RT5735A Step-Down Converter Datasheet

RT5735A Datasheet, PDF, Equivalent


Part Number

RT5735A

Description

5A Step-Down Converter

Manufacture

Richtek

Total Page 21 Pages
Datasheet
Download RT5735A Datasheet


RT5735A
RT5735A
5A Step-Down Converter with I2C Interface
General Description
The RT5735A device is a full featured 5.5V, 5A,
synchronous step down constant-on-time (COT)
current mode converter with two integrated MOSFETs.
The RT5735A enables small designs by integrating the
MOSFETs, implementing current mode control to
reduce external component count, reducing inductor
size by enabling up to 2.4MHz switching frequency,
and minimizing the IC footprint with a small
WL-CSP-20B 1.6x2 (BSC) package. The RT5735A
provides accurate regulation for a variety of loads with
an accurate ±1% Voltage Reference (VREF) over
temperature. Efficiency is maximized through the
integrated 34m/18mMOSFETs and 70A typical
quiescent current. Using the enable pin, shutdown
supply current is less than 2A by entering a shutdown
mode.
The output voltage startup ramp is controlled by the
slow start pin. An open-drain power good signal
indicates the output is within 90% to 95% of its nominal
voltage.
Marking Information
4AW
4A : Product Code
W : Date Code
Features
2.5V to 5.5V Input Supply Voltage
Current Mode COT Control Loop Design
Fast Transient Response
Internal 34mand 18mSynchronous Rectifier
Highly Accurate VOUT Regulation Over Load/Line
Range
Robust Loop Stability with Low-ESR COUT
Over-Temperature Protection
Applications
Distributed Power Systems
Enterprise Servers, Ethernet Switches & Routers,
and Global Storage Equipment
Telecom & Industrial Equipment
Ordering Information
RT5735A
Package Type
WSC : WL-CSP-20B 1.6x2 (BSC)
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
VIN ………
C1 C2
RT5735A
PVDD
FB
AVDD
LX
EN
VSEL
SCL PG/PGND
SDA
AGND PGND
L1
VOUT
C3 C4 C5
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS5735A-00 January 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT5735A
RT5735A
Pin Configurations
(TOP VIEW)
A1 A2 A3
VSEL EN SCL
A4
FB
B1
SDA
B2 B3 B4
PGND PG/PGND PGND
C1
AGND
C2
PGND
C3
PGND
C4
PGND
D1
AVDD
D2
PVDD
D3
LX
D4
LX
E1
PVDD
E2
PVDD
E3
LX
E4
LX
WL-CSP-20B 1.6x2 (BSC)
Functional Pin Description
Pin No.
A1
A2
A3
Pin Name
VSEL
EN
SCL
Pin Function
Output Voltage/ Mode Selection. The level determines which of two
programmable, configurations to utilize (operating mode / output voltage).
There is an internal pull down resistor on this pin; could be left open if not used.
Enable Control Input. Active high will enable the part. There is an internal
pull-down resistor on this pin.
I2C Clock Input.
A4 FB
B1 SDA
Output Voltage Pin.
I2C Data Input.
B3 PG/PGND
B2, B4, C2,
C3, C4
C1
D1
D2, E1, E2
PGND
AGND
AVDD
PVDD
D3, D4, E3, E4 LX
Power Good Open-Drain Output. If not used, it has to be connected to ground
plane.
Power Ground.
Analog Ground should be electrically connected to GND close to the device.
Analog Circuit Input Supply Voltage.
Input Supply Voltage, 2.5V to 5.5V.
Switch Node. The source of the internal high-side power MOSFET, and drain of
the internal low-side (synchronous) rectifier MOSFET.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5735A-00 January 2016


Features RT5735A 5A Step-Down Converter with I2C Interface General Description The RT5 735A device is a full featured 5.5V, 5A , synchronous step down constant-on-tim e (COT) current mode converter with two integrated MOSFETs. The RT5735A enable s small designs by integrating the MOSF ETs, implementing current mode control to reduce external component count, red ucing inductor size by enabling up to 2 .4MHz switching frequency, and minimizi ng the IC footprint with a small WL-CSP -20B 1.6x2 (BSC) package. The RT5735A p rovides accurate regulation for a varie ty of loads with an accurate ±1% Volta ge Reference (VREF) over temperature. E fficiency is maximized through the inte grated 34m/18m MOSFETs and 70A typical quiescent current. Using the e nable pin, shutdown supply current is l ess than 2A by entering a shutdown m ode. The output voltage startup ramp is controlled by the slow start pin. An o pen-drain power good signal indicates t he output is within 90% to 95% of its nominal voltage. Marking Informat.
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