LP2954A_15 Datasheet, PDF (2/24 Pages) Texas Instruments – LP2954/LP2954A 5V and Adjustable Micropower Low-Dropout Voltage Regulators

LP2954, LP2954A
SNVS096D – JUNE 1999 – REVISED MARCH 2013
www.ti.com
Absolute Maximum Ratings⁽¹⁾⁽²⁾
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 5 seconds)
Power Dissipation⁽³⁾
Input Supply Voltage
ESD Rating⁽⁴⁾
LP2954AI/LP2954I
−40°C to +125°C
−65°C to +150°C
260°C
Internally Limited
−20V 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_J-A, 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, 73°C/W for the
DDPAK/TO-263, and 160°C/W for the SOIC-8. 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 LP2954. Some typical values are listed for interface materials used with TO-220:
(4) Human body model, 200pF discharged through 1.5kΩ.
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