MICROELECTRONICS
A
A
Power Management
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Description
GM7110 of regulators provides all the active functions
for a step- down (buck) switching regulator, and drives
1A load with excellent line and load regulation.
GM7110 is available in fixed output volt ages of 3.3V,
5V, 12V, 15V and a versatile Adjustable output
version. These regulators are simple to use and require
a minimum number of external components.
Features include internal frequency compensation and
a fixed- frequency oscillator. GM7110 high-efficiency
replacement for popular three-terminal linear regulators,
and is requiring a smaller heat sink or even no heat sink.
GM7110 performs well with standard inductors from
several manufacturers, and simplifying the design of
switch-mode power supplies. GM7110 guarantees ±4%
tolerance on output voltage within specified input voltages
and output load conditions, and ±10% on the oscillator
frequency.
External shutdown is included with 50 uA(typical)
standby current. The output switch has cycle-by-cycle
current limiting as well as thermal shutdown for full
protection under fault conditions.
Features
3.3V, 5V, 12V, 15V and Adjustable output
versions
Adjustable version output voltage range
1.23V to 37V ±4% max over line and load
conditions
1A output current
Requires Only 4 External Components
High Efficiency
TTL shutdown capability and low power
standby mode
Thermal shutdown, current limit protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
Application
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/ board switching regulators
Positive to negative converter (buck-boost
)
TYPICAL APPLICATION
7V - 40V
Unregulated
DC Input
100 µF
+V
IN
1
C
IN
+
GM7110-5.0
3 GND ON / OFF 5
Output
2
L1
330 µH
D1
1N5819
+
C
OUT
330 µF
5.0V, 1A
Regulated
Output
www.gammamicro.com
GM7110
V0.1
1
Feedback
4
GM 431
GAMMA [ GAMMA MICROELECTRONICS INC. ]
