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YOBON TECHNOLOGIES
YOBON TECHNOLOGIES


YB1685

2A 380KHz 32V PWM Buck DC/DC Converter


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YB1685 pdf
YB1685
2A 380KHz 32V PWM Buck DC/DC Converter
Description
The YB1685 is a 380 KHz fixed frequency
monolithic step down switch mode
regulator with a built in internal Power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation. The
device includes a voltage reference,
oscillation circuit, error amplifier, internal
PMOS and etc.
The PWM control circuit is able to adjust
the duty ratio linearly from 0 to 100%. An
enable function, an over current protection
function and a short circuit protection
function are built inside. An internal
compensation block is built in to minimize
external component count.
The YB1685 serves as ideal power supply
units for portable devices.
Features
„ 2A Constant Output Current
„ 140mRDSON Internal Power PMOSFET
Switch
„ Up to 92% Efficiency Fixed 380KHz
Frequency
„ Wide 3.6V to 32V Input Voltage Range
„ Output Adjustable from 1.235V to 30V
„ Output Current Protection
„ Built in Frequency Compensation
„ Built in Thermal Shutdown Function
„ Built in Current Limit Function
„ SOP8 Package is Available
„ The Minimum Dropout up to 0.3V
„ Pb-free Package
Applications
„ Portable DVD
„ LCD Monitor / TV
„ Battery Charger
„ ADSL Modem
„ Telecom / Networking Equipment
Typical Application Circuit
YB1685 Rev.1.0
Figure 1: Typical Application Circuit
www.yobon.com.tw
1



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Pin Configuration
YB1685
2A 380KHz 32V PWM Buck DC/DC Converter
NC 1
8 NC
VIN 2
7 EN
SW 3
6 NC
GND 4
5 FB
SOP-8
Figure 2: Pin Configuration
Pin Description
Table 1
Pin
Name
1,6,8
NC
2 VIN
3 SW
4 GND
5 FB
7 EN
Not Connect.
Description
Supply Voltage Input Pin. YB1685 operates from a 3.6V to 32VDC
voltage.
Bypass VIN to GND with a suitably large capacitor to eliminate noise
on the input.
Power Switch Output Pin. SW is the switch node that supplies
power to the output.
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor ground
path to prevent switching current spikes from inducing voltage
noise into YB1685.
Feedback Pin. Through an external resistor divider network, FB
senses the output voltage and regulates it. The feedback threshold
voltage is 1.235V.
Enable Pin. EN is a digital input that turns the regulator on or off.
Drive EN pin high to turn on the regulator, drive it low to turn it off.
Ordering Information
Order Number Package Type
YB1685SPX8P
SOP-8
Supplied As
2500 units Tape & Reel
Package Marking
Please contact sales
representative
YB1685 Rev.1.0
www.yobon.com.tw
2



Part Number YB1685
Description 2A 380KHz 32V PWM Buck DC/DC Converter
Maker YOBON TECHNOLOGIES - YOBON TECHNOLOGIES
Total Page 9 Pages
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