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IR3477 Datasheet, PDF (1/21 Pages) International Rectifier – 15A Highly Integrated SupIRBuck Constant On.Time Control | |||
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15A Highly Integrated SupIRBuckTM
IR3477
FEATURES
⢠Input Voltage Range: 3V to 27V
⢠Output Voltage Range: 0.5V to 12V
⢠Continuous 15A Load Capability
⢠Constant OnâTime Control
⢠Compensation Loop not Required
⢠Excellent Efficiency at Very Low Output Currents
⢠Programmable Switching Frequency and Soft Start
⢠Thermally Compensated Over Current Protection
⢠Power Good Output
⢠Precision Voltage Reference (0.5V, +/â1%)
⢠Enable Input with Voltage Monitoring Capability
⢠Preâbias Start Up
⢠Thermal Shut Down
⢠Under/Over Voltage Fault Protection
⢠Forced Continuous Conduction Mode Option
⢠Small, Low Profile 5mm x 6mm QFN Package
DESCRIPTION
The IR3477 SupIRBuckTM is an easyâtoâuse, fully integrated
and highly efficient DC/DC voltage regulator. The onboard
constant on time hysteretic controller and MOSFETs make
IR3477 a spaceâefficient solution that delivers up to 15A of
precisely controlled output voltage.
Programmable switching frequency, soft start, and
thermally compensated over current protection allows for
a very flexible solution suitable for many different
applications and an ideal choice for battery powered
applications.
Additional features include preâbias startup, very precise
0.5V reference, under/over voltage shutdown, thermal
protection, power good output, and enable input with
voltage monitoring capability.
APPLICATIONS
⢠Notebook and Desktop Computers
⢠Consumer Electronics â STB, LCD, TV, Printers
⢠12V and 24V Distributed Power Systems
⢠General Purpose POL DCâDC Converters
⢠Game Consoles and Graphics Cards
BASIC APPLICATION
Figure 1: IR3477 Basic Application Circuit
EFFICIENCY
95%
85%
75%
65%
55%
19VIN
12VIN
8VIN
45%
0.01
0.1
1
10
100
Load Current (A)
Figure 2: IR3477 Efficiency
1 March 27, 2013 | V2.5 | PD97604
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