LDO_57 IP Library: High Output Current, Low power, 400mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ DIGITAL BASEBAND REGULATOR ■ VERY LOW DROPOUT VOLTAGE : 50mV APPLICATION NOTE An external capacitor (COUT = 4.7µF) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6Ω is used for regulator stability. ■ HIGH OUTPUT CURRENT : 400mA ■ LOW QUIESCENT CURRENT : 100µA Figure 1 : Block Diagram ■ HIGH PSRR : 60dB ■ LOW OUTPUT VOLTAGE NOISE ■ NO CURRENT IN POWER DOWN MODE ■ SHORT CIRCUIT PROTECTION IN ? PWRDWN ? STDBY ? ? OUT TYPICAL APPLICATIONS – Cellular and Cordless phones supplied by 1 cell Lithium-ion battery / 3 cells Ni-MH or Ni-Cd battery. VREF – PDA (Personal Digital Assistant), Smart phone. – Portable equipment. – Supply for Digital Baseband devices for cellular phone. LDO_57 Figure 2 : Typical Application Circuit IN VIN Power Down Mode ON OFF PWRDWN ? Stand-by Mode → → Active Mode OUT VOUT 4.7µF ? → → Stand-by Mode ? COUT LDO_57 ESR 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_57 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, COUT = 4.7µF ±20%, 20mΩ < ESR < 0.6Ω, ILOAD = 400mA. Typical case : VIN = 4V, T = 25°C, C OUT = 4.7µF, ILOAD = 400mA. Parameter Input Voltage Range (Note 1) Output Voltage Symbol Test Condition Min 5,5 V VOUT 1,8 4,9 V 3 IOUT Dropout Voltage ∆VDO ∆VOUT = 50mV, ILOAD = 400mA, (Note 2) IQ µA ILOAD = 40mA 150 230 ILOAD = 400mA 350 450 100 nA dB DC 40 60 f = 10KHz 40 55 Line Regulation Lir ILOAD = 400mA, VIN = 2.9V to 5.5V Load Regulation Ldr ILOAD = 100µA - 400mA Line Transient Lirt ∆VIN = 300mV tRISE = tFALL = 10µs Load Transient Ldtr ILOAD = 100µA - 400mA in 10µs 4 mV 50 55 mV 2,5 5 mV 3 5 mV 100Hz 1,2 µV -----------Hz 1KHz 400 10KHz 140 nV -----------Hz BW : 100Hz to 100KHz 35 µVRMS COUT µF 4,7 From power down to active mode ISHORT mV 150 PSRR Short Circuit Current Limit 50 100 Power Supply Rejection Ratio Settling time mA ILOAD = 100µA Power down active enRMS 400 mV IQPDM en % 170 Power down mode quiescent current Output decoupling Capacitor Unit 2,9 Output current Output Noise Voltage Max VIN Output Voltage Accuracy Quiescent current Typ 50 µs 2 A 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 performances of the regulator are guarenteed for a voltage drop of 170mV minimum. 2/4 LDO_57 ELECTRICAL CHARACTERISTICS : (Stand-by mode) 3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, COUT = 4.7µF ±20%, 20mΩ < ESR < 0.6Ω, ILOAD = 500µA. Typical case : VIN = 4V, Ambient temperature, ILOAD = 500µA. Parameter Symbol Test Condition Output current in stand-by mode IOUTSTDBY Quiescent Current in stand-by mode ISTDBY ILOAD = 500µA Power Supply Rejection Ratio in stand-by mode PSRRSTY f = 10KHz Line Regulation in stand-by mode LirSTDBY ILOAD = 500µA, Min Typ 20 35 Max Unit 500 µA 30 45 dB 2 6 mV 50 55 mV VIN = 2.9V to 5.5V Load Regulation Ldr STDBY ILOAD = 100µA - 500µA TYPCIAL CHARACTERISTICS Figure 7 : PSRR vs Frequency for Various Voltage Drop -20 PSRR (dB) -30 -40 150m V -50 170m V 200m V -60 2V -70 1 10 100 1000 10000 100000 1000000 FREQUENCY (Hz) 3/4 LDO_57 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 © 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