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IN

OUT

OUT

TRIP

OCL

SW

IN

DS(ON)

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V

V

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V

R

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TPS53014

SLVSBF1 – MAY 2012

www.ti.com

OVER CURRENT PROTECTION

TPS53014 has a cycle-by-cycle over current limit feature. The over current limits the inductor valley current by

inductor current is larger than the over current limit (OCL), the TPS53014 delays the start of the next switching

provide an accuracy and cost effective solution without external devices. To program the OCL, a resister should

be connected between DRVL and PGND. The recommended values are given inTable 1.

Table 1. OCL Resistor Values

Resister Value ( k

Ω)

6.8

0.050

11

0.087

18

0.125

27

0.174

39

0.224

56

0.274

75

0.336

(3)

The trip voltage is set between 0.05V to 0.336V over all operational temperature, including the 4000ppm/°C

over-current limit, the voltage will begin to drop. If the over-current conditions continues the output voltage will fall

below the under voltage protection threshold and the TPS53014 will shut down.

OVER/UNDER VOLTAGE PROTECTION

TPS53014 monitors a resistor divided feedback voltage to detect over and under voltage. If the feedback voltage

is higher than 120% of the reference voltage, the OVP comparator output goes high and the circuit latches the

high-side MOSFET driver OFF and the low-side MOSFET driver ON.

When the feedback voltage is lower than 68% of the reference voltage, the UVP comparator output goes high

and an internal UVP delay counter begins counting. After 1ms, TPS53014 latches OFF both top and bottom

reset when EN goes low.

UVLO PROTECTION

TPS53014 has under voltage lock out protection (UVLO) that monitors the voltage of VREG5 pin. When the

VREG5 voltage is lower than UVLO threshold voltage, the device is shut off. All output drivers are OFF. The

UVLO is non-latch protection.

THERMAL SHUTDOWN

TPS53014 monitors its temperature. If the temperature exceeds the threshold value (typically 150°C), the device

shuts off. When the temperature falls below the threshold, the IC starts again. When VIN starts up and VREG5

output voltage is below its nominal value, the thermal shutdown threshold is kept lower than 150°C. As long as

8

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