TPS51220A_16 Datasheet, PDF (1/51 Pages) Texas Instruments – Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

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TPS51220A
SLUS897E – DECEMBER 2008 – REVISED JANUARY 2013
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
Check for Samples: TPS51220A
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
• Selectable Current/ D-CAP™ Mode
Architecture
• 180° Phase Shift Between Channels
• Resistor or Inductor DCR Current Sensing
• Adaptive Zero Crossing Circuit
• Powergood Output for Each Channel
• OCL/OVP/UVP/UVLO Protections
(OVP Disable Option)
• Thermal Shutdown (Non-Latch)
• Output Discharge Function (Disable Option)
• Integrated Boot Strap MOSFET Switch
• QFN-32 (RTV/RSN) Package
APPLICATIONS
• Notebook Computer System and I/O Bus
• Point of Load in LCD TV, MFP
DESCRIPTION
The TPS51220A 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 TPS51220A 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. Two types of control
schemes can be chosen depending on the application. Peak current mode supports stability operation with lower
ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (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 TPS51220A can also synchronize to the external clock, and the interleaving
ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5×5/4×4 QFN package and is
specified from –40°C to 85°C.
TYPICAL APPLICATION CIRCUIT
VO1
5.0V
VBAT
L1
C11
PGND
Q11
C12
PGND
Q12
PGND
VO1
R01
VREG5
5V/100mA
C01
C14
C24
PGND
PGND
GND
32 31 30 29 28 27 26 25
1 _DRVH1
2 V5SW
3 RF
24
DRVH2
VIN 23
VREG3 22
GND EN1
PGOOD1
4 EN1
5 PGOOD1
TPS51220A
(QFN32)
EN2 21
PGOOD2 20
SKIPSEL1
R14
6 SKIPSEL1
7
C13
8
CSP1
CSN1
PowerPAD
SKIPSEL2 19
CSP2 18
CSN2 ₁₇
VBAT
Q21
C22
L2
PGND
Q22
C21
PGND
PGND
VO2
3.3V
C03
EN2
PGOOD2
SKIPSEL2
R24
GND
C23
VBAT
VREG3
3.3V/10mA
EN
VO1
GND
R11
R12
GND
9 10 11 12 13 14 15 16
R23
R21
R13
GND
C 02
GND
R22
GND
VREG5
VO2
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, D-CAP, 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 © 2008–2013, Texas Instruments Incorporated