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LDO_514
IP Library: High PSRR, Very Low power, 200mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s RF REGULATOR s VERY LOW DROPOUT VOLTAGE : 50mV s VERY LOW CONSUMPTION : 320A FULL
LOAD
APPLICATION NOTE An external capacitor (COUT = 1F) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6 is used for regulator stability. Figure 1 : Block Diagram
s s s s s
VERY GOOD TRANSIENT BEHAVIOUR : 1mV OUTPUT CURRENT : 200mA HIGH PSRR : 65dB NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION
IN
?
? OUT
PWRDWN STDBY
? ? VREF
TYPICAL APPLICATIONS - Cellular and Cordless phones supplied by 1 cell Lithium-ion battery / 3 cells Ni-MH or Ni-Cd battery - PDA (Personal Digital Assistant), - Smart phone - Portable equipment - Supply for RF devices for cellular phone Figure 2 : Typical Application Circuit IN
LDO_514
VIN
?
?
OUT
VOUT
Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode
PWRDWN
1F
? LDO_514
ESR COUT
STDBY
? ? GND
June 2002
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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LDO_514
ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -55C < TA < +125C, COUT = 1F 20%, 20m < ESR < 0.6, ILOAD = 200mA. Typical case : VIN = 4V, T = 25C, COUT = 1F.
Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current Dropout Voltage IOUT VDO VOUT = 50mV, ILOAD = 200mA (Note 2) Quiescent current IQ ILOAD = 100A ILOAD = 20mA ILOAD = 200mA Power down mode quiescent current Power Supply Rejection Ratio IQPDM PSRR Power down active DC f = 10KHz f = 100KHz Line Regulation Load Regulation Line Transient Load Transient Output Noise Voltage LIR LDR LIRT LDTR en ILOAD = 200mA, VIN = 3V to 5.5V ILOAD = 100A - 200mA VIN = 300mV tRISE = tFALL = 10s ILOAD = 100A - 200mA in 10s 100Hz 1KHz 10KHz enRMS Output decoupling Capacitor Settling time Short Circuit Current Limit ISHORT COUT ILOAD = 200mA BW : 100Hz to 100KHz 0.5 1400 450 150 45 1 15 800 30 nV ----------Hz VRMS F s mA 1 mV 35 <1 40 mV mV 170 70 90 320 100 65 60 50 1.5 2.5 mV 110 130 440 nA dB A Symbol VIN VOUT Test Condition Min. 3 2.8 3 200 50 Typ. Max. 5.5 Unit V V % mA mV
Notes: 1. Above characteristics are given for 3V minimum input operating range voltage, but regulator is operational with 2.7V minimum input voltage. 2. All parameters are guaranteed with 170mV min Dropout voltage.
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LDO_514
ELECTRICAL CHARACTERISTICS : STAND-BY MODE 3V < VIN < 5.5V, -30C < TA < +85C, VREF = 2.8V, COUT = 4.7F 20%, 20m < ESR < 0.6. ILOAD = 500A. Typical case : VIN = 4V, Ambient temperature, ILOAD = 500A.
Parameter Output current in stand-by mode Symbol IOUTSTDBY ILOAD = 500A f = 10KHz VIN = 3V to 5.5V ILOAD = 100A - 500A 15 55 2 1 Test Condition Min. Typ. Max. 200 20 dB mV mV Unit A
Quiescent Current in stand-by mode ISTDBY Power Supply Rejection Ratio in stand-by mode Line Regulation in stand-by mode Load Regulation in stand-by mode PSRRSTY Lir STBY Ldr STBY
TYPICAL CHARACTERISTICS Figure 3 : PSRR vs Freq for Various Voltage Drop (VOUT = 2.8V, Full Load)
-15
Figure 4 : Output Voltage vs. Input Voltage (VOUT = 2.8V, Full Load)
2805
-25
PSRR (dB)
-35
OUTPUT VOLTAGE (mV)
2803
2801
-45
150m V
Full Load
2799
-55
170m V 200m V 2V
2797
-65 1 10 100 1000 10000 100000 1000000 10000000
2795 3.00 3.20 3.40 3.50 3.80 4.00 4.50 5 5.1
FREQUENCY (Hz)
INPUT VOLTAGE (V)
Figure 5 : Output Voltage vs Output Current (Load Regulation)
2750
OUTPUT VOLTAGE (mV)
2740
2730
Vin=3.0V Vin=4.0V
2720
Vin=5.5V
2710
10 60 110 160 210
OUTPUT CURRENT (mA)
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LDO_514
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States http://www.st.com
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