FDMF8705 Fairchild Semiconductor, FDMF8705 Datasheet - Page 7

• 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
Figure 16. PWM Threshold Voltage vs. Driver Supply Voltage
-13
-11
3.0
2.7
2.4
2.1
1.8
1.5
1.2
VSWH
HDRV
LDRV
-9
-7
-5
-3
PWM
6
0
Figure 20. Switching Waveform at Iout = 0A
V
V
IH
IL
7
Figure 18. VSWH vs. Transient Duration
100
8
9
Transient Duration, nsec
Driver Supply Voltage, V
V
V
V
f
I
sw
OUT
200
IN
CIN
OUT
= 500KHz
= 12V
10
= 0A
= 12V
= 1.3V
11
300
12
13
400
14
500
15
7
36
35
34
33
32
31
30
3.0
2.7
2.4
2.1
1.8
1.5
1.2
Figure 19. Boot to Ground Voltage vs. Transient Duration
VSWH
HDRV
LDRV
PWM
0
-50
Figure 17. PWM Threshold Voltage vs. Temperature
V
Figure 21. Switching Waveform at Iout = 18A
CIN
= 12V
-25
100
0
Transient Duration, nsec
25
200
Temperature,
V
V
IL
IH
50
300
o
C
75
100
V
V
V
f
I
sw
OUT
www.fairchildsemi.com
IN
CIN
OUT
400
= 500KHz
= 12V
= 18A
= 12V
125
= 1.3V
150
500