RT6204 Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – Synchronous Step-Down Converter

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 < 3A.
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 < 3A 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
V_IN
Enable
C_IN
C_SS
VIN
BOOT
SW
RT6204
EN
FB
SS _{COMP GND}
C_C
C_P
R_C
L1
R1
C_FF
R2
V_OUT
C_OUT
Efficiency vs. Output Current
100
90
80
70
V_IN = 24V
60
V_IN = 36V
50
V_IN = 48V
40
V_IN = 60V
30
20
10
0
0
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 © 2016 Richtek Technology Corporation. All rights reserved.
DS6204-03 November 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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