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| LDO_518 IP Library: Low Noise, High PSRR 100mA Low Dropout Voltage Regulator PRODUCT PREVIEW s ULTRA LOW POWER REGULATOR s ULTRA LOW CONSUMPTION : 45A FULL LOAD s s s s s s VERY LOW NOISE : 30V VERY LOW DROPOUT VOLTAGE : 50mV HIGH PSRR : 60dB SMALL DECOUPLING CERAMIC CAPACITOR NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION APPLICATION NOTE An external capacitor (COUT = 2.2F) with an equivalent serial resistance (ESR) in the range of 0.02 to 0.6 is used for regulator stability. Figure 1 : Block Diagram 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_518 VIN ? ? OUT VOUT Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode PWRDWN 2.2F ? LDO_518 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. 1/4 LDO_518 ELECTRICAL CHARACTERISTICS 2V < VIN < 5V, -55C < TA < +125C, COUT = 2.2F 20%, 20 m < ESR < 0.6, ILOAD = 100mA. Typical case : VIN = 4V, T = 25C, COUT = 2.2F. 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 = 1mA ILOAD = 10mA ILOAD = 50mA ILOAD=100mA Power down mode quiescent current Power Supply Rejection Ratio IQPDM PSRR Power down active VDO = 170mV ; f < 1KHz f < 10KHz VDO = 500mV; f < 100Hz f < 1KHz f < 10KHz Line Regulation Load Regulation Line Transient Load Transient Output Noise Voltage L IR LDR LIRT LDTR en ILOAD = 100mA, VIN = 2V to 5V ILOAD = 100A - 100mA VIN = 300mV tRISE = tFALL = 10s ILOAD = 100A - 100mA in 10s 100Hz 1KHz 10KHz enRMS Settling time BW : 100Hz to 100KHz ILOAD = 100mA 140 75 70 40 35 nV ----------Hz VRMS s 55 40 60 45 0.5 15 6 7 1 20 10 50 mV mV mV mV 45 35 60 170 25 25 30 35 45 100 50 40 65 50 nA dB A Symbol V IN VOUT Test Condition Min. 2 1.8 3 100 50 Typ. Max. 5 Unit V V % mA mV Notes: 1. Above characteristics are given for 3V minimum input operating range voltage, but regulator is operational with 2.5V minimum input voltage. 2. All parameters are guaranteed with 170mV min Dropout voltage. 2/4 LDO_518 ELECTRICAL CHARACTERISTICS 2V < VIN < 5V, -55C < TA < +125C, COUT = 2.2F 20%, 0.02 < ESR < 0.6, ILOAD = 100mA. Typical case : VIN = 4V, Ambient temperature, ILOAD = 100mA. Parameter Output decoupling Capacitor Cout equivalent serial resistor Short Circuit Current Limit Settling Time Symbol COUT ESR ISHORT tS 0.02 200 400 35 Test Condition Min. Typ. 2.2 0.6 800 60 Max. Unit F mA s TYPICAL CHARACTERISTICS Figure 3 : PSRR vs Frequency for Various Dropout (VOUT =1.8V, Full Load) -30 -40 PSRR (dB) Drop=170m V -50 -60 Drop=250m V Drop=500m V Drop=1V -70 1 10 100 1000 10000 100000 1000000 FREQUENCY (Hz) 3/4 LDO_518 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 4/4 |
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