LDO_58 IP Library: Ultra Low Noise, Low power, 100mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ RF REGULATOR ■ ULTRA LOW OUTPUT NOISE 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. ■ HIGH OUTPUT CURRENT : 100mA Figure 1 : Block Diagram ■ VERY LOW DROPOUT VOLTAGE : 50mV ■ LOW QUIESCENT CURRENT : 110µA ■ HIGH PSRR : 65dB 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. LDO_58 – 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 LDO_58 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_58 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, C OUT = 1µF ±20%, 20mΩ < ESR < 0.6Ω, ILOAD = 100mA. Typical case : VIN = 4V, T = 25°C, C OUT = 1µF. Parameter Input Voltage Range (Note 1) Output Voltage Symbol Test Condition VIN Min 3 VOUT Output Voltage Accuracy Output current IOUT Dropout Voltage ∆VDO Typ Max Unit 5,5 V 2,8 V 3 % ∆VOUT = 50mV, 100 mA 50 mV µA ILOAD = 100mA (Note 2) Quiescent current IQ 170 ILOAD = 100µA 50 70 ILOAD = 100mA 110 250 40 Quiescent Current in stand-by mode ISTDBY ILOAD = 100µA 20 Power down mode quiescent current IQPDM Power down active 100 nA Power Supply Rejection Ratio PSRR DC 45 65 dB f = 10KHz 45 60 f = 100KHz 35 45 Line Regulation Lir I LOAD = 100mA, 0,5 1 mV VIN = 3V to 5.5V Load Regulation Ldr I LOAD = 100µA - 100mA 25 40 mV Line Transient Lirt ∆VIN = 300mV tRISE = tFALL=10µs 0,5 1,5 mV Load Transient Ldtr I LOAD = 100µA - 100mA in 10µs 3 10 mV 100Hz 40 65 1KHz - 10KHz 30 40 nV -----------Hz BW : 10Hz to 100KHz 25 30 µVRMS Output Noise Voltage en enRMS Output decoupling Capacitor COUT Settling time Short Circuit Current Limit From power down to active mode ISHORT µF 1 20 50 µs 200 mA 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 parameters are guaranteed with 170mV min dropout voltage. 2/4 LDO_58 TYPCIAL CHARACTERISTICS Figure 7 : PSRR vs Frequency for Various Voltage Drop (ILOAD = 100mA) -35 PSRR (dB) -45 150m V 170m V -55 200m V 2V -65 1 10 100 1000 10000 100000 1000000 FREQUENCY (Hz) 3/4 LDO_58 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