2010/3/2
GM66300 Series
3.0A ULTRA LOW DROPOUT VOLTAGE
REGULATORS
Description
The GM66300, GM66301 and GM66302 are
3.0A, low dropout linear voltage regulators that
provide a low voltage, high-current output with a
minimum of external components. Utilizing
proprietary Super beta PNP pass element, the
GM66300/1/2 offers extremely low dropout
(typically 400mV at 3.0A) and low ground current
(typically 36mA at 3.0A).
The GM66300/1/2 is ideal for PC add-in cards
that need to convert from standard 3.3V to 2.5V
or 2.5V to 1.8V. A guaranteed maximum dropout
voltage of 500mV over all operating conditions
allows the GM66300/1/2 to provide 2.5V from a
supply as low as 3V, and 1.8V from a supply as
low as 2.5V. The GM66300/1/2 also has fast
transient response for heavy switching
applications. The device requires only 47µF of
output capacitance to maintain stability and
achieve fast transient response.
The GM66300/1/2 is fully protected with over
current limiting, thermal shutdown,
reversed-battery protection, reversed-leakage
protection, and reversed-lead insertion. The
GM66301 offers a TTL-logic compatible enable
pin and an error flag that indicates under voltage
and over current conditions. Offered in fixed
voltages, the GM66300/1 comes in the TO-220
and TO-263 packages and is an ideal upgrade to
older, NPN-based linear voltage regulators.
The GM66302 is adjustable version, with On/Off
feature.
Features
3.0A minimum guaranteed output current
500mV maximum dropout voltage over
temperature, which is ideal for 3.0V to 2.5V
conversion and 2.5V to 1.8V conversion.
1% initial accuracy
Low ground current
Current limiting and Thermal shutdown
Reversed-battery protection
Reversed-leakage protection
Fast transient response
Error flag output (GM66301 only)
Adjustable version (GM66302 only)
Application
PC Add-in Cards
High Efficiency Linear Power Supplies
Multi-media and PC Processor Supplies
Low Voltage Microcontrollers
Automotive Electronics
Typical Application Circuits
GM66300-2.5
V
IN
3.3V
Enable
V
IN
Gnd
V
OUT
47uF
V
OUT
2.5V
Shutdown
V
IN
3.3V
GM66301-2.5
Enable
Flag
Error Flag Output
V
OUT
2.5V
Gnd
V
OUT
47uF
Enable
Shutdown
V
IN
1.0uF
GM66302
Enable
V
IN
V
OUT
Adj
47uF
V
OUT
Gnd
www.gammamicro.com.tw
GM66300
V2.01
1
Analogue and Mixed Signal
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