IR3473M_15 Datasheet, PDF (1/22 Pages) International Rectifier – Compensation Loop not Required

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
Figure 1: IR3473 Basic Application Circuit
EFFICIENCY
90%
85%
80%
75%
VIN = 19V
70%
VIN = 12V
65%
VIN = 8V
60%
55%
50%
45%
0.01
0.1
1
10
Load Current (A)
Figure 2: IR3473 Efficiency
1 March 27, 2013 | V2.2 | PD97601