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Low Noise Regulated Charge Pump with Selectable Output
POWER MANAGEMENT Description
The SC613 is a versatile charge pump designed for use in battery operated power supply applications. The wide input range is matched for Li-Ion battery applications. Only two 1uF ceramic bucket capacitors are required, and the inductorless implementation provides a reduced-EMI solution. Low noise mode switching circuitry and constant output current allow the use of 1uF input and output capacitors. The SC613 charge pump regulator can be used for applications that require up to 140mA of output current with a 4.5V output. The 5.0V output version provides up to 100mA of output current. The small package size, low component count and lower overall system cost coupled with its low noise make the SC613 a superior solution compared to switch mode regulator designs.
SC613
Features
Small size - MLP Micro 10 lead 3x3mm package Selectable 5.0V or 4.5V output voltage 140mA available with 4.5V output 100mA available with 5.0V output Short circuit protection Soft Start function Shutdown current <2A Selectable fixed frequencies of 262kHz and 650kHz Low ripple Regulated to +/-5% Ease of use
Applications
Cellular phones LED photo flash for cellular phones LED backlighting PDA power supplies Portable electronics Electronic books Wireless web appliances
Typical Application Circuit
U1 3 Cin 1.0uF 1 4.5V or 5.0V 2 9 Cbucket1 1.0uF Cout 1.0uF UP TO 10 LEDS 10 Cbucket2 1.0uF
2.7V to 6.5V
VIN
VOUT CF1+
6
EN
SC613
CF1-
4
FSEL CF2+
5
VSEL GND 8
CF2-
7
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SC613
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Supply Voltage Output Voltage VOUT Short Circuit Duration Thermal Resistance, Junction To Ambient (JESD51 Standard Method) Operating Ambient Junction Temperature Range Storage Temperature Range IR Reflow Temperature Symbol VIN VOUT SC J A TA TJC TSTG TLEAD Maximum -0.3 to +7.0 -0.3 to +7.0 Indefinite 31 -40 to +85 -40 to +150 -65 to +150 260 C/W C C C C Units V V
Electrical Characteristics
Unless specified: TA = -40C to 85C, Cin=Cbucket = 1.0F (ESR = 0.1), Cout=1.0uF (ESR = 0.1), Vin= 3.2V to 5.5V
Parameter Input Supply Voltage Quiescent Current Symbol VIN IQ Freq. = 262kHz, IOUT = 0mA, VIN = 3.7V Freq. =650kHz, IOUT = 0mA, VIN = 3.7V Enable = 0 Output Voltage VOUT Static Load Regulation with VSEL = 1 0mA < IOUT < 100mA Static Load Regulation with VSEL = 0 0mA < IOUT < 140mA Maximum Output Current IOUT VSEL = 1 VSEL = 0 Pump Frequency fPUMP Enable = 1, FSEL= 0 Enable = 1, FSEL = 1 Frequency Mode Transition Time TLOCK Transition time from one frequency mode to any other frequency mode guaranteed by design VOUT=0V, IOUT= IIN All input pins (Enable, VSEL, FSEL) All input pins (Enable, VSEL, FSEL)
2
Conditions
Min 2.5
Typ
Max 6.5
Units V mA mA A V
1.0 2.1
1.4 2.8 2
4.75
5.0
5.25
4.275
4.5
4.725
V
100 140 -15% -20% 262 650 1 +15% +20%
mA mA kHz kHz Period
Short Circuit Current Input High Threshold Input Low Threshold
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ISC VIH VIL
600 1.3 0.4
mA V V
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SC613
POWER MANAGEMENT Electrical Characteristics
Unless specified: TA = -40C to 85C, Cin=Cbucket = 1.0F (ESR = 0.1), Cout=1.0uF (ESR = 0.1), Vin= 3.2V to 5.5V
Parameter Input High Current Input Low Current
Symbol IIH IIL
Conditions All input pins (Enable, VSEL, FSEL) All input pins (Enable, VSEL, FSEL) VIN = 3.0V, VOUT = 5.0V, IOUT = 50mA Freq.=262kHz VIN = 3.0V, VOUT = 5.0V, IOUT = 50mA Freq.=650kHz freq = 262kHz, IOUT = 60mA
(1), (2)
Min
Typ
Max 10 10
Units A A % %
Power Efficiency from Battery to Regulated Charge Pump Output
82.5 81.5 25 45
h
Output Ripple Voltage
Note:
V PP
mV
(1) Peak to peak output ripple voltage with COUT=CBUCKET=1uF and X5R dielectric. (2) Guaranteed by design. (3) This device is ESD sensitive. Use of standard ESD handling precautions is required.
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SC613
POWER MANAGEMENT Pin Configuration Ordering Information
Device
VOUT CF1+ VIN FSEL VSEL 1 2 3 4 5 T TOP VIEW 10 9 8 7 6 CF2+ CF1GND CF2EN
Package (1) MLP-10 3x3mm Evaluation Board
SC613IMLTRT (2) S C 613E V B
Note: (1) Available in tape and reel only. A reel contains 3000 devices. (2) Available in lead-free package only. This product is fully WEEE and RoHS compliant.
MLP-10 3X3 LEAD
Pin Descriptions
Pin 1 2 3 4 5 6 7 8 9 10 T Pin Name VOUT C F 1+ VIN FS E L VSEL EN C F 2GND C F 1C F 2+ Thermal Pad Pin Function Output voltage regulated to 5.0V or 4.5V. Positive terminal of bucket capacitor 1. Input voltage ranging from 2.5V to 6.5V. Logic input for selecting the operational frequency. FSEL= 0, freq = 262kHz; FSEL= 1, freq = 650kHz. Logic input for selecting the output voltage. VSEL = 1, VOUT = 5V; VSEL = 0, VOUT = 4.5V. Active-high enable. Bias current is less than 2uA when set low. Negative terminal of bucket capacitor 2. Ground. Negative terminal of bucket capacitor 1. Positive terminal of bucket capacitor 2. Pad for heat sinking purposes - not connected internally. Connect to ground plane using multiple vias.
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SC613
POWER MANAGEMENT Block Diagram
VIN
3 DRIVERS MODE SELECT
SWITCH BLOCK EN OSC 650kHz or 262kHz
1
VOUT
EN
6
2 9 10 7
CF1+ CF1CF2+ CF2-
FSEL
4 5
VIN VOUT VREF COMPARATORS
VSEL
4 5
GND
8
TIMER VIN 5.0V or 4.5V
Applications Information
Charge Pump Doubler Type The SC613 uses a voltage doubler circuit which is implemented with two switched or `bucket' capactors. Most charge pump doublers use only one bucket capacitor. Two bucket capacitors switching on alternate phases greatly reduce the output ripple voltage and also reduce the size requirement for the output capacitor. Over Voltage Protection The output is prevented from exceeding 6.0V. This feature allows the use of 6.3V ceramic capacitors. Comparison with Other Regulation Methods In many instances, a charge pump regulator is the best choice for portable power applications. These regulators offer many advantages over switch mode regulators. A smaller bill of materials, less layout area, lower component height, less noise, no EMF, and less overall circuit cost are typical reasons to use this type of regulation. The efficiency of a charge pump regulator often approaches and in some cases exceeds the efficiency of a switch mode regulator. Inductors are often the largest and most expensive discrete component in a design. There are no inductors used in the SC613, so the inductor's cost and layout area are eliminated. The noise and EMF associated with the inductor are also eliminated. The SC613's fixed frequency harmonics are an advantage in portable communications equipment, such as cellular telephones. The SC613 has distinct frequencies of operation, so the harmonics are predictable. The harmonics are not fixed in a switch mode regulator. Switch mode regulators have harmonics which vary due to the pulse width modulation used to regulate the output. Varying harmonics can be a problem because it may be more
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difficult to ensure acceptable noise performance over the entire operating range. Many switch mode regulators have increased voltage ripple on the output during pulse skipping mode due to the fact that there are large periods of time when no current is supplied to the output. The SC613 supplies current to the output continuously, so the voltage ripple is less than a switch mode regulator, even with greatly reduced output capacitance. Frequency Selection The FSEL input is for frequency selection. A logic High level at this input will set the clock frequency to 650kHz, while a logic Low sets the clock to 262kHz. Input from a uP or other device may be used to change the charge pump frequency at any time. The optimal frequency will depend upon the capacitor values, the load current, and the exceptable amount of output ripple. Ripple Performance Examples of the output ripple per charge pump frequency and output voltage are listed in the Ripple Performance table on page 5. Efficiency Efficiency for the SC613 is defined as,
=
V IN ( 2 I O + I Q )
V O I O
where
VO = output voltage IO = output current VIN = input voltage IQ = quiescent current [from Electrical Characteristics on page 2].
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SC613
POWER MANAGEMENT Applications Information (cont.)
Table 2 -Ripple Performance TA = 25C, Cin=Cout=Cbucket = 1.0F (ESR = 0.1)
VOUT
Freq. [kHz ]
Ouput Ripple [mVp-p] at 100mA and Vin= 3.2V to 5.5V 25 15 25 15
5.0V
262 650 262 650
4.5V
Calculating Power Dissipation The power dissipated by the SC613 is calculated as,
PD
= =
P IN - P OUT
V IN 2 I O + I Q - V O I O
PD
(
)
Short Circuit and Over Temperature Protection The output is current limited to 600mA to protect against short circuit conditions. Over temperature protection is also provided. Design and Layout Considerations The center pad "thermal slug" is not internally connected to ground, but should be connected to ground in the layout through vias connecting to the ground plane. Pin 8 can be routed directly to the center pad. A good ground plane connection is important to make effective use of the low thermal resistance of the MLP package. Short Circuit and Over Temperature Protection The output is current limited to 600mA to protect against short circuit conditions. Over temperature protection is also provided. Design and Layout Considerations The center pad "thermal slug" is not internally connected to ground, but should be connected to ground in the layout through vias connecting to the ground plane. Pin 8 can be routed directly to the center pad. A good ground plane connection is important to make effective use of the low thermal resistance of the MLP package.
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SC613
POWER MANAGEMENT Typical Characteristics
Efficiency vs. Load Current
Efficiency vs. Load
80.0%
Line Regulation for 4.5V
4.55 4.5 4.45 Output Voltage [V] 4.4 4.35 4.3 4.25 4.2 4.15
650kHz, 75mA 650kHz, 140mA
70.0%
60.0%
50.0% Efficiency [%] 5V Output, 3.8V Input 40.0% 5V Output, 3.2V Input 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input 30.0%
20.0%
10.0%
4.1 4.05
0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 Load Current [mA]
0.0%
2.5
3
3.5
4 Input Voltage [V]
4.5
5
5.5
Load Regulation
Load Regulation
5.000
Line Regulation for 5.0V
5.1
4.900
5
4.800
4.9
4.700 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.600 4.5V Output, 3.2V Input
650kHz, 100mA
Output Voltage [V]
Output Voltage [V]
4.8
4.500
4.7
650kHz, 40mA
4.400
4.6
4.300 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 Load Current [mA]
4.5 2.5 3 3.5 4 Input Voltage [V] 4.5 5 5.5
Quiescent Current
Quiescent Currrent
2.500 2.300 2.100 1.900 Quiescent Current [mA] 1.700 1.500 1.300 1.100 0.900 0.700 0.500 2.700
Vo=4.5, 262kHz Vo=5.0V, 262kHz Vo=4.5V, 650kHz Vo=5.0V, 650kHz
3.200
3.700
4.200 Input Voltage [V]
4.700
5.200
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SC613
POWER MANAGEMENT
Start Up for 4.5V, 100mA Start Up for 5.0V, 100mA
Recommended Minimum Low Pulse Width
Recommended Minimum High Pulse Width
Recommended Minimum 100Hz PWM
Recommended Maximum 500Hz PWM
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SC613
POWER MANAGEMENT
Output Ripple on 5.0V Output at 262kHz Output Ripple on 5.0V Output at 650kHz
Output Ripple on 4.5V Output at 262kHz
Output Ripple on 4.5V Output at 650kHz
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SC613
POWER MANAGEMENT Application Schematic
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SC613
POWER MANAGEMENT Evaluation Board Bill of Materials
Reference U1 C1, C2, C3, C4 C5 R1 through R10 D1 through D10 Value SC613 1.0uF 10uF Comment MLP -Micro 10 lead 3x3mm. Ceramic, low ESR type, voltage of 6.3V rating is acceptable for all capacitors. This extra capacitor supports usage of long power leads from a benchtop supply. Add limiting resistors to meet the requirements of the application on 0805 pads. Add white or blue LEDs to meet the requirements of the application on 1206 pads.
Marking Information
Top Marking
yyww = Datecode (Example: 0252)
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SC613
POWER MANAGEMENT Evaluation Board Gerber Plots
Top View
Bottom View
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SC613
POWER MANAGEMENT Land Pattern - MLP 3x3-10
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 .000 .002 (.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.
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SC613
POWER MANAGEMENT Outline Drawing - MLP 3x3-10
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
Land Pattern- MLP-Micro 10
1.
NOTES:
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 FAX (805)498-3804
Visit us at: www.semtech.com
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