RT6576A/B
Over-Voltage Protection (OVP) & Under-Voltage
Protection (UVP)
LDO5 and LDO3
When the VIN voltage exceeds the POR rising threshold,
LDO3 will default turn-on. The LDO5 can be power on by
ENx. The linear regulator LDO5 and LDO3 provide 5V and
3.3V regulated output.
The two channel output voltages are continuously
monitored for over-voltage and under-voltage conditions.
When the output voltage exceeds over-voltage threshold
(113% of VOUT), UGATE goes low and LGATE is forced
high. When it is less than 52% of reference voltage, under-
voltage protection is triggered and then both UGATE and
LGATE gate drivers are forced low. The controller is latched
until ENx is reset or LDO5 is re-supplied.
Switching Over
The BYP1 is connected to the Channel 1 output. After the
Channel 1 output voltage exceeds the set threshold
(4.66V), the output will be bypassed to the LDO5 output
to maximize the efficiency.
Copyright 2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS6576A/B-02 January 2016
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