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TPS6213xA-Q1 Datasheet(PDF) 11 Page - Texas Instruments

Part # TPS6213xA-Q1
Description  3-V to 17-V 3-A Step-Down Converter with DCS-Control
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS6213xA-Q1 Datasheet(HTML) 11 Page - Texas Instruments

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TPS62130A-Q1, TPS62133A-Q1, TPS6213013A-Q1
www.ti.com
SLVSCC2B – MAY 2014 – REVISED NOVEMBER 2016
Product Folder Links: TPS62130A-Q1 TPS62133A-Q1 TPS6213013A-Q1
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Feature Description (continued)
(1)
Maximum allowed voltage is 7V. Therefore it's recommended to connect it to VOUT, not VIN.
Using a very small capacitor (or leaving SS/TR pin un-connected) provides fastest startup behavior. The
TPS6213xA-Q1 can start into a pre-biased output. During monotonic pre-biased startup, both of the power
MOSFETs are not allowed to turn on until the device's internal ramp sets an output voltage above the pre-bias
voltage. As long as the output is below about 0.5V, a reduced current limit of typically 1.6A is set internally. If the
device is set to shutdown (EN=GND), undervoltage lockout or thermal shutdown, an internal resistor pulls the
SS/TR pin down to ensure a proper low level. Returning from those states causes a new startup sequence as set
by the SS/TR connection.
A voltage supplied to SS/TR can be used for tracking a master voltage. The output voltage will follow this voltage
in both directions up and down (see Application and Implementation).
9.3.6 Current Limit And Short Circuit Protection
The TPS6213xA-Q1 is protected against heavy load and short circuit events. If a short circuit is detected (VOUT
drops below 0.5V), the current limit is reduced to 1.6A typically. If the output voltage rises above 0.5V, the device
runs in normal operation again. At heavy loads, the current limit determines the maximum output current. If the
current limit is reached, the high-side FET turns off. Avoiding shoot through current, the low-side FET switches
on to allow the inductor current to decrease. The low-side current limit is typically 3.5A. The high-side FET turns
on again, only if the current in the low-side FET has decreased below the low-side current limit threshold.
The output current of the device is limited by the current limit (see Electrical Characteristics). Due to internal
propagation delay, the actual current can exceed the static current limit during that time. The dynamic current
limit can be calculated as follows:
where
ILIMF is the static current limit, specified in the Electrical Characteristics,
L is the inductor value,
VL is the voltage across the inductor (VIN - VOUT) and
tPD is the internal propagation delay.
(4)
The current limit can exceed static values, especially if the input voltage is high and very small inductances are
used. The dynamic high side switch peak current can be calculated as follows:
spacing
(5)
9.3.7 Power Good (PG)
The TPS6213xA-Q1 has a built in power good (PG) function to indicate whether the output voltage has reached
its appropriate level or not. The PG signal can be used for startup sequencing of multiple rails. The PG pin is an
open-drain output that requires a pull-up resistor (to any voltage below 7V). It can sink 2mA of current and
maintain its specified logic low level. TPS6213xA-Q1 features PG=Low when the device is turned off due to EN,
UVLO or thermal shutdown and can be used to actively discharge VOUT (see Figure 37). VIN must remain present
for the PG pin to stay Low. If unused, the PG pin may be left floating.
9.3.8 Pin-Selectable Output Voltage (DEF)
The output voltage of the TPS6213xA-Q1 can be increased by 5% above the nominal voltage by setting the DEF
pin to High (1). When DEF is Low, the device regulates to the nominal output voltage. Increasing the nominal
voltage allows adapting the power supply voltage to the variations of the application hardware. More detailed
information on voltage margining using TPS6213xA-Q1 can be found in SLVA489. A pull down resistor of about
400kOhm is internally connected to the pin, to ensure a proper logic level if the pin is high impedance or floating
after initially set to Low. The resistor is disconnected if the pin is set High.


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