RT5701 Step-Down Converter Datasheet

RT5701 Datasheet, PDF, Equivalent


Part Number

RT5701

Description

3MHz 4A High Efficiency Step-Down Converter

Manufacture

Richtek

Total Page 24 Pages
Datasheet
Download RT5701 Datasheet


RT5701
®
RT5701
3MHz 4A High Efficiency Step-Down Converter with I2C
Interface
General Description
The RT5701 is a Peak-Current Mode Pulse-Width-
Modulated (PWM) step-down DC/DC converter with I2C
control interface. Capable of delivering 4A continuing output
current over a wide input voltage range from 2.5V to 5.5V,
the RT5701 is ideally suited for Automotive Infotainment
applications for low-voltage outputs to Micro controllers
and ASICs in Navigation, Information Display, and Audio
systems, Video systems and other battery operated
systems requiring very low Shutdown current and
Quiescent current consumption.
Internal synchronous rectifier with low RDS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky barrier diode is required in practical application.
The RT5701 enters low-dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. The RT5701 enters shut-
down mode and consumes less than 5μA when the EN
pin is pulled low. The switching ripple is easily smoothed-
out by small package filtering elements due to a fixed
operation frequency of 3MHz. This along with small
TSSOP-14 (Exposed Pad) package provides small PCB
area applications.
The RT5701 also includes Dynamic Voltage Scaling (DVS)
for system low power applications.
The I2C interface let the RT5701 controllable flexibly to
select VOUT voltage level, peak current limit level, PWM
control mode, and so on. Other features include soft-start,
auto discharge, lower internal reference voltage, over-
temperature, and over-current protection.
Features
2.5V to 5.5V Input Range
Output Range from 0.3V to 5.5V
Bank 0 : 0.3V to 0.7V
Bank 1 : 0.6V to 1.4V
Bank 2 : 1.2V to 2.8V
Bank 3 : 2.4V to 5.5V
The Default Value is 1.5V (VSEL = High) and 1V
(VSEL = Low)
4A Continuing Output Current
Support DVS in the Same Bank
VOUT Adjusting Range (max, min) is Settable
High Efficiency
84% at 5V 1.5V with 1.5A Load
3MHz Fixed-Frequency PWM Operation
Auto-PSM/PWM or Force-PWM Selectable
Support Remote Ground Sensing for Accurate
Output Voltage
Dedicated Hardware Pin to Immediately Switch
Nominal Output Voltage Setting
Output Discharging when Turning Off
Over-Current Protection
OC Level Settable
Simplified Application Circuit
Input Power
RT5701
PVIN
LX
Enable
I2C Control
VOUT Select
AVDD
EN
SCL
SDA
VSEL
GNDR
VOUT
GND
Load
Output
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS5701-00 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT5701
RT5701
Over-Temperature Protection
Integrated Soft-Start Function
Enabling Control by Enable Pin and I2C Register
Setting by Software
I2C Interface
I2C Communication allowed Even in Off-State
(EN = L)
Support Fast Mode (400kbps)
Registers Setting Retained in Off-State (EN = L)
RoHS Compliant and Halogen Free
Applications
Automotive Infotainment Systems
Microprocessor and DSP Core Supply
Industrial-Grade Point-of-Load
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Marking Information
RT5701
GCPYMDNN
RT5701GCP : Product Number
YMDNN : Date Code
Ordering Information
RT5701
Package Type
CP : TSSOP-14 (Exposed Pad)
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)
VSEL
EN
SCL
GNDR
VOUT
NC
AVDD
14
2 13
3 12
4 GND 11
5 10
6 15 9
78
SDA
GND
LX
LX
NC
PVIN
PVIN
TSSOP-14 (Exposed Pad)
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5701-00 December 2014


Features ® RT5701 3MHz 4A High Efficiency Step- Down Converter with I2C Interface Gene ral Description The RT5701 is a Peak-Cu rrent Mode Pulse-WidthModulated (PWM) s tep-down DC/DC converter with I2C contr ol interface. Capable of delivering 4A continuing output current over a wide i nput voltage range from 2.5V to 5.5V, t he RT5701 is ideally suited for Automot ive Infotainment applications for low-v oltage outputs to Micro controllers and ASICs in Navigation, Information Displ ay, and Audio systems, Video systems an d other battery operated systems requir ing very low Shutdown current and Quies cent current consumption. Internal sync hronous rectifier with low RDS(ON) dram atically reduces conduction loss at PWM mode. No external Schottky barrier dio de is required in practical application . The RT5701 enters low-dropout mode wh en normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. The RT5701 enter s shutdown mode and consumes less than 5μA when the EN pin is pu.
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