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Cherry Semiconductor Corporation

CS5231-3 Datasheet Preview

CS5231-3 Datasheet

500mA/ 3.3V Linear Regulator with Auxiliary Control

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CS5231-3
500mA, 3.3V Linear Regulator
with Auxiliary Control
Description
Features
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.
Block Diagram
VOUT
VIN
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
Package Options
5 Lead D2PAK
10k50k
Internal
Bias
AuxDrv
Gnd
VIN UV +
Comparator
Bandgap
Reference
Thermal
Shutdown
Current
Limit
Error
Amp
VREF
Shutdown
1
1. No Connect
2. VIN
3. Gnd
4. VOUT
5. AuxDrv
Tab = Gnd
Consult factory for other package
options.
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
1 A ® Company




Cherry Semiconductor Corporation

CS5231-3 Datasheet Preview

CS5231-3 Datasheet

500mA/ 3.3V Linear Regulator with Auxiliary Control

No Preview Available !

Absolute Maximum Ratings
Maximum Operating Junction Temperature ..........................................................................................................................150°C
Storage Temperature Range .....................................................................................................................................-65°C to +150°C
Lead Temperature Soldering
Reflow (SMD styles only) ...........................................................................................60 sec. max above 183°C, 230°C peak
ESD Damage Threshold (Human Body Model)....................................................................................................................2kV
PIN SYMBOL
VIN
VOUT
AuxDrv
Gnd
PIN NAME
IC Power Input
Output Voltage
Auxiliary Drive Output
IC Ground
VMAX
14V
6V
14V
N/A
VMIN
-0.3V
-0.3V
-0.3V
N/A
ISOURCE
100mA
Internally
Limited
10mA
N/A
ISINK
Internally
Limited
100mA
50mA
N/A
Electrical Characteristics: 0°C < TA < 70°C, 0°C < TJ < 125°C, 4.75V VCC < 6V, COUT 10µF with ESR < 1,
IOUT = 10mA, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
s Linear Regulator
Output Voltage
10mA < IOUT < 500mA
Line Regulation
Load Regulation
Ground Current
Reverse Current
Current Limit
Thermal Shutdown
Thermal Shutdown Hysteresis
IOUT = 10mA,
VIN = 4.75V to 6V
VIN = 5V,
IOUT = 10mA to 500mA
IOUT = 10mA
IOUT = 500mA
VIN = 0V, VOUT = 3.3V
0V < VOUT < 3.2V
Note 1
Note 1
3.234
-2%
0.55
150
3.300
1
5
2
3
0.45
0.85
180
25
3.366
+2%
5
15
3
6
1
1.2
210
V
mV
mV
mA
mA
mA
A
°C
°C
s Auxiliary Drive
Upper VIN Threshold
Lower VIN Threshold
VIN Threshold Hysteresis
Output Low Voltage
Output Low Peak Voltage
AuxDrv Current Limit
Response Time
Pull-Up/Down Resistance
Increase VIN until regulator turns on
and AuxDrv drives high
Decrease VIN until regulator turns off
and AuxDrv drives low
IAuxDrv = 100µA,
1V < VIN < 4.5V
Increase VIN from 0V to 1V.
Record peak AuxDrv output voltage
VAuxDrv = 1V,
VIN = 4.0V
Step VIN from 5V to 4V, measure time
for VAuxDrv to drive low. Note 1
VIN = 0V and VIN > 4.7V
4.35 4.5 4.65 V
4.25 4.4 4.55 V
75 100 125 mV
0.1 0.4 V
0.65 0.9 V
0.5 6
25 mA
1 10 µs
5 10 25 k
Note 1: Guaranteed by design, not 100% production tested. Thermal shutdown is 100% functionally tested at wafer
probe.
2


Part Number CS5231-3
Description 500mA/ 3.3V Linear Regulator with Auxiliary Control
Maker Cherry Semiconductor Corporation
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Cherry Semiconductor Corporation





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