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TPS62238DRYR Datasheet(PDF) 10 Page - Texas Instruments

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No. de Pieza. TPS62238DRYR
Descripción  2-MHz and 3-MHz Ultra Small Step-Down Converter in 1 x 1.5 USON Package
Descarga  40 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62238DRYR Datasheet(HTML) 10 Page - Texas Instruments

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Gate Driver
Anti
Shoot-Through
Current
Limit Comparator
SW
Softstart
Bandgap
Undervoltage
Lockout
Limit
High Side
Limit
Low Side
FB
EN
MODE
VIN
GND
Min. On Time
Min. OFF Time
VIN
EN
Integrated
Feed Back
Network
VREF
FB
Error
Comparator
Zero/Negative
Current Limit Comparator
Control
Logic
PMOS
NMOS
MODE
Thermal
Shutdown
VREF
0.70 V
Copyright © 2016, Texas Instruments Incorporated
10
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318, TPS622319
SLVS941G – APRIL 2009 – REVISED AUGUST 2016
www.ti.com
Product Folder Links: TPS62230 TPS62231 TPS62232 TPS62233 TPS62234 TPS62235 TPS62236 TPS62237
TPS62238 TPS62239 TPS622310 TPS622311 TPS622312 TPS622313 TPS622314 TPS622315 TPS622316
TPS622317 TPS622318 TPS622319
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Copyright © 2009–2016, Texas Instruments Incorporated
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Undervoltage Lockout
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions. The TPS6223x devices
have a UVLO threshold set to 1.8 V (typical). Fully functional operation is permitted for input voltage down to the
falling UVLO threshold level. The converter starts operation again once the input voltage trips the rising UVLO
threshold level.
8.3.2 Enable and Shutdown
The device starts operation when EN is set high and starts up with the soft-start as previously described. For
proper operation, the EN pin must be terminated and must not be left floating, except for the TPS622319, which
has an integrated 1MΩ always active pull-down resistor.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1 μA. In
this mode, the P- and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off.
The EN input can be used to control power sequencing in a system with various DC – DC converters. The EN
pin can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of
supply rails.
8.3.3 Thermal Shutdown
As soon as the junction temperature, TJ, exceeds 150°C (typical) the device goes into thermal shutdown. In this
mode, the high-side and low-side MOSFETs are turned off. The device continues its operation when the junction
temperature falls below the thermal shutdown hysteresis.


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