6A Highly Integrated SupIRBuck
TM
IR3473
FEATURES
•
Input Voltage Range: 3V to 27V
•
Output Voltage Range: 0.5V to 12V
•
Continuous 6A 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
•
Very Small, Low Profile 4mm x 5mm QFN Package
DESCRIPTION
The IR3473 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
IR3473 a space‐efficient solution that delivers up to 6A 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
90%
85%
80%
Efficiency
75%
70%
65%
60%
55%
50%
45%
0.01
0.1
1
Load Current (A)
10
VIN = 19V
VIN = 12V
VIN = 8V
Figure 1: IR3473 Basic Application Circuit
Figure 2: IR3473 Efficiency
1
March 27, 2013 | V2.2 | PD97601
IRF [ INTERNATIONAL RECTIFIER ]
