RT5701
the protection state. Using I
2
C to shutdown the system
and then re-enable it will also unlatch UVP function. The
event is recorded in register 0x18.SCP. The record can
be reset with I
2
C interface or automatically reset by re-
power-on AVDD.
Over-Current Protection (OCP)
The converter senses the current signal when the high-
side P-MOSFET turns on. As a result, The OCP is cycle-
by-cycle current limitation. If the OCP occurs, the converter
holds off the next on pulse until inductor current drops
below the OCP limit. The event is recorded in register
0x18.OCP. The record can be reset with I
2
C interface or
automatically reset by re-power-on AVDD. The OCP level
can be set with 0x16.IPEAK[1:0].
Over-Temperature Protection (OTP)
The converter has an over-temperature protection. When
the junction temperature is higher than the thermal
shutdown rising threshold, the system will be latched and
the output voltage will no longer be regulated until the
junction temperature drops under the falling threshold.
Output Under-Voltage Protection (UVP)
For short-circuit time < 4ms, the IC will automatically
recovers in 4ms after the short-circuit occurs.
VOUT
For short-circuit time > 5ms, the RT5701 will try to recover
in 4ms after the short-circuit occurs. If it still fails to recover
in 1ms later, it will try to recover in another 4ms cycle.
EN
VOUT
Short-Circuit
Occurs
Auto
Recovery
4ms
1ms
4ms
If short-circuit occurs before enable, and the IC fails to
turn on in 1ms, it will recover in 4ms later.
EN
Short-Circuit
Occurs
Auto Recovery
1ms
4ms
EN
VOUT
Short-Circuit
Occurs
Auto
Recovery
4ms
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS5701-02 March 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
