INTRODUCTION

The SMB113A/B and SMB117/A are highly integrated and flexible four-channel power managers designed for use in a wide range of applications. The built-in digital programmability allows system designers to custom tailor the device to suit almost any multi-channel power supply application from digital camcorders to set-top boxes. Complete with a user friendly GUI, all programmable settings, including output voltages and input/output voltage monitoring, can be customized with ease.

The SMB113A/B and SMB117/A integrate all the essential blocks required to implement a complete four-channel power subsystem consisting of four synchronous step-down “buck” controllers. Additionally sophisticated power control/monitoring functions required by complex systems are built-in. These

include digitally programmable output voltage set point, power up/down sequencing, enable/disable, dynamic voltage management and UV/OV monitoring on all channels.

? Digital programming of all major parameters via I2C interface and non-volatile memory

? Output voltage set point

? Input/battery voltage monitoring

? Output power-up/down sequencing

? Digital soft-start and output slew rate

? Dynamic voltage control of all outputs

? UV/OV monitoring of all outputs

? Enable/Disable outputs independently

? User friendly Graphical User Interface (GUI)

? Four synchronous step-down output channels

? Integrated RESET monitor

? +2.7V to +6.0V Input Range

? Highly accurate output voltage: <1.5

? Factory programmable dead times

? 0 to 100 Duty Cycle operation

? Undervoltage Lockout (UVLO) with hysteresis

? 250kHz (SMB117A), 400kHz (SMB117), 800kHz (SMB113A), 1MHz (SMB113B) operating frequency

? 96 bytes of user configurable nonvolatile memory

Applications

? Car & Marine Navigation Systems

? Set-top Boxes

? TVs

? DDR Memory

? Mobile Computing/PDAs

? Office Equipment

? DMB Systems

FEATURES & APPLICATIONS