LP2957_15 Datasheet, PDF (2/24 Pages) Texas Instruments – 5V Low-Dropout Regulator for μP Applications

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, T_A. 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,
θ_JA 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 T_J = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V_IN = 6V, I_L = 1 mA, C_L = 2.2 µF, V_SD = 3V.
Symbol
Parameter
Conditions
Typical
LP2957AI
Min
Max
LP2957I
Min
Max
Units
V_O
Output Voltage⁽¹⁾
5.0
4.975 5.025 4.950 5.050
4.940 5.060 4.900 5.100
V
1 mA ≤ I_L ≤ 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
V_IN = 6V to 30V
0.03
0.10
0.20
0.20
%
0.40
V_IN–V_O
Load Regulation
Dropout Voltage⁽⁴⁾
I_L = 1 mA to 250 mA
I_L = 0.1 mA to 1 mA⁽³⁾
I_L = 1 mA
I_L = 50 mA
I_L = 100 mA
I_L = 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.
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