SC4205 Datasheet, PDF (1/8 Pages) Semtech Corporation – Very Low Dropout 1 Amp Regulator With Enable

POWER MANAGEMENT
Description
The SC4205 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 1 Amp. Since it has
superior dropout characteristics compared to regular
LDOs, it can be used to supply 2.5V on motherboards or
2.8V on peripheral cards from the 3.3V supply thus
allowing the elimination of costly heatsinks. Additionally,
the SC4205 has an enable pin to further reduce power
dissipation while shut down. The SC4205 provides ex-
cellent regulation over variations in line, load and tem-
perature.
The SC4205 is available in the SOIC-8EDP package with
internally preset outputs that are also adjustable using
external resistors.
Typical Application Circuits
SC4205
Very Low Dropout
1 Amp Regulator With Enable
Features
‹ 350mV dropout @ 1A
‹ Adjustable output from 1.2V to 4.8V
‹ 2.5V and 1.8V options (adjustable externally
using resistors)
‹ Over current and over temperature protection
‹ Enable pin
‹ 10µA quiescent current in shutdown
‹ Low reverse leakage (output to input)
‹ Surface mount and through-hole packages
‹ Full industrial temperature range
‹ Available in SOIC-8EDP package
Applications
‹ Battery powered systems
‹ Motherboards
‹ Peripheral cards
‹ Network cards
‹ Set Top Boxes
‹ Medical Equipment
‹ Notebook Computers
VIN
ENABLE
SC4205
4 _NC
NC ⁵
3 _VIN
VO ⁶
VO
2 _EN
ADJ ⁷
1 _NC
GND ⁸
R1
VO
= ^{1.2 (R1 + R2)}
Volts
R2
U1
C1
C2
R2
VIN
ENABLE
SC4205
4
NC
NC
5
3
VIN
VO
6
2
EN
ADJ
7
1
NC
GND
8
U1
C1
VO
VIN
ENABLE
C2
4
3
2
1
C1
SC4205
NC
NC
5
VIN
VO
6
EN
ADJ
7
NC
GND
8
U1
VO
C2
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V.
(2) This device is designed to operate with ceramic input and output capacitors.
Revision: June 28, 2004
1
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