IR3899_13 Datasheet, PDF (1/45 Pages) International Rectifier – 9A Highly Integrated SupIRBuck Single.Input Voltage

9A Highly Integrated SupIRBuck^TM
Single‐Input Vo_- l₁ta_-ge, Synchronous Buck Regulator
PD‐97661
IR3899
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: ‐40^oC < Tj < 125^oC
 Small Size: 4mm x 5mm PQFN
 Lead‐free, Halogen‐free and RoHS Compliant
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
BASIC APPLICATION
Figure 1: IR3899 Basic Application Circuit
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94
92
90
88
86
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82
80
12Vin,Internal bias,Frequency 600KHz
78
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
Figure 2: IR3899 Efficiency
1 JANUARY 18, 2013 |DATA SHEET | 3.6