FDMF6730 Fairchild Semiconductor, FDMF6730 Datasheet - Page 5

• Manufacturer Part Number: FDMF6730
• Description: IC DRIVER FET MULTICHIP 40-MLP
• Manufacturer: Fairchild Semiconductor

Specifications of FDMF6730

• Applications: Power Supplies
• Current - Supply: 2mA
• Voltage - Supply: 6 V ~ 16 V
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 40-MLP, Power66
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FDMF6730TR

FDMF6730 Rev. D2
Description of Operation
2-Bit PWM Input
The PWM input is composed of a high side drive and a low side
drive input which control the high side and low side FETs
respectively. They can also be setup to provide asynchronous
rectification (low FET off) and phase shutoff (both FETs off).
Truth Table
PASS FET
One of the most unique features of the uDrMOS is the
integrated Pass FET. The pass FET can be easily routed in
parallel with the low side FET in order to provide up to 10A of
current. When not used as part of the DC-DC controller, it can
be used in other applications such as load switching, etc.
5V LDO
The uDrMOS conveniently incorporates a 5V LDO regulator to
drive the internal logic of the IC and gates of the internal
MOSFETs.
Adjustable LDO
Another feature of the part is the adjustable 100mA LDO. The
LDO output voltage is easily configured with a resistor divider.
Current Limit
The part also has current limit flag which is set by an internal
OCP topology.
DRIVE_LS
0
0
1
1
DRIVE_HS
0
1
0
1
Low Side
MOSFET
OFF
OFF
OFF
ON
High Side
MOSFET
OFF
OFF
OFF
ON
5
Applications Section
Input Capacitor
A High frequency 4.7ceramic X5R must be connected directly
from V
Bootstrap Circuit
The bootstrap circuit uses a charge storage capacitor and an
external diode. A minimum of 0.1 F high frequency capacitor
must be connected between the BOOT and PHASE pin. The
PHASE pin is already internally connected to the switch-node.
5V LDO
A minimum of 4.7 F ceramic X5R type must be connected from
LDO_5V pin to GND to ensure stable operation and to provide
high frequency bypassing for low side driver. This LDO can
provide power to the internal logic circuitry and gate drivers via
a 10Ohm resistor. A high frequency 1 F ceramic capacitor
must be placed from V
Adjustable LDO
A minimum of 10 F ceramic X5R type must be connected close
from this pin to GND to insure stable operation for a range of
2.5V to 5V outputs. For output voltages of 0.6V to 2.5V the
minimum capacitance must be 22 F ceramic type. A minimum
of 1mA load current must be connected from this pin to GND.
LDO_ADJ voltage 0.6V typical.
LDO_EN: Adjustable LDO enable pin (1= Enable, 0= Disable)
Over Current Protection
A resistor connected from the VSWH pin and this pin programs
the over current threshold point. CS_OUT is the output of an
internal current sense comparator which switches high when
the current in low side MOSFET exceeds a pre program level
set by the CS_PROG pin. This pin is low during normal
operation.
IN
to GND
CC
to GND.
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