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| LDO_512 IP Library: Ultra Low Noise, High PSRR, Low Power, 30mA Very Low Dropout Voltage Regulators PRODUCT PREVIEW s s s s s s s s s s RF REGULATOR VERY LOW DROPOUT VOLTAGE : 30mV ULTRA LOW OUTPUT VOLTAGE NOISE HIGH PSRR : 70dB LOW STAND-BY CURRENT : 20A LOW QUIESCENT CURRENT : 150A FULL LOAD NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION SMALL DECOUPLING CERAMIC CAPACITOR BIPOLAR INPUT STAGE APPLICATION NOTE An external capacitor (COUT = 1F) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6 is used for regulator stability. Figure 1 : Block Diagram IN ? ? OUT PWRDWN STDBY ? ? VREF 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 Figure 2 : Typical Application Circuit IN LDO_512 VIN ? ? OUT VOUT Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode PWRDWN 1F ? LDO_512 ESR COUT 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, -30C < TA < +85C, VREF = 2.8V, 0.8F < COUT < 1.2F, 20m < ESR < 0.6. 100A < ILOAD < 30mA. Typical case : VIN = 4V, T = 25C, IOUT = 15mA. Parameter Input Voltage Range (Note 1) Output Voltage Output current PMOS Output Resistance Input Current Dropout Voltage Symbol V IN VOUT IOUT RON IIN VDO ILOAD = 30mA, VOUT = 50mV (Note 2) Quiescent current IQ ISTDBY I PDN PSRR ILOAD = 100A ILOAD = 30mA Stand-by current Power down mode quiescent current Power Supply Rejection Ratio Power Supply Rejection Ratio in stand-by mode Load Regulation Line Regulation ILOAD = 100A Power down active f < 100KHz 55 60 170 100 150 20 0.1 70 65 10 ILOAD = 30mA, VIN = 3V to 5.1V, VOUT = 2.8V Line Transcient LIRT VOUT = 2.8V, IOUT = 30mA, VIN = 300mV tRISE = tFALL = 10s Load Transcient LDTR VOUT = 2.8V, tRISE = tFALL = 10s 100A < ILOAD < 30mA Recovery time Output Voltage Noise en 100Hz < f 1KHz 1KHz < f 100KHz f > 100KHz Output Decoupling Capacitor Settling Time (from power down to active mode) Short Circuit Current Limit ISHORT C OUT VOUT = 2.8V, COUT = 1F 10 30 20 20 1 20 50 200 20 70 35 30 F s mA s nV ----------Hz 3 mV 0.5 1.5 mV 0.5 12 1 150 280 30 A A dB dB mV mV A 200 Test Condition Min. 3 2.8 30 0.4 600 30 Typ. Max. 5.5 Unit V V mA nA mV PSRRSTY f < 100kHz LDR L IR 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) 75 Figure 4 : Noise vs Frequency (Iload max - Vin min) 150 NOISE (nVrms) 70 100 PSRR (dB) 65 50 60 100 1000 10000 100000 0 100 1000 10000 100000 FREQUENCY (Hz) 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) 2810 Figure 10 : Output Voltage vs Input Voltage (Line Regulation - Stand-by mode) 2813 no load OUTPUT VOLTAGE (mV) 2805 no load OUTPUT VOLTAGE (mV) 2812 Iload=100A 2800 Iload=15mA 2811 2795 Iload=30mA 2790 3.0 3.5 4.0 4.5 5.1 2810 3.0 3.5 4.0 4.5 5.1 INPUT VOLTAGE (V) 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) 2805 Figure 14 : Output Voltage vs Output Current (Load Regulation - Stand-by mode) 2813 OUTPUT VOLTAGE (mV) 2800 OUTPUT VOLTAGE (mV) 2812 Vin=5.1V Vin=5.1V 2795 2811 Vin=3.0V Vin=3.0V 2790 0 10 20 30 2810 0 20 40 60 80 100 OUTPUT CURRENT (mA) OUTPUT CURRENT (A) 4/6 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. The ST logo is a registered trademark of STMicroelectronics (c) 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 6/6 |
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