LDO_55 IP Library: Very Low Power, Adjustable Output Voltage², 25mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ ANALOG BASEBAND REGULATOR ■ HIGH PSRR : 60dB APPLICATION NOTE An external capacitor (COUT = 1µF typical) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6Ω is used to ensure stability. ■ LOW QUIESCENT CURRENT Figure 1 : Block Diagram ■ VERY LOW DROPOUT VOLTAGE : 60mV ■ 20µA STD-BY MODE CURRENT ■ NO CURRENT IN POWER DOWN MODE IN ? PWRDWN ? STDBY ? ? OUT ■ SHORT CIRCUIT PROTECTION ■ SMALL DECOUPLING CERAMIC CAPACITOR 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. LDO_55 – Supply for Digital (DSP/Microcontroller) devices. Figure 2 : Typical Application Circuit IN VIN ? ? OUT VOUT COUT Power Down Mode ON OFF PWRDWN 1µF ? → → Stand-by Mode Stand-by Mode → → Active Mode LDO_55 ESR1 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. 1/2 LDO_55 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < T < +125°C, 0.8µF < COUT < 1.2µF, 20mΩ < ESR < 0.6Ω, 100µA < ILOAD < 25mA. Typical case : VIN = 4V, T = 25°C, IOUT = 12.5mA. Parameter Symbol Input Voltage Range (Note 1) Output Voltage VIN VOUT Output Voltage Accuracy Output current IOUT PMOS Output Resistance RON Dropout Voltage ∆VDO Quiescent current IQ Stand-by mode current IQSTDBY Power down mode quiescent current Power Supply Rejection Ratio Load Regulation Line Regulation Line Transient Load Transient IQPRWDWN PSRR Ldr Lir Lirt Ldtr Output decoupling capacitor Settling time (from power down to active mode) COUT tRISE tFALL Short Circuit Current Limit Test Condition Min Typ 3 Adj = 0 Adj = 1 Active mode Sleep mode ∆VOUT = 50mV, ILOAD = 25mA (Note 2) ILOAD = 100µA, ILOAD = 25mA ILOAD = 500µA VOUT = 3V Power down active f < 10KHz Unit 5,5 V V 1,8 3 3 25 500 0,6 % mA µA Ω 60 mV 30 60 20 40 80 30 µA µA µA 100 50 15 5 1 000 25 10 1 nA dB mV mV mV 1 mV 1 30 70 µF µs 60 200 µs 200 250 mA 0,1 5 170 40 ILOAD = 25mA ∆VIN = 300mV tRISE = tFALL = 10µs 10% to 90% and 90% to 10% of 25mA in 10µs From power down to active mode From active mode to power down ISHORT Max 100 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. 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 2/2