View LDO55_225126.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LDO_55
IP Library: Very Low Power, Adjustable Output Voltage, 25mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s ANALOG BASEBAND REGULATOR s VERY LOW DROPOUT VOLTAGE : 60mV s HIGH PSRR : 60dB s LOW QUIESCENT CURRENT s 20A STD-BY MODE CURRENT 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 IN
APPLICATION NOTE An external capacitor (COUT = 1F typical) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6 is used to ensure stability. Figure 1 : Block Diagram
IN
?
? OUT
PWRDWN STDBY
? ? VREF
LDO_55
VIN
?
?
OUT
VOUT COUT
Power Down Mode ON OFF Stand-by Mode Stand-by Mode Active Mode
PWRDWN
1F
? LDO_55
ESR1
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.
1/2
LDO_55
ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30C < T < +125C, 0.8F < COUT < 1.2F, 20m < ESR < 0.6, 100A < ILOAD < 25mA. Typical case : VIN = 4V, T = 25C, IOUT = 12.5mA.
Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current PMOS Output Resistance Dropout Voltage Symbol VIN VOUT Test Condition Adj = 0 Adj = 1 Active mode Sleep mode VOUT = 50mV, ILOAD = 25mA (Note 2) ILOAD = 100A, ILOAD = 25mA ILOAD = 500A VOUT = 3V Power down active f < 10KHz ILOAD = 25mA VIN = 300mV tRISE = tFALL = 10s 10% to 90% and 90% to 10% of 25mA in 10s From power down to active mode From active mode to power down 100 0,1 5 Min 3 1,8 3 3 25 500 0,6 60 170 30 60 20 100 50 15 5 40 80 30 1 000 25 10 1 1 A A A nA dB mV mV mV mV F s s mA Typ Max 5,5 Unit V V % mA A mV
IOUT RON VDO
Quiescent current Stand-by mode current Power down mode quiescent current Power Supply Rejection Ratio Load Regulation Line Regulation Line Transient Load Transient
IQ IQSTDBY IQPRWDWN PSRR Ldr Lir Lirt Ldtr
40
Output decoupling capacitor Settling time (from power down to active mode)
COUT tRISE tFALL
1 30 60 200
70 200 250
Short Circuit Current Limit
ISHORT
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.
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
2/2

▲Up To Search▲

Price & Availability of LDO55

	To Download LDO55 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .