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LP2957A Datasheet Preview

LP2957A Datasheet

5V Low-Dropout Regulator

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LP2957, LP2957A
www.ti.com
SNVS102C – JUNE 1998 – REVISED APRIL 2013
LP2957/LP2957A 5V Low-Dropout Regulator for µP Applications
Check for Samples: LP2957, LP2957A
FEATURES
1
2 5V Output within 1.4% Over Temperature (A
Grade)
• Easily Programmed for Snap-On/Snap-Off
Output
• Ensured 250 mA Output Current
• Extremely Low Quiescent Current
• Low Input-Output Voltage Required for
Regulation
• Reverse Battery Protection
• Extremely Tight Line and Load Regulation
• Very Low Temperature Coefficient
• Current and Thermal Limiting
• Error Flag Signals when Output is out of
Regulation
APPLICATIONS
• High-Efficiency Linear Regulator
• Battery-Powered Regulator
DESCRIPTION
The LP2957 is a 5V micropower voltage regulator
with electronic shutdown, error flag, very low
quiescent current (150 µA typical at 1 mA load), and
very low dropout voltage (470 mV typical at 250 mA
load current).
Output can be wired for snap-on/snap-off operation to
eliminate transition voltage states where µP operation
may be unpredictable.
Output crowbar (50 mA typical pull-down current) will
bring down the output quickly when the regulator
snaps off or when the shutdown function is activated.
The part has tight line and load regulation (0.04%
typical) and low output temperature coefficient (20
ppm/°C typical).
The accuracy of the 5V output is ensured at room
temperature and over the full operating temperature
range.
The LP2957 is available in the five-lead TO-220 and
DDPAK/TO-263 packages.
Package Outline
Top View
Top View
Figure 1. Bent, Staggered Leads
5-Lead TO-220 Package
See Package Number NDH0005D
Figure 2. Plastic Surface Mount Package
5-Lead DDPAK/TO-263 Package
See Package Number KTT0005B
Side View
Figure 3. See Package Number KTT0005B
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
1
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.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1998–2013, Texas Instruments Incorporated




etcTI

LP2957A Datasheet Preview

LP2957A Datasheet

5V Low-Dropout Regulator

No Preview Available !

LP2957, LP2957A
SNVS102C – JUNE 1998 – REVISED APRIL 2013
www.ti.com
Absolute Maximum Ratings(1)(2)
Operating Junction
Storage Temperature Range
Lead Temperature (Soldering, 5 Seconds)
Power Dissipation(3)
Input Supply Voltage
Shutdown Input
ESD Rating
Temperature Range
40°C to +125°C
65°C to +150°C
260°C
Internally Limited
20V to +30V
0.3V to +30V
2 kV
(1) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply
when operating the device outside of its rated operating conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, T J(MAX), the junction-to-ambient thermal
resistance, θ JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using:
Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator
will go into thermal shutdown. The junction-to-ambient thermal resistance of the TO-220 (without heatsink) is 60°C/W and 73°C/W for
the DDPAK/TO-263. If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper
area thermally connected to the package: Using 0.5 Square inches of copper area, θ JA is 50°C/W, with 1 square inch of copper area,
θJA is 37°C/W; and with 1.6 or more square inches of copper area, θ JA is 32°C/W. The junction-to-case thermal resistance is 3°C/W. If
an external heatsink is used, the effective junction-to-ambient thermal resistance is the sum of the junction-to-case resistance (3°C/W),
the specified thermal resistance of the heatsink selected, and the thermal resistance of the interface between the heatsink and the
LP2957 (see Application Hints).
Electrical Characteristics
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 µF, VSD = 3V.
Symbol
Parameter
Conditions
Typical
LP2957AI
Min
Max
LP2957I
Min
Max
Units
VO
Output Voltage(1)
5.0
4.975 5.025 4.950 5.050
4.940 5.060 4.900 5.100
V
1 mA IL 250 mA
5.0
4.930 5.070 4.880 5.120
Output Voltage
Temperature Coefficient
See (2)
20
100
150 ppm/°C
Line Regulation
VIN = 6V to 30V
0.03
0.10
0.20
0.20
%
0.40
VIN–VO
Load Regulation
Dropout Voltage(4)
IL = 1 mA to 250 mA
IL = 0.1 mA to 1 mA(3)
IL = 1 mA
IL = 50 mA
IL = 100 mA
IL = 250 mA
0.04
60
240
310
470
0.16
0.20
100
150
300
420
400
520
600
800
0.20
%
0.30
100
150
300
420
mV
400
520
600
800
(1) When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped
to ground.
(2) Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
(3) Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested separately for load
regulation in the load ranges 0.1 mA–1 mA and 1 mA–250 mA. Changes in output voltage due to heating effects are covered by the
thermal regulation specification.
(4) Dropout voltage is defined as the input to output voltage differential at which the output voltage drops 100 mV below the value
measured with a 1V input to output differential.
2
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Copyright © 1998–2013, Texas Instruments Incorporated
Product Folder Links: LP2957 LP2957A


Part Number LP2957A
Description 5V Low-Dropout Regulator
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LP2957A Datasheet PDF






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