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IR3897 Datasheet(PDF) 1 Page - International Rectifier

Part # IR3897
Description  4A HIGHLY INTEGRATED SUPLRBUCK
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3897 Datasheet(HTML) 1 Page - International Rectifier

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AUGUST 08, 2012 |DATA SHEET |    Rev 3.3
1
IR3897 
4A Highly Integrated SupIRBuck
TM  
Single‐Input Voltage, Synchronous Buck Regulator  
PD‐97663
73
75
77
79
81
83
85
87
89
91
93
95
97
0.4
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
4
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  
+/‐4A) 
 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: IR3897 Basic Application Circuit                                       
DESCRIPTION 
The IR3897 SupIRBuck
TM is an easy‐to‐use, fully 
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 
 Netcom Applications 
 Embedded Telecom Systems 
 Server Applications 
 Storage Applications 
 Distributed Point of Load Power Architectures 
 
 
 
 
Figure 2:IR3897 Efficiency 
*
*
* optional 


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