RT6216E
Operation
The RT6216E is a high-efficiency, monolithic synchronous
step-down DC-DC converter that can deliver up to 2.5A
output current from a 4.5V to 24V input supply. Using the
ACOTTM control mode can reduce the output capacitance
and perform fast transient response. It can minimize the
component size without additional external compensation
network.
operation when the junction temperature exceeds the OTP
threshold value. Once the junction temperature cools down
and is lower than the OTP lower threshold, the IC will
resume normal operation.
UVP Protection
The RT6216E detects under-voltage conditions by
monitoring the feedback voltage on FB pin. When the
feedback voltage is lower than 50% of the target voltage,
the UVP comparator will go high to turn off both internal
high-side and low-side MOSFETs.
Current Protection
The inductor current is monitored via the internal switches
cycle-by-cycle. Once the output voltage drops under UV
threshold, the RT6216E will enter hiccup mode.
Hiccup Mode
The RT6216E use hiccup mode for UVP. When the
protection function is triggered, the IC will shut down for a
period of time and then attempt to recover automatically.
Hiccup mode allows the circuit to operate safely with low
input current and power dissipation, and then resume
normal operation as soon as the overload or short circuit
is removed.
Input Under-Voltage Lockout
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage of
VIN is lower than the UVLO falling threshold voltage, the
device will be lockout.
Shut-Down, Start-Up and Enable (EN)
The enable input (EN) has a logic-low level. When VEN is
below this level the IC enters shutdown mode. When VEN
exceeds its logic-high level the IC is fully operational.
External Bootstrap Capacitor
Connect a 0.1μF low ESR ceramic capacitor between
BOOT and SW. This bootstrap capacitor provides the gate
driver supply voltage for the high sideN-channel MOSFET
switch.
Over-Temperature Protection
The RT6216E includes an Over-Temperature Protection
(OTP) circuitry to prevent overheating due to excessive
power dissipation. The OTP will shut down switching
Copyright 2016 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6216E-03 July 2016
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