IR3897

更新时间： 2024-09-16 11:58:59

品牌	Logo	应用领域
英飞凌 - INFINEON		/
页数	文件大小	规格书
45页	2541K
描述
4A HIGHLY INTEGRATED SUPLRBUCK

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IR3897 数据手册

‐

97663

4A Highly Integrated SupIRBuck^TM

IR3897

Single‐Input Voltage, Synchronous Buck Regulator

- 1 -

FEATURES

DESCRIPTION

integrated and highly efficient DC/DC regulator.

The onboard PWM controller and MOSFETs make

IR3897 a space‐efficient solution, providing accurate

power delivery.

The IR3897 SupIRBuck^TMis an easy‐to‐use, fully

 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

IR3897 is a versatile regulator which offers

programmability of switching frequency and internal

current limit while operates in wide input and output

voltage range.

 Enable input with Voltage Monitoring Capability

The switching frequency is programmable from 300kHz

to 1.5MHz for an optimum solution.

 Thermally Compensated Current Limit with robust

hiccup mode over current protection

 Smart Internal LDO to improve light load and full load

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.

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

+/‐4A)

APPLICATIONS

 Netcom Applications

 Integrated MOSFET drivers and Bootstrap Diode

 Thermal Shut Down

 Embedded Telecom Systems

 Server Applications

 Programmable Power Good Output with tracking

 Storage Applications

capability

 Distributed Point of Load Power Architectures

 Monotonic Start‐Up

 Operating temp: ‐40^oC < Tj < 125^oC

 Small Size: 4mm x 5mm PQFN

 Lead‐free, Halogen‐free and RoHS Compliant

BASIC APPLICATION

12Vin,Internal bias,Frequency 600KHz

2.4 2.8 3.2 3.6 4

0.4

0.8

1.2

1.6

Load Current (A)

* optional

1.2Vout

3.3Vout

Figure 2:IR3897 Efficiency

Figure 1: IR3897 Basic Application Circuit

AUGUST 08, 2012 |DATA SHEET | Rev 3.3

12 3 4 5 6 7...45

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