SI9169 Datasheet, PDF (1/8 Pages) Vishay Siliconix – High Frequency 1-A Synchronous Buck/Boost Converter

Si9169
Vishay Siliconix
High Frequency 1-A Synchronous Buck/Boost Converter
FEATURES
D Voltage Mode Control
D Fully Integrated MOSFET Switches
D 2.7-V to 6-V Input Voltage Range
D Programmable PWM/PSM Control
− Up to 1-A Output Current @ 3.6 V in PWM
− Up to 2-MHz Adjustable Switching Frequency in PWM
− Less than 200-mA Quiescent Current in PSM
D Integrated UVLO and POR
D Integrated Soft-Start
D Synchronization
D Shutdown Current <1 mA
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 mF 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 1A load condition, Pin 1 is required
to be connected to low power controller ground.
The Si9169 is available in both standard and 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 X 6 V
OUTPUT
0X1A
V_DD
MODE
COIL V_O
V_S
V_IN/OUT
FB
SHUTDOWN COMP
PWM/PSM
SYNC
R_OSC
REF
PGND GND
INPUT
2.7 X 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
0X1A
Boost Configuration
Document Number: 70945
S-40695—Rev. D, 19-Apr-04
Buck Configuration
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