LDOC_516 IP Library: High PSRR, Low Power, 100mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ ■ ■ ■ ■ ■ ■ ■ ■ 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. CMOS REGULATOR VERY LOW DROPOUT VOLTAGE : 50mV LOW CONSUMPTION : 170µA FULL LOAD LOW NOISE : 200µV Figure 1 : Block Diagram HIGH PSRR : 55dB OUTPUT CURRENT : 100mA SMALL OUTPUT DECOUPLING CAPACITOR IN ? PWRDWN ? STDBY ? ? OUT NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION 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 LDOC_516 – Supply for RF devices for cellular phone Figure 2 : Typical Application Circuit IN VIN Power Down Mode ON OFF PWRDWN ? Stand-by Mode → → Active Mode OUT VOUT 1µF ? → → Stand-by Mode ? COUT LDOC_516 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 LDOC_516 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -55°C < TA < +125°C, COUT = 1µF ±20%, 20mΩ < ESR < 0.6Ω, ILOAD = 100mA. Typical case : VIN = 4V, T = 25°C, COUT = 1µF. Parameter Input Voltage Range (Note 1) Output Voltage Symbol Test Condition V IN Min. 3 VOUT Output Voltage Accuracy Output current IOUT Dropout Voltage ∆VDO IQ 5.5 V 3 % 100 mA 50 mV µA 200 ILOAD = 100µA 45 65 ILOAD = 100mA 600 750 100 nA dB IQPDM Power down active Power Supply Rejection Ratio PSRR DC ; Dropout = 200mV 40 55 f = 10KHz 40 55 f = 100KHz 35 45 LIR Unit V Power down mode quiescent current Line Regulation Max. 2.8 ∆VOUT = 50mV, ILOAD = 100mA (Note 2) Quiescent current Typ. ILOAD = 100mA, 3.5 6.5 mV 20 25 mV 1 mV VIN = 3V to 5.5V Load Regulation LDR ILOAD = 100µA - 100mA Line Transient LIRT ∆VIN = 300mV tRISE = tFALL = 5µs Load Transient Output Noise Voltage LDTR en enRMS Output decoupling Capacitor 2 mV 100Hz 1.2 µV -----------Hz 1KHz 400 10KHz 200 nV -----------Hz BW : 100Hz to 100KHz 60 µVRMS 1 µF COUT Settling time Short Circuit Current Limit ILOAD = 100µA - 100mA in 5µs ILOAD = 100mA ISHORT 15 40 µs 400 700 mA 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 200mV min Dropout voltage. 2/4 LDOC_516 3/4 LDOC_516 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