RT6264A/B
18V Input, 4A, ACOT
®
Buck Converter with Both FETs OC
Protection
General Description
The
RT6264A/B
is
a
simple,
easy-to-use,
4A
synchronous step-down DC-DC converter with an input
supply voltage range of 4.5V to 18V. The device
possesses an accurate 0.765V reference voltage and
integrates low R
DS(ON)
power MOSFETs to achieve
high efficiency.
The RT6264A/B adopts Advanced Constant On-Time
(ACOT
®
)
control architecture to provide an ultrafast
Features
4A Converter Integrated 66m and 36m FETs
Input Supply Voltage Range : 4.5V to 18V
Maximum Output Voltage Range : 7V
Advanced Constant On-Time (ACOT
®
) Control
Ultrafast Transient Response
Optimized
Capacitors
for
Low-ESR
Ceramic
Output
High Accuracy Feedback Reference Voltage :
Typ.
1%
Optional for Operation Modes :
transient response with few external components and
to operate in nearly constant switching frequency over
the line, load, and output voltage range. The RT6264A
operates in automatic PSM that maintains high
efficiency during light load operation. The RT6264B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
The RT6264A/B senses both FETs current for a robust
over-current
protection.
The
device
features
RT6264A : Power Saving Mode (PSM)
RT6264B : Forced PWM Mode
Fixed Switching Frequency : 650kHz
Enable Control and Internally Fixed Soft-Start
with typ. 1ms
Input Under-Voltage Lockout (UVLO)
Protection Function
cycle-by-cycle current limit protection to prevent the
device from the catastrophic damage in output short
circuit, over-current or inductor saturation conditions. A
built-in soft-start function prevents inrush current during
start-up. The device also includes input under-voltage
lockout,
output
under-voltage
protection,
and
Output Under-Voltage Protection (UVP) with
Hiccup Mode
High- / Low-side MOSFET OCP and OTP
Function
RoHS Compliant and Halogen Free
over-temperature protection (thermal shutdown) to
provide safe and smooth operation in all operating
conditions.
Simplified Application Circuit
RT6264A/B
V
IN
C
IN
SW
Enable
EN
GND
FB
R
T
R
FB2
R
FB1
C
FF
VIN
BOOT
C
BOOT
L
V
OUT
C
OUT
R
BOOT
(Optional)
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6264A/B-01
December 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
