Step-Down Converter. RT6242B Datasheet


RT6242B Converter. Datasheet pdf. Equivalent


Part Number

RT6242B

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 20 Pages
Datasheet
Download RT6242B Datasheet


RT6242B
®
RT6242A/B
12A, 18V, 500kHz, ACOTTM Synchronous Step-Down Converter
General Description
Features
The RT6242A/B is a synchronous step-down converter
with Advanced Constant On-Time (ACOTTM) mode control.
The ACOTTM provides a very fast transient response with
few external components. The low impedance internal
MOSFET supports high efficiency operation with wide
input voltage range from 4.5V to 18V. The proprietary circuit
of the RT6242A/B enables to support all ceramic
capacitors. The output voltage can be adjustable between
0.7V and 8V. The soft-start is adjustable by an external
capacitor.
Ordering Information
RT6242A/B
Package Type
QUF : UQFN-16JL 3x3 (U-Type) (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup Mode UVP
L : Latched OVP & UVP
A : PSM
B : PWM
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.
4.5V to 18V Input Voltage Range
12A Output Current
12mΩ Internal High-Side N-MOSFET and 5.4mΩ
Internal Low-Side N-MOSFET
Advanced Constant On-Time Control
Fast Transient Response
Support All Ceramic Capacitors
Up to 95% Efficiency
Adjustable Switching Frequency from 300kHz to
700kHz
Adjustable Output Voltage from 0.7V to 8V
Adjustable Soft-Start
Pre-bias Start-Up
Adjustable Current Limit from 6A to 16A
Cycle-by-Cycle Over Current Protection
Power Good Output
Input Under-Voltage Lockout
Hiccup Mode Under-Voltage Protection
Thermal Shutdown Protection
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
RT6242A/B
VIN SW
BOOT
EN
FB
PGOOD
RT
PVCC
RLIM
SS GND
VOUT
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS6242A/B-05 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6242B
RT6242A/B
Pin Configurations
(TOP VIEW)
16 15 14 13
AGND 1
12 SW
FB 2
11 SW
PVCC 3
10 SW
RT 4
9 BOOT
56
78
UQFN-16JL 3x3 (FC)
Marking Information
RT6242AHGQUF
7D= : Product Code
7D=YM
DNN
YMDNN : Date Code
RT6242ALGQUF
7C= : Product Code
7C=YM
DNN
YMDNN : Date Code
RT6242BHGQUF
78= : Product Code
78=YM
DNN
YMDNN : Date Code
RT6242BLGQUF
75= : Product Code
75=YM
DNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1
2
Pin Name
AGND
FB
Pin Function
Analog Ground.
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 reference voltage is
0.7V typically.
3 PVCC
4 RT
5 SS
Internal Regulator Output. Connect a 1F capacitor to GND to stabilize output
voltage.
An External Timing Resistor Adjusts the Switching Frequency of the Device.
Soft-Start Time Setting. An external capacitor should be connected between this
pin and GND.
6 VIN
Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a
suitably large (10F x 2) ceramic capacitor.
7 GND
Ground.
8
PGOOD
Power Good Indicator Open-Drain Output.
9 BOOT
10 to 14
15
16
SW
EN
RLIM
Bootstrap. This capacitor is needed to drive the power switch's gate above the
supply voltage. It is connected between SW and BOOT pins to form a floating
supply across the power switch driver. A 0.1F capacitor is recommended for use.
Switch Node. Connect this pin to an external L-C filter.
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.
An External Resistor Adjusts the Current Limit of the Device.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6242A/B-05 April 2016


Features ® RT6242A/B 12A, 18V, 500kHz, ACOTTM S ynchronous Step-Down Converter General Description Features The RT6242A/B i s a synchronous step-down converter wit h Advanced Constant On-Time (ACOTTM) mo de control. The ACOTTM provides a very fast transient response with few extern al components. The low impedance intern al MOSFET supports high efficiency oper ation with wide input voltage range fro m 4.5V to 18V. The proprietary circuit of the RT6242A/B enables to support all ceramic capacitors. The output voltage can be adjustable between 0.7V and 8V. The soft-start is adjustable by an ext ernal capacitor. Ordering Information R T6242A/B Package Type QUF : UQFN-16JL 3 x3 (U-Type) (FC) Lead Plating System G : Green (Halogen Free and Pb Free) UVP Option H : Hiccup Mode UVP L : Latched OVP & UVP A : PSM B : PWM Note : Richte k products are :  RoHS compliant and compatible with the current requiremen ts of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes.  4.5V to 18V Inpu.
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