15A Highly Integrated SupIRBuck
TM
IR3477
FEATURES
•
Input Voltage Range: 3V to 27V
•
Output Voltage Range: 0.5V to 12V
•
Continuous 15A Load Capability
•
Constant On‐Time 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, +/‐1%)
•
Enable Input with Voltage Monitoring Capability
•
Pre‐bias 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 SupIRBuck
TM
is an easy‐to‐use, fully integrated
and highly efficient DC/DC voltage regulator. The onboard
constant on time hysteretic controller and MOSFETs make
IR3477 a space‐efficient 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 pre‐bias 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 – STB, LCD, TV, Printers
•
12V and 24V Distributed Power Systems
•
General Purpose POL DC‐DC Converters
•
Game Consoles and Graphics Cards
BASIC APPLICATION
EFFICIENCY
95%
85%
Efficiency
75%
65%
55%
45%
0.01
19VIN
12VIN
8VIN
0.1
Figure 1: IR3477 Basic Application Circuit
1
10
Load Current (A)
100
Figure 2: IR3477 Efficiency
1
March 27, 2013 | V2.5 | PD97604
IRF [ INTERNATIONAL RECTIFIER ]
