RT8035 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Dual 800mA, 1.25MHz Synchronous Step-Down Converter

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RT8035
Dual 800mA, 1.25MHz Synchronous Step-Down Converter
General Description
The RT8035 is a high-efficiency Pulse-Width-Modulated
(PWM) dual step-down DC/DC converter. Capable of
delivering up to 800mA output current over a wide input
voltage range from 2.5V to 5.5V, the RT8035 is ideally
suited for portable electronic devices that are powered
from 1-cell Li-ion battery or from other power sources such
as cellular phones, PDAs, PC WLAN card and hand-held
devices.
Three operating modes are available including : PWM
mode, Low-Dropout Mode and shut-down mode. The
Internal synchronous rectifier with low R_DS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky diode is required in practical application. The
RT8035 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. The RT8035 enters shut-
down mode and consumes less than 0.1μA when the EN
pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to the fixed operating
frequency of 1.25MHz. The RT8035 is available in the
WDFN-10L 3x3 package.
Ordering Information
RT8035
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
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.
Features
z 2.5V to 5.5V Input Range
z 800mA Output Current
z 1.25MHz Fixed Frequency PWM Operation
z 95% Efficiency
z No Schottky Diode Required
z 0.6V Reference Allows Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
z Small 10-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Portable Instruments
z Microprocessors and DSP Core Supplies
z Cellular Phones
z Wireless and DSL Modems
z PC Cards
Pin Configurations
(TOP VIEW)
EN1 1
FB1 2
VIN2 3
GND 4
LX2 5
10 LX1
9 GND
8 _VIN1
7 FB2
11
EN2
WDFN-10L 3x3
Marking Information
RT8035GQW
GD= : Product Code
GD=YM ^{YMDNN : Date Code}
DNN
RT8035ZQW
GD YM
DNN
GD : Product Code
YMDNN : Date Code
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8035-05 October 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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