RT6272A/B
17V Input, 2A, ACOT
®
Buck Converter with Both FETs OC
Protection
General Description
The RT6272A/B is a simple, easy-to-use, 2A
synchronous step-down DC-DC converter with an input
supply voltage range of 4.5V to 17V. The device
possesses an accurate reference voltage and
integrates low R
DS(ON)
power MOSFETs to achieve
high efficiency.
The RT6272A/B adopts Advanced Constant On-Time
(ACOT
®
) control architecture to provide an ultrafast
transient response with few external components and
to operate in nearly constant switching frequency over
the line, load, and output voltage range. The RT6272A
operates in automatic PSM that maintains high
efficiency during light load operation. The RT6272B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
The RT6272A/B senses both FETs current for a robust
over-current protection (OCP). 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 (OTP) to provide safe and
smooth operation in all operating conditions.
Features
2A Converter Integrated 140m and 84m FETs
Input Supply Voltage Range : 4.5V to 17V
Maximum Output Voltage Range : 7V
Advanced Constant On-Time (ACOT
®
) Control
Ultrafast Transient Response
No Needs for External Compensations
Optimized
for Low-ESR Ceramic Output
Capacitors
High Accuracy Feedback Reference Voltage : Typ.
1%
Optional for Operation Modes :
RT6272A : Power Saving Mode (PSM)
RT6272B : Forced PWM Mode
Fixed Switching Frequency : 1.4MHz
Enable Control and Internally Fixed Soft-Start
with typ. 1ms
Input Under-Voltage Lockout (UVLO)
Protection Function
Output Under-Voltage Protection (UVP) with
Hiccup Mode
High- / Low-side MOSFET OCP and OTP
Function
RoHS Compliant and Halogen Free
Simplified Application Circuit
RT6272A/B
V
IN
VIN
C
IN
SW
Enable
EN
GND
FB
R
FB2
R
FB1
C
FF
BOOT
C
BOOT
L
V
OUT
C
OUT
R
BOOT
(Optional)
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6272A/B-00
January 2020
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
