Description
The GM6603 series of positive adjustable and fixed regula-
tors are designed to provide 3.0A output with low dropout
voltage performance.
On-chip trimming adjusts the reference voltage to 2.0%.
Put them to work in post regulators or microprocessor
power supplies where low voltage operation and fast tran-
sient response are required.
Device includes over-current protection and thermal shut-
down protection as well.
Pin-to-pin compatible with the LT1085 family of regulators,
the GM6603's are available in TO-252, TO-220 and sur-
face-mount TO-263 packages.
Application
Microprocessor Supply
Post Regulators for Switching Supplies
Telecommunication Systems
Printer Supplies
Motherboards
Features
Adjustable or Fixed Output
Output Current of 3.0A
Dropout Voltage (typical) 1.3V @ 3.0A
Typical Line Regulation 0.015%
Typical Load Regulation 0.05%
Fast Transient Response
Current Limit Protection
Thermal Shutdown Protection
www.gammamicro.com
1
GM6603
3.0A PRECISION LINEAR REGULATORS
Power Management
PRELIMINARY
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
VOUT
GND
VIN
GM6603-3.3
(Fixed Version)
+
+
C1
10µF
Tant
C2
10µF
Tant. Min
V
= 3.3V
OUT
V > 4.75V
IN
VOUT
ADJ
VIN
+
+
C1
10µF
Tant
C2
10µF
Tant. Min
V
= 3.45V
OUT
V > 4.75V
IN
GM6603-Adj
R1
133W
1.0%
R2
232W
1.0%
2
3
1
2
3
1
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
V
V
R2
=
X (1 +
) + I
X
OUT
REF
ADJ
R2
R1
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