Preliminary Datasheet
LP6483
340KHz, 3A Step-down Converter With Soft-Start
General Description
Features
The LP6483 contains an independent 340KHz
Input Voltage Range: 4.5V to 30V
Output Voltage Range: 0.6V to 12V
and a synchronous rectifier for high efficiency
3A Load Current
without an external Schottky diode. The converter
Up to 95% Efficiency
340KHz Switching Frequency
Short Circuit Protection
cycle-by-cycle limit with current mode control.
Thermal Fault Protection
The LP6483 is available in a ESOP8 package and
ESOP8 Package
RoHS Compliant and 100% Lead (Pb)-Free
constant frequency, current mode, PWM step -down
converters. The converter integrates a main switch
can supply 3A of load current. The LP6483 can also
run at 98% duty cycle for low dropout applications.
It
provides
fast
transient
response
and
is rated over the -40°C to 85°C temperature range.
Order Information
Typical Application Circuit
LP6483 □ □ □
F: Pb-Free
VIN
Vout
VIN
SW
10uF*2
10uH
10uF*2
EN
R1
Package Type
SP: ESOP8
GND
FB
R2
Applications
Portable Media Players
Cellular and Smart mobile phone
Device
Marking
Package
Shipping
PDA/DSC
LP6483SPF
LPS
SP:ESOP8
4K/REEL
GPS Applications
Marking Information
LP6483
YWX
Y: Year code. W: Week code. X: Batch numbers.
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 1 of 7
Preliminary Datasheet
LP6483
Functional Pin Description
Package Type
Pin Configurations
NC
1
VIN
2
SW
3
6
NC
GND
4
5
FB
ESOP-8
9
8
NC
7
EN
GND
Pin Description
Pin
Name
1/6/8
NC
No Connector.
2
VIN
Supply Input.
3
SW
4/9
GND
5
FB
7
EN
LP6483-00
Description
Switch Mode Connection to Inductor. This pin connects to the drains of the internal main
and synchronous power MOSFET switches.
Ground.
Feedback Input. Connect FB to the center point of the external resistor divider. Normal
voltage for this pin is 0.6V.
Enable Control Input. Drive EN above 2.5V to turn on the Channel. Drive EN below 0.4V
to turn it off (shutdown current < 0.1µA).
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 2 of 7
Preliminary Datasheet
LP6483
Function Diagram
Absolute Maximum Ratings Note 1
VIN/SW/EN to GND -------------------------------------------------------------------------------------------------------------- 36V
FB to GND (VFB) ------------------------------------------------------------------------------------------------------- -0.3V to 6V
Junction Temperature ------------------------------------------------------------------------------------------------------- 150°C
Storage Temperature --------------------------------------------------------------------------------------------- -65℃ to 165℃
Operating Ambient Temperature Range (TA) --------------------------------------------------------------- -40℃ to 85°C
Maximum Soldering Temperature (at leads, 10sec) ----------------------------------------------------------------- 260℃
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Thermal Information
Maximum Power Dissipation (SOP8, PD,TA=25°C) --------------------------------------------------------------------- 2W
Thermal Resistance (SOP8, θJA) --------------------------------------------------------------------------------------- 50℃/W
ESD Susceptibility
HBM(Human Body Mode) ----------------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) ------------------------------------------------------------------------------------------------------------ 200V
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 3 of 7
Preliminary Datasheet
LP6483
Electrical Characteristics
VIN=12V, VEN=5V, L=10uH,TA=25℃, unless otherwise noted
Symbol
Parameter
Condition
Min
Typ
VIN
Input Voltage
VIN-OVP
VIN OVP Voltage Lockout Threshold
VOUT
Output Voltage Range
IQ
Quiescent Current
VIN=12V
10
mA
ISHDN
Shutdown Current
EN=GND
10
µA
ILIM
P-Channel Current Limit
4.5
A
RDS(ON)_H
High-Side Switch On Resistance
70
mΩ
RDS(ON)_L
Low-Side Switch On Resistance
50
mΩ
ILX_LEAK
LX Leakage Current
VEN=0V, VSW=0 or 5V, VIN=5V
1
µA
VFB
Feedback Threshold Voltage Accuracy
VIN=12V
IFB
FB Leakage Current
VOUT=5.0V
fOSC
Oscillator Frequency
tS
Startup Time
TSD
4.5
Max
Units
30
V
12
V
32
0.6
0.588
0.6
0.612
V
30
nA
340
KHz
2.7
mS
Over-Temperature Shutdown Threshold
150
℃
THYS
Over-Temperature Shutdown Hysteresis
20
℃
VEN(L)
Enable Threshold Low
VEN(H)
Enable Threshold High
IEN
Enable Current
From Enable to Output Regulation
1
2.5
VIN=12V, VEN=12V
V
V
5
µA
Note: Output Voltage: VOUT = VFB × ( 1 + R1 / R2 ) Volts;
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 4 of 7
Preliminary Datasheet
LP6483
Typical Operating Characteristics
Efficiency VS. Iout @Vout=5V
100
95
90
Efficiency(%)
85
80
75
70
65
VIN=9V
60
VIN=12V
55
VIN=15V
50
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
Iout(A)
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 5 of 7
Preliminary Datasheet
LP6483
ripple current and lower output ripple voltage.
Application Information
The LP6483 operates by a constant frequency,
current mode architecture. The output voltage is set
by an external divider returned to the FB pin. An error
amplifier compares the divided output voltage with a
reference voltage of 0.6V and adjusts the peak
inductor current accordingly.
However, the larger value inductor has a larger
physical size, higher series resistance, and lower
saturation current. Choose an inductor that does not
saturate under the worst-case load conditions. A
good rule for determining the inductance is to allow
the peak-to-peak ripple current in the inductor to be
approximately 30% of the maximum load current.
Thermal Protection
The inductance value can be calculated by the
The total power dissipation in LP6483 is limited by a
equation:
thermal
protection
circuit.
When
the
device
temperature rises to approximately 150℃, this circuit
turns off the output, allowing the IC to cool. The
L=(VOUT)×(VIN-VOUT)/(VIN×f×∆I)
Output Capacitor
thermal protection circuit can protect the device from
The output capacitor is required to maintain the DC
being damaged by overheating in the event of fault
output voltage. Low ESR capacitors are preferred to
conditions. Continuously running the LP6483 into
keep
thermal shutdown degrades device reliability.
characteristics of the output capacitor also affect the
the
output
voltage
ripple
low.
The
stability of the regulator control loop. Ceramic,
Setting Output Voltage
tantalum, or low ESR electrolytic capacitors are
The output voltage is set with a resistor divider from
recommended. In the case of ceramic capacitors, the
the output node to the FB pin. It is recommended to
impedance at the switching frequency is dominated
use divider resistors with 1% tolerance or better. To
by the capacitance. The output voltage ripple is
improve efficiency at very light loads consider using
estimated to be:
larger value resistors. If the values are too high the
VRIPPLE=1.4×VIN×(fLC/f)2
regulator is more susceptible to noise and voltage
errors from the FB input current are noticeable. For
Where VRIPPLE is the output ripple voltage, V IN is the
most applications, a resistor in the 10kΩ to 1MΩ
input voltage, fLC is the resonant frequency of the LC
range is suggested for RUP and RDN. The output
filter, f is the switching frequency. In the case of
voltage is established by the following equations
tantalum or low ESR electrolytic capacitors, the ESR
VOUT=0.6V×(1+R1/R2)
dominates the impedance at the switching frequency,
and so the output ripple is calculated as:
Where VREF is 0.6V.
VRIPPLE≈∆I×RESR
Inductor Selection
The inductor is required to supply constant current to
the output load while being driven by the switched
Where VRIPPLE is the output voltage ripple, ΔI is the
inductor ripple current, and RESR is the equivalent
series resistance of the output capacitors.
input voltage. A larger value inductor results in less
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 6 of 7
Preliminary Datasheet
LP6483
Packaging Information
ESOP8
LP6483-00
May.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 7 of 7
很抱歉,暂时无法提供与“LP6483SPF”相匹配的价格&库存,您可以联系我们找货
免费人工找货- 国内价格
- 5+2.27859
- 50+1.82877
- 150+1.63610
- 500+1.39558
- 2500+1.19513