Step-Up Converter. FSP3307 Datasheet

FSP3307 Converter. Datasheet pdf. Equivalent

Part FSP3307
Description White LED Step-Up Converter
Feature FSP3307 WHITE LED STEP-UP CONVERTER N FEATURES s Inherently Matched LED Current s Drives Up to 8 .
Manufacture Linear
Datasheet
Download FSP3307 Datasheet



FSP3307
FSP3307
WHITE LED STEP-UP CONVERTER
FEATURES
s Inherently Matched LED Current
s Drives Up to 8 LEDs from a 3.6V Supply
s No External Schottky Diode Required
s 1.2MHz Switching Frequency
s Automatic Soft-Start
s Open LED Protection
s High Efficiency: 81%
s Requires Only 0.22uF Output Capacitor
s Low Profile (1mm) SOT-23 Packaging
APPLICATION
s Cellular Phones
s PDAs, Handheld Computers
s Digital Cameras
s MP3 Players
s GPS Receivers
DESCRIPTIO
The FSP3307 IS step-up DC/DC converters
designed to drive up to six LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED
currents and eliminates the need for ballast resistors.
These devices integrate the Schottky diode required exter-
nally on competing devices. Additional features include
output voltage limiting when LEDs are disconnected, one-
pin shutdown and dimming control. The FSP3307has
internal soft-start.
TheFSP3307switches at 1.2MHz, allowing the use of tiny
external components. Constant frequency switching
results in low input noise and a small output capacitor.
Just 0.22µF is required for 4-, 6- or 8-LED applications.
The FSP3307 is available in low profile(1mm)6-lead
TYPICAL APPLICATION
FSP3307
Figure 1. Li-Ion Powered Driver for Eight White LEDs
Conversion Efficiency
82 VIN = 3.6V
80 4 LEDs
78
76
74
72
70
68
66
64
62
60
0 5 10 15
LED CURRENT (mA)
20
1



FSP3307
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN) ................................................. 16V
SW Voltage ............................................................. 36V
FB Voltage ................................................................ 2V
CTRL Voltage .......................................................... 10V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SW 1
GND 2
FB 3
6 IN
5 Vout
4 CTRL
SOT-23-6
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VCTRL = 3V, unless otherwise noted.
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltag
Feedback Voltage
FB Pin Bias Current
Supply Current
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch VCESAT
Switch Leakage Current
VCTRL for Full LED Current
VCTRL to Shut Down Chip
CTRL Pin Bias Current
Soft-Start Time
Schottky Forward Drop
Schottky Leakage Current
CONDITIONS
0°C TA 85°C
Not Switching
CTRL = 0V
ISW = 250mA
VSW = 5V
TA = 85°C
TA = –40°C
ID = 150mA
VR = 30V
q
q
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The FSP3307are guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
MIN
2.7
188
10
1.9
2.0
0.8
90
225
1.8
48
40
60
TYP MAX UNITS
V
16 V
200 212 mV
35 100 nA
2.6 3.3 mA
3.2 5.0 uA
1.2 1.6 MHz
93 %
340 mA
30 mV
0.01 5 uA
V
50 mV
60 70 uA
50 60 uA
75 90 uA
600 µs
0.7 V
4 uA
2





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