IR3651SPBF International Rectifier, IR3651SPBF Datasheet - Page 4

• Manufacturer Part Number: IR3651SPBF
• Description: IC CTLR SYNC PWM BUCK 14-SOIC
• Manufacturer: International Rectifier

Specifications of IR3651SPBF

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 460kHz
• Duty Cycle: 80%
• Voltage - Supply: 4.5 V ~ 13.2 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 125°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Frequency-max: 460kHz
• Package: 14-Pin SOIC (NB)
• Circuit: Sync PWM Controller
• Vcc (min): 4.5
• Vcc (max): 13.2
• Iout (a): 25
• Switch Freq (khz): programmable to 400kHz
• Pbf: PbF Option Available
• For Use With: IRDC3651 - KIT REF DESIGN SYNCH BUCK REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12/07/2010
Pin Description
Pin Name
10
11
12
13
14
1
2
3
4
5
6
7
8
9
DRVcc
SS/SD
OCSet
SYNC
Comp
PGnd
HDrv
LDrv
Gnd
Vcc
Vb
Fb
Vs
Rt
Inverting input to the error amplifier. This pin is connected directly to the
output of the regulator via resistor divider to set the output voltage and
provide feedback to the error amplifier.
Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
Soft start / shutdown. This pin provides user programmable soft-start
function. Connect an external capacitor from this pin to ground to set the
start up time of the output voltage. The converter can be shutdown by
pulling this pin below 0.3V.
The internal oscillator can be synchronized to an external clock via this
pin.
Power Ground. This pin serves as a separate ground for the MOSFET
driver and should be connected to the system’s power ground plane.
Output driver for low side MOSFET.
This pin provides biasing for the internal low side driver. A minimum of
0.1uF, high frequency capacitor must be connected from this pin to power
ground.
This pin powers the high side driver and must be connected to a voltage
higher than bus voltage. A minimum of 0.1uF, high frequency capacitor
must be connected from this pin to switch node.
Output driver for high side MOSFET
Switch node. Connect this pin to the source of the upper MOSFET and
the drain of the lower MOSFET. This pin is return path for the upper gate
driver.
This pin provides power for the internal blocks of the IC. A minimum of
0.1uF, high frequency capacitor must be connected from this pin to
ground.
Current limit set point. A resistor from this pin to drain of low side
MOSFET will set the current limit threshold.
Signal ground for internal reference and control circuitry.
Connecting a resistor from this pin to ground sets the oscillator frequency.
Description
IR3651SPBF
4