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TPS62162-Q1 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza TPS62162-Q1
Descripción Electrónicos  3-V to 17-V 1-A Step-Down Converter with DCS-Control
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62162-Q1 Datasheet(HTML) 8 Page - Texas Instruments

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background image
control logic
Soft
start
Thermal
Shtdwn
UVLO
PG control
power
control
error
amplifier
gate
drive
HS lim
LS lim
VIN
PG
PGND
AGND
comp
comp
+
_
timer tON
DCS - Control
TM
direct control
&
compensation
comparator
ramp
SW
EN
*
VOS
FB
*
* This pin is connected to a pull down resistor internally
(see Detailed Description section).
Copyright ã 2016, Texas Instruments Incorporated
8
TPS62160-Q1, TPS62162-Q1
SLVSCK6A – DECEMBER 2014 – REVISED NOVEMBER 2016
www.ti.com
Product Folder Links: TPS62160-Q1 TPS62162-Q1
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Functional Block Diagram (continued)
Figure 6. TPS62162-Q1 (Fixed Output Voltage)
9.3 Feature Description
9.3.1 Enable / Shutdown (EN)
When Enable (EN) is set High, the device starts operation.
Shutdown is forced if EN is pulled Low with a shutdown current of typically 1.8 µA. During shutdown, the internal
power MOSFETs as well as the entire control circuitry are turned off. The internal resistive divider pulls down the
output voltage smoothly. If the EN pin is Low, an internal pull-down resistor of about 400 kΩ is connected and
keeps it Low in case of floating pin.
Connecting the EN pin to an appropriate output signal of another power rail provides sequencing of multiple
power rails.
9.3.2 Softstart
The internal soft start circuitry controls the output voltage slope during startup. This avoids excessive inrush
current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drops from high-
impedance power sources or batteries. When EN is set to start device operation, the device starts switching after
a delay of about 50 µs and VOUT rises with a slope of about 25 mV/µs. See Figure 28 and Figure 29 for typical
startup operation.


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