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CS5231-3 数据表(PDF) 1 Page - Cherry Semiconductor Corporation

部件名 CS5231-3
功能描述  500mA, 3.3V Linear Regulator with Auxiliary Control
Download  11 Pages
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制造商  CHERRY [Cherry Semiconductor Corporation]
网页  http://www.cherrycorp.com/
标志 CHERRY - Cherry Semiconductor Corporation

CS5231-3 数据表(HTML) 1 Page - Cherry Semiconductor Corporation

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Features
500mA, 3.3V Linear Regulator
with Auxiliary Control
CS5231-3
Description
Block Diagram
1
1
1. No Connect
2. VIN
3. Gnd
4. VOUT
5. AuxDrv
Tab = Gnd
A
Company
®
Rev. 3/31/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Consult factory for other package
options.
The CS5231-3 combines a three-
terminal linear regulator with cir-
cuitry to control an external PFET
transistor with the intent of manag-
ing two input supplies. A 5V sup-
ply powers the regulator while an
auxiliary 3.3V supply is controlled
by the IC. The design has been opti-
mized to provide a “glitch-free”
transition between the two sup-
plies.
The CS5231-3 linear regulator pro-
vides a fixed 3.3V output @ 500mA
with an overall accuracy of ± 2%.
The NPN-PNP composite pass tran-
sistor provides a low dropout volt-
age and requires less supply cur-
rent than PNP designs. Full protec-
tion including current limit and
thermal shutdown is provided.
Also designed for low reverse cur-
rent, the IC prevents excessive cur-
rent from flowing from the output
to ground if the regulator input
voltage is lower than the output
voltage.
The CS5231-3 also controls an auxil-
iary supply that can provide power
to the regulator output when input
voltage for the regulator is not
available. The AuxDrv auxiliary
output is normally pulled up to the
regulator input voltage and drives
low whenever the input voltage
drops below 4.4V (nominal). It is
typically used to control a PFET
switch that connects a 3.3V auxil-
iary supply to the regulator output.
The CS5231-3 is available in a
5-lead D2PAK (TO-263) package.
Applications include Network
Interface Cards (NICs), modem
cards and power supplies with
multiple input sources.
Linear Regulator
s 3.3V ± 2% Output Voltage
s 3mA Quiescent Current
@ 500mA
s Fast Transient Response
s Current Limit
s Thermal Shutdown with
Hysteresis
s 450µA Reverse Output
Current
s Fast Transient Response
System Power Management
s Auxiliary Supply Control
+
Internal
Bias
Bandgap
Reference
Thermal
Shutdown
Current
Limit
VIN
10kΩ
50kΩ
AuxDrv
Gnd
VIN UV
Comparator
VREF
Error
Amp
Shutdown
VOUT
Package Options
5 Lead D2PAK


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