FDMF8704V Fairchild Semiconductor, FDMF8704V Datasheet - Page 8

• Manufacturer Part Number: FDMF8704V
• Description: IC MOD DVR/FET W/VREG 56MLP 8X8
• Manufacturer: Fairchild Semiconductor
• Type: Step-Down (Buck)r

Specifications of FDMF8704V

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 3.2 V
• Current - Output: 32A
• Frequency - Switching: 1MHz
• Voltage - Input: 7 ~ 20 V
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 56-MLP
• Power - Output: 10W
• Supply Voltage (min): 4.5 V
• Supply Current: 50 mA
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Drivers: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FDMF8704VTR

FDMF8704V Rev. G
Application Information
Supply Capacitor Selection
For the supply input (V
bypass capacitor is recommended to reduce the noise and to
supply the peak current. Use at least a 1µF, X7R or X5R capac-
itor. Keep this capacitor close to the FDMF8704V V
CGND pins.
Bootstrap Circuit
The bootstrap circuit uses a charge storage capacitor (C
and the external schottky diode, as shown in Figure 18. A
Typical Application
V
IN
12V
PWM
Controller
Signal
GND
VCC
CIN
GND
) of the FDMF8704V, a local ceramic
Power
GND
PWM1
PWM2
PWM3
PWM4
EN
Figure 17. Typical Application
CIN
BOOT
and
VAUX
VAUX
VAUX
VAUX
VIN
PWM
DISB
VIN
PWM
DISB
VIN
PWM
DISB
VIN
PWM
DISB
CGND PGND
CGND PGND
CGND PGND
CGND PGND
)
8
NPN-TR
NPN-TR
NPN-TR
NPN-TR
REG REGFB
REG REGFB
REG REGFB
REG REGFB
bootstrap capacitance of 100nF, X7R or X5R capacitor is
adequate.
The peak surge current rating of the boot diode should be
checked in-circuit, since this is dependent on the equivalent
impedance of the entire bootstrap circuit, including the PCB
traces. Boot diode must be sized big enough to carry the
forward charge current. Refer to Figure 14 for boot diode
average forward current.
The bootstrap diode must have low V
leakage. Breakdown voltage of the bootstrap diode must be
greater than the BOOT to VSWH voltage.
VSWH
VSWH
VSWH
VSWH
BOOT
BOOT
BOOT
BOOT
HSEN
HSEN
HSEN
HSEN
VCIN
VCIN
VCIN
VCIN
FDMF8704V
FDMF8704V
FDMF8704V
FDMF8704V
F
and low reverse current
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VOUT