IR3897 IRF [International Rectifier], IR3897 Datasheet

IR3897

Manufacturer Part Number

IR3897

Description

4A HIGHLY INTEGRATED SUPLRBUCK

Manufacturer

IRF [International Rectifier]

Datasheet

1.IR3897.pdf (45 pages)

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FEATURES

BASIC APPLICATION

 Single 5V to 21V application

 Wide Input Voltage Range from 1.0V to 21V with

 Output Voltage Range: 0.5V to 0.86* Vin

 Enhanced Line/Load Regulation with Feed‐Forward

 Programmable Switching Frequency up to 1.5MHz

 Internal Digital Soft‐Start/Soft‐Stop

 Enable input with Voltage Monitoring Capability

 Thermally Compensated Current Limit with robust

 Smart Internal LDO to improve light load and full load

 External Synchronization with Smooth Clocking

 Enhanced Pre‐Bias Start‐Up

 Precision Reference Voltage (0.5V+/‐0.5%) with

 Vp for Tracking Applications (Source/Sink Capability

 Integrated MOSFET drivers and Bootstrap Diode

 Thermal Shut Down

 Programmable Power Good Output with tracking

 Monotonic Start‐Up

 Operating temp: ‐40

 Small Size: 4mm x 5mm PQFN

 Lead‐free, Halogen‐free and RoHS Compliant

Figure 1: IR3897 Basic Application Circuit

external Vcc

hiccup mode over current protection

efficiency

margining capability

+/‐4A)

capability

AUGUST 08, 2012 |DATA SHEET | Rev 3.3

C < Tj < 125

Single‐Input Voltage, Synchronous Buck Regulator

* optional

- 1 -

4A Highly Integrated SupIRBuck

DESCRIPTION

The IR3897 SupIRBuck

integrated and highly efficient DC/DC regulator.

The onboard PWM controller and MOSFETs make

IR3897 a space‐efficient solution, providing accurate

power delivery.

IR3897 is a versatile regulator which offers

programmability of switching frequency and internal

current limit while operates in wide input and output

voltage range.

The switching frequency is programmable from 300kHz

to 1.5MHz for an optimum solution.

It also features important protection functions, such as

Pre‐Bias startup, thermally compensated current limit,

over voltage protection and thermal shutdown to give

required system level security in the event of fault

conditions.

APPLICATIONS

0.4

 Netcom Applications

 Embedded Telecom Systems

 Server Applications

 Storage Applications

 Distributed Point of Load Power Architectures

0.8

Figure 2:IR3897 Efficiency

1.2

1.6

Load Current (A)

1.2Vout

12Vin,Internal bias,Frequency 600KHz

is an easy‐to‐use, fully

2.4

3.3Vout

2.8

IR3897

3.2

PD‐97663

3.6

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