The OC5840 is a 3A highly integrated, high-efficiency synchronous rectification step-down converter with a wide input voltage range of 4.5V~35V. The OC5840 integrates a high-side 90mΩ MOSFET and a low-side 60mQ MOSFET.
The OC5840’s two modes of operation, fixed-frequency PWM peak current control and light-load PFM skip-cycle mode, allow the system to operate efficiently over a fairly wide range of output current loads.
The OC5840 has an adjustable soft-start time setting, which is achieved by an external SS capacitor. The operating frequency is set by an external RT to ground resistor.
The OC5840 is available in an ESOP8 package with few external components and a base heatsink grounded.

Features
Up to 96% Efficiency (@VOUT=5V)
The operating frequency is externally adjustable
3A output current
There is no need for Schottky diodes
4.5V~35V input voltage range
0.8V reference voltage
Fixed frequency peak current mode with excellent linear and load transient response
Thermal shutdown
Overshoot current limit and programmable soft-start time
Precise EN thresholds can be used for UVLO thresholds and hysteresis control
Available in an ESOP8 package

Applications
Distributed power systems
Digital set-top boxes, flat-screen TVs and monitors, laptops, wireless and DSL modems