YB1682.pdf 데이터시트 (총 9 페이지) - 파일 다운로드 YB1682 데이타시트 다운로드

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YB1682
2A 380KHz 20V PWM Buck DC/DC Converter
Description
The YB1682 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
YB1682 serves as ideal power supply units
for portable devices.
Typical Application Circuit
Features
„ 2A Constant Output Current
„ 140mRDSON Internal Power PMOSFET
Switch
„ Up to 92% Efficiency
„ Fixed 380KHz Frequency
„ Wide 3.6V to 20V Input Voltage Range
„ Output Adjustable from 1.222V to 18V
„ 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
„ White LED Backlighting
„ Handheld PCs and PDAs
„ Mobile Phone
„ DSC and DV Flash Light Application
Pin Configuration
YB1682 Rev.1.0
Figure 1: Typical Application Circuit
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YB1682
2A 380KHz 20V 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. YB1682 operates from a 3.6V to 20VDC
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 YB1682.
Feedback Pin. Through an external resistor divider network, FB
senses the output voltage and regulates it. The feedback threshold
voltage is 1.222V.
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
YB1682SPX8P
SOP-8
Supplied As
2500 units Tape & Reel
Package Marking
Please contact sales
representative
YB1682 Rev.1.0
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YB1682
2A 380KHz 20V PWM Buck DC/DC Converter
Absolute Maximum Ratings
Recommended Operating Conditions
Input Voltage............................. -0.3V to 20V
Feedback Pin Voltage .................-0.3V to VIN
Enable Pin Voltage.................... -0.3V to 12V
Switch Pin Voltage ......................-0.3V to VIN
Power Dissipation .............. Internally Limited
Operating Junction Temperature......... 150°C
Storage Temperature ............ -65°C to 150°C
Input Voltage............................ 3.6V to 20V
Operating Junction Temperature ... -40°C to 125°C
OperatingAmbient Temperature.......-40°C to 85°C
Lead Temperature (Soldering, 10 sec)... 260°C
ESD (HBM).......................................2000V
Note:
Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This
is a stress rating only and functional operation of the device at these or any other conditions above those
indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
Electrical Characteristics
Table 2 (VIN = VRUN = 3.6V, TA=25°C, Test Circuit Figure 1, unless otherwise noted.)
Description
Symbol
Test Conditions
MIN TYP
Input Voltage
VIN
3.6
Shutdown Supply Current
ISTBY
VEN = 0V
30
Supply Current
Feedback Voltage
Feedback Bias Current
Switch Current Limit
ICC VEN = 2V, VFB = 1.3V
VFB VIN = 3.6V to 23V
IFB VFB = 1.3V
ILIM
3.6
1.21 1.222
0.1
3
Oscillator Frequency
FOSC
320 380
EN Pin Threshold
EN Pin Input Leakage
Current
VEN
IH VEN = 2.5V
IL VEN = 0.5V
0.7 1.2
-0.1
-3
Internal PMOS RDSON
RDSON
VIN 12V, VFB =0V
VEN = 12V, IOUT = 2A
140
Max. Duty Cycle
Efficiency
Thermal Shutdown
DMAX
η
TOTSD
VFB = 0V, ISW = 0.1A
VIN = 12V, VOUT = 5V, IOUT = 2A
100
92
165
MAX
20
90
4
1.26
0.5
4
440
1.7
-1
-10
Units
V
µA
mA
V
µA
A
KHz
V
µA
µA
m
%
%
°C
YB1682 Rev.1.0
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YB1682
2A 380KHz 20V PWM Buck DC/DC Converter
Typical Performance Characteristics
EfficiencyV.SLoad(Vin=12V)
Output LoadCurrent(A)
YB1682 Rev.1.0
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Function Block
YB1682
2A 380KHz 20V PWM Buck DC/DC Converter
Figure 3: Function Block
Functional Description
VIN
This is the positive input supply for the IC
switching regulator. A suitable input bypass
capacitor must be present at this pin to
minimize voltage transients and to supply
the switching currents needed by the
regulator.
Gnd
Circuit ground.
SW
Internal switch. The voltage at this pin
switches between (VIN – VGS) and
approximately – 0.5V, with a duty cycle of
approximately VOUT / VIN. To minimize
coupling to sensitive circuitry, the PC board
copper area connected to this pin should
be kept a minimum.
FB
Senses the regulated output voltage to
complete the feedback loop.
EN
Allows the switching regulator circuit to be
shutdown using logic level signals thus
dropping the total input supply current to
approximately 30µA.
Pulling this pin below a threshold voltage of
approximately 0.7V turns the regulator
down, and pulling this pin above 1.3V (up to
a maximum of 12V) shuts the regulator on.
For automatic star up condition, can be
implemented by the addition of a resistive
voltage divider from VIN to GND.
YB1682 Rev.1.0
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