TPS51222RTVR ,Fixed-Frequency, 99% Duty Cycle Peak Current-Mode Notebook System Power Controller 32-WQFN -40 to 85FEATURES2• Input Voltage Range: 4.5 V to 32 V APPLICATIONS• Notebook Computer System and I/O Bus• O ..
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TPS51222RTVR
Fixed-Frequency, 99% Duty Cycle Peak Current-Mode Notebook System Power Controller
1FEATURES
APPLICATIONS
DESCRIPTIONTPS51222RTV
VIN
VREG3
EN2
DRVH1
V5SW
EN1
PGOOD1
SKIPSEL1
CSP1
PGOOD2
SKIPSEL2
CSP2
CSN22627283031321514
DRVH2
SKIPSEL2
PGOOD2
EN2
VREG3
3.3 V/
10 mA
VBAT
SKIPSEL1
EN1
VO1
5 V
VBAT IMON2
VO2
3.3 V
VBAT
VREG5
5 V/
100 mA
UDG-09009
VO2
TPS51222
www.ti.com............................................................................................................................................................................................... SLUS908–JANUARY 2009
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller Input Voltage Range: 4.5Vto32V Notebook Computer System and I/O Bus•
Output Voltage Range:1Vto12V Pointof Loadin LCD TV, MFP•
Selectable Light Load Operation
(Continuous/ Auto Skip/ Out-Of-Audio™ Skip) Programmable Droop CompensationThe TPS51222isa dual synchronous buck regulator•
Voltage Servo Adjustable Soft Start controller with two LDOs.Itis optimized for 5-V/3.3-V•
200-kHzto 1-MHz Fixed-Frequency PWM system controller, enabling designers to cost•
Current Mode Architecture effectively complete 2-cellto 4-cell notebook system
power supply. The TPS51222 supports high•
180° Phase Shift Between Channelsefficiency, fast transient response, and 99% duty•
Resistoror Inductor DCR Current Sensing cycle operation.It supports supply input voltage•
Current Monitor Output for Each Channel ranging from 4.5Vto32V, and output voltages fromVto 12 V. Peak current mode supports stability•
Adaptive Zero Crossing Circuitoperation with lower ESR capacitor and output•
Powergood Output for Each Channel accuracy. The high duty cycle (99%) operation and•
OCL/OVP/UVP/UVLO Protections the wide input/output voltage range supports flexible•
Thermal Shutdown (Non-Latch) design for small mobile PCs anda wide varietyof
other applications. The fixed frequency can be•
Output Discharge Function adjusted from 200 kHzto1 MHz bya resistor, and•
Integrated Boot Strap MOSFET Switch each channel runs 180° out-of-phase. The TPS51222•
QFN-32 (RTV) Package can also synchronizeto the external clock, and the
interleaving ratio can be adjusted by its duty. The
TPS51222is available in the 32-pin5×5 QFN
package andis specified from –40°Cto 85°C.
