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LDO_53
IP Library: High PSRR, Very Low Power, 40mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s DIGITAL BASEBAND REGULATOR s VERY LOW DROPOUT VOLTAGE : 50mV s HIGH PSRR : 55dB s VERY LOW QUIESCENT CURRENT : 100A
FULL LOAD
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
s NO CURRENT IN POWER DOWN MODE s SHORT CIRCUIT PROTECTION s SMALL DECOUPLING CERAMIC CAPACITOR
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 Digital (DSP/Microcontroller) devices. Figure 2 : Typical Application Circuit VIN IN
IN
?
? OUT
PWRDWN
?
VREF
LDO_53
?
?
OUT
VOUT
Power Down Mode
PWRDWN ON
1F
? LDO_53
ESR COUT
OFF ? GND
June 2002
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30C < T < +85C, VREF = 2.8V, 0.8F < COUT < 1.2F, 20m < ESR < 0.6. 100A < ILOAD < 40mA. Typical case : VIN = 4V, T = 25C, IOUT = 20mA.
Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current PMOS Output Resistance Dropout Voltage IOUT RON VDO VOUT = 50mV, ILOAD = 40mA (Note 2) Quiescent current IQ ILOAD = 100A ILOAD = 40mA Power down mode quiescent current Power Supply Rejection Ratio IQPDN PSRR Power down active DC f < 10KHz Load Regulation Line Regulation Ldr Lir ILOAD = 40mA, VIN = 3V to 5.1V, VOUT = 2.8V Line Transcient Lirt VOUT = 2.8V, IOUT = 40mA, VIN = 300mV tRISE = tFALL = 10s Load Transcient Ldtr VOUT = 2.8V, tRISE = tFALL = 10s 100A < ILOAD < 40mA Recovery time Output decoupling capacitor Settling time (from power down to active mode) Short Circuit Current Limit ISHORT 200 mA COUT VOUT = 2.8V, COUT = 1F 5 1 20 50 6 s F s 3 mV 3 mV 50 45 55 50 15 2 25 3 mV mV 170 20 100 30 120 1 A dB A Symbol V IN VOUT -3 0,1 Test Condition Min 3 2,8 3 40 0,4 50 Typ Max 5,5 Unit V V % mA mV
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.
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TYPICAL CHARACTERISTICS Figure 3 : Quiescent Current vs Output Current (IL = 0 to 40mA - VIN = 4V)
100 CURRENT COMSUMPTION (A)
Figure 4 : Settling time (VIN = 4V ; ILOAD = 20mA)
80
60
40
20
0
10
20 30 OUTPUT LOAD (mA)
40
Figure 5 : Line Transient - rising edge (VIN = 4V + 300mV with 10s)
Figure 6 : Line Transient - falling edge (VIN = 4V + 300mV with 10s)
Figure 7 : Load Transient - rising edge (IL = 0 to 40 mA - VIN = 4V)
Figure 8 : Load Transient - falling edge (IL = 40 to 0 mA - VIN = 4V)
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LDO_53
Figure 9 : PSRR vs Frequency (ILOAD max - VINmin)
70
60
PSRR (dB)
50
40
30 100
1000
10000
100000
Frequency (Hz)
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
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