LDO_514 IP Library: High PSRR, Very Low power, 200mA Low Dropout Voltage Regulator PRODUCT PREVIEW ■ RF REGULATOR ■ VERY LOW DROPOUT VOLTAGE : 50mV ■ VERY LOW CONSUMPTION : 320µA FULL LOAD ■ ■ ■ ■ ■ VERY GOOD TRANSIENT BEHAVIOUR : 1mV 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. Figure 1 : Block Diagram OUTPUT CURRENT : 200mA 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_514 – 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_514 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_514 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -55°C < TA < +125°C, COUT = 1µF ±20%, 20mΩ < ESR < 0.6Ω, ILOAD = 200mA. Typical case : VIN = 4V, T = 25°C, COUT = 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, 200 mA 50 mV µA ILOAD = 200mA (Note 2) Quiescent current IQ 170 ILOAD = 100µA 70 110 ILOAD = 20mA 90 130 ILOAD = 200mA 320 440 Power down mode quiescent current IQPDM Power down active 100 nA Power Supply Rejection Ratio PSRR DC 65 dB f = 10KHz 60 f = 100KHz 50 ILOAD = 200mA, 1.5 2.5 mV ILOAD = 100µA - 200mA 35 40 mV ∆VIN = 300mV <1 Line Regulation LIR VIN = 3V to 5.5V Load Regulation LDR Line Transient LIRT mV tRISE = tFALL = 10µs Load Transient Output Noise Voltage LDTR en enRMS Output decoupling Capacitor 0.5 1 mV 100Hz 1400 1KHz 450 10KHz 150 BW : 100Hz to 100KHz 45 µVRMS 1 µF COUT ILOAD = 200mA Settling time Short Circuit Current Limit ILOAD = 100µA - 200mA in 10µs ISHORT 15 800 nV -----------Hz 30 µs 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 170mV min Dropout voltage. 2/4 LDO_514 ELECTRICAL CHARACTERISTICS : STAND-BY MODE 3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, COUT = 4.7µF ±20%, 20mΩ < ESR < 0.6Ω. ILOAD = 500µA. Typical case : VIN = 4V, Ambient temperature, ILOAD = 500µA. Parameter Symbol Output current in stand-by mode Test Condition Min. Typ. IOUTSTDBY Max. Unit 200 µA Quiescent Current in stand-by mode ISTDBY ILOAD = 500µA 15 Power Supply Rejection Ratio in stand-by mode PSRRSTY f = 10KHz 55 dB Line Regulation in stand-by mode Lir STBY VIN = 3V to 5.5V 2 mV Load Regulation in stand-by mode Ldr STBY ILOAD = 100µA - 500µA 1 mV 20 TYPICAL CHARACTERISTICS Figure 3 : PSRR vs Freq for Various Voltage Drop (VOUT = 2.8V, Full Load) Figure 4 : Output Voltage vs. Input Voltage (VOUT = 2.8V, Full Load) -15 2805 OUTPUT VOLTAGE (mV) PSRR (dB) -25 -35 -45 150m V 170m V -55 2803 2801 Full Load 2799 2797 200m V 2V -65 1 100 10 10000 2795 1000000 1000 100000 3.00 10000000 3.20 3.40 3.50 3.80 4.00 4.50 5 5.1 INPUT VOLTAGE (V) FREQUENCY (Hz) Figure 5 : Output Voltage vs Output Current (Load Regulation) OUTPUT VOLTAGE (mV) 2750 2740 2730 Vin=3.0V Vin=4.0V 2720 Vin=5.5V 2710 10 60 110 160 210 OUTPUT CURRENT (mA) 3/4 LDO_514 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