TPS51117_15 Datasheet, PDF (1/33 Pages) Texas Instruments – TPS51117 Single Synchronous Step-Down Controller

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TPS51117
SLVS631C – DECEMBER 2005 – REVISED MAY 2015
TPS51117 Single Synchronous Step-Down Controller
1 Features
•1 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
• Powergood Signal
• Internal 1.2-ms Voltage Soft-Start
• Integrated Output Discharge (Soft-Stop)
2 Applications
• Notebook Computers
• I/O Supplies
• System Power Supplies
3 Description
The TPS51117 device is a cost-effective,
synchronous buck controller for POL voltage
regulation in notebook PC applications. The controller
is dedicated for the operation of the Adaptive On-
Time D-CAP mode. This mode provides ease-of-use,
low external component count, and fast transient
response. Auto-skip mode for high efficiency down to
the milliampere 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 VQFN or a 14-
pin TSSOP package and is specified from –40°C to
85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS51117
TSSOP (14)
VQFN (14)
4.40 mm × 5.00 mm
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
+5V +
Typical Application Circuit
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
C2
Q1
L1
R1
Q2
R2
GND
VIN
+ _1.8V~28V
VOUT
+ _0.75V~5.5V
C1
- PGND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.