VCTA25201B-R33MS6 datasheet(10/50 Pages) RICHTEK

10 / 50 page

RTQ2134-QA

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DSQ2134-QA-02

May

2022

during the LSFET on-time. Once the current rises

above the LSFET 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 LSFET current limit. If

the output load current exceeds the available inductor

current (clamped by the LSFET current limit), the

output capacitor needs to supply the extra current so

that the output voltage will begin to drop. If it drops

below the output under-voltage protection trip threshold,

the IC will stop switching to avoid excessive heat.

Output Under-Voltage Protection

The RTQ2134 includes output under-voltage protection

(UVP) against over-load or short-circuited condition by

constantly monitoring the output voltage VOUT. If VOUT

drops below the under-voltage protection trip threshold

(typically 50% of the internal reference voltage), both

HSFET and LSFET will stop switching. Register

0x37[3], 0x38[3] and 0x39[3] can select hiccup or latch

protection behavior of each Buck converter when

converter is in UV condition. For hiccup behavior, both

HSFET and LSFET keep low state in a 1ms and then

IC starts to switch. If the output voltage is not greater

than UV threshold after internal soft-start end signal is

triggered, both HSFET and LSFET will still keep low

state again for next cycle. When each Buck is set to

latch mode, UVP will let converter enter shutdown

mode unless resetting IC by external EN pin or falling

to UVLO low threshold.

Over-Temperature Protection

The RTQ2134 includes an over-temperature protection

(OTP) circuitry to prevent overheating due to excessive

power dissipation. The OTP shuts down switching

operation

when

junction

temperature

exceeds

thermal shutdown threshold TSD. Once the junction

temperature cools down by a thermal shutdown

hysteresis (

TSD), the IC resumes normal operation

with a complete soft-start. It can select not to shut down

IC when OTP happens by using register 0x30[3].

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

permanently damage the device.

VCTA25201B-R33MS6 数据表(PDF) 10 Page - Richtek Technology Corporation

VCTA25201B-R33MS6 数据表(HTML) 10 Page - Richtek Technology Corporation

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