RT6252A/B
17V Input, 2A, ACOT
TM
Buck Converter with Both FETs OC
Protection
General Description
The RT6252A/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 RT6252A/B adopts Advanced Constant On-Time
(ACOT
TM
) 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 RT6252A
operates in automatic PSM that maintains high
efficiency during light load operation. The RT6252B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
The RT6252A/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
TM
) Control
Ultrafast Transient Response
Optimized
for Low-ESR Ceramic Output
Capacitors
High Accuracy Feedback Reference Voltage : Typ.
1%
Optional for Operation Modes :
Automatically
(RT6252A)
Power
Saving
Mode
(PSM)
Forced PWM Mode (RT6252B)
Fixed Switching Frequency : 580kHz
Enable Control and Internally Fixed Soft-Start
Safe Start-Up from Pre-biased Output
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with
Hiccup Mode
High- /Low-side MOSFET OCP and OTP Function
RoHS Compliant and Halogen Free
Simplified Application Circuit
RT6252A/B
V
IN
C
IN
SW
Enable
EN
GND
1
FB
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.
DS6252A/B-00
July 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
