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SLVS631B – DECEMBER 2005 – REVISED SEPTEMBER 2009
SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
Check for Samples :TPS51117
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FEATURES
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High Efficiency, Low Power Consumption,
4.5-μA Typical Shutdown Current
Fixed Frequency Emulated
On-Time Control,
Adjustable from 100 kHz to 550 kHz
D-CAP™ Mode with 100-ns Load Step
Response
< 1% Initial Reference Accuracy
Output Voltage Range: 0.75 V to 5.5 V
Wide Input Voltage Range: 1.8 V to 28 V
Selectable Auto-Skip/PWM-Only Operation
Temperature Compensated (4500 ppm/°C)
Low-Side R
DS(on)
Overcurrent Sensing
Negative Overcurrent Limit
Integrated Boost Diode
Integrated OVP/UVP and Thermal Shutdown
Power-Good Signal
Internal 1.2-ms Voltage Softstart
Integrated Output Discharge (Softstop)
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DESCRIPTION
The TPS51117 is a cost effective, synchronous buck
controller for POL voltage regulation in notebook PC
applications. The controller is dedicated for Adaptive
On-Time D-CAP™ Mode operation that provides
ease of use,
low external component count, and fast
transient response. Auto-skip mode for high efficiency
down to the milli-ampere load range, or PWM-only
mode for low noise operation is selectable.
The current sensing scheme for positive overcurrent
and negative overcurrent protection is loss-less
low-side
R
DS(on)
sensing
plus
temperature
compensation. The device receives a 5-V (4.5 V to
5.5 V) supply from another regulator such as the
TPS51120 or TPS51020. The conversion input can
be either VBAT or a 5-V rail, ranging from 1.8 V to
28 V, and the output voltage range is from 0.75 V to
5.5 V.
The TPS51117 is available in a 14-pin QFN or a
14-pin TSSOP package and is specified from –40°C
to 85°C.
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APPLICATIONS
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Notebook Computers
I/O Supplies
System Power Supplies
+5V
+
EN_PSV
R3
2
TPS51117RGY
1
14
+
VIN
1.8V~28V
C4
Q1
13
12
EN_PSV
TON
VOUT
V5FILT
VFB
PGOOD
GND
7
VBST
DRVH
LL
TRIP
V5DRV
DRVL
PGND
8
C2
L1
+
R5
R6
C3
PGOOD
3
R4
11
VOUT
0.75V~5.5V
4
R1
C1
Q2
R2
-
GND
10
5
6
9
PGND
GND
GND
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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 is a trademark of Texas Instruments.
Copyright © 2005–2009, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
