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LDO_58
IP Library: Ultra Low Noise, Low power, 100mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s RF REGULATOR s VERY LOW DROPOUT VOLTAGE : 50mV s ULTRA LOW OUTPUT NOISE s HIGH OUTPUT CURRENT : 100mA s LOW QUIESCENT CURRENT : 110A s HIGH PSRR : 65dB s NO CURRENT IN POWER DOWN MODE s SHORT CIRCUIT PROTECTION
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
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
IN
?
? OUT
PWRDWN STDBY
? ? VREF
LDO_58
VIN
?
?
OUT
VOUT
Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode
PWRDWN
1F
? LDO_58
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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ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30C < TA < +85C, VREF = 2.8V, C OUT = 1F 20%, 20m < ESR < 0.6, ILOAD = 100mA. Typical case : VIN = 4V, T = 25C, C OUT = 1F.
Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current Dropout Voltage IOUT VDO VOUT = 50mV, ILOAD = 100mA (Note 2) Quiescent current IQ ILOAD = 100A ILOAD = 100mA Quiescent Current in stand-by mode Power down mode quiescent current Power Supply Rejection Ratio ISTDBY IQPDM PSRR ILOAD = 100A Power down active DC f = 10KHz f = 100KHz Line Regulation Load Regulation Line Transient Load Transient Output Noise Voltage Lir Ldr Lirt Ldtr en I LOAD = 100mA, VIN = 3V to 5.5V I LOAD = 100A - 100mA VIN = 300mV tRISE = tFALL=10s I LOAD = 100A - 100mA in 10s 100Hz 1KHz - 10KHz enRMS Output decoupling Capacitor Settling time Short Circuit Current Limit ISHORT COUT From power down to active mode BW : 10Hz to 100KHz 25 0,5 3 40 30 25 1 20 50 200 40 1,5 10 65 40 30 mV mV mV nV ----------Hz VRMS F s mA 45 45 35 170 50 110 20 100 65 60 45 0,5 1 mV 70 250 40 nA dB A Symbol VIN VOUT Test Condition Min 3 2,8 3 100 50 Typ Max 5,5 Unit V V % mA mV
Notes: 1. Above characteristics are given for 2.9V 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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TYPCIAL CHARACTERISTICS Figure 7 : PSRR vs Frequency for Various Voltage Drop (ILOAD = 100mA)
-35
-45
PSRR (dB)
150m V
-55
170m V 200m V
2V
-65 1 10 100 1000 10000 100000 1000000
FREQUENCY (Hz)
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LDO_58
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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