TPS51117RGYR Datasheet, PDF (1/31 Pages) Texas Instruments – SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER

TPS51117
www.ti.com...................................................................................................................................... SLVS631B – DECEMBER 2005 – REVISED SEPTEMBER 2009
SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
Check for Samples :TPS51117
FEATURES
1
•2 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)
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.
APPLICATIONS
• Notebook Computers
• I/O Supplies
• System Power Supplies
+5V +
EN_PSV
TPS51117RGY
1
R3 ^EN_PSV
2 _TON
14
C4
VBST
DRVH ¹³
R5
R6
C3
PGOOD
3 _VOUT
4 _V5FILT
5 _VFB
6 _PGOOD
LL ¹²
R4
TRIP ¹¹
GND
V5DRV ¹⁰
DRVL ⁹
GND
7
PGND
8
GND
VIN
+ _1.8V~28V
Q1
C2
L1
R1
VOUT
+ _0.75V~5.5V
C1
Q2
R2
GND
- PGND
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 is a trademark 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 © 2005–2009, Texas Instruments Incorporated