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.