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LV1482SN 데이터시트 PDF




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부품번호 LV1482SN 기능
기능 Synchronous Step-Down DC/DC Converter
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LV1482SN 데이터시트, 핀배열, 회로
LV1482SN
2A, 20V, 550KHz, Synchronous Step-Down DC/DC Converter
FEATURES
4.75V to 20V input voltage
Output adjustable from 0.923V to 18V
Output current up to 2A
Integrated 0.085Ω power MOSFET switches
Shutdown current 1μA typical
Efficiency up to 93%
550KHz fixed frequency
Programmable soft start
Over current protection
Over temperature protection
RoHS Compliant and 100% Lead (Pb) Free
APPLICATIONS
Distributed power systems
Networking systems
FPGA, DSP, ASIC power supplies
Notebook computers
Green electronics or appliance
ORDERING INFORMATION
PART
PACKAGE RoHS
LV1482SN SOP-8L (EP) Yes
Ship, Quantity
Tape and Reel
DESCRIPTION
The LV1482SN is a 550KHz fixed frequency
PWM synchronous step-down regulator. The
LV1482SN is operated from 4.75V to 20V, the
generated output is adjustable from 0.923V to
18V, and the output current can be up to 2A.
The integrated two MOSFET switches is with
turn on resistance of 0.085Ω. Current mode
control provides fast transient response and
cycle-by-cycle over current protection. The
shutdown current is 1μA typical. Adjustable
soft start prevents inrush current at turn on.
The LV1482SN is with thermal shutdown.
The LV1482SN is RoHS compliant and 100%
lead (Pb) free.
Pins Configuration
Top View (with EP)
BS 1
8 SS
IN 2
SW 3
GND 4
Exposed
Pad
connect
to GND
7 EN
6 COMP
5 FB
Typical Application Circuit
Note: R5 and C7 are optional.
Details please see the DVT report.
DS-21; Apr. 09, 2012
Copyright © ZillTek Technology Corp.
-1-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390




LV1482SN pdf, 반도체, 판매, 대치품
LV1482SN
Typical Characteristics
VIN = 12V, VO = 3.3V, L = 10μH, C1 = 10μF, C2 = 22μF, TA = +25°C, unless otherwise noted.
Start UP & Inrush Current 12V→3.3V (Load 1A)
Shut Down (Iout 1A→Shut down)
Output Ripple (12V => 3.3V, Load=2A)
Output Ripple (12V => 3.3V, Load=1A)
Output Ripple (12V => 3.3V, Load=0A)
Dynamic Load (Vout=3.3V)
DS-21; Apr. 09, 2012
Copyright © ZillTek Technology Corp.
-4-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390

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LV1482SN 전자부품, 판매, 대치품
LV1482SN
maximum switch current limit. Also, make sure that the
peak inductor current is below the maximum switch
current limit. The inductance value can be calculated by:
L = [ VOUT / (fS × ΔIL) ] × (1 − VOUT/VIN)
Where VOUT is the output voltage, VIN is the input voltage,
fS is the switching frequency, and ΔIL is the peak-to-peak
inductor ripple current.
Choose an inductor that will not saturate under the
maximum inductor peak current. The peak inductor
current can be calculated by:
ILP = ILOAD + [ VOUT / (2 × fS × L) ] × (1 − VOUT/VIN)
Where ILOAD is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and any EMI
requirements.
Optional Schottky Diode
During the transition between high-side switch and
low-side switch, the body diode of the low-side power
MOSFET conducts the inductor current. The forward
voltage of this body diode is high. An optional Schottky
diode may be paralleled between the SW pin and GND
pin to improve overall efficiency. Table 1 lists example
Schottky diodes and their Manufacturers.
Part
Number
B130
SK13
MBRS130
Voltage and
Current Rating
30V, 1A
30V, 1A
30V, 1A
Vendor
Diodes Inc.
Diodes Inc.
International Rectifier
Table 1: Diode selection guide.
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter while
maintaining the DC input voltage. Use low ESR
capacitors for the best performance. Ceramic capacitors
are preferred, but tantalum or low-ESR electrolytic
capacitors may also suffice. Choose X5R or X7R
dielectrics when using ceramic capacitors.
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple current
rating. The RMS current in the input capacitor can be
estimated by:
IC1 = ILOAD × [ (VOUT/VIN) × (1 − VOUT/VIN) ]1/2
The worst-case condition occurs at VIN = 2VOUT, where IC1
= ILOAD/2. For simplification, choose the input capacitor
whose RMS current rating greater than half of the
maximum load current.
The input capacitor can be electrolytic, tantalum or
ceramic. When using electrolytic or tantalum capacitors,
a small, high quality ceramic capacitor, i.e. 0.1μF, should
be placed as close to the IC as possible. When using
ceramic capacitors, make sure that they have enough
capacitance to provide sufficient charge to prevent
excessive voltage ripple at input. The input voltage
ripple for low ESR capacitors can be estimated by:
ΔVIN = [ ILOAD/(C1 × fS) ] × (VOUT/VIN) × (1 − VOUT/VIN)
Where C1 is the input capacitance value.
Output Capacitor
The output capacitor is required to maintain the DC
output voltage. Ceramic, tantalum, or low ESR
electrolytic capacitors are recommended. Low ESR
capacitors are preferred to keep the output voltage
ripple low. The output voltage ripple can be estimated
by:
ΔVOUT = [ VOUT/(fS × L) ] × (1 − VOUT/VIN)
× [ RESR + 1 / (8 × fS × C2) ]
Where C2 is the output capacitance value and RESR is the
equivalent series resistance (ESR) value of the output
capacitor.
In the case of ceramic capacitors, the impedance at the
switching frequency is dominated by the capacitance.
The output voltage ripple is mainly caused by the
capacitance. For simplification, the output voltage ripple
can be estimated by:
ΔVOUT = [ VOUT/(8 × fS2 × L × C2) ] × (1 − VOUT/VIN)
In the case of tantalum or electrolytic capacitors, the
ESR dominates the impedance at the switching
frequency. For simplification, the output ripple can be
approximated to:
ΔVOUT = [ VOUT/(fS × L) ] × (1 − VOUT/VIN) × RESR
The characteristics of the output capacitor also affect
the stability of the regulation system. The LV1482SN can
be optimized for a wide range of capacitance and ESR
values.
Compensation Components
LV1482SN employs current mode control for easy
DS-21; Apr. 09, 2012
Copyright © ZillTek Technology Corp.
-7-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390

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부품번호상세설명 및 기능제조사
LV1482SN

Synchronous Step-Down DC/DC Converter

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