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TPS53014DGS Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza TPS53014DGS
Descripción Electrónicos  Single Synchronous Step-down Controller for Low Voltage Power Rails
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS53014DGS Datasheet(HTML) 6 Page - Texas Instruments

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VIN
VIN
EN
VOUT
EN
VFB
VREG5
SS
VIN
TPS53014
SW
DRVL
DRVH
VBST
PGND
SGND
PGND
1
2
3
4
5
6
7
8
9
10
UV
OV
UVLO
TSD
EN
LOGIC
SS LOGIC
PROTECTION
LOGIC
OCL
SW
6.4µA
10µA
1
SHOT
CONTROL
LOGIC
VREG5
VREG5
XCON
REF
VREG5
UVLO
REF
-32%
+20%
+
+
+
+
+
-
-
-
-
SS
REF
SGND
PGND
UV
OV
ADC
TPS53014
SLVSBF1 – MAY 2012
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
OVERVIEW
The TPS53014 is single synchronous step-down (buck) controller. It operates using D-CAP2™ mode control.
The fast transient response of D-CAP2™ control reduces the required amount of output capacitance to meet a
specific level of performance. Proprietary internal circuitry allows the use of low ESR output capacitors including
ceramic and special polymer types.
DETAILED DESCRIPTION
PWM OPERATION
The main control loop of the TPS53014 is an adaptive on-time pulse width modulation (PWM) controller that
supports a proprietary D-CAP2™ control mode. D-CAP2™ control combines constant on-time control with an
internal compensation circuit for pseudo-fixed frequency and low external component count configuration with
both low ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output. At the
beginning of each cycle, the high-side MOSFET is turned on. this MOSFET is turned off when the internal timer
expires. This timer is set by the converter input voltage VIN, and the output voltage VO, to maintain a pseudo-
fixed frequency over the input voltage range, hence it is called adaptive on-time control. The timer is reset and
the high-side MOSFET is turned on again when the feedback voltage falls below the nominal output voltage. An
internal ramp is added to the reference voltage to simulate output ripple, eliminating the need for ESR induced
output ripple from D-CAP2™ mode control.
6
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s) :TPS53014


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