SIPEX SP7686ER

SP7686EB
Evaluation Board Manual
2.7V to 5.5V Input Range
High Efficiency in 1X mode, high VOUT in 2X mode
Small 2x3mm 8-Pin DFN Package
2.4MHz Switching Frequency
Integrated Design with Minimal Components.
3.5sec Time out function to protect the LED
Thermal shutdown protection
Built-in over-voltage & over-current protection
One line serial interface
Output Current up to 500mA
Use with 1 cell Lithium Ion Battery
DESCRIPTION AND BOARD SCHEMATIC
The SP7686EB Evaluation Board is a compact circuit including the SP7686 in 3x2mm DFN and 3
small 0603 capacitors which can provide a stable drive current for a 1W LED such as the AOT White
LED, Lumi-LEDs Luxeon I or PWF1 type light sources. The evaluation board is a completely
assembled and tested surface mount board which provides easy probe access points to all SP7686
inputs and outputs so that the user can quickly connect and measure electrical characteristics and
waveforms.
SP7686EB Schematic
TO GET STARTED:
1. Connect VIN from VIN to GND (VIN range 2.7V to 4.2V).
2. Apply a combination of positive pulses on CTRL pin to enable the part.
Rev 3/20/07
SP7686EB Evaluation Board Manual
Copyright 2007 Sipex Corporation
POWER SUPPLY DATA
Efficiency vs Vin
Iout vs VIn
500
100
450
90
400
80
Efficiency (%)
Iout (mA)
350
Flash 440mA
300
Torch 160mA
250
Torch 88mA
200
70
60
50
40
30
Flash 440mA
100
20
Torch 160mA
50
10
Torch 88mA
0
0
150
3.0
3.3
3.6
3.9
3.0
4.2
3.3
Vin (V)
3.6
3.9
4.2
Vin (V)
Figure 1. Output Current with PWF1 LED
Figure 2. Output Efficiency with PWF1 LED
CTRL
CTRL
Vout
Vout
VFB
VFB
Iin:
0.5A/div
Iin:
0.5A/div
Figure 3. Start Up, Iout = 80mA, Vin=4.2V
Figure 4. Start Up, Iout = 450mA, Vin=4.2V
CTRL
CTRL
VFB
Vout
Vout
Iin:
0.2A/div
VFB
Iin:
1A/div
Figure 5. LED Shorted, Vin=4.2V
Figure 6. LED Open, Vin=4.2V
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EVALUATION BOARD LAYOUT
NOT USED
FIGURE 7: SP7686EB COMPONENT PLACEMENT
NOT USED
FIGURE 8: SP7686EB PC LAYOUT TOP SIDE
NOT USED
FIGURE 9: SP7686EB PC LAYOUT BOTTOM SIDE
Note: “Not Used” section of the board is for optional CTRL PULSE digital circuit – consult factory
Applications for details.
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TABLE1: SP7686EB LIST OF MATERIALS
3x2mm DFN - 8 pin
Manufacturers/
Website
www.sipex.cpm
10uF/6.3V/X5R
0603
www.murata.com
GRM188R61A225K
2.2uF/10V/X5R
0603
www.murata.com
CF
GRM155R60J224K
0.22uF/6.3V/X5R
0402
www.murata.com
RFB
CRCW0603R680F
0.68Ω/1%,
Ω/1%, 1/10W
0603
www.vishay.com
61303611121
3-Pin 2.54mm Header
6.0x2.54mm
www.we-online.com
60900213421
2.54mm Jumper
5.0x2.54mm
www.we-online.com
0300-11501-4727100
Test point female pin
.042" Dia
Mil-Max (digi-key)
Part Reference
Part Number
U1
SP7686ER
CIN
GRM188R60J106M
COUT
J1
TP(VIN,GND,VOUT,CTRL&VFB)
Value
Size
ORDERING INFORMATION
Model
Temperature Range
Package Type
SP7686EB............................. ……-40°C to +85°C...................SP7686AEB Evaluation Board
SP7686ER.....................................-40°C to +85°C...................................... 8-pin 3x2 DFN
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