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Preliminary
RT9022
High Voltage, Low Quiescent, 60mA LDO Regulator
General Description
The RT9022 is designed for positive CCD bias applications with critical performance and space requirements. The RT9022 performance is optimized for battery-powered systems to deliver low noise and low quiescent current and with soft start function. The RT9022 also works well with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications and consumes less than 1A in shutdown mode. The other features include ultra low dropout voltage, high output accuracy, and current limiting protection. The part is available in the SOT-23-6, TSOT-23-6 and SC-70-6 packages.
Features
Low Quiescent Current (Typically 40A) Wide Operating Voltage Ranges : 5V to 20V Ultra-Fast Transient Response Tight Load and Line Regulation Current Limiting Protection Thermal Shutdown Protection Adjustable Soft Start Time RoHS Compliant and 100% Lead (Pb)-Free
Applications
DSC Camcorder
Pin Configurations
(TOP VIEW)
EN 6 1 VIN SS 5 2 FB 4 3
Ordering Information
RT9022 Package Type E : SOT-23-6 J6 : TSOT-23-6 U6 : SC-70-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard)
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.
VIN
GND VOUT
SOT-23-6 / TSOT-23-6 / SC-70-6 Note : There is no pin1 indicator on top mark for SOT-23-6 and SC-70-6 type, and pin 1 will be lower left pin when reading top mark from left to right.
Typical Application Circuit
1 1uF ON OFF 5 SS GND 2 6 EN VIN VOUT 3 1nF FB 4 R2 R1 2.2uF VOUT
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.
RT9022
VOUT = VFB (1+ R1 )V R2
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RT9022
Function Block Diagram
EN
Preliminary
Shutdown and Logic Control VREF -
VIN
FB SS
+
MOS Driver VOUT Current Limit and Thermal Protection
Error Amplifier
Soft Start
GND
Functional Pin Description
Pin Number Pin Name 1 2 3 4 5 6 VIN GND VOUT FB SS EN Pin Function Power Input Voltage. Ground. Output Voltage. Output Voltage Feedback. Soft Start and Noise Bypass. Chip Enable. (Active High)
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Preliminary Absolute Maximum Ratings
(Note 1)
RT9022
Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 21V Enable Voltage, VEN -------------------------------------------------------------------------------------------------- 18V Power Dissipation, PD @ TA = 25C SOT-23-6/TSOT-23-6 -------------------------------------------------------------------------------------------------- 300mW SC-70-6 ------------------------------------------------------------------------------------------------------------------ 225mW Package Thermal Resistance (Note 4) SOT-23-6/TSOT-23-6, JA -------------------------------------------------------------------------------------------- 250C/W SC-70-6, JA ------------------------------------------------------------------------------------------------------------ 333C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Junction Temperature ------------------------------------------------------------------------------------------------- 150C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 5V to 20V Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 100C Ambient Temperature Range ---------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VIN = VEN = 15V, CIN = 1F, COUT = 2.2F, TA = 25C, unless otherwise specified)
Parameter Input Power Quiescent Current Standby Current Reference Voltage Feedback Voltage Feedback Voltage Tolerance Feedback Input Current Soft Start Soft Start Current Output Output Current Limit Output Reverse Leakage Current Dropout Voltage Power Supply Rejection Rate Discharge Current
Symbol
Test Conditions IOUT = 0mA EN = GND VFB = VOUT , ILOAD = 1mA VFB = 1.3V
Min ----1.5 ---
Typ 40 -1.25 -10 1.5
Max 80 1 -+1.5 ---
Units A A V % nA A
ILIM
VIN = 15V, VOUT = 14V, ROUT = 50 VIN = Unconnected, Output set to 5V ILOAD = 30mA, VOUT = 14V f = 120Hz, VIN = V OUT + 1V, IOUT = 10mA f = 10KHz, V IN = VOUT + 1V, IOUT = 10mA EN = High to Low, VOUT = 14V
60 ------
80 30 0.2 65 55 20
--0.3 ----
mA A V dB dB mA
To be continued
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RT9022
Parameter EN EN Input Current EN High-Level Input Voltage EN Low-Level Input Voltage Thermal Protection Thermal Shutdown T emperature Thermal Shutdown Hysteresis Symbol
Preliminary
Test Conditions Min -1 2.4 -Typ Max Units A V V
EN = 15V
----
3 -0.6
VEN_ H VEN_ L
---
135 10
---
C C
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 (single-layer, 1S) of JEDEC 51-3 thermal measurement standard.
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Preliminary Typical Operating Characteristics
Output Voltage vs. Temperature
16.0
RT9022
Quiescent Current vs. Temperature
60
VIN = 18V, ILOAD = 0mA
VIN = 5V, VOUT = 1.25V
Output Voltage (V)
15.5
Quiescent Current (uA)
55
50
15.0
45
14.5
40
14.0 -50 -25 0 25 50 75 100
35 -50 -25 0 25 50 75 100
Temperature (C)
Temperature (C)
Feedback Voltage vs. Temperature
1.30
Dropout Voltage vs. Load Current
400
VIN = 5V
VOUT = 15V TJ = 100C
Dropout Voltage (mV)
Feedback Voltage (V)
1.28
300
TJ = 25C
1.26
200
1.24
TJ = -40C
100
1.22
1.20 -50 -25 0 25 50 75 100
0 0 10 20 30 40 50 60
Temperature (C)
Load Current (mA)
Line Transient Response
VOUT = 15V, ILOAD = 3mA
Line Transient Response
VOUT = 15V, ILOAD = 20mA
VIN 18 (V)
17
VIN 18 (V)
17
VOUT (10mV/Div)
VOUT (10mV/Div)
Time (1ms/Div)
Time (1ms/Div)
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RT9022
Load Transient Response
VIN = 18V, VOUT = 15V ILOAD = 3mA to 20mA
Preliminary
Load Transient Response
VIN = 18V, VOUT = 15V ILOAD = 3mA to 50mA
I LOAD (20mA/Div)
I LOAD (50mA/Div)
VOUT (5mV/Div)
VOUT (5mV/Div)
Time (1ms/Div)
Time (1ms/Div)
20
PSRR
VIN = VEN = 6.9V to 7V, VOUT = 5V ILOAD = 10mA
Power On/Off
VIN = 18V, VOUT = 15V, ILOAD = 20mA
0
VEN (10V/Div)
PSRR (dB)
-20
-40
VOUT (10V/Div) I IN (100mA/Div)
0.01 10 0.1 100 1 1000 10 10000 100 100000 1000 1000000
-60
-80
Time (2.5ms/Div)
Frequence (kHz) (Hz)
Region of Stable COUT ESR vs. Load Current
100.00
VIN = 18V, VOUT = 15V CIN = 1F/X7R, COUT = 2.2F/X5R Unstable Region
10.00
C OUT ESR ()
1.00
0.10
Stable Region
0.01 0 10 20 30 40 50 60
Load Current (A)
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Preliminary Application Information
Enable The RT9022 goes into sleep mode when the Enable pin is in a logic low condition. During this condition, the pass transistor, error amplifier, and bandgap are turned off, reducing the supply current to 1A. The Enable input is a CMOS logic and cannot be left floating. Output capacitor The RT9022 is specifically designed to use ceramic output capacitors as low as 2.2F. Ceramic capacitors below 10F offer significant cost and space saving, along with high frequency noise filtering. The RT9022 doesn't rely on a zero, which is generated by output capacitor ESR. So, the output capacitor ESR is not sensitive and very low ESR is allowed. Input capacitor A 1F input capacitor or greater located as close as possible to the IC is recommended. Larger input capacitor value with lower ESR provides better power supply noise rejection and line transient response. Larger load current requires larger capacitor value. PSRR The power supply rejection ratio (PSRR) is defined as the gain from the input to output divided by the gain from the supply to the output. The PSRR is found to be Thermal Consideration
RT9022
Thermal protection limits power dissipation in the RT9022. When the operating junction temperature exceeds 135C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turns on again after the junction temperature cools by 10C. 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 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 100C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of the RT9022, where TJ(MAX) is the maximum junction temperature of the die (100C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance ( JA is layout dependent) for T/SOT-23-6 package is 250C/W, and SC-70-6 package is 333C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = (100C - 25C) / 250C/W = 300mW for T/SOT-23-6 package PD(MAX) = (100C - 25C) / 333C/W = 225mW for SC-70-6 package The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For the RT9022 packages, the Figure 1 of de-rating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
PSRR = 20 x log Gain Error Supply
Note that when heavy load is measured, supply will cause temperature. And temperature will cause output voltage. So the temperature effect must be taken into consideration. Current Limit The RT9022 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage to limit the output current to 80mA typically. It protects the part even directly short the output to GND.
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RT9022
400 350
Preliminary
Single Layer PCB
Power Dissipation (mW)
300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100
T/SOT-23-6
SC-70-6
Ambient Temperature (C)
Figure 1. De-rating Curves
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Preliminary Outline Dimension
RT9022
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-6 Surface Mount Package
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RT9022
Preliminary
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
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Preliminary
RT9022
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 0.650 0.080 0.210 0.260 0.460 Max 1.100 0.100 1.350 0.400 2.450 2.250
Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.026 0.003 0.008 0.010 0.018 Max 0.044 0.004 0.054 0.016 0.096 0.089
SC-70-6 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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