IR3477
IR3477 is 15A Highly Integrated SupIRBuck manufactured by International Rectifier.
FEATURES
- Input Voltage Range: 3V to 27V
- Output Voltage Range: 0.5V to 12V
- Continuous 15A Load Capability
- Constant On‐Time Control
- pensation Loop not Required
- Excellent Efficiency at Very Low Output Currents
- Programmable Switching Frequency and Soft Start
- Thermally pensated 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 Sup IRBuck 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 pensated 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 puters
- 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
Figure 1: IR3477 Basic Application Circuit
1 10 Load Current (A)
Figure 2: IR3477 Efficiency
March 27, 2013 | V2.5 | PD97604...
