LDO_512 IP Library: Ultra Low Noise, High PSRR, Low Power, 30mA Very Low Dropout Voltage Regulators PRODUCT PREVIEW ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ RF REGULATOR VERY LOW DROPOUT VOLTAGE : 30mV ULTRA LOW OUTPUT VOLTAGE NOISE HIGH PSRR : 70dB LOW STAND-BY CURRENT : 20µA LOW QUIESCENT CURRENT : 150µA FULL LOAD NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION SMALL DECOUPLING CERAMIC CAPACITOR BIPOLAR INPUT STAGE 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 TYPICAL APPLICATIONS – Cellular and Cordless phones supplied by 1 cell Lithium-ion battery / 3 cells Ni-MH or Ni-Cd battery – PDA (Personal Digital Assistant) – Smart phone – Portable equipment – Supply for RF devices for cellular phone IN ? PWRDWN ? STDBY ? ? OUT VREF LDO_512 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_512 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. 1/6 LDO_512 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, 0.8µF < COUT < 1.2µF, 20mΩ < ESR < 0.6Ω. 100µA < ILOAD < 30mA. Typical case : VIN = 4V, T = 25°C, IOUT = 15mA. Parameter Input Voltage Range (Note 1) Symbol Test Condition Min. Typ. 3 V IN Max. Unit 5.5 V 2.8 V Output Voltage VOUT Output current IOUT 30 mA PMOS Output Resistance RON 0.4 Ω 600 nA 30 mV µA Input Current Dropout Voltage IIN ∆VDO 200 ILOAD = 30mA, ∆VOUT = 50mV (Note 2) Quiescent current Stand-by current Power down mode quiescent current Power Supply Rejection Ratio Power Supply Rejection Ratio in stand-by mode IQ ISTDBY I PDN PSRR 170 ILOAD = 100µA 100 150 ILOAD = 30mA 150 280 ILOAD = 100µA 20 30 Power down active 0.1 µA µA f < 100KHz 55 70 dB PSRRSTY f < 100kHz 60 65 dB Load Regulation LDR Line Regulation L IR ILOAD = 30mA, 10 12 mV 0.5 1 mV 0.5 1.5 mV 3 mV µs VIN = 3V to 5.1V, VOUT = 2.8V Line Transcient LIRT VOUT = 2.8V, IOUT = 30mA, ∆VIN = 300mV tRISE = tFALL = 10µs Load Transcient LDTR VOUT = 2.8V, tRISE = tFALL = 10µs 100µA < ILOAD < 30mA Output Voltage Noise Output Decoupling Capacitor en 10 20 100Hz < f ≤ 1KHz 30 70 1KHz < f ≤ 100KHz 20 35 f > 100KHz 20 30 1 C OUT VOUT = 2.8V, COUT = 1µF Settling Time (from power down to active mode) Short Circuit Current Limit Recovery time ISHORT 20 nV -----------Hz µF 50 µs 200 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 Dropout voltage. 2/6 LDO_512 TYPICAL CHARACTERISTICS Figure 3 : PSRR vs Frequency (Iload max - Vin min) Figure 4 : Noise vs Frequency (Iload max - Vin min) 150 75 PSRR (dB) NOISE (nVrms) 70 50 65 60 100 100 1000 10000 FREQUENCY (Hz) 100000 0 100 1000 10000 100000 FREQUENCY (Hz) Figure 5 : Load Transient (rising egde) Figure 6 : Load Transient (falling egde) Figure 7 : Load Transient in Std-by mode (rising egde) Figure 8 : Load Transient in Std-by mode (falling egde) 3/6 LDO_512 Figure 9 : Output Voltage vs Input Voltage (Line Regulation) Figure 10 : Output Voltage vs Input Voltage (Line Regulation - Stand-by mode) 2810 2813 OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (mV) no load 2805 no load 2800 Iload=15mA Iload=30mA 2795 2790 2812 Iload=100µA 2811 2810 3.0 3.5 4.0 4.5 5.1 3.0 3.5 INPUT VOLTAGE (V) 4.0 4.5 5.1 INPUT VOLTAGE (V) Figure 11 : Line Transient (rising egde ; Vin min ; Iload max) Figure 12 : Line Transient (falling egde ; Vin min ; Iload max) Figure 13 : Output Voltage vs Output Current (Load Regulation) Figure 14 : Output Voltage vs Output Current (Load Regulation - Stand-by mode) 2813 OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (mV) 2805 2800 Vin=5.1V 2795 2812 Vin=5.1V 2811 Vin=3.0V Vin=3.0V 2790 0 10 20 OUTPUT CURRENT (mA) 4/6 30 2810 0 20 40 60 OUTPUT CURRENT (µA) 80 100 LDO_512 5/6 LDO_512 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. 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