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RT9010
300mA LDO Regulator with POR
General Description
RT9010 is a low noise, and low dropout with the sourcing ability up to 300mA and power-on reset function. The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input. RT9010 offers 2% accuracy, extremely low dropout voltage (240mV @ 300mA), and extremely low ground current. The shutdown current is near zero current which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection. RT9010 is short circuit thermal folded back protected. RT9010 lowers its OTP trip point from 165C to 110C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. RT9010 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. RT9010 is available in fixed output voltages in the TSOT-23-6 package.
Features
Wide Operating Voltage Ranges : 2.5V to 5.5V Low-Noise for RF Application No Noise Bypass Capacitor Required Fast Response in Line/Load Transient TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient 300mA LDO Outputs High Accuracy 2% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection Tiny TSOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances
Ordering Information
RT9010Package Type J6 : TSOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 12 : 1.20V 13 : 1.30V : : 35 : 3.50V 36 : 3.60V 1H : 1.85V 2F : 2.65V 2H : 2.85V
Pin Configurations
(TOP VIEW)
VIN 6 1 EN 5 2 SET 4 3
VOUT GND POR
TSOT-23-6 Note : There is no pin1 indicator on top mark for TSOT-23-6 type, and pin 1 will be lower left pin when reading top mark from left to right.
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100% matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail.
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RT9010
Typical Application Circuit
100K 6 1uF Chip Enable
VIN
VIN RT9010
POR
3
POR
5 4
VOUT EN SET GND
1 1uF 2
VOUT
CDELAY
Functional Pin Description
Pin No. 1 2 3 4 5 6 Pin Name VOUT GND POR SET EN VIN Output Voltage. Common Ground. Power-On Reset Output : Open-drain output. Active low indicates an output under voltage condition on regulator. Delay Set Input. Connect external capacitor to GND to set the internal delay. Chip Enable (Active High). Supply Input Voltage. Pin Function
Function Block Diagram
EN 0.2uA Shutdown and Logic Control VIN
VREF
-
+
MOS Driver VOUT Current Limit and Thermal Protection GND POR & Delay
Error Amplifier
SET
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RT9010
Absolute Maximum Ratings
(Note 1) -0.3V to 6V -0.3V to 6V 0.455W 220C/W 260C 150C -65C to 150C 2kV 200V Supply Input Voltage -----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C TSOT-23-6 ------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) TSOT-23-6, JA ------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range -------------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1F, TA = 25C, unless otherwise specified.)
Parameter Input Voltage Dropout Voltage (Note 5)
Symbol VIN VDROP VOUT VOUT VLINE
Test Conditions VIN = 2.5V to 5.5V IOUT = 150mA, VOUT > 2.8V IOUT = 300mA, VOUT > 2.8V IOUT = 1mA VIN = (VOUT + 0.3V) to 5.5V or VIN > 2.5V, whichever is larger
Min 2.5 --1.2 -2 --330 --1.5 -----
Typ -120 240 ----450 58 ---100 170 40
Max 5.5 --3.6 +2 0.2 0.6 700 80 1 -0.4 ----
Units V mV mV V % %/V % mA A A V ppm/C C C
Output Voltage Range Output Voltage Accuracy Line Regulation Load Regulation Current Limit Quiescent Current Shutdown Current EN Threshold Voltage Output Voltage TC Thermal Shutdown Thermal Shutdown Hysteresis Logic-Low
VLOAD 1mA < IOUT < 300mA ILIM IQ IQ_SD Logic-High VIH VIL TSD TSD RLOAD = 1 VEN > 1.5V VEN < 0.4V VIN = 2.5V to 5.5V, Power On VIN = 2.5V to 5.5V, Shutdown
To be continued
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RT9010
Parameter PSRR Loading=10mA Symbol PSRR Test Conditions f =100Hz f =1kHz f =10kHz f =100Hz PSRR Loading=150mA PSRR f =1kHz f =10kHz VTHL Reset Threshold VTHH POR Output Logic Low Voltage POR Leakage Current Set pin current source Set pin threshold High Threshold, % of nominal VOUT (Flag Off) ---1 0.60 --0.02 0.01 1.25 1.4 96 0.1 1 1.70 -% V A A V Low Threshold, % of nominal VOUT (Flag On) Min ------90 Typ -65 -60 -50 -65 -50 -50 -Max -------Units dB dB dB dB dB dB %
VPOR_L IL = 250A IPOR Flag off VSET = 0 POR = high
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. JA is measured in the natural convection at TA = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
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RT9010
Typical Operating Characteristics
Output Voltage vs. Temperature
1.9
Output Voltage vs. Temperature
3.4
RT9010-18
RT9010-33
Output Voltage (V)
Output Voltage (V)
1.85
3.35
1.8
3.3
1.75
3.25
1.7 -50 -25 0 25 50 75 100 125
3.2 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Quiescent Current vs. Temperature
70
Dropout Voltage vs. Load Current
350 300
Quiescent Current (uA)
65
Dropout Voltage (mV)
RT9010-33 VIN = VEN = 4.3V CIN = COUT 1uF/X7R
RT9010-33 TJ = 125C TJ = 25C
250 200 150 100 50
60
TJ = -40C
55
50 -50 -25 0 25 50 75 100 125
0 0 50 100 150 200 250 300
Temperature (C)
Load Current (mA)
20
PSRR
RT9010-15 VIN = 4.3V 0.1V CIN = COUT 1uF/X7R ILOAD = 100mA ILOAD = 50mA
10000 1000 100 10 1 0.1
POR Delay
RT9010-28
0
PSRR (dB)
-20
-40
ILOAD = 10mA
-60
POR Delay Time (ms)
-80
0.01 10
0.1 100
1 1000
10k 10000
100k 100000
1000k 1000000
0.01 0.0001 0.0001
0.0010 0.001
0.0100 0.01
0.1000 0.1
1.0000 1
Frequency (Hz) (Hz)
POR Setting Capacitance (uF)
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RT9010
Line Transient Response
RT9010-28, Both ILOAD = 1mA VIN = 3.8V to 4.8V 4.8 4.8
Line Transient Response
RT9010-28, Both ILOAD = 10mA VIN = 3.8V to 4.8V
VIN (V) 3.8
VIN (V) 3.8
VOUT (10mV/Div)
VOUT (10mV/Div)
Time (100s/Div)
Time (100s/Div)
Line Transient Response
RT9010-28, Both ILOAD = 50mA VIN = 3.8V to 4.8V 4.8 4.8
Line Transient Response
RT9010-28, Both ILOAD = 100mA VIN = 3.8V to 4.8V
VIN (V) 3.8
VIN (V) 3.8
VOUT (10mV/Div)
VOUT (10mV/Div)
Time (100s/Div)
Time (100s/Div)
Load Transient Response
RT9010-33, ILOAD = 10mA to 50mA VIN = VEN = 4.3V CIN = COUT = 1uF/X7R
Load Transient Response
RT9010-33, ILOAD = 10mA to 100mA VIN = VEN = 4.3V CIN = COUT = 1uF/X7R
IOUT (50mA/Div)
IOUT (100mA/Div)
VOUT (20mV/Div)
VOUT (20mV/Div)
Time (250s/Div)
Time (250s/Div)
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RT9010
Start Up
RT9010-28, VIN = 5V IOUT = 50mA
EN Pin Shutdown Response
RT9010-28, VIN = 5V IOUT = 50mA
(5V/Div)
VEN
(5V/Div)
V EN
V OUT
(1V/Div)
V OUT
(1V/Div) Time (5s/Div) Time (50s/Div)
Power-On
RT9010-28 ILOAD = 10mA 150 100
Noise
RT9010-33, No LOAD VIN = VEN = 4.5V(By battery) CIN = COUT = 1uF/X7R
Noise (V/Div)
VEN (5V/Div) VOUT (2V/Div) POR (5V/Div)
50 0 -50 -100 -150
Time (10s/Div)
Time (10ms/Div)
Noise
300 200 RT9010-33, ILOAD = 50mA VIN = VEN = 4.5V(By battery) CIN = COUT = 1uF/X7R
Noise (V/Div)
100 0 -100 -200 -300
Time (10ms/Div)
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RT9010
Applications Information
Like any low-dropout regulator, the external capacitors used with the RT9010 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9010 input and the amount of capacitance can be increased without limit. The input capacitor must be located a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RT9010 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1F with ESR is > 20m on the RT9010 output ensures stability. The RT9010 still works well with output capacitor of other types due to the wide stable ESR range. Figure 1. shows the curves of allowable ESR range as a function of load current for various output capacitor values. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The output capacitor should be located not more than 0.5 inch from the VOUT pin of the RT9010 and returned to a clean analog ground. Thermal Considerations Thermal protection limits power dissipation in RT9010. When the operation junction temperature exceeds 170C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 40C. RT9010 lowers its OTP trip level from 170C to 110C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. It limits IC case temperature under 100C and provides maximum safety to customer while output short circuit occurring.
VOUT Short to GND
0.4V VOUT
IOUT
TSD 170 C 110 C OTP Trip Point 110 C IC Temperature 80 C
Region of Stable COUT ESR vs. Load Current
100
Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs (Patent) For continuous operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is : PD = (VIN - VOUT) x IOUT + VIN x IQ
Region of Stable C OUT ESR () Region of Stable C OUT ESR ()
RT9010-28, VIN = 5V CIN = 1uF/X7R Unstable Region
10
1
0.1
Stable Region
0.01
Simulation Verify Unstable Region
0.001 0 50 100 150 200 250 300
The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD(MAX) = ( TJ(MAX) - TA ) /JA Where T J(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance.
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Load Current (mA)
Figure 1. Stable Cout ESR Range
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RT9010
For recommended operating conditions specification of RT9010, where T J(MAX) is the maximum junction temperature of the die (125C) and TA is the operated ambient temperature. The junction to ambient thermal resistance (JA is layout dependent) for TSOT-23-6 package is 220C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = ( 125C - 25C) / (220C/W) = 0.455 W for TSOT-23-6 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT9010 packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
0.50 0.45
Power Dissipation (W)
0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0 25 50 75 100 125
TSOT-23-6
Ambient Temperature (C)
Figure 3. Derating Curves for RT9010 Packages
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RT9010
Outline Dimension
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.700 0.000 1.397 0.300 2.591 2.692 0.838 0.080 0.300 Max 1.000 0.100 1.803 0.559 3.000 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.028 0.000 0.055 0.012 0.102 0.106 0.033 0.003 0.012 Max 0.039 0.004 0.071 0.022 0.118 0.122 0.041 0.010 0.024
TSOT-23-6 Surface Mount Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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