LDO57 Datasheet, PDF (1/4 Pages) STMicroelectronics – IP Library: High Output Current, Low power, 400mA Low Dropout Voltage Regulator

LDO_57
IP Library: High Output Current, Low power,
400mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s DIGITAL BASEBAND REGULATOR
s VERY LOW DROPOUT VOLTAGE : 50mV
s HIGH OUTPUT CURRENT : 400mA
s LOW QUIESCENT CURRENT : 100µA
s HIGH PSRR : 60dB
s LOW OUTPUT VOLTAGE NOISE
s NO CURRENT IN POWER DOWN MODE
s SHORT CIRCUIT PROTECTION
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 Baseband devices for cellular
phone.
Figure 2 : Typical Application Circuit
APPLICATION NOTE
An external capacitor (C_OUT = 4.7µF) with an
equivalent serial resistance (ESR) in the range
0.02 to 0.6Ω is used for regulator stability.
Figure 1 : Block Diagram
IN ?
PWRDWN ?
STDBY ?
V_REF
? OUT
LDO_57
V_IN
IN
?
OUT
?
V_OUT
Power Down Mode
ON
→
OFF
→
Stand-by Mode
Stand-by Mode →
Active Mode →
PWRDWN
?
STDBY
?
LDO_57
GND
?
4.7µF
C_OUT
ESR
June 2002
1/4
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.