®
RT5707/A
Ultra-Low Quiescent Current HCOT Buck Converter
General Description
The RT5707/A is a high efficiency synchronous step-down
converter featuring
typ. 360nA quiescent current. It provides
high efficiency at light load down to 10mA. Its input voltage
range is from 2.2V to 5.5V. The RT5707 provides eight
programmable output voltage 1.2V to 3.3V while delivering
output current up to 600mA, peak to 1A. The RT5707A
provides eight programmable output voltage 0.7V to 3.1V
while delivering output current up to 400mA, peak to 0.5A.
The Hysteretic Constant-On-Time (HCOT) operation with
internal compensation allow the transient response to be
optimized over a wide range of loads and output capacitors.
The RT5707/A is a available in WL-CSP-8B 0.9x1.6 (BSC)
package.
Features
Input Voltage Range : 2.2V to 5.5V
Programmable Output Voltage 8-Level
�½
RT5707 1.2V to 3.3V
�½
RT5707A 0.7V to 3.1V
Typ. 360nA Quiescent Current
PSM Operation
Up to 94% Efficiency
Internal Compensation
Output Voltage Discharge
Over-Current Protection
Over-Temperature Protection
Output Current
�½
RT5707 600mA, Peak to 1A
�½
RT5707A 400mA, Peak to 0.5A
Automatic Transition to 100% Duty Cycle Operation
Ordering Information
RT5707/A
Package Type
WSC : WL-CSP-8B 0.9x1.6 (BSC)
Note :
Richtek products are :
�½
Applications
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Hand-Held
Devices
Portable Information
Battery Powered Equipment
Wearable Devices
Internet of Things
Smart Watch
�½
Simplified Application Circuit
RT5707/A
V
IN
C
IN
VIN
SW
VOUT
EN
VSEL1
VSEL2
VESL3
GND
V
IN
or GND
V
IN
or GND
V
IN
or GND
L1
V
OUT
C
OUT
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5707/A-03 February 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
