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  Richtek Technology Electronic Components Datasheet  

RT8010B Datasheet

High Efficiency PWM Step-Down DC/DC Converter

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RT8010B pdf
Preliminary
RT8010B
1.5MHz, 800mA, High Efficiency PWM
Step-Down DC/DC Converter
General Description
Features
The RT8010B is a high-efficiency Pulse-Width-Modulated
(PWM) step-down DC-DC converter. Capable of delivering
800mA output current over a wide input voltage range from
2.5V to 4V, the RT8010B is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
www.DataShbeaettt4eUr.ycoomr from other power sources such as cellular
phones, PDAs and hand-held devices.
Two operating modes are available including PWM/Low-
Dropout autoswitch and shut-down modes. 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 RT8010B enters Low-Dropout mode when normal
PWM can not provide regulated output voltage by
continuously turning on the upper PMOS. The RT8010B
enters shut-down mode and consumes less than 0.1μA
when EN pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operating
frequency of 1.5MHz. This along with small WDFN-8L 2x2
package provides small PCB area application. Other
features include soft start, lower internal reference voltage
with 2% accuracy, over temperature protection, and over
current protection.
+2.5V to +4V Input Range
Output Voltage (Adjustable Output From 0.6V to VIN)
800mA Output Current
95% Efficiency
No Schottky Diode Required
1.5MHz Fixed-Frequency PWM Operation
Small 8-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Pin Configurations
(TOP VIEW)
EN 1
FB 2
VIN 3
LX 4
8 PGND
7 PGND
6 PGND
9 5 AGND
WDFN-8L 2x2
Marking Information
Ordering Information
RT8010B
Package Type
QW : WDFN-8L 2x2 (W-Type)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Note :
Richtek Green 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.
`100% matte tin (Sn) plating.
DS8010B-00 July 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8010B Datasheet

High Efficiency PWM Step-Down DC/DC Converter

No Preview Available !

RT8010B pdf
RT8010B
Typical Application Circuit
Preliminary
VIN
2.5V to 4V
VOUT
=
VREF
x ⎜⎝⎛1+
R1
R2
⎟⎠⎞
L
3 VIN
2.2uH
LX 4
VOUT
CIN
4.7uF
RT8010B
C1 R1
1 EN
FB 2
COUT
IR2 R2 10uF
6, 7, 8 PGND AGND 5
www.DataShweiteht4RU2.co=m75kΩ to 200kΩ,
and (R1 x C1) should be in the range between 3x10-6 and 6x10-6 for component selection.
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 EN
Chip Enable (Active High).
2 FB
Feedback Pin.
3 VIN
Power Input.
4 LX
Pin for Switching.
5 AGND
6, 7, 8
PGND
Exposed Pad (9) NC
Analog Ground.
Power Ground.
No Internal Connection.
Function Block Diagram
EN
Slope
Compensation
OSC &
Shutdown
Control
Current
Sense
PWM
FB
Error
Comparator
Amplifier
RC
Current
Limit
Detector
Control
Logic
COMP
UVLO &
Power Good
Detector
VREF
Driver
VIN
RS1
LX
RS2
PGND
AGND
www.richtek.com
2
DS8010B-00 July 2007


Part Number RT8010B
Description High Efficiency PWM Step-Down DC/DC Converter
Maker Richtek
Total Page 12 Pages
PDF Download
RT8010B pdf
RT8010B Datasheet PDF
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