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  Richtek Technology Electronic Components Datasheet  

RT8035ZQW Datasheet

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 RDS(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
1


  Richtek Technology Electronic Components Datasheet  

RT8035ZQW Datasheet

1.25MHz Synchronous Step-Down Converter

No Preview Available !

RT8035
Typical Application Circuit
VIN1
VIN2
RT8035
8 VIN1
CIN1
4.7µF
3 VIN2
CIN2
4.7µF
Chip Enable
1 EN1
6 EN2
4, 9
11 (Exposed Pad)
GND
L1
LX1 10 2.2µH
FB1 2
L2
LX2 5 2.2µH
FB2 7
CFF1
CFF2
R1
110k
R2
110k
R3
110k
R4
110k
VOUT1
COUT1
10µF
VOUT2
COUT2
10µF
Function Block Diagram
EN1/EN2
VIN1/VIN2
FB1/FB2
Slope
Compensation
Error
Amplifier
RC
COMP
OSC &
Shutdown
Control
Current
Sense
PWM
Comparator
Current
Limit
Detector
Control
Logic
UVLO &
Power Good
Detector
VREF
RS1
Driver
LX1/LX2
RS2
GND
Functional Pin Description
Pin No.
1
2
3
5
6
7
8
10
Pin Name
EN1
FB1
VIN2
LX2
EN2
FB2
VIN1
LX1
Pin Function
Chip Enable of Channel 1 (Active High).
Feedback Input of Channel 1.
Power Supply Input of Channel 2.
Switching Node of Channel 2.
Chip Enable of Channel 2 (Active High).
Feedback Input of Channel 2.
Power Supply Input of Channel 1.
Switching Node of Channel 1.
4, 9, 11
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
(Exposed Pad) GND for maximum power dissipation.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8035-05 October 2012


Part Number RT8035ZQW
Description 1.25MHz Synchronous Step-Down Converter
Maker Richtek
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RT8035ZQW Datasheet PDF






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