RT8092 Datasheet, PDF (1/27 Pages) Richtek Technology Corporation – High Efficiency Step-Down Converter

®
RT8092
3MHz 4A High Efficiency Step-Down Converter with I²C
Interface
General Description
The RT8092 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 RT8092 is ideally suited for portable electronic devices
that are powered from 1-cell Li-ion battery or from other
power sources within the range such as cellular phones,
PDAs and handy-terminals.
Internal synchronous rectifier with low R_DS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky barrier diode is required in practical application.
The RT8092 enters low-dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. The RT8092 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
WL-CSP-15B 1.2x2 (BSC) and WQFN-14L 3.5x3.5
packages provides small PCB area applications.
To increase battery life time, the RT8092 provides low
power mode with I_Q < 15μA in standby and light-load
applications. The RT8092 also includes Dynamic Voltage
Scaling (DVS) for system low power applications.
The I²C interface let the RT8092 controllable flexibly to
select V_OUT 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
 Low Operation Quiescent Current
 Normal Mode I_Q < 60μA
 Low Power Mode I_Q < 15μA
 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 2.8V (VSEL = High) and 1V
(VSEL = Low)
 4A Continuing Output Current
 Support DVS in the Same Bank
 V_OUT Adjusting Range (max, min) is Settable
 High Efficiency
 90% at 5V ^ 2.8V with 1.5A Load
 3MHz Fixed-Frequency PWM Operation
 Auto-PSM/PWM or Force-PWM Selectable
 Support Remote Ground Sensing for Accurate
Output Voltage
Simplified Application Circuit
Input Power
RT8092
PVIN
LX
Enable
I²C Control
VOUT Select
AVDD
EN
SCL
SDA
VSEL
GNDR
VOUT
PGND
AGND
Load
Output
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS8092-03 January 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1