FEATURES

Buck or Boost Configuration

Voltage Mode Control

2.7-V to 6-V Input Voltage Range for VDD and VS

Programmable PWM/PSM Control

− Up to 2-MHz Switching Frequency in PWM

− Synchronous Rectification in PWM

− Less than 200-
A IDD in PSM

Integrated UVLO and POR

Integrated Soft-Start

Synchronization

Shutdown Current <1
A

DESCRIPTION

The Si9166 is a programmable topology controller for today’s

continuous changing portable electronic market. Si9166

provides flexibility of utilizing various battery configurations

and chemistries such as NiCd, NiMhy, or Li+ with input voltage

range of 2.7 V to 6 V. An additional flexibility is provided with

topology programmability to power multiple loads such as

power amplifiers, microcontrollers, or baseband logic IC’s.

The converters can be programmed to be synchronous Buck

or Boost topology. For ultra-high efficiency, converters are

designed to operate in synchronous rectified PWM mode

under full load while transforming into externally controlled

pulse skipping mode (PSM) under light load. All these features

are provided by the Si9166 without sacrificing system

integration requirements of fitting these circuits into ever

demanding smaller and smaller space. The Si9166 is capable

of switching up to 2 MHz to minimize the output inductor and

capacitor size in order to decrease the overall converter size.

The Si9166 is available in both standard and lead (Pb)-free

TSSOP-16 pin packages and specified to operate over the

industrial temperature range of −25C to 85C.