SI9169_07 Datasheet, PDF (1/10 Pages) Vishay Siliconix – High Frequency 1-A Synchronous Buck/Boost Converter

Si9169
Vishay Siliconix
High Frequency 1-A Synchronous Buck/Boost Converter
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.
FUNCTIONAL BLOCK DIAGRAM
INPUT
2.7 to 6 V
OUTPUT
0 to 1 A
V_DD
MODE
COIL V_O
V_S
V_IN/OUT
FB
SHUTDOWN COMP
PWM/PSM
SYNC
R_OSC
REF
PGND GND
FEATURES
• Voltage Mode Control
• Fully Integrated MOSFET Switches
• 2.7 V to 6 V Input Voltage Range
RoHS
• Programmable PWM/PSM Control
COMPLIANT
- 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
INPUT
2.7 to 6 V
V_S V_IN/OUT
V_O
COIL
V_DD
MODE
PGND
FB
COMP
SHUTDOWN R_OSC
PWM/PSM REF
SYNC _{PGND GND}
OUTPUT
0 to 1 A
Boost Configuration
Document Number: 70945
S-72058-Rev. E, 08-Oct-07
Buck Configuration
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