LDO_53 IP Library: High PSRR, Very Low Power, 40mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ DIGITAL BASEBAND REGULATOR ■ HIGH PSRR : 55dB APPLICATION NOTE An external capacitor (COUT = 1µF) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6Ω is used for regulator stability. ■ VERY LOW QUIESCENT CURRENT : 100µA Figure 1 : Block Diagram ■ VERY LOW DROPOUT VOLTAGE : 50mV FULL LOAD ■ NO CURRENT IN POWER DOWN MODE IN ? PWRDWN ? ■ SHORT CIRCUIT PROTECTION ? OUT ■ 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_53 – Supply for Digital (DSP/Microcontroller) devices. Figure 2 : Typical Application Circuit VIN Power Down Mode IN PWRDWN ? ? OUT VOUT 1µF ? COUT LDO_53 ON ESR OFF ? 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_53 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < T < +85°C, VREF = 2.8V, 0.8µF < COUT < 1.2µF, 20mΩ < ESR < 0.6Ω. 100µA < ILOAD < 40mA. Typical case : VIN = 4V, T = 25°C, IOUT = 20mA. Parameter Input Voltage Range (Note 1) Output Voltage Symbol Test Condition V IN IOUT PMOS Output Resistance RON Dropout Voltage ∆VDO 40 mA 0,4 Ω 50 mV µA 170 ILOAD = 100µA 20 30 ILOAD = 40mA 100 120 Power Supply Rejection Ratio PSRR DC 50 55 f < 10KHz 45 50 Lir V 0,1 Power down active Line Regulation V % IQPDN Ldr 5,5 3 Power down mode quiescent current Load Regulation Unit -3 ∆VOUT = 50mV, ILOAD = 40mA (Note 2) IQ Max 2,8 VOUT Output current Typ 3 Output Voltage Accuracy Quiescent current Min ILOAD = 40mA, 1 µA dB 15 25 mV 2 3 mV 3 mV 3 mV 6 µs VIN = 3V to 5.1V, VOUT = 2.8V Line Transcient Lirt VOUT = 2.8V, IOUT = 40mA, ∆VIN = 300mV tRISE = tFALL = 10µs Load Transcient Ldtr VOUT = 2.8V, tRISE = tFALL = 10µs 100µA < ILOAD < 40mA Recovery time Output decoupling capacitor µF 1 COUT Settling time 5 VOUT = 2.8V, COUT = 1µF 20 50 µs 200 mA (from power down to active mode) Short Circuit Current Limit ISHORT 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_53 TYPICAL CHARACTERISTICS Figure 3 : Quiescent Current vs Output Current (IL = 0 to 40mA - VIN = 4V) Figure 4 : Settling time (VIN = 4V ; ILOAD = 20mA) CURRENT COMSUMPTION (µA) 100 80 60 40 20 0 10 20 30 OUTPUT LOAD (mA) 40 Figure 5 : Line Transient - rising edge (VIN = 4V + 300mV with 10µs) Figure 6 : Line Transient - falling edge (VIN = 4V + 300mV with 10µs) Figure 7 : Load Transient - rising edge (IL = 0 to 40 mA - VIN = 4V) Figure 8 : Load Transient - falling edge (IL = 40 to 0 mA - VIN = 4V) 3/4 LDO_53 Figure 9 : PSRR vs Frequency (ILOAD max - VINmin) 70 PSRR (dB) 60 50 40 30 100 1000 10000 100000 Frequency (Hz) 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