RT6204
500mA, 60V, 350kHz Synchronous Step-Down Converter
General Description
The RT6204 is a 60V, 500mA, 350kHz, high-efficiency,
synchronous step-down DC-DC converter with an
input-voltage range of 5.2V to 60V and a programmable
output-voltage range of 0.8V to 50V. 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 < 3A.
The RT6204 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 RT6204 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 60V
Output Current : 500mA
Integrated N-MOSFETs
Current-Mode Control
Fixed Switching Frequency : 350kHz
Programmable Output Voltage : 0.8V to 50V
Low < 3A 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
C
BOOT
100
90
Efficiency vs. Output Current
V
IN
C
IN
VIN
RT6204
BOOT
SW
L1
R1
80
Enable
EN
SS
COMP GND
C
C
C
SS
C
P
R
C
Efficiency (%)
V
OUT
70
60
50
40
30
20
10
0
0
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
V
IN
= 60V
FB
C
FF
R2
C
OUT
V
OUT
= 12V
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Output Current (A)
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6204-04
February 2018
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
