 -40 to +85 260 -65 to 150 Continuous
IOUT_TOT
1
*Calculated from package in still air, mounted to 3" to 4.5", 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted: VCC = 4.75V - 5.25V
Parameter
Symbol
Conditions Min
25oC Typ 5 Max
TA (-40oC to +85C) Min 3.15 Max 5.9 1 2.25 1 4.16 44 44.5 91.5 -5 4.24 54 53.5 111.5 +5
Units
Input Voltage Operating Current ICCDIS ICCCHG Battery Leakage Current Regulated Voltage Battery Pre-Charge Current Battery Termination Current Battery Fast-Charge Current IleakBAT VBAT*** IPREQ ITERM Resistor R = 3.01k ITERMQ IFastQ1 IFastQ2 IPRGM = 15k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 550mV 2.8V < VBATTERY < VBAT VIPRGM VITERM Shutdown Mode, EN = 0 Charging Mode CHRGB, ITERM, IPRG = 0A V C C = 0V
V A mA A V
0.1 1.2 0.1 4.20 50 50 100 787
mA
mA %
Battery Fast-Charge Max Current Limit Iprog Regulated Voltage Iterm Regulated Voltage
1.0 1.5 1.5 1.4 1.4 1.6 1.6
A V V
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SC805
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Symbol Conditions 25oC TA (-40oC to +85oC) Max Min 6.4 6.0 5.9 150 2.55 2.5 30 2.7 60 30.7 2.0 0.7 0.7 0.7 0.294Vcc 0.736Vcc 0.93Vcc 0.314Vcc 0.756Vcc 0.97Vcc 2.9 140 44.7 3.0 3.15 3.1 Max 7.5 7.15 V V mV V V mV V mV min hrs V V V V V V mV
Units
Min Vin OVP Rising Threshold Vin OVP Falling Threshold Vin OVP Hysteresis Vin UVLO Rising Threshold Vin UVLO Falling Threshold Vin UVLO Hysteresis Vbat Precharge Threshold Vbat Recharge Threshold Pre-Charge Fault Time-Out Charge Complete Time-Out Timer Disable Threshold LDO-Mode Select Threshold En-NTC Thresholds VTOVPR VTOVPF VTOVPH VTUVLOR VTUVLOF VTUVLOH VTPREQR VTREQ TPQFAULT TFASTQ VTTIMER VTIINTTS VTDIS VTNTCH VTNTCC VTNOBAT NTCHYS Over Temperature Shutdown CHRGB LED Output OT VCBVOH VCBVOL ICBOFF NoBat Output VNBVOH INBOFF VCCIL Resistance Reduced Fastcharge Current VCCILR IfqRed VBAT - VBATTERY Rtime=39.2k Rtime=39.2k Rtime VIL Voltage VCC-RTIME Voltage SC805 disable NTC Hot Vth Vcc=5 NTC Cold Vth Vcc=5 No Battery Detect Vcc=5 Hot/Cold Hysteresis Hysteresis = 10C Charge Complete Isrc=2mA Charging Isnk=2mA Disable or LDO-mode off leakage EN=VCC, Isrc=1mA EN=VCC/2 off leakage R VCC to VCCIL, I=100mA Vout=3.8v, Rprog=1.87k VCCIL load = 200mA
Typ 6.8 6.4 375 2.8 2.75 50 2.8 100 38 2.5 1.0 1.1 < 1.1 0.3VCC 0.75VCC 0.95VCC 50 150 4.5 0.2 0.1 4.8 0.1 0.2 585
C
4.3 0.05
5.0 0.5 1.0
V V A V
4.5 1.0
A W
545
625
mA
* Tied to PCB with 1 Square Inch, 2 Ounce Copper. Tja=41C/W using JESD 51 Standard ** Charge current is reduced by VCCIL current. VCCIL current is not limited by the IC *** Vbat load=75mA. See typical performance curves for load regulation.
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SC805
POWER MANAGEMENT Pin Configuration
Top View
VCC VCCIL VOUT IPRGM ITERM 1 2 3 4 5 10 9 8 7 6 CHRGB RTIME NOBAT EN/NTC GND
Ordering Information
Device
(1)
P ackag e MLP-10 Evaluation Board
SC805IMLTRT(2) S C 805E V B
Note: (1) Only available in tape and reel packaging. A reel contains 3,000 devices. (2) Available in lead-free packaging only. This product is fully WEEE and RoHS compliant.
MLP10: 3x3 10 Lead
Pin Descriptions
Pin # 1 2 3 4 5 6 7 Pin Name VC C VCCIL VOUT IPRGM ITERM GND EN/NTC Pin Function Supply pin, connect to adaptor power. Adapter input voltage. This pin provides a bias voltage approximately equal to the adapter input voltage. The output current when charging will be reduced by the load current on VCCIL. Charger output, connect to battery. Current limit program pin for charge and LDO-mode. Requires a resistor to ground to program fast-charge current. Selection for current termination and pre-charge current. Requires a resistor to ground to program pre-charge and termination current. Ground Combined device enable/disable and NTC input pin. Logic low disables the device. Analog voltages between 0.3VCC and 0.75VCC enable the NTC function. Voltages above 95% of VCC force the NOBAT output high. Battery Present Indicator. This output goes high when the NTC voltage exceeds 95% of VCC indicating the Battery and NTC have been removed. Charge time programming resistor. Connect a resistor between RTIME and GND to program the charge time. Force the pin to GND to disable the timer. Force the pin to VCC to select LDO-mode. Output status indicator designed to drive two LEDs. Connect cathode of the 'charging' led to this pin to indicate charge in progress. Connect the anode of the 'charge complete' led to this pin to indicate charge complete.
8 9
NOBAT RTIME
10
CHRGB
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SC805
POWER MANAGEMENT Block Diagram
VCC 1
Reference Voltages GND 6 Control
Vout Ref Fast Charge Ref Pre-Charge Ref VCCIL 2
Pre-Charge On Fast-Charge On Over Temp Under Voltage Over Voltage
NOBAT 8
EN/NTC 7 RTIME 9 CHRGB 10
NTC Interface
Timer
VOUT 3 IPRGM 4 Fast Charge Ref ITERM 5
VOUT Vout Ref Pre-Charge Ref
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SC805
POWER MANAGEMENT Applications Information
General Operation The SC805 is configured based on the application for Fast Charge and Termination current, timing requirements, and operation with and without a battery (LDO mode). A typical charging cycle is described below. Details on alternate applications and output programmability are covered in the individual sections. The charging cycle begins when the adapter is plugged in. The SC805 performs glitch filtering on the VCC input and initiates a charge cycle when VCC > UVLO. At this time, the CHRGB signal is active low turning on the charging LED. If the battery voltage is less than 2.8V, the SC805 will charge the output with the pre-charge current. When the battery voltage exceeds 2.8V, the SC805 enters fast-charge or constant current (CC) mode. When the battery voltage reaches its final value, the charger enters the constant voltage (CV) mode. In this mode the output current decreases as the battery continues to charge until the termination current level is reached. The CHRGB pin goes high when Iout is less than Itermination turning off the `charging' LED and turning on the `charge complete' LED. The SC805 continues to hold the battery in CV charge mode until the timer expires. At this point the charger enters the monitor mode where the output remains off until Vout drops by 100mV and a new charge cycle is initiated. Pre-Charge Mode Pre-charge mode is automatically enabled whenever the battery voltage is below 2.8V. It is used to limit the power dissipation and precondition the battery for fast charging. The pre-charge current value is selected by the resistor on the ITERM pin. The pre-charge current is programmable from 10mA to 125mA. The equation to select the pre-charge current is given by:
1.5 PCI = R TERM * 100
Fast-Charge Mode (CC) The fast-charge or CC mode is active when the battery voltage is above 2.8V and less than the CV or final float charge voltage of the battery. The fast-charge current can be set to a maximum of 1.0A and is selected by the program resistor on the IPRGM pin. The voltage on this pin will represent the current through the battery enabling a microprocessor via an analog-to-digital converter (ADC) to monitor battery current by sensing the voltage on the IPRGM pin. The equation to set the fast-charge current is given by:
1.5 * 1000 FCI = R PRGM
Note that for a given program resistor the current through the battery in CV mode can be determined by replacing 1.5 with the actual voltage on the IPRGM pin in the above equation. The superior fast-charge current accuracy of the SC805 is obtained by use of a patented* polarity-switched (i.e., chopped) current sense amplifier to nullify current measurement offset errors. Termination Current Once the battery reaches the program voltage of 4.2V the device will transition from a constant current source to a constant voltage source and the current through the battery begins to decrease while the voltage remains constant. When the current falls below the programmed termination current set by the termination resistor on the ITERM pin, the SC805 will transition the CHRGB pin from low to high. If the timer is enabled the output will continue to float charge in CV mode until the timer expires. If the timer is disabled than the output will turn off as soon as the termination current level is reached. If the part is in LDO mode the SC805 will remain on indefinitely at the regulated CV voltage. The equation to set the termination current is given by:
1.5 ITERM = R TERM * 100
If the charge timer is in use there is also a maximum allowed pre-charge duration. If the pre-charge time exceeds 1/4 of the total charge cycle the charger will turn off due to a pre-charge fault. This fault is cleared when EN or VCC is toggled or the output voltage rises above 2.8V.
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Monitor Mode When a charge cycle is completed, the SC805 output turns off and the device enters monitor mode. If the voltage of the battery falls below the recharge threshold
*US Patent 6,836,095 www.semtech.com
SC805
POWER MANAGEMENT Applications Information (Cont.)
of CV-100mV the charger will clear the charge timer and re-initiate a charge cycle. The maximum current drain of the battery during monitor mode will be no more than 1A over temperature. The status of the charger output as a function of RTime, and IOUT is shown below.
Output State On On Off On Off Rtime
VC C R R Low Low
Timer
N/A T < Timer T > Timer Disabled Disabled
Iout
N/A N/A N/A > Itermination < Itermination
NOBAT output The SC805 detects the absence of the battery by monitoring the voltage on the NTC pin. When the NTC pin voltage exceeds 95% of VCC the NOBAT output is driven high. This function utilizes the standard NTC configuration with the NTC component residing in the battery pack. When the battery is removed the NTC element in the resistor divider is missing and the NTC voltage is pulled up to VCC. The NOBAT output can be used to signal the system that the battery has been removed, drive an external LED, or fed back to the SC805 to select LDO-mode. Connect the NOBAT pin to the RTIME pin to select LDO mode when the battery is removed and re-enable the output of the SC805. LDO Mode The SC805 is designed to work with or without a battery. If the battery is not in place the device can enter LDO mode. In this mode the SC805 will act like a low dropout regulator. The input pin RTIME is used to select LDO mode. If RTIME is high the device will be in LDO mode. When LDO-mode is selected and the EN-NTC pin is greater than 90% of VCC the output will be on in LDO mode. During LDO mode the device will regulate the output voltage with a current limit set by the resistor tied to the IPRGM pin. EN-NTC Interface The Enable pin on the SC805 provides three functions; device disable, battery detection, and NTC temperature protection. It can be used to turn off the device by driving the pin to Ground. It can also be connected to an external resistor divider consisting of a resistor and an NTC Thermistor to disable the charge cycle when the temperature is out of range. If the pin is pulled to VCC the SC805 will signal a `No Battery' condition on the NOBAT pin. Note that the SC805 will be disabled due to the NTC function when the `No Battery' condition is detected due to the NTC feature. The NTC temperature fault can be overridden to re-enable the output of the charger for no battery conditions as described in the NOBAT section of the datasheet.
Charge Timer The timer on the SC805 is used as protection in the case of a faulty battery and to maximize charging capacity. Connect a resistor from the RTIME pin to GND to select the desired charge time duration according to the following equation. R Charge Time = TIME * 2.5hrs 39.2k The timer is programmable over the range of 1 to 10 hrs. To disable the charge timer connect RTIME to GND. Driving the RTIME pin to VCC will disable the timer and select LDO-mode operation for the SC805. One implementation of this feature is discussed in the NOBAT operating section. The SC805 will automatically turn off the output when the charge timer times out.
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SC805
POWER MANAGEMENT Applications Information (Cont.)
The NTC external component configuration is shown in the typical application schematic on page 1 of the datasheet. When the NTC voltage from the divider is above or below the cold and hot temperature threshold values the SC805 will suspend the charge cycle by turning off the output, freezing the charge timer, and indicating a fault on the CHRGB LED. Hysteresis is included for both hot and cold thresholds to avoid chatter at the NTC trip points. When the temperature returns to the valid range the SC805 will automatically resume the charge cycle. The charge timer will time-out when the SC805 output on-time exceeds the timer setting regardless of how long it has been disabled due to the NTC temperature. The internal NTC thresholds of 30% and 75% VCC were designed to work with Curve-2 type thermistors available from numerous vendors. Design Example based on the typical application schematic of page 1 using a Curve 2 Vishay-Dale NTC. Thot = 50oC Tcold = 0oC Find R2 and RT1 Step 1: Pick an RT1 value high enough to prevent selfheating.
RT1
The closest standard resistor value is 9.53k. RT(temp)/ RT(25oC) is often referred to as the ratio at the given temp. For this NTC at 50oC the ratio is 0.4086. Step 3: Calculate the Tcold value.
RTCOLD RT 25 R2 =3* = 2.86 10K
The ratio for the curve 2 NTC at 0oC is 2.816. The difference represents less than 1/2oC (i.e., actual trip would be -0.5oC instead of 0oC.) For temperature trip values other than 0oC and 50oC alternate curve-type NTC elements can be used or an additional resistor can be added to the Rntc divider to alter the temperture coefficient. CHRGB LED Flag The CHRGB LED driver on the SC805 can be used to drive two external LEDs: CHRGB=Low (Charging) and CHRGB=High (Charge Complete). The CHRGB output will be high impedance when the VCC is in a UV condition. The Table below defines the CHRGB LED output states.
(V (R T 1 ))2
DC
LE D CHRGB
High Iout < Iterm
Low Iout > term
High-Z VCCBlinking PreCharge OV or NTC Fault
In general lower values of RT1 provide more noise immunity for the NTC voltage at the expense of bias current from the input adapter. The dissipation constant DC is the power rating of the NTC resulting in a 1oC self heating error. The DC value for this NTC is 3mW and the voltage across the NTC is 2.5V for a 5V adapter. Therefore RT1 > 2K, Set RT1 = 10k Step 2: Find R2 to set the correct Hot level trip point,
R T50 = 9.52k R2 = 2.33 * R T25 * R T25
The CHRGB output can be used for a VCC indicator. When the SC805 is enabled the CHRGB output is either high or low providing the VCC input is above UVLO. The CHRGB output signifies the charging status. When the output current is > Itermination, CHRGB=low. CHRGB is high when Iout is < Itermination. The CHRGB output is latched high at the end of the charge cycle when the output current is less than Itermination. The CHRGB output will remain high until the timer expires and vbatt enters a re-charge cycle, or if EN, or VCC are toggled.
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SC805
POWER MANAGEMENT Applications Information (Cont.)
The CHRGB indicator operates the same way in both charge and LDO mode. The CHRGB output can be used for a VCC indicator. When the SC805 is enabled the CHRGB output is either high or low providing the VCC input is above UVLO. Alternately an LED connected to VCCIL can be used for a VCC indicator as shown in the typical application schematic on the front page of the datasheet. There are five fault modes detected by the SC805; (Input under voltage, input over voltage, NTC temperature, Max die temperature or OT and pre-charge timeout). The LED states for these fault modes are shown below.
Fault V C C U V LO VCC OVP NTC Fault Pre-Charge Time-out T j > 150oC CHRGB High-Z Blinking Blinking Blinking Blinking
Layout Guidelines The two most critical aspects of the pcb layout are the power path and thermal layout. The power path starts at the Adapter + input and runs to the VCC input of the SC805, then from the Vout pin of the SC805 to the Battery + terminal, and completes with the return trace from the battery - terminal to the adapter - input. All of these traces need to be designed to handle the required charging current. The trace from Vout of the SC805 is most critical and should be made as wide as possible to minimize IR drops between the regulated voltage at the SC805 vout pin and the battery terminal. Keep the Adapter+ to SC805 VCC input trace wide to minimize voltage drops that will add to the dropout voltage of the SC805. The GND pin of the SC805 should be connected in a kelvin fashion at the Battery-terminal to eliminate voltage drops in the return path which reduce the regulated battery voltage. The thermal performance of the SC805 package requires a low impedance connection from the heat slug on the bottom of the package to an external ground plane. This is best accomplished by using a single large via under the device connected to a ground plane on the bottom exposed side of the pcb. The evaluation board uses 1 square inch of copper on the bottom of the pcb and is capable of 1A charging current. The input and output bulk decoupling capacitors for the SC805 should be placed near the external terminals for the adapter and battery. This short low impedance loop is for the high current spikes that result from input/output hot-plugging of the charger. To minimize these current spikes the value of the decoupling capacitor should be minimized. A typical application requires a 0.1F input/output capacitor. If the distance from the external terminals to the SC805 is greater than 1", 0.1 local decoupling capacitors at the SC805 may be required.
Overcurrent and Max Temperature Protection Overcurrent protection is inherent in all modes of operation. When the device is in charge-mode the output is current limited to either the pre-charge current limit value or the fast charge current limit value depending on the voltage at the output. When the device is in LDO mode the output current is limited to the fast charge current limit. Max die temperature protection is included on the SC805. This feature allows the SC805 to operate with maximum power dissipation by disabling the output current when the die temperature reaches OT. The result is that the SC805 will operate as a pulse charger in extreme power dissipation applications delivering the maximum allowable output current while regulating the internal die temperature to a safe level.
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SC805
POWER MANAGEMENT Evaluation Board Schematic
Vout+ 1
R806 No Pop
R805 0
R4 1e6 Charge Complete Indicator D1 C2 1uF LED D2 LED R12 R1 1k Charging Indicator R2 1k 0 CHRGB VCCIL 1 1 3 10 2 8 7 SC805 VOUT VCC CHRGB RTIME VCCIL ITERM NOBAT IPRGM EN-NTC GND CHRG+ 1 9 5 4 6 1
D3 No Pop
EN-NTC 1
R7 No Pop R8 No Pop
C1 2.2uF RTIME 1
R3 No Pop Adapter Present Indicator NOBAT 1
IPGM 1
ITRM 1
R6 3.01K VOUT1
R5 1e6
R9 3.01K
R10 3.01K
R11 40K
CHRG1
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SC805
POWER MANAGEMENT Typical Characteristics
B a tte ry C h a rg e P ro file
4 .4 4 .2 4 3 .8 3 .6 3 .4 3 .2 3 0:00:00 0:12:30 0:25:00 0:37:30 0:50:00 1:02:30 1:15:00 1:27:30 1:40:00 1:52:30 2:05:00 2:17:30 2:30:00 2:42:30 2:55:00 3:07:30 3:20:00 3:32:30 3:45:00 0 .6 CURRENT (Amps)
15000
VOLTAGE (Volts)
0 .5 0 .4 0 .3 0 .2 0 .1 0
VCHRGB voltage not to scale, shown to indicate timing.
T IM E V C HA RGE V C HRGB I C HA RGE
Pre-Charge/Termination Current -vs- Rterm
90
FastC har C ur ent ge r
Fast Charge Current -vs- Rprgm Value 900 800 Output Current (mA) 700 600 500 400 300 200 100 0 1870 2140 2500 3000 3750 5000 7500 15000 30000
80
Pre-Charge Current
Output Current (mA)
70 60 50 40 30 20 10 0 1870 2140 2500 3000 3750 5000 7500 30000
Rpgrm Value (ohms)
Charge Tim er -vs- Rtim e 9 8 Fast-Charge Time-out (hrs) 7 6 5 4 3 2 1 0 1E+05 1E+05 15000 30000 50000 70000 90000
Pr C har Ti eege m out Fast C har Ti eout ge m
Rterm Value (ohms)
Drop-out Voltage f(Iout)
140 120 100 80 60 40 20 0 Pre-Charge Time-out (min)
0.25
V dr op R out
0.75 0.7 Drop-out Resistance (ohms) 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25
Drop-out Voltage (V)
0.2 0.15 0.1 0.05 0 100 250 Output Current (mA) 500
Rtim e (ohm s)
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SC805
POWER MANAGEMENT Typical Characteristics (Cont.)
Fast Charge Current Line Regulation f(vin) 502 501 500 Output Current (mA) 499 498 497 496 495 494 493 492 4.3 4.5 4.7 4.9 5.1 5.5 5.75 6 Input Voltage VCC (V)
Output Voltage Line Regulation f(Vin, Iout) 4.21 4.209 4.208 Output Voltage (V) 4.207 4.206 4.205 4.204 4.203 4.202 4.201 4.5
Unl oaded Vout Loaded Vout Unl oaded Er or( r %) Loaded Er or( r %)
Fast Charge Current Line Regulation f(vout)
5.00% 4.00% 3.00%
Output Current (mA)
501 500
5.00% 4.00% 3.00% 1.00% 0.00% -1.00%
FastChar Cur ent ge r
Percent Error (%)
1.00% 0.00% -1.00% -2.00%
FastChar Cur ent ge r FastChar Er or( ge r %)
498 497 496 495 3.00 3.20 3.40 3.60 3.80 4.00 4.10 4.15 4.20 Output Voltage Vout (V)
Output Voltage Load Regulation f(Iout)
FastChar Er or( ge r %)
-2.00% -3.00% -4.00% -5.00%
-3.00% -4.00% -5.00% 6.5
0.10% 0.08% 0.06% Output Voltage (V) Percent Error (% 0.04% 0.02% 0.00% -0.02% -0.04% -0.06% -0.08% -0.10% 6.0 6.5
4.211 4.21 4.209 4.208 4.207 4.206 4.205 4.204 0 50 100 150 200 250 300 350 400 450 500 Output Current (mA)
Pre-Charge Current Limit, Vcc < 4.2V
Loaded Vout Loaded Er or( r %)
0.00% -0.01% -0.02% -0.04% -0.05% -0.06% -0.07% -0.08% -0.09% -0.10% Percent Error (% -0.03%
5.0
5.5
Input Voltage VCC (V)
CC Current Limit, Vcc < 4.2V 510.0 490.0 Output Current (mA) 470.0 450.0 430.0 410.0 390.0 370.0 350.0 3 4 5 3.5 4.5 5.5 Input Voltage Vcc (volts)
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Fast Char Cur ent ge r % Er or r
5.00% 0.00% Output Current (mA) -5.00% Percent Error -10.00% -15.00% -20.00% -25.00% -30.00%
51.0 49.0 47.0 45.0 43.0 41.0 39.0 37.0 35.0 3 4 3.5 4.5 5 Input Voltage Vcc (volts) 5.5
Pr Char Cur ent ege r % Er or r
5.00% 0.00% -5.00% -10.00% -15.00% -20.00% -25.00% -30.00%
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Percent Error (%
2.00%
499
2.00%
SC805
POWER MANAGEMENT State Diagram
Under Voltage will force the SC805 into Shutdown Mode from any state. Over Voltage will disable the output, suspend the timer, and blink CHRGB
OVP> Vin > UVLO
Shutdown Mode Vout/Iout off CHRGB High Z
En=Hi Yes Soft Start Vout CHRGB Low CC=Constant Current CV=Constant Voltage
Soft Start CC Mode
Timer Enabled? Yes Start Timer Start Pre-Charge Time=0
Iout=1500/Rprog
Vout=CV Yes Start CV Mode Iout=150/Rterm IoutTmax Timer Enabled? Yes Iout2.8V
Time>Tmax/4 Yes Pre-Charge Timeout Fault CHRGB blinks at 1Hz Cleared by Vbat>2.8V or Re-cycle EN or VCC 0oC > NTC Temp >50oC
Time>Tmax
Vout< CV-100mV
Float Charge Mode Vout = CV
NTC out of Range Fault CHRGB blinks at 1Hz Timer is frozen Charge resumes when NTC Temperature is valid
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SC805
POWER MANAGEMENT Outline Drawing - MLP3x3-10
A E B
DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX
A A1 A2 b C D E e L N aaa bbb .039 .031 .002 .000 (.008) .007 .009 .011 .074 .079 .083 .042 .048 .052 .114 .118 .122 .020 BSC .012 .016 .020 10 .003 .004 0.80 1.00 0.00 0.05 (0.20) 0.18 0.23 0.30 1.87 2.02 2.12 1.06 1.21 1.31 2.90 3.00 3.10 0.50 BSC 0.30 0.40 0.50 10 0.08 0.10
E PIN 1 INDICATOR (LASER MARK)
A aaa C C 1 LxN 2 A1 A2 C
SEATING PLANE
D
N e bxN bbb CAB
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
Marking Information
805I yyww
Top view. Marking for the SC805 MLP 10 Lead package: yyww = Date Code (Example: 0349)
2005 Semtech Corp.
14
www.semtech.com
SC805
POWER MANAGEMENT Land Pattern - MLP3x3-10
K
DIM
(C) H G C G H K P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.112) .075 .055 .087 .020 .012 .037 .150 (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 3.80
Z
Y X P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2005 Semtech Corp.
15
www.semtech.com

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