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| LDO_52 IP Library: High PSRR, Low Power, 70mA Low Dropout Voltage Regulator PRODUCT PREVIEW s DIGITAL BASEBAND REGULATOR s VERY LOW DROPOUT VOLTAGE : 50mV s HIGH PSRR : 60dB s LOW QUIESCENT CURRENT : 150A s 1A STAND-BY MODE CURRENT s NO CURRENT IN POWER DOWN MODE s SHORT CIRCUIT PROTECTION s SMALL DECOUPLING CERAMIC CAPACITOR 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 Digital (Memory, DSP/Microcontroller) devices. Figure 2 : Typical Application Circuit IN APPLICATION NOTE An external capacitor (COUT = 1F typical) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6 is used to ensure stability. Figure 1 : Block Diagram IN ? ? OUT PWRDWN STDBY ? ? VREF LDO_52 VIN ? ? OUT VOUT Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode PWRDWN 1F ? LDO_52 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_52 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30C < T < +125C, VREF = 2.8V, 0.8F < COUT < 1.2F, 20m < ESR < 0.6. 100A < ILOAD < 70mA. Typical case : VIN = 4V, T = 25C, IOUT = 35mA. Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current IOUT Active mode Low power mode PMOS Output Resistance Dropout Voltage RON VDO VOUT = 50mV, ILOAD = 70mA (Note 2) Quiescent current IQ ILOAD = 100A ILOAD = 70mA Stand-by current Power down mode quiescent current Power Supply Rejection Ratio ISTDBY IQPRWDWN PSRR ILOAD = 500A Power down active DC f < 10KHz Load Regulation Line Regulation Ldr Lir VOUT = 2.8V ILOAD = 70mA, VOUT = 2.8V Std-by mode ILOAD = 500A Line Transient Lirt VOUT = 2.8V ILOAD = 70mA, VIN = 300mV, tRISE = tFALL = 10s Load Transient Ldtr 10% to 90% and 90% to 10% of 70mA in 10s Recovery time Output decoupling capacitor Settling time (from power down to active mode) Short Circuit Current Limit ISHORT C OUT VOUT = 2.8V, COUT = 1F 300 800 mA 5 1 20 50 5 mV 3 mV 10 mV 50 40 170 20 150 5 100 60 45 20 2 35 3 mV mV 30 170 10 1000 A nA dB A Symbol VIN VOUT -3 Test Condition Min 3 2,8 3 70 500 0,2 60 Typ Max 5,5 Unit V V % mA A mV 6 s F s 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 Dropout voltage. 2/4 LDO_52 TYPICAL CHARACTERISTICS Figure 3 : Line transient (ILOAD = 35mA ; VBAT = 4V + 300mV with 10s) Figure 4 : Line transient (ILOAD = 35mA ; VBAT = 4V + 300mV with 10s) Figure 5 : Load transient (ILOAD = 0 to 70mA ; VBAT = 4V) Figure 6 : Load transient (ILOAD = 0 to 70mA ; VBAT = 4V) Figure 7 : Settling Time 3/4 LDO_52 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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