®
RT6210
500mA, 80V, 350kHz Synchronous Step-Down Converter
General Description
The RT6210 is a 80V, 500mA, 350kHz, high-efficiency,
synchronous step-down DC-DC converter with an input-
voltage range of 5.2V to 80V and a programmable output-
voltage range of 0.8V to 72V. It features current-mode
control to simplify external compensation and to optimize
transient response with a wide range of inductors and output
capacitors. High efficiency can be achieved through
integrated N-MOSFETs, and pulse-skipping mode at light
loads. With EN pin, power-up sequence can be more
flexible and shutdown quiescent current can be reduced
to < 3μA.
The RT6210 features cycle-by-cycle current limit for over-
current protection against short-circuit outputs, and user-
programmable soft-start time to prevent inrush current
during startup. It also includes input under-voltage lockout,
output under-voltage, and thermal shutdown protection to
provide safe and smooth operation in all operating
conditions.
The RT6210 is available in the SOP-8 (Exposed pad)
package.
Features
0.8V Feedback Reference Voltage with ±1.5%
Accuracy
Wide Input Voltage Range : 5.2V to 80V
Output Current : 500mA
Integrated N-MOSFETs
Current-Mode Control
Fixed Switching Frequency : 350kHz
Programmable Output Voltage : 0.8V to 72V
Low < 3μA Shutdown Quiescent Current
Up to 92% Efficiency
Pulse-Skipping Mode for Light-Load Efficiency
Programmable Soft-Start Time
Cycle-by-Cycle Current Limit Protection
Input Under-Voltage Lockout, Output Under-Voltage
and Thermal Shutdown Protection
Applications
4-20mA Loop-Powered Sensors
OBD-II Port Power Supplies
Low-Power Standby or Bias Voltage Supplies
Industrial Process Control, Metering, and Security
Systems
High-Voltage LDO Replacement
Telecommunications Systems
Commercial Vehicle Power Supplies
General Purpose Wide Input Voltage Regulation
Simplified Application Circuit
VIN
Enable
CBOOT
CIN
CSS
VIN BOOT
SW
RT6210
EN FB
SS COMP GND
CC
CP RC
L1
R1
CFF
R2
VOUT
COUT
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS6210-00 May 2017
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs. Output Current
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 80V
VOUT = 12V
0.1 0.2 0.3 0.4
Output Current (A)
0.5
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
