RT5710B
6V, 1A, 1.5MHz, CMCOT Synchronous Step-Down Converter
General Description
The RT5710B is a simple, easy-to-use, 1A synchronous
step-down DC-DC converter with an input supply
voltage range of 2.5V to 6V. The device build-in an
accurate 0.6V reference voltage and integrates low
R
DS(ON)
power MOSFETs to achieve high efficiency in
a WDFN-6L 2x2 package.
The RT5710B adopts Current Mode Constant On-Time
(CMCOT) 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 RT5710B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
The RT5710B senses Low-Side FETs current for a
robust over-current protection. It features cycle-by-cycle
current limit protection and prevent the device from the
catastrophic damage in output short circuit, over current
or inductor saturation. An Internally 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. The
RT5710B is offered in a WDFN-6L 2x2 package.
Features
1A Converter With Built-In 160m/110m Low
R
DS(ON)
Power FETs
Input Supply Voltage Range : 2.5V to 6V
Output Voltage Range : 0.6V to 3.4V
Current
Control
Mode
Constant On-Time
(CMCOT)
Ultrafast Transient Response
No Needs For External Compensations
Optimized for Low-ESR Ceramic Output
Capacitors
0.6
2%
High-Accuracy Feedback Reference
Voltage
LS FETs Protection for Robust Over-Current
Protection
Forced PWM Mode
Fixed Switching Frequency : 1.5MHz
Internally Soft-Start Function
Monotonic Start-Up for Pre-Biased Output
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with
Hiccup Mode
Enable Control
Available In WDFN-6L 2x2 Package
Applications
STB, Cable Modem, & xDSL Platforms
LCD TV Power Supply & Metering Platforms
General Purpose Point of Load (POL)
Simplified Application Circuit
L
V
IN
C
IN
VIN
LX
R1
C
OUT
R2
V
OUT
RT5710B
EN
FB
GND
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5710B-05
November 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
