IR3899 datasheet(1/43 Pages) IRF

Part #	IR3899

Description	9A HIGHLY INTEGRATED SUPLRBUCK

PDF	43 Pages

Scroll/Zoom	100%

Manufacturer	IRF [International Rectifier]

Direct Link	http://www.irf.com

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August 08, 2012 |DATA SHEET | 3.4

1

IR3899

9A Highly Integrated SupIRBuck

TM

Single‐Input Voltage, Synchronous Buck Regulator

PD‐97661

78

80

82

84

86

88

90

92

94

96

98

0.9

1.8

2.7

3.6

4.5

5.4

6.3

7.2

8.1

9

Load Current (A)

1.2Vout

3.3Vout

12Vin,Internal bias,Frequency 600KHz

FEATURES

 Single 5V to 21V application

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

external Vcc

 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

hiccup mode over current protection

 Smart internal LDO to improve light load and full

load efficiency

 External Synchronization with Smooth Clocking

 Enhanced Pre‐Bias Start‐Up

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

margining capability

 Vp for Tracking Applications (Source/Sink Capability

+/‐9A)

 Integrated MOSFET drivers and Bootstrap Diode

 Thermal Shut Down

 Programmable Power Good Output with tracking

capability

 Monotonic Start‐Up

 Operating temp: ‐40oC < Tj < 125oC

 Small Size: 4mm x 5mm PQFN

 Lead‐free, Halogen‐free and RoHS Compliant

BASIC APPLICATION

Figure 1: IR3899 Basic Application Circuit

DESCRIPTION

The IR3899 SupIRBuck

TM is an easy‐to‐use, fully integrated

and highly efficient DC/DC regulator. The onboard PWM

controller and MOSFETs make IR3899 a space‐efficient

solution, providing accurate power delivery.

IR3899 is a versatile regulator which offers programmable

switching frequency and the fixed 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

 Netcom Applications

 Embedded Telecom Systems

 Server Applications

 Storage Applications

 Distributed Point of Load Power Architectures

Figure 2: IR3899 Efficiency

*

* optional

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