TPS51222 Datasheet, PDF (1/42 Pages) Texas Instruments – Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

TPS51222
www.ti.com............................................................................................................................................................................................... SLUS908 – JANUARY 2009
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
FEATURES
1
•2 Input Voltage Range: 4.5 V to 32 V
• Output Voltage Range: 1 V to 12 V
• Selectable Light Load Operation
(Continuous / Auto Skip / Out-Of-Audio™ Skip)
• Programmable Droop Compensation
• Voltage Servo Adjustable Soft Start
• 200-kHz to 1-MHz Fixed-Frequency PWM
• Current Mode Architecture
• 180° Phase Shift Between Channels
• Resistor or Inductor DCR Current Sensing
• Current Monitor Output for Each Channel
• Adaptive Zero Crossing Circuit
• Powergood Output for Each Channel
• OCL/OVP/UVP/UVLO Protections
• Thermal Shutdown (Non-Latch)
• Output Discharge Function
• Integrated Boot Strap MOSFET Switch
• QFN-32 (RTV) Package
APPLICATIONS
• Notebook Computer System and I/O Bus
• Point of Load in LCD TV, MFP
DESCRIPTION
The TPS51222 is a dual synchronous buck regulator
controller with two LDOs. It is optimized for 5-V/3.3-V
system controller, enabling designers to cost
effectively complete 2-cell to 4-cell notebook system
power supply. The TPS51222 supports high
efficiency, fast transient response, and 99% duty
cycle operation. It supports supply input voltage
ranging from 4.5 V to 32 V, and output voltages from
1 V to 12 V. Peak current mode supports stability
operation with lower ESR capacitor and output
accuracy. The high duty cycle (99%) operation and
the wide input/output voltage range supports flexible
design for small mobile PCs and a wide variety of
other applications. The fixed frequency can be
adjusted from 200 kHz to 1 MHz by a resistor, and
each channel runs 180° out-of-phase. The TPS51222
can also synchronize to the external clock, and the
interleaving ratio can be adjusted by its duty. The
TPS51222 is available in the 32-pin 5 × 5 QFN
package and is specified from –40°C to 85°C.
VBAT
VREG5
5 V/
100 mA
VO1
5V
EN
IMON1
VO1
VO1
EN1
PGOOD1
SKIPSEL1
32 31 30 29 28 27 26 25
1 DRVH1
DRVH2 24
2 V5SW
VIN 23
3 RF
VREG3 22
4 EN1
5 PGOOD1
TPS51222RTV
EN2 21
PGOOD2 20
6 SKIPSEL1
SKIPSEL2 19
7 CSP1
CSP2 18
8 CSN1
CSN2 17
9 10 11 12 13 14 15 16
VBAT
EN2
PGOOD2
SKIPSEL2
VBAT
VO2
3.3 V
VREG3
3.3 V/
10 mA
IMON2
VO2
UDG-09009
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Out-Of-Audio, PowerPAD are trademarks of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated