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IR3898 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 IR3898
部品説明 6A Highly Integrated SupIRBuck Synchronous Buck Regulator
メーカ International Rectifier
ロゴ International Rectifier ロゴ 



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IR3898 Datasheet, IR3898 PDF,ピン配置, 機能
6A Highly Integrated SupIRBuckTM
Single-Input Vo- l1ta-ge, Synchronous Buck Regulator
PD-97662
IR3898
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
+/-6A)
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
DESCRIPTION
The IR3898 SupIRBuckTM is an easy-to-use, fully
integrated and highly efficient DC/DC regulator.
The onboard PWM controller and MOSFETs make
IR3898 a space-efficient solution, providing accurate
power delivery.
IR3898 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
BASIC APPLICATION
5V <Vin<21V
PGood
Vp
Vref S_Ctrl Vin PVin Boot
Vcc/
LDO_out
SW
PGood IR3898
Vp
Vsns
Rt/Sync
Fb
Enable
Gnd
Comp
PGnd
Vo
Figure 1: IR3898 Basic Application Circuit
98
96
94
92
90
88
86
84
82
80 12Vin,Internal bias,Frequency 600KHz
78
0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4
Load Current (A)
1.2Vout 3.3Vout
6
Figure 2:IR3898 Efficiency
1 JANURARY 18, 2013 | DATA SHEET | Rev 3.5

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