IR3476M_15 Datasheet, PDF (1/21 Pages) International Rectifier – Compensation Loop not Required

12A Highly Integrated SupIRBuck^TM
IR3476
FEATURES
• Input Voltage Range: 3V to 27V
• Output Voltage Range: 0.5V to 12V
• Continuous 12A 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 IR3476 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
IR3476 a space‐efficient solution that delivers up to 12A 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: IR3476 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: IR3476 Efficiency
1 March 27, 2013 | V2.2 | PD97603