Step-Down Converter. RT6237A Datasheet


RT6237A Converter. Datasheet pdf. Equivalent


Part Number

RT6237A

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 21 Pages
Datasheet
Download RT6237A Datasheet


RT6237A
®
RT6237A/B
7A, 18V, 500kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT6237A/B is a high-performance 500kHz, 7A step-
down regulator with internal power switches and
synchronous rectifiers. It features quick transient response
using its Advanced Constant On-Time (ACOTTM) control
architecture that provides stable operation with small
ceramic output capacitors and without complicated
external compensation, among other benefits. The input
voltage range is from 4.5V to 18V and the output is
adjustable from 0.7V to 8V. The proprietary ACOTTM control
improves upon other fast response constant on-time
architectures, achieving nearly constant switching
frequency over line, load, and output voltage ranges. Since
there is no internal clock, response to transients is nearly
instantaneous and inductor current can ramp quickly to
maintain output regulation without large bulk output
capacitance. The RT6237A/B is stable with and optimized
for ceramic output capacitors. With internal 40mΩ switches
and 16mΩ synchronous rectifiers, the RT6237A/B displays
excellent efficiency and good behavior across a range of
applications, especially for low output voltages and low
duty cycles. Cycle-by-cycle current limit provides
protection against shorted outputs, input under-voltage
lockout, externally-adjustable soft-start, output under- and
over-voltage protection, and thermal shutdown provide safe
and smooth operation in all operating conditions. The
RT6237A/B is available in the UQFN-14L 2x3 (FC)
package, with exposed thermal pad.
Features
Fast Transient Response
Advanced Constant On-Time (ACOTTM) Control
4.5V to 18V Input Voltage Range
Adjustable Output Voltage from 0.7V to 8V
7A Output Current
40mΩ Internal High-Side N-MOSFET and 16mΩ
Internal Low-Side N-MOSFET
Steady 500kHz Switching Frequency
Up to 95% Efficiency
Optimized for All Ceramic Capacitors
Externally-Adjustable, Pre-Biased Compatible Soft-
Start
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Over- and Under-Voltage Protection
Power Good Output
Thermal Shutdown
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Simplified Application Circuit
VIN
EN Signal
Power Good
RT6237A/B
VIN SW
BOOT
EN FB
PGOOD
PVCC
SS
GND
VOUT
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS6237A/B-00 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6237A
RT6237A/B
Ordering Information
RT6237A/B
Package Type
QUF : UQFN-14L 2x3 (U-Type) (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup Mode UVP
L : Latched OVP & UVP
Note :
A : PSM
B : PWM
Richtek products are :
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.
Marking Information
RT6237ALGQUF
09 : Product Code
09W
W : Date Code
RT6237BLGQUF
07 : Product Code
07W
W : Date Code
RT6237AHGQUF
0A : Product Code
0AW
W : Date Code
Pin Configurations
(TOP VIEW)
RT6237BHGQUF
08 : Product Code
08W
W : Date Code
14 13 12
AGND 1
11 GND
FB 2
10 GND
PVCC 3
9 GND
PGOOD 4
8 VIN
56 7
UQFN-14L 2x3 (FC)
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6237A/B-00 April 2015


Features ® RT6237A/B 7A, 18V, 500kHz, ACOTTM Sy nchronous Step-Down Converter General Description The RT6237A/B is a high-per formance 500kHz, 7A stepdown regulator with internal power switches and synchr onous rectifiers. It features quick tra nsient response using its Advanced Cons tant On-Time (ACOTTM) control architect ure that provides stable operation with small ceramic output capacitors and wi thout complicated external compensation , among other benefits. The input volta ge range is from 4.5V to 18V and the ou tput is adjustable from 0.7V to 8V. The proprietary ACOTTM control improves up on other fast response constant on-time architectures, achieving nearly consta nt switching frequency over line, load, and output voltage ranges. Since there is no internal clock, response to tran sients is nearly instantaneous and indu ctor current can ramp quickly to mainta in output regulation without large bulk output capacitance. The RT6237A/B is s table with and optimized for ceramic output capacitors. With int.
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