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YOBON TECHNOLOGIES
YOBON TECHNOLOGIES


YB1680

600mA Synchronous Step-Down Converter



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YB1680 pdf
YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
Description
The YB1680 is a 1.5MHz constant
frequency, slope compensated current
mode PWM step-down converter. The
device integrates a main switch and a
synchronous rectifier for high efficiency
without an external Schottky diode. It is
ideal for powering portable equipment that
runs from a single cell lithium-Ion (Li+)
battery. The YB1680 can supply 600mA of
load current from a 2.5V to 5.5V input
voltage. The output voltage can be
regulated as low as 0.6V. The YB1680 can
also run at 100% duty cycle for low dropout
operation, extending battery life in portable
system. Idle mode operation at light loads
provides very low output ripple voltage for
noise sensitive applications.
The YB1680 is offered in a low profile 5-pin,
SOT package, and is available in an
adjustable version.
Features
„ High Efficiency : Up to 94%
„ 1.5MHz Constant Switching Frequency
„ 600mA Output Current at VIN=3V
„ Integrated Main Switch and Synchronous
Rectifier. No Schottky Diode Required
„ 2.5V to 5.5V Input Voltage Range
„ Output Voltage as Low as 0.6V
„ 100% Duty Cycle in Dropout
„ Low Quiescent Current : 300μA
„ Slope Compensated Current Mode
Control for Excellent Line and Load
Transient Response
„ Short Circuit Protection
„ Thermal Fault Protection
„ <1μA Shutdown Current
„ Space Saving 5-Pin SOT23 Package
„ Pb-free Package
Applications
„ Cellular and Smart Phones
„ Microprocessors and DSP Core Supplies
„ Wireless and DSL Modems
„ PDAs
„ MP3 Player
„ Digital Still and Video Cameras
„ Portable Instruments
Typical Application Circuit
Figure 1: Typical Application Circuit
YB1680 Rev.1.0
www.yobon.com.tw
1



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YB1680 pdf
Pin Configuration
YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
EN 1
5 FB
GND 2
SW 3
4 VIN
SOT23-5
Figure 2: Pin Configuration
Pin Description
Table 1
Pin Name
Description
Regulator Enable control input. Drive EN above 1.5V to turn on the
1 EN part. Drive EN below 0.3V to turn it off. In shutdown, all functions are
disabled drawing <1μA supply current. Do not leave EN floating.
2 GND Ground.
Power Switch Output. It is the Switch note connection to Inductor. This
3 SW pin connects to the drains of the internal P-CH and N-CH MOSFET
switches.
4
VIN
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a
2.2μF or greater ceramic capacitor.
VFB (Adjustable Version) : Feedback Input Pin. Connect FB to the
5 FB center point of the external resistor divider. The feedback threshold
voltage is 0.6V.
Ordering Information
Order Number
Package Type
YB1680ST25XADJP
SOT23-5
Supplied As
3000 units Tape & Reel
Package Marking
A1XY (Note 1)
Note 1: XY = Manufacturing Date Code
YB1680 Rev.1.0
www.yobon.com.tw
2



Part Number YB1680
Description 600mA Synchronous Step-Down Converter
Maker YOBON TECHNOLOGIES - YOBON TECHNOLOGIES
Total Page 10 Pages
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