LDO55 Datasheet, PDF (1/2 Pages) STMicroelectronics – IP Library: Very Low Power, Adjustable Output Voltage², 25mA Low Dropout Voltage Regulator

LDO_55
IP Library: Very Low Power, Adjustable Output Voltage²,
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 20µA 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
APPLICATION NOTE
An external capacitor (C_OUT = 1µF typical) with an
equivalent serial resistance (ESR) in the range
0.02 to 0.6Ω is used to ensure stability.
Figure 1 : Block Diagram
IN ?
PWRDWN ?
STDBY ?
V_REF
? OUT
LDO_55
V_IN
Power Down Mode
ON
→
OFF
→
Stand-by Mode
Stand-by Mode →
Active Mode →
IN
?
PWRDWN
?
STDBY
?
OUT
?
LDO_55
GND
?
V_OUT
C_OUT
1µF
ESR1
June 2002
1/2
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.