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SC4205 fiches techniques PDF

Semtech Corporation - Very Low Dropout 1 Amp Regulator

Numéro de référence SC4205
Description Very Low Dropout 1 Amp Regulator
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC4205 fiche technique
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-
www.DatacSehelleet4nUt.croemgulation 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
4
3
2
1
C1
SC4205
NC NC
VIN VO
EN ADJ
NC GND
U1
5
6
7
8
VO VIN
ENABLE
C2
4
3
2
1
C1
SC4205
NC NC
VIN VO
EN ADJ
NC GND
5
6
7
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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