FDMF8705 Fairchild Semiconductor, FDMF8705 Datasheet - Page 5

• Manufacturer Part Number: FDMF8705
• Description: IC MODULE DRIVER/FET POWER88-56
• Manufacturer: Fairchild Semiconductor
• Type: Step-Down (Buck)r

Specifications of FDMF8705

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Current - Output: 18A
• Frequency - Switching: 500kHz
• Voltage - Input: 12V
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 56-MLP
• Power - Output: 6.25W
• Supply Voltage (min): 6.4 V
• Supply Current: 8 mA
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: FDMF8705TR

FDMF8705 Rev. C
Typical Characteristics
20
15
10
1.20
1.15
1.10
1.05
1.00
0.95
0.90
1.10
1.08
1.05
1.03
1.00
0.98
0.95
5
0
0
200
V
V
f
L = 0.68uH
Figure 4. Safe Operating Area vs. PCB Temperature
SW
7
IN
OUT
V
V
I
L = 0.68uH
V
V
I
L = 0.68uH
f
= 12V
= 500KHz
OUT
OUT
SW
IN
OUT
IN
OUT
Figure 8. Power Loss vs. Driver Supply Voltage
= 1.3V
Figure 6. Power Loss vs. Switching Frequency
= 12V
= 12V
= 300KHz
= 18A
= 18A
= 1.3V
= 1.3V
25
250
8
50
300
Switching Frequency, KHz
PCB Temperature,
9
Driver Supply Voltage, V
75
350
10
o
C
100
400
11
125
450
12
150
500
13
5
6
5
4
3
2
1
0
1.10
1.05
1.00
0.95
0.90
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0
V
V
L = 0.68uH
IN
OUT
0.8
6
= 12V
Figure 5. Module Power Loss vs. Output Current
V
I
L = 0.68uH
f
V
I
L = 0.68uH
f
= 1.3V
OUT
SW
OUT
SW
OUT
IN
= 300KHz
= 12V
= 300KHz
= 18A
= 18A
= 1.3V
3
7
Figure 9. Power Loss vs. Output Voltage
Figure 7. Power Loss vs. Input Voltage
1.2
(V
8
O
6
measured at VSWH pin)
1.6
9
Output Voltage, V
Input Voltage, V
I
LOAD
10
9
2.0
, A
11
f
SW
12
= 500KHz
2.4
12
f
SW
www.fairchildsemi.com
13
= 300KHz
15
2.8
14
3.2
18
15