August 6, 2012 | ADVANCED DATASHEET | V2.4 | PD97604
1
IR3477
15A Highly Integrated SupIRBuckTM
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
BASIC APPLICATION
Figure 1: IR3477 Basic Application Circuit
DESCRIPTION
The IR3477 SupIRBuckTM 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
EFFICIENCY
45%
55%
65%
75%
85%
95%
0.01 0.1 1 10 100
Load Current (A)
Efficiency
12VIN
8VIN
19VIN
Figure 2: IR3477 Efficiency
August 6, 2012 | ADVANCED DATASHEET | V2.4 | PD97604
2
IR3477
15A Highly Integrated SupIRBuckTM
ORDERING INFORMATION
IR3477 ―
MARKING INFORMATION
Package
Tape & Reel Qty
Part Number
M
750
IR3477MTR1PBF
M
4000
IR3477MTRPBF
PIN DIAGRAM
WC
WC
o
PCBJ
o
JA
/2
/30
-
PBF – Lead Free
TR – Tape and Reel
M – Package Type
3477M
?YWW?
xxxxx
Site/Date/Marking Code
Lot Code
Pin 1 Identifier
August 6, 2012 | ADVANCED DATASHEET | V2.4 | PD97604
3
IR3477
15A Highly Integrated SupIRBuckTM
FUNCTIONAL BLOCK DIAGRAM
Figure 3: IR3477 Functional Block Diagram
