IR3837MTR1PBF Просмотр технического описания (PDF) - International Rectifier

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IR3837MTR1PBF

HIGHLY INTEGRATED 14A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

International Rectifier 

Pin Description

IR3837MPbF

Pin Name Description

Inverting input to the error amplifier. This pin is connected directly to the

1

Fb

output of the regulator via resistor divider to set the output voltage and

provide feedback to the error amplifier

2

Vref

External reference voltage, can be used for margining operation. A

100nF capacitor should be connected between this pin and Gnd.

3

Comp

Output of error amplifier. An external resistor and capacitor network is

typically connected from this pin to Fb to provide loop compensation

4

Gnd

Signal ground for internal reference and control circuitry

5

Rt

Use an external resistor from this pin to Gnd to set the switching

frequency

6

OCset

Current limit set point. A resistor from this pin to SW pin will set the

current limit threshold

7

PGood

Power Good status pin. Output is open drain. Connect a pull up resistor

from this pin to Vcc

External Synchronization, this pin is used to synchronize the device’s

8

Sync

switching with an external clock. It is recommended that the external

Sync clock be set to 20% above the free-running frequency. If not used,

this pin can be left floating.

9

Vin

Input voltage for Internal LDO. A 1.0µF capacitor should be connected

between this pin and PGnd. If external supply is connected to

Vcc/LDO_out pin, this pin should be left floating.

10

VCC

/LDO_out

Input Bias Voltage, output of internal LDO. Place a minimum 2.2µF cap

from this pin to PGnd

11

PGnd

Power Ground. This pin serves as a separated ground for the MOSFET

drivers and should be connected to the system’s power ground plane.

12

SW

Switch node. This pin is connected to the output inductor

13 PVin Input voltage for power stage

14

Boot

Supply voltage for high side driver, a 100nF capacitor should be

connected between this pin and SW pin.

15

Enable

Enable pin to turn on and off the device, if this pin is connected to PVin

pin through a resistor divider, input voltage UVLO can be implemented.

16

Vp

Input to error amplifier for tracking purposes

17

Gnd

Signal ground for internal reference and control circuitry

Rev 1.31

4

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