gm7109 Gamma Microelectronics, gm7109 Datasheet - Page 7

• Manufacturer Part Number: gm7109
• Description: 150khz, 2a Step Down Voltage Switching Regulators
• Manufacturer: Gamma Microelectronics

Typical Performance Characteristics
Figure 7. Shutdown Quiescent Current
1.4
1.3
150
100
1.2
1.1
1.0
0.9
0.8
0.7
0.6
Figure 9. SD Pin Current (Sinking)
Figure 3. Switch Saturation Voltage
1.6
1.4
1.2
1.0
0.8
0.6
80
60
40
20
8
7
6
5
4
3
2
1
0
-50 -25
0
0
0
0
JUNCTION TEMPERATURE (°C)
T
25°
Figure 5. Dropout Voltage
I
J
LOAD
= - 40°C
C
5
SWlTCH CURRENT (A)
T
= 1A
SUPPLY VOLTAGE (V)
SD PlN VOLTAGE(V)
10
J
1
= 25
0
T
125 °C
J
10
= -40
°C
25
V
T
J
L = 33µH
R
V
IN
20
2
= -40
IND
OUT
°C and 125°C
= 40V
I
LOAD
15
50
= 0.04
= V
V
°C and 125°C
V
= 2A
ON/OFF
REG
lN
75
30
=12V
3
20
= 50mV
100
= 5V
25
40
4
Figure 8. Minimum Operating Supply Voltage
150KHz, 2A STEP DOWN VOLTAGE
Figure 6. Operating Quiescent Current
5.5
5.0
4.5
4.0
3.5
160
155
150
145
140
135
130
120
24
20
16
12
5
4
3
2
1
0
-50 -25
8
4
0
-50 -25
-50 -25
-50
Figure 4. Switch Current Limit
Figure 10. Switching Frequency
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
V
I
LOAD
OUT
-25
JUNCTlON TEMPERATURE (°C)
Switch ON
= 1.23V
= 120mA
SWITCHING REGULATORS
0
0
0
0
25
25
25
25
Switch OFF
50
50
50
4.5V < V
I
SWITCH
5 0
GM7109
75
75
75
75
V
V
= 0
OUT
lN
IN
100 125
= 12V
100
100 125
< 40V
100 1 2 5
=5V
125
7