RT7241A Buck Converter Datasheet

RT7241A Datasheet, PDF, Equivalent


Part Number

RT7241A

Description

Synchronous Buck Converter

Manufacture

Richtek

Total Page 21 Pages
Datasheet
Download RT7241A Datasheet


RT7241A
®
RT7241A
12A, 23V, 500kHz, ACOTTM Synchronous Buck Converter
with VTT LDO for Memory Power Supply
General Description
The RT7241A provides a complete power supply for DDR3/
DDR3L/LPDDR3/DDR4 memory systems. It integrates an
Advanced Constant On-Time (ACOTTM) mode synchronous
Buck converter with a 1.5A sink/source tracking linear
regulator.
The PWM converter provides low quiescent supply
current, high efficiency, excellent transient response, and
high DC output accuracy needed for stepping down high-
voltage batteries to generate low-voltage chipset RAM
supplies in notebook computers. The ACOTTM control
scheme handles wide input/output voltage ratios with ease
and provides a very fast response to load transients with
no external compensators.
The 1.5A sink/source VTT LDO maintains fast transient
response only requiring 10μF ceramic output capacitance.
The RT7241A supports all of the sleep state controls
placing VTT at high-Z in S3 and discharging VDDQ and
VTT in S4/S5.
The RT7241A provides complete protection features
including OCP, OVP, UVP, and thermal shutdown. The
RT7241A is available in the UQFN-18L 3x4 package.
Applications
DDR3/DDR3L/LPDDR3/DDR4 Memory Power Supplies
Notebook computers
Marking Information
00= : Product Code
00=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
VIN
VDD
RPGOOD
PGOOD
S3
S5
VIN BOOT
CIN RT7241A
PHASE
VDD
CVDD
FB
PGOOD
PGND
VDDQ
S3
S5
GND
VLDOIN
VTT
VTTSNS
VTTGND
CS
CB
L
R1
R2
VTT
CVTT
RCS
COUT
VDDQ
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS7241A-00 January 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT7241A
RT7241A
Features
DDR3/DDR3L/LPDDR3/DDR4 Complete Solution
PWM Converter (VDDQ)
100μA Low Quiescent Supply Current at S3 Mode
ACOTTM Mode Performs Fast Transient Response
Support MLCC Output Capacitors
Integrated Low On-Resistance MOSFETs
17mΩ of High-Side MOSFET
4.5mΩ of Low-Side MOSFET
Adjustable from 0.6V to 1.5V Output Range for
1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3) and 1.2V
(DDR4)
4.5V to 23V Battery Input Range
500kHz Switching Frequency
Resistor Adjustable Valley Current Limit
Over-/Under-Voltage Protection
Internal Voltage Ramp Soft-Start
Power Good Indicator
1.5A LDO (VTT)
Capable to Sink and Source up to 1.5A
LDO Input Available to Optimize Power Losses
Require Only 10μF Ceramic Output Capacitor
Integrated Divider Tracks 1/2 VDDQ for VTT
Accuracy ±20mV for VTT
Support High-Z in S3 and Soft-Off in S4/S5
Tracking Mode Discharge Control
Thermal Capable Flip-chip (FC) Package for 12A
VDDQ Converter and 1.5A VTT LDO
RoHS Compliant and Halogen Free
Ordering Information
RT7241A
Package Type
QUF : UQFN-18L 3x4 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Pin Configurations
(TOP VIEW)
S3
BOOT
PHASE
18 17 16 15 14
13 PGOOD
1
2 12 VIN
3
11 PGND
PHASE 4
10 PGND
5678 9
UQFN-18L 3x4 (FC)
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7241A-00 January 2016


Features ® RT7241A 12A, 23V, 500kHz, ACOTTM Syn chronous Buck Converter with VTT LDO fo r Memory Power Supply General Descript ion The RT7241A provides a complete pow er supply for DDR3/ DDR3L/LPDDR3/DDR4 m emory systems. It integrates an Advance d Constant On-Time (ACOTTM) mode synchr onous Buck converter with a 1.5A sink/s ource tracking linear regulator. The PW M converter provides low quiescent supp ly current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down highv oltage batteries to generate low-voltag e chipset RAM supplies in notebook comp uters. The ACOTTM control scheme handle s wide input/output voltage ratios with ease and provides a very fast response to load transients with no external co mpensators. The 1.5A sink/source VTT LD O maintains fast transient response onl y requiring 10μF ceramic output capaci tance. The RT7241A supports all of the sleep state controls placing VTT at hig h-Z in S3 and discharging VDDQ and VTT in S4/S5. The RT7241A pro.
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