®
RT5715
5.5V
IN
, 2A, High Efficiency Synchronous Step-Down Converter
with Low Quiescent Current
General Description
The RT5715 is a 2A, high-efficiency, Advanced Constant-
On-Time (ACOT) synchronous step-down converter. The
device operates with input voltages from 2.5V to 5.5V.
The device can program the output voltage between 0.45V
to VIN. The low quiescent current design with the
integrated low R
DS(ON)
power MOSFETs achieves high
efficiency over the wide load range. The advanced COT
operation allows transient responses to be optimized over
a wide range of loads, and output capacitors to efficiently
reduce external component count. The RT5715 provides
up to 2.7MHz switching frequency to minimize the size
of output inductor and capacitors.
The RT5715 provides complete protection functions such
as input under voltage lockout, output under voltage
protection, over current protection, and thermal shutdown.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. The RT5715 is available in WDFN-
8SL 2x2 package.
Features
2A Converter Integrated 100mΩ and 80mΩ FETs in
Ω
Ω
WDFN-8SL 2x2 Package
Input Supply Voltage Range : 2.5V to 5.5V
Output Voltage Range : 0.45V to V
IN
Advanced Constant On-Time (ACOT
TM
) Control
Ultrafast Transient Response
�½
�½
No Needs for External Compensations
Optimized for Low-ESR Ceramic Output Capacitors
�½
High Accuracy Feedback Reference Voltage : 0.45V
±
1%
μ
Low Quiescent Current : 30μA
Fixed Switching Frequency : 2.7MHz
Internally Fixed Soft-Start (typ. 150μs)
μ
Safe Start-Up from Pre-biased Output
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with Hiccup
Mode
Over-Temperature Protection (OTP) (Thermal
Shutdown)
Enable Control
Power Good Indication
RoHS Compliant and Halogen Free
Applications
Mobile Phones and Handheld Devices
STB, Cable Modem, and xDSL Platforms
WLAN ASIC Power / Storage (SSD and HDD)
General Purpose for POL LV Buck Converter
Simplified Application Circuit
RT5715
V
IN
VIN
EN
LX
PGND
AGND
VOS
FB
R
FB1
V
OUT
PGOOD
Power Good
R
FB2
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5715-02
November 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
