Preliminary Datasheet
1.2MHz,30V/1A High Performance, Boost Converter
General Description
The LP3315 is a 1.2MHz PWM boost switching
regulator designed for constant-voltage boost
applications. The LP3315 can drive a string of up to
30V. The LP3315 implements a constant frequency
1.2MHz PWM control scheme. The high frequency
PWM operation also saves board space by reducing
external component sizes. To improve efficiency, the
feedback voltage is set to 1250mV, which reduces
the power dissipation in the voltage setting resistor.
Highly integration and internal compensation
network minimizes as 5 external component counts.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency.
LP3315
Features
High Efficiency: 90%
1.2MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 30V
Guaranteed 13V/200mA Output with 5V input
Operating Range : 2.7V to 5.5V
Shutdown Supply Current:<1uA
Programmable Soft-star
Available in SOT23-6/SOT23-5 Package
Minimize the External Component
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Panel
Bais Voltage supply
OLED
Backlight driver
Notebook Computers
Portable
Applications
MID/PTV
Ordering Information
LP3315
Typical Application Circuit
Vin
VOUT
4.7uH
1
C2
2.2uF
C3
1nF
F: Pb-Free
C1
4.7uF
Package:
B5: SOT23-5
5
Vin
R1
210K
LX
FB
SHDN
GND
3
Pin Configurations
ON
OFF
4
R2
30K
LP3315
Marking information
Please view website
.
Device No.
LP3315B5F
Marking
LPS
Fbxxx
x represents the date( year month day)of the producing day
of the products.
LP3315– 00
Version1.0 Datasheet
Feb.-2012
www.lowpowersemi.com
Page 1 of 8
2
Package
SOT23-5
Shipping
3K/Reel
Preliminary Datasheet
Functional pin description
SOT-23-5
1
2
3
Pin Name
LX
GND
FB
Pin Function
LP3315
Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track
area to reduce EMI.
Ground Pin
Feedback Reference Voltage Pin. Series connect a resistor between Vout and
ground as a voltage sense. The feedback voltage is 1250mV.
Chip Enable (Active High). Voltage sensing input to trigger the function of
over voltage protection. Note that this pin is high impedance. There should
be a pull low 100kΩ resistor connected to GND when the control signal is
floating.
Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the input
noise.
4
SHDN
5
Vin
Function Block Diagram
LX
VIN
+
-
+
FB
-
+
EN
-
GND
LP3315– 00
Version1.0 Datasheet
Feb.-2012
www.lowpowersemi.com
Page 2 of 8
Preliminary Datasheet
Absolute Maximum Ratings
LP3315
Supply Input Voltage---------------------------------------------------------------------------------------------------−0.3V to 6.0V
LX Input Voltage --------------------------------------------------------------------------------------------------------−0.3V to 30V
The Other Pins ----------------------------------------------------------------------------------------------------------−0.3V to 5.5V
Power Dissipation, P
D
@ T
A
= 25°C TSOT-23-5/6-----------------------------------------------------------------------0.455W
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C
Operation Temperature Range ---------------------------------------------------------------------------------
−
40°C to 80°C
Storage Temperature Range ----------------------------------------------------------------------------------------
−
65°C to 150°C
Electrical Characteristics
Parameter
System Supply Input
Operation voltage Range
Under Voltage Lock Out
Supply Current
Shut Down Current
Line Regulation
Oscillator
Operation Frequency
Maximum Duty Cycle
Feedback Voltage
MOSFET
On Resistance of MOSFET
SW Current Limit
Protection
Shut Down Voltage
Enable on Voltage
V
EN
V
EN
R
DS(ON)
ILM
0.4
1
Ω
A
LP3315
F
OSC
93
1.22
1.25
1.28
1.2
MHz
%
V
V
DD
V
DD
I
DD
I
DD
FB=1.2V, Switch
V
EN
< 0.4V
V
IN
: 3.0~4.3V
2.7
6
2.4
430
0.1
2
V
V
uA
uA
%
Symbol
Test Condition
Min
Typ.
Max
Units
2.2
2.6
550
1
0.3
1.0
V
V
LP3315– 00
Version1.0 Datasheet
Feb.-2012
www.lowpowersemi.com
Page 3 of 8
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