Texas Instruments TPPM 0303 INSTALLATION INSTRUCTIONS
TPPM0303
250-mA LOW-DROPOUT REGULATOR
WITH AUXILIARY POWER MANAGEMENT
SLVS364 – FEBRUARY 2001
D
Automatic Input Voltage Source Selection
D
Glitch-Free Regulated Output
D
5-V Input Voltage Source Detector With
Hysteresis
D
250-mA Load Current Capability With 5-V or
3.3-V Input Source
D
Low r
Auxiliary Switch
DS(on)
5VAUX
5VCC
3.3VOUT
3.3VAUX
D PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
NC
GND
NC
NC
description
The TPPM0303 is a low-dropout regulator with auxiliary power management that provides a constant 3.3-V
supply at the output capable of driving a 250-mA load.
The TPPM0303 provides a regulated power output for systems that have multiple input sources and require a
constant voltage source with a low-dropout voltage. This is a single output, multiple input, intelligent power
source selection device with a low-dropout regulator for either 5VCC or 5VAUX inputs, and a low-resistance
bypass switch for the 3.3VAUX input.
Transitions may occur from one input supply to another without generating a glitch outside of the specification
range on the 3.3-V output. The device has an incorporated reverse-blocking scheme to prevent excess leakage
from the input terminals in the event that the output voltage is greater than the input voltage.
The input voltage is prioritized in the following order: 5VCC, 5VAUX, and 3.3VAUX.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 2001, Texas Instruments Incorporated
1
TPPM0303
I/O
DESCRIPTION
250-mA LOW-DROPOUT REGULATOR
WITH AUXILIARY POWER MANAGEMENT
SLVS364 – FEBRUARY 2001
functional block diagram
Linear Regulator
5VCC
5-V
Detection
With LDO
3.3VOUT
5VAUX
3.3VAUX
3VAUX
Detection
5VAUX
Detection
Gate Drive
and Control
Linear Regulator
With LDO
Gate Drive
and Control
Low ON
Resistance
Switch
Current
Sensor
Current
Sensor
Over
Temperature
GND
5-V Detection
and Control
Gate Drive
Terminal Functions
TERMINAL
NAME NO.
3.3VAUX 4 I 3.3-V auxiliary input
3.3VOUT 3 O 3.3-V output with a typical capacitance load of 4.7 µF
5VAUX 1 I 5-V auxiliary input
5VCC 2 I 5-V main input
GND 7 I Ground
NC 5,6,8 No internal connection
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Current
Sensor
TPPM0303
250-mA LOW-DROPOUT REGULATOR
WITH AUXILIARY POWER MANAGEMENT
SLVS364 – FEBRUARY 2001
Table 1. Input Selection
INPUT VOLTAGE STATUS
(V)
5VCC 5VAUX 3.3VAUX 5VCC/5VAUX/3.3VAUX 3.3VOUT IL (mA)
0 0 0 None 0 0
0 0 3.3 3.3VAUX 3.3 250
0 5 0 5VAUX 3.3 250
0 5 3.3 5VAUX 3.3 250
5 0 0 5VCC 3.3 250
5 0 3.3 5VCC 3.3 250
5 5 0 5VCC 3.3 250
5 5 3.3 5VCC 3.3 250
INPUT SELECTED
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, 5-V main input, V
Auxiliary voltage, 5-V input, V
Auxiliary voltage, 3.3-V input, V
3.3-V output current limit, I
(LIMIT)
(5VCC)
(5V AUX)
(3.3V AUX)
1.5 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation (low-K), P
Electrostatic discharge susceptibility, human body model, V
(see Notes 1 and 2) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Notes 1 and 2) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Notes 1 and 2) 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3) 0.625 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D
(HBMESD)
OUTPUT
(V)
OUTPUT
(I)
2 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Operating ambient temperature range, TA 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
–55°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
Operating junction temperature range, TJ –5°C to 120°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature (soldering, 10 second), T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to GND.
2. Absolute negative voltage on these terminal should not be below –0.5 V.
3. The device derates with increase in ambient temperature, TA. See Thermal Information section.
260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(LEAD)
recommended operating conditions
5-V main input, V
5-V auxiliary input, V
3.3-V auxiliary input, V
Load capacitance, C
Load current, I
Ambient temperature, T
(5VCC)
(5VAUX)
(3.3VAUX)
L
L
A
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MIN TYP MAX UNIT
4.5 5.5 V
4.5 5.5 V
3 3.6 V
4.23 4.7 5.17 µF
0 250 mA
0 70 °C
3
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