GM7110-12TA5T GAMMA [Gamma Microelectronics Inc.], GM7110-12TA5T Datasheet - Page 6

• Manufacturer Part Number: GM7110-12TA5T
• Description: 1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
• Manufacturer: GAMMA [Gamma Microelectronics Inc.]

6
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring
inductance generate voltage transients, which can cause problems. To minimize inductance and ground loops,
the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Single-
point grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When
using the Adjustable version, place the programming resistors as close as possible to GM7110, to keep the
sensitive feedback wiring short.
TEST CIRCUIT AND LAYOUT GUIDELINES
Unregulated
DC Input
V
MICROELECTRONICS
IN
A
Figure 1(a). Fixed Output Voltage Versions
+
100 µF
A
C
IN
+V
C - 100 µF, 75V, Aluminum Electrolytic
C
D1 - Schottky, MBR360
L1 - 330 µH,
R1 - 2k, 0.1%
R2 - 6.12k, 0.1%
IN
GND 3
IN
OUT
1
- 330 µF, 25V, Aluminum Electrolytic
FIXED OUTPUT
GM 7110
3L Electronic Corp. TC-331M-1.0A- 5026
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
ON/OFF
Power Management
5
Output
Feedback
4
2
D1
MBR360
330 µH
L1
330 µF
+
C
OUT
GM7110
V
OUT
L
O
A
D