Step-Down Converter. RT6201B Datasheet


RT6201B Converter. Datasheet pdf. Equivalent


Part Number

RT6201B

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT6201B Datasheet


RT6201B
®
RT6201A/B
4A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT6201A/B is a synchronous step-down DC/DC
converter with Advanced Constant On-Time (ACOTTM)
mode control. It achieves high power density to deliver up
to 4A output current from a 4.5V to 18V input supply. The
proprietary ACOTTM mode offers an optimal transient
response over a wide range of loads and all kinds of ceramic
capacitors, which allows the device to adopt very low ESR
output capacitor for ensuring performance stabilization. In
addition, RT6201A/B keeps an excellent constant
switching frequency under line and load variation and the
integrated synchronous power switches with the ACOTTM
mode operation provides high efficiency in whole output
current load range. Cycle-by-cycle current limit provides
an accurate protection by a valley detection of low side
MOSFET and external soft-start setting eliminates input
current surge during startup. Protection functions include
thermal shutdown for RT6201A/B.
The RT6201A/B are available in the SOP-8 (Exposed Pad)
package.
Pin Configurations
(TOP VIEW)
EN
FB
VREG5
SS
8
27
GND
36
9
45
VIN
BOOT
SW
GND
SOP-8 (Exposed Pad)
Features
ACOTTM Mode Enables Fast Transient Response
4.5V to 18V Input Voltage Range
4A Output Current
50mΩ Internal Low Side N-MOSFET
Advanced Constant On-Time Control
Support All Ceramic Capacitors
Up to 95% Efficiency
650kHz Switching Frequency at all Load Current
(RT6201B)
Discontinuous Operating Mode at Light Load
(RT6201A)
Adjustable Output Voltage from 0.765V to 8V
Adjustable Soft-Start
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Thermal Shutdown
RoHS Compliant and Halogen Free
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
Enable
RT6201A/B
VIN SW
EN
VREG5
SS
BOOT
FB
GND
VOUT
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS6201A/B-00 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6201B
RT6201A/B
Ordering Information
RT6201A/B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Trim Operation
H : Hiccup
PSM/PWM Mode
A : PSM Mode
B : PWM Mode
Note :
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
RT6201AHGSP
RT6201AH
GSPYMDNN
RT6201AHGSP : Product Number
YMDNN : Date Code
RT6201BHGSP
RT6201BH
GSPYMDNN
RT6201BHGSP : Product Number
YMDNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 EN
Enable Control Input. A logic-high enables the converter; a logic-low forces the
IC into shutdown mode reducing the supply current to less than 10A.
2 FB
Feedback Voltage Input. It is used to regulate the output of the converter to a set
value via an external resistive voltage divider. The feedback threshold voltage is
0.765V typically.
3
VREG5
Internal Regulator Output. Connect a 1F capacitor to GND to stabilize output
voltage.
4 SS
Soft-Start Time Setting. Connect an external capacitor between this pin and GND to
set the soft- start time.
5, 9
(Exposed Pad)
GND
Power Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
6 SW
Switch Node. Connect this pin to an external L-C filter.
7 BOOT
Bootstrap Supply for High Side Gate Driver. Connect a 0.1F capacitor between
the BOOT and SW pin.
8 VIN
Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a
suitably large (10F x 2) ceramic capacitor.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6201A/B-00 December 2013


Features ® RT6201A/B 4A, 18V, 650kHz, ACOTTM Sy nchronous Step-Down Converter General Description The RT6201A/B is a synchron ous step-down DC/DC converter with Adva nced Constant On-Time (ACOTTM) mode con trol. It achieves high power density to deliver up to 4A output current from a 4.5V to 18V input supply. The propriet ary ACOTTM mode offers an optimal trans ient response over a wide range of load s and all kinds of ceramic capacitors, which allows the device to adopt very l ow ESR output capacitor for ensuring pe rformance stabilization. In addition, R T6201A/B keeps an excellent constant sw itching frequency under line and load v ariation and the integrated synchronous power switches with the ACOTTM mode op eration provides high efficiency in who le output current load range. Cycle-by- cycle current limit provides an accurat e protection by a valley detection of l ow side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown fo.
Keywords RT6201B, datasheet, pdf, Richtek, Synchronous, Step-Down, Converter, T6201B, 6201B, 201B, RT6201, RT620, RT62, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)