RT6264A/B
18V Input, 4A, ACOT® Buck Converter with Both FETs OC
Protection
General Description
Features
The RT6264A/B is
a
simple, easy-to-use, 4A
4A Converter Integrated 66m and 36m FETs
Input Supply Voltage Range : 4.5V to 18V
Maximum Output Voltage Range : 7V
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
®
Advanced Constant On-Time (ACOT ) Control
integrates low R
high efficiency.
power MOSFETs to achieve
DS(ON)
Ultrafast Transient Response
Optimized for Low-ESR Ceramic Output
The RT6264A/B adopts Advanced Constant On-Time
Capacitors
®
(ACOT ) control architecture to provide an ultrafast
High Accuracy Feedback Reference Voltage :
Typ. 1%
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.
Optional for Operation Modes :
RT6264A : Power Saving Mode (PSM)
RT6264B : Forced PWM Mode
Fixed Switching Frequency : 650kHz
Enable Control and Internally Fixed Soft-Start
with typ. 1ms
The RT6264A/B senses both FETs current for a robust
Input Under-Voltage Lockout (UVLO)
Protection Function
over-current
protection.
The
device
features
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
over-temperature protection (thermal shutdown) to
provide safe and smooth operation in all operating
conditions.
Output Under-Voltage Protection (UVP) with
Hiccup Mode
High- / Low-side MOSFET OCP and OTP
Function
RoHS Compliant and Halogen Free
Simplified Application Circuit
R
BOOT
RT6264A/B
(Optional)
VIN
V
BOOT
IN
C
BOOT
C
L
IN
SW
V
OUT
C
C
FF
OUT
Enable
EN
R
R
FB1
R
T
FB
GND
FB2
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 ]
