LT138A Datasheet, PDF (1/12 Pages) Linear Technology – 5A Positive Adjustable Voltage Regulator

FEATURES
s _{Guaranteed 1% Initial Tolerance}
s _{Guaranteed 0.3% Load Regulation}
s _{Guaranteed 5A Output Current}
s _{100% Thermal Limit Burn-In}
s _{12A Transient Output Current}
U
APPLICATIO S
s _{High Power Linear Regulator}
s _{Battery Chargers}
s _{Power Driver}
s _{Constant-Current Regulator}
LT138A/LT338A
LM138/LM338
5A Positive Adjustable
Voltage Regulator
DESCRIPTIO
The LT^®138A series of adjustable regulators provide 5A
output current over an output voltage range of 1.2V to 32V.
The internal voltage reference is trimmed to less than 1%,
enabling a very tight output voltage. In addition to excel-
lent line and load regulation, with full overload protection,
the LT138A incorporates new current limiting circuitry
allowing large transient load currents to be handled for
short periods. Transient load currents of up to 12A can be
supplied without limiting, eliminating the need for a large
output capacitor.
The LT138A is an improved version of the popular LM138
with improved circuit design and advanced process tech-
niques to provide superior performance and reliability.
The graph below shows the significant improvement in
output voltage tolerance achieved by using the LT138A or
LT338A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Parallel Regulators for Higher Current*
LT338A
0.01Ω**
V_IN
V_IN
V_OUT
5V
8A
ADJ
LT350A
V_IN
V_OUT
ADJ
0.016Ω**
121Ω
1%
365Ω
1%
138/338 TA01
*THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES
**CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1%
Output Voltage Error
12
11
10
9
2% RESISTORS
8
LM338
7
6
1% RESISTORS
LM338
5
LT338A
4
2% RESISTORS
3
LT338A
2
1% RESISTORS
1
0
1
10
100
OUTPUT VOLTAGE (V)
138A/338A TA02
1