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YB1680 데이터시트 PDF




YOBON TECHNOLOGIES에서 제조한 전자 부품 YB1680은 전자 산업 및 응용 분야에서
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부품번호 YB1680 기능
기능 600mA Synchronous Step-Down Converter
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YB1680 데이터시트, 핀배열, 회로
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




YB1680 pdf, 반도체, 판매, 대치품
YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
Typical Performance Characteristics
YB1680 Rev.1.0
www.yobon.com.tw
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YB1680 전자부품, 판매, 대치품
Function Block
YB1680
1.5MHz, 600mA Synchronous Step-Down Converter
Figure 3: Function Block
Operation
YB1680 is a monolithic switching mode
Step-Down DC-DC converter. It utilizes
internal MOSFETs to achieve high
efficiency and can generate very low output
voltage by using internal reference at 0.6V.
It operates at a fixed switching frequency,
and uses the slope compensated current
mode architecture. This Step-Down DC-DC
Converter supplies 600mA output current at
VIN = 3V with input voltage range from 2.5V
to 5.5V.
Current Mode PWM Control
Slope compensated current mode PWM
control provides stable switching and
cycle-by-cycle current limit for excellent
load and line responses and protection of
the internal main switch (P-Ch MOSFET)
and synchronous rectifier (N-CH MOSFET).
During normal operation, the internal P-Ch
MOSFET is turned on for a certain time to
ramp the inductor current at each rising
edge of the internal oscillator, and switched
off when the peak inductor current is above
the error voltage. The current comparator,
ICOMP, limits the peak inductor current.
When the main switch is off, the
synchronous rectifier will be turned on
immediately and stay on until either the
inductor current starts to reverse, as
indicated by the current reversal
comparator, IZERO, or the beginning of the
next clock cycle. The OVDET comparator
controls output transient overshoots by
YB1680 Rev.1.0
www.yobon.com.tw
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