LX1742 데이터 시트보기 (PDF) - Microsemi Corporation
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LX1742 Datasheet PDF : 13 Pages
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INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN) ..................................................................................... -0.3V to 7.0V
Output Voltage (OUT) ................................................................................................25.0V
Feedback Input Voltage (VFB) ..............................................................-0.3V to VIN + 0.3V
Shutdown Input Voltage (VSHDN) ........................................................-0.3V to VIN + 0.3V
PWM Input Amplitude .........................................................................-0.3V to VIN + 0.3V
Analog Adjust Input Voltage (VADJ).................................................................-0.3V to VIN
Source Input Current (ISRC)................................................................................. 500mARMS
Operating Junction Temperature................................................................................ 150°C
Storage Temperature Range.........................................................................-65°C to 150°C
Peak Package Solder Reflow Temp. (40 second max. exposure).................. 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DU Plastic MSOP 8-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
206°C/W
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
39°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJC). The θJA numbers are guidelines for the
thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
PACKAGE PIN OUT
SW
IN
FB
SHDN
1
8
2
7
3
6
4
5
DU PACKAGE
(Top View)
OUT
GND
CS
ADJ
RoHS / Pb-free 100% Matte Tin Lead Finish
NAME
IN
FB
SHDN
SW
CS
GND
ADJ
OUT
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
Unregulated IC Supply Voltage Input – Input range from +1.6V to 6.0V. Bypass with a 1µF or greater capacitor.
Feedback Input – Connect to a resistive divider network between the output and GND to set the output voltage between VCC
(IN) and 25V. The feedback threshold is 1.20V.
Active-Low Shutdown Input – A logic low shuts down the device and reduces the supply current to 0.1µA. When
shutdown, the LX1742 isolates the output from the input by turning off the internal MOSFET between LX and OUT.
Connect SHDN to VCC for normal operation.
Inductor Switching Connection – Internally connected to the drain of a 28V N-channel MOSFET. LX is high impedance in
shutdown.
Current-Sense Amplifier Input – Connecting a resistor between CS and GND sets the peak inductor current limit.
Common terminal for ground reference.
PWM Signal Input – Connects to the internal reference, via an internal filter and gain resistor, allowing a dynamic output
voltage adjustment ±15% in corresponding to a varying duty cycle. 50% duty cycle yields a nominal output set via the FB
pin (See Note) or ADJ input voltage range from 0.9V to 1.5V DC
Output voltage is adjustable up to 25V (maximum).
Copyright © 2000
Rev. 1.0b, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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