TPS51219 Datasheet, PDF (1/36 Pages) Texas Instruments – High Performance, Single-Synchronous Step-Down Controller with Differential Voltage Feedback

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TPS51219
SLUSAG1B – MARCH 2011 – REVISED OCTOBER 2011
High Performance, Single-Synchronous Step-Down Controller
with Differential Voltage Feedback
FEATURES
1
•23 Differential Voltage Feedback
• DC Compensation for Accurate Regulation
• Wide Input Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.5 V to 2.0 V with
Fixed Options of 1.05 V and 1.00 V
• Wide Output Load Range: 0 A to 20 A+
• Adaptive On-Time Modulation with Selectable
Control Architecture and Frequency
– D-CAP™ Mode at 300 kHz/400 kHz for Fast
Transient Response
– D-CAP2™ Mode at 500 kHz/670 kHz for
Ceramic Output Capacitor
• 4700 ppm/°C, Low-Side R_DS(on) Current Sensing
• R_SENSE Accurate Current Sense Option
• Internal, 1-ms Voltage Servo Softstart
• Built-In Output Discharge
• Power Good Output
• Integrated Boost Switch
• Built-In OVP/UVP/OCP
• Thermal Shutdown (Non-latched)
• 3 mm × 3 mm, 16-Pin, QFN (RTE) Package
APPLICATIONS
• Notebook Computers
• I/O Supplies
DESCRIPTION
The TPS51219 is a small-sized single buck controller
with adaptive on-time control. It provides a choice of
control modes (D-CAP™ or D-CAP2™) to meet a
wide range of system requirements. It is designed for
tight DC regulation requirements such as the VCCIO
application for Intel^® notebooks. The performance
and flexibility of the TPS51219 makes it suitable for
low output voltage, high current, PC system power
rails and similar point-of-load (POL) power supplies.
Differential voltage feedback and the voltage
compensation function combine to provide high
precision power to load devices.
A small package, fixed voltage options and minimal
external component count saves cost and space,
while a dedicated EN pin and pre-set frequency
selections minimize design effort. The skip-mode at
light load condition, strong gate drivers, and low-side
FET R_DS(on) current sensing provides high efficiency
operation over a broad load range. The external
resistor current sense option enables accurate
current sensing. The conversion input voltage (the
high-side FET drain voltage) ranges from 3 V to 28 V
and output voltage ranges from 0.5 V to 2.0 V. The
device requires an external 5-V supply.
The TPS51219 is available in a 16-pin, QFN package
and is specified for ambient temperature from -40°C
to 85°C.
V
IN
V5IN
PGOOD
EN
16 15 14
13
GSNS
1 VREF
2 REFIN
3 GSNS
TPS51219RTE
SW 12
DH 11
V5 9
V
OUT
VSNS
4 VSNS
DL 10
56
7
8
UDG-11006
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.
D-CAP, D-CAP2 are trademarks of Texas Instruments.
2
Intel is a registered trademark of Intel.
3
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 © 2011, Texas Instruments Incorporated