RT6203ENGSP datasheet(5/21 Pages) RICHTEK

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RT6203E

DS6203E-00 January 2019

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Input Under-Voltage Lockout

In addition to the EN pin, the RT6203E also provides enable

control through the VIN pin. It features an under-voltage

lockout (UVLO) function that monitors the internal linear

regulator. If VEN rises above VIH first, switching will still be

inhibited until the VIN voltage rises above VUVLO. It is to

ensure that the internal regulator is ready so that operation

with not-fully-enhanced internal MOSFET switches can

be prevented. After the device is powered up, if the input

voltage VIN goes below the UVLO falling threshold voltage

(VUVLO

− ΔVUVLO), this switching will be inhibited; if VIN

rises above the UVLO rising threshold (VUVLO), the device

will resume normal operation with a complete soft-start.

The Over-Current Protection

The RT6203E features cycle-by-cycle current-limit

protection on low-side MOSFETs and prevents the device

from the catastrophic damage in output short circuit and

over current.

The low-side MOSFET over-current protection is achieved

by measuring the inductor current through the

synchronous rectifier (low-side switch) during the low-side

on-time. Once the current rises above the low-side switch

valley current limit (ILIM_L), the on-time one-shot will be

inhibited until the inductor current ramps down to the

current limit level (ILIM_L), that is, another on-time can only

be triggered when the inductor current goes below the

low-side current limit. If the output load current exceeds

the available inductor current (clamped by the low-side

current limit), the output capacitor needs to supply the

extra current such that the output voltage will begin to

drop.

Thermal Shutdown

The RT6203E includes an over-temperature protection

(OTP) circuitry to prevent overheating due to excessive

power dissipation. The OTP will shut down switching

operation when junction temperature exceeds a thermal

shutdown threshold (TSD). Once the junction temperature

cools down by a thermal shutdown hysteresis (20

°C,

typically), the IC will resume normal operation with a

complete soft-start.

Note that the over temperature protection is intended to

protect the device during momentary overload conditions.

The protection is activated outside of the absolute

maximum range of operation as a secondary fail-safe and

therefore should not be relied upon operationally.

Continuous operation above the specified absolute

maximum operating junction temperature may impair

device reliability or permanently damage the device.

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