RT7290A Buck Converter Datasheet

RT7290A Datasheet, PDF, Equivalent


Part Number

RT7290A

Description

Synchronous Buck Converter

Manufacture

Richtek

Total Page 18 Pages
Datasheet
Download RT7290A Datasheet


RT7290A
®
RT7290A
6A, 23V, 500kHz, ACOTTM Synchronous Buck Converter
with LDO for System 3.3V
General Description
The RT7290A is a synchronous Buck converter with
Advanced Constant On-Time (ACOTTM) mode control. The
main control loop of RT7290A uses an ACOTTM mode
control which provides a very fast transient response with
no external compensators. The RT7290A operates from
5V to 23V input voltage, provides a 3.3V LDO and a 300kHz
CLK to drive an external charge pump. OCP, UVP and
OVP are included in the RT7290A. This IC also provides
a 1.5ms internal soft-start function and an open-drain power
good indicator.
Applications
Laptop Computers
Tablet PCs
Networking Systems
Servers
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
Features
5V to 23V Input Voltage Range
PWM Frequency Fixed 500kHz
ACOTTM Mode Performs Fast Transient Response
Integrated MOSFETs
31mΩ of High-Side MOSFET
20mΩ of Low-Side MOSFET
Support Output MLCC Stable
Internal Soft-Start (1.5ms typ)
Built-in OVP/UVP/OCP
Power Good Indicator
Fixed 300kHz VCLK to Support Charge Pump
Individual EN for PWM and LDO
Thermal Shutdown
Marking Information
3B=YM
DNN
3B= : Product Code
YMDNN : Date Code
Simplified Application Circuit
VSYS
D1
C1
D2
C2
D3
C3
D4
C4
VCP
C5
VIN
CIN
VLDO
VSYS
CLDO
VIN CLK BOOT
RT7290A
EN SW
RB
CB L
LDO
VOUT
PGND
VBYP
PGOOD
ENLDO
VCC
AGND
RPGOOD
CVCC
VOUT
COUT
VCC
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS7290A-01 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT7290A
RT7290A
Ordering Information
RT7290A
Package Type
QUF : UQFN-16L 3x3 (FC) (U-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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)
14 13 12 11 10
VIN 1
15 9 SW
PGND 2
SW
16
SW
8 SW
34567
UQFN-16L 3x3 (FC)
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8, 9, 15, 16
10
11
12
13
14
Pin Name
VIN
PGND
VBYP
PGOOD
CLK
LDO
VOUT
SW
BOOT
VCC
ENLDO
EN
AGND
Pin Function
Power Input Connect to High-Side MOSFET Drain.
Power Ground.
Switch Over Source Voltage for VCC. Do not connect to VCC pin.
Open-Drain Power Good Indicator Output.
300kHz Clock Output to Drive the External Charge Pump.
3.3V Linear Regulator Output. Decouple with a minimum 4.7F ceramic
capacitor.
Output Voltage Sense Input. An internal discharging circuit is connected to this
pin.
Switch Node.
Bootstrap Supply for High-Side Gate Driver. A capacitor is needed to drive the
power switch's gate above the supply voltage. It is connected between the SW
and BOOT pins to form a floating supply across the power switch driver.
5V Linear Regulator Output for Internal Control Circuit. A capacitor (typical
1F) should be connected to AGND. VCC can only supply internal circuits. Do
not connect to external loads.
Enable Control Input for Linear Regulator. This pin is internally pulled up to
high by 10A.
Enable Control Input. Do not leave this pin floating.
Analog Ground.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7290A-01 January 2015


Features ® RT7290A 6A, 23V, 500kHz, ACOTTM Sync hronous Buck Converter with LDO for Sys tem 3.3V General Description The RT729 0A is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mod e control. The main control loop of RT7 290A uses an ACOTTM mode control which provides a very fast transient response with no external compensators. The RT7 290A operates from 5V to 23V input volt age, provides a 3.3V LDO and a 300kHz C LK to drive an external charge pump. OC P, UVP and OVP are included in the RT72 90A. This IC also provides a 1.5ms inte rnal soft-start function and an open-dr ain power good indicator. Applications  Laptop Computers  Tablet PCs  Networking Systems  Servers  Per sonal Video Recorders  Flat Panel Te levision and Monitors  Distributed P ower Systems Features  5V to 23V In put Voltage Range  PWM Frequency Fix ed 500kHz  ACOTTM Mode Performs Fast Transient Response  Integrated MOSF ETs  31mΩ of High-Side MOSFET  20mΩ of Low-Side MOSFET  Support Output MLCC Stable .
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