LM338-MIL Datasheet, PDF (1/28 Pages) Texas Instruments – 5-Amp Adjustable Regulators

Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
LM338-MIL 5-Amp Adjustable Regulators
LM338-MIL
SNVSAX2 – JUNE 2017
1 Features
•1 Specified 7-A Peak Output Current
• Specified 5-A Output Current
• Adjustable Output Down to 1.2 V
• Specified Thermal Regulation
• Current Limit Constant With Temperature
• P ⁺ Product Enhancement Tested
• Output is Short-Circuit Protected
2 Applications
• Adjustable Power Supplies
• Constant Current Regulators
• Battery Chargers
3 Description
The LM338-MIL series of adjustable 3-terminal
positive voltage regulators is capable of supplying in
excess of 5 A over a 1.2-V to 32-V output range.
They are exceptionally easy to use and require only 2
resistors to set the output voltage. Careful circuit
design has resulted in outstanding load and line
regulation, comparable to many commercial power
supplies. The LM338-MIL family is supplied in a
standard 3-lead transistor package.
A unique feature of the LM338-MIL family is time-
dependent current limiting. The current limit circuitry
allows peak currents of up to 12 A to be drawn from
the regulator for short periods of time. This allows the
LM338-MIL to be used with heavy transient loads and
speeds start-up under full-load conditions. Under
sustained loading conditions, the current limit
decreases to a safe value protecting the regulator.
Also included on the chip are thermal overload
protection and safe area protection for the power
transistor. Overload protection remains functional
even if the adjustment (ADJ) pin is accidentally
disconnected.
Normally, no capacitors are needed unless the device
is situated more than 6 inches from the input filter
capacitors in which case an input bypass is needed.
An output capacitor can be added to improve
transient response, while bypassing the adjustment
pin increases the ripple rejection of the regulator.
Besides replacing fixed regulators or discrete
designs, the LM338-MIL is useful in a wide variety of
other applications. Because the regulator is floating
and receives only the input-to-output differential
voltage, supplies of several hundred volts can be
regulated as long as the maximum input to output
differential is not exceeded; do not short-circuit output
to ground. The part numbers in the LM338-MIL series
which have a K suffix are packaged in a standard
steel TO-CAN package, while those with a T suffix
are packaged in a TO-220 plastic package. The
LM338-MIL is rated for T_J = –55°C to 150°C, and the
LM338-MIL is rated for T_J = 0°C to 125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM338-MIL
TO-220 (3)
TO-CAN (2)
10.16 mm × 14.986 mm
25.40 mm × 38.94 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Pin 1. Adjustment
2. Output
3. Input
Tab/Case is Output
Available Packages
3
1
TO-220
1
2
3
TO-3
Typical Application Circuit
TI DEVICE
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.