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FEATURES

? Voltage Mode Control

? Fully Integrated MOSFET Switches

? 2.7 V to 6 V Input Voltage Range

? Programmable PWM/PSM Control

- Up to 1 A Output Current at 3.6 V in PWM

- Up to 2 MHz Adjustable Switching Frequency in PWM

- Less than 200 μA Quiescent Current in PSM

? Integrated UVLO and POR

? Integrated Soft-Start

? Synchronization

? Shutdown Current < 1 μA

DESCRIPTION

The Si9169 provides fully integrated synchronous buck or

boost converter solution for the latest one cell Lithium Ion

cellular phones. Capable of delivering up to 1 A of output

current at + 3.6 V, the Si9169 provides ample power for

various baseband circuits as well as for some PAs. It

combines the 2 MHz switching controller with fully

integrated high-frequency MOSFETs to deliver the smallest

and most efficient converter available today. The 2 MHz

switching frequency reduces the inductor height to new

level of 2 mm and minimizes the output capacitance

requirement to less than 10 μF with peak-to-peak output

ripple as low as 10 mV. Combined with low-gate charge

high-frequency MOSFETs, the Si9169 delivers efficiency up

to 95 . The programmable pulse skipping mode maintains

this high efficiency even during the standby and idle modes

to increase overall battery life and talktime. In order to

extract the last ounce of power from the battery, the Si9169

is designed with 100 duty cycle control for buck mode.

With 100 duty cycle, the Si9169 operates like a saturated

linear regulator to deliver the highest potential output

voltage for longer talktime.

Si9169 can be a drop-in replacement of Si9165 provided Pin

1 is not connected. For full 1 A load condition, Pin 1 is

required to be connected to low power controller ground.

The Si9169 is available in lead (Pb)-free TSSOP-20 pin

package. In order to satisfy the stringent ambient

temperature requirements, the Si9169 is rated to handle the

industrial temperature range of - 25 °C to 85 °C and - 40 °C

to 85 °C.