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SP4438
Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications
s Patent Pending Output Waveshaping s Waveshaped Output Optimized For Low Acoustic Noise And Maximum Efficiency s Reduced Supply Current And Standby Current s Up to15cd/m2 For Cell Phone Sized EL Lamps (2 to 3 sq. in.) s Waveshaped Output And Low Frequency Operation Minimize Stress On EL Lamp To Extend Its Lifetime s Uses 820H, Sub-2mm Coils s Gradual Rising And Falling Edges Minimizes EMI s +2.7V To +3.3V Battery Operation s Space-Saving 8-pin MSOP package APPLICATIONS s Cellular Radios s Wireless Communication Products
DESCRIPTION The SP4438 device is a low noise, high voltage output DC-AC inverter designed to drive electroluminescent lamps to backlight liquid crystal display and keypads used in cellular phones, cordless phones, 2-way radios, and other wireless communication products. The output waveform of the SP4438 device is ideal for cell phone applications requiring low acoustic noise performance. One external resistor is used to set the internal oscillator frequency and one inductor is required to generate the high voltage AC output to drive an EL lamp up to 3 square inches in size. The SP4438 operates from a +3.0V battery source and has a low power standby mode that draws less than 1A, making it ideal for low-power cellular applications. All input pins are ESD protected with internal diodes to VDD and VSS. The SP4438 is offered in a space-saving 8-pin MSOP package.
VBATT
VDD 1 ELEN 2 ROSC 3 VSS 4 SP4438
8
EL1
ELEN 2 L1 820H/14
7 EL2 6 5 CINT COIL
C1 0.1F C2 1nF VDD ROSC 714k 1 ROSC 3 4
SP4438
5 6
COIL D1 1N4148
CINT
8 VSS EL1
7 EL2
CINT 47nF
EL Lamp
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Supply Voltage (VDD to VSS)........................-0.3V, +5V Operating Temperature.......................-40C to +85C Storage Temperature........................-65C to +150C Power Dissipation Per Package 8-pin MSOP (derate 4.85mW/OC above +70OC).........................400mW
SPECIFICATIONS
VDD = +2.7V to +3.3V, LCOIL = 820H/14, ROSC = 714k, EL Lamp Load = (8nF + 2.5k)/1M, and TAMB = -40OC to +85OC. TAMB = 25OC for typical values unless otherwise noted.
PARAMETER INPUT CHARACTERISTICS Supply Voltage, VDD Supply Current, ICOIL+IDD Coil Voltage, VCOIL ELEN Input Voltage, VELEN LOW: EL OFF HIGH: EL on ELEN Input Impedance Shutdown Current, ISD=ICOIL+IDD INDUCTOR DRIVE Coil Frequency, fCOIL Coil Duty Cycle Peak Coil Current, IPK-COIL EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage, VP-P
MIN.
TYP.
MAX.
UNITS
CONDITIONS
2.7
3.0
3.3 30
V mA V VDD = +3.0V
VDD -0.25 VDD-0.25 1 0 VDD 3
9
0.25V VDD+0.25
V
M 1 A VELEN = LOW,VDD = +3.0V
26 23
32
43 45
kHz %
ROSC = 714k,TAMB = +25OC TAMB = -40OC to +85OC,VDD = +3.0V
90 100
mA
190 175 130 120
250
336 348
Hz
TAMB = +25OC,VDD = +3.0V,with load TAMB = -40OC to +85OC TAMB = +25OC,VDD = +3.0V,with load TAMB = -40OC to +85OC TAMB = +25OC,VDD = +3.0V, NOTE 1 TAMB = +25OC,VDD = +3.0V,with load, measured from 10% to 90%
145 140 26
VP-P dBSPL 1.0 ms
Audible Noise Rise Time .55
0.8
NOTE 1: Audible Noise is measured inside an acoustic sound chamber. The Sound Level Meter is a B&K Mediator 2238, A-weighted with Condenser Mic type 4188 positioned 1/4 inch above the lamp in an 8 cubic inch volume. See Figure 5 on page 6.
Rev. 11/13/00 SP4438 Ultra-Quiet Electroluminescent Lamp Driver (c) Copyright 2000 Sipex Corporation
2
PINOUT
VDD 1 ELEN 2 ROSC 3 VSS 4 SP4438
8
EL1
7 EL2 6 5 CINT COIL
PIN ASSIGNMENTS Pin 1 -- VDD -- Positive Battery Power Supply. Connect such that +2.7V < VDD < +3.3V. Pin 2 -- ELEN -- Electroluminescent Lamp Enable. When driven HIGH, this input pin enables the EL driver outputs for EL1 and EL2. This pin has an internal pulldown resistor. Pin 3 -- ROSC -- Oscillator Resistor. Connecting a resistor to this input pin sets the frequency of the internal clock. Pin 4 -- VSS -- Power Supply Common. Connect to the lowest circuit potential, typically ground. Pin 5 -- COIL -- The inductor for the EL lamp is connected from VDD to this input pin. Pin 6 -- CINT -- Integrating Capacitor. An integrating capacitor (47nF typical) connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamp. Connecting a fast recovery diode from COIL to CINT increases the light output of the EL lamp. Pin 7 -- EL2 -- Electroluminescent Lamp Output 2. This is a high voltage lamp driver output pin to connect to the EL lamp. Pin 8 -- EL1 -- Electroluminescent Lamp Output 1. This is a high voltage lamp driver output pin to connect to the EL lamp.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
3
VBATT
ELEN
2
L1 820H/14
SP4438
5 VDD ROSC 714k 1 6 ROSC 3 4 C1 0.1F C2 1nF VSS 8 EL1 7 EL2
COIL D1 1N4148
CINT
CINT 47nF
EL Lamp
Figure 1: Typical Operating Circuit for the SP4438. Note: C1 should be close to L1.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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VBATT
VDD 1 5 COIL
L1 820H/14
SP4438
ROSC 714k ROSC 3
OSC
D1 1N4148 6 CINT CINT 47nF
C1 0.1F
C2 1nF
PMOS
PMOS
Q FF7 Q ELEN 2
BRIDGE CONTROL
DMOS DMOS
4 VSS
8 EL1
7 EL2 EL Lamp
Figure 2: Internal Block Diagram of the SP4438
Figure 3: EL Differential Output Waveform of the EL1 and EL2 Outputs of the SP4438
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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EL Lamp Noise Measurement Set-Up
1" 2" Microphone Type 4188 Bruel & Kjaer 2238 Mediator A-Weighting dBSPL Measurement Photometer Tek-J17 Aux 1 Anechoic Chamber HP8903A Audio Analyzer - SPCL 3.1, 1.17 Preamplifier with 30kHz High Pass Filter
4"
EL Lamp
Differential Voltage Probe
Current Probe Tek754C Digital Osciliscope
Monitor
Voltage Waveform Measurements EL Driver
Figure 4: Dual Supply Application Circuit for the SP4438
EL Lamp Noise Measurement Set-Up
1" 2" Microphone Type 4188 Bruel & Kjaer 2238 Mediator A-Weighting dBSPL Measurement Photometer Tek-J17 Aux 1 Anechoic Chamber HP8903A Audio Analyzer - SPCL 3.1, 1.17 Preamplifier with 30kHz High Pass Filter
4"
EL Lamp Differential Voltage Probe
Current Probe Tek754C Digital Osciliscope
Monitor
Voltage Waveform Measurements EL Driver
Figure 5. Electroluminescent Lamp Noise Measurement Setup for the SP4438
Rev. 11/13/00 SP4438 Ultra-Quiet Electroluminescent Lamp Driver (c) Copyright 2000 Sipex Corporation
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DESCRIPTION The SP4438 Electroluminescent Lamp Driver is a low-cost low voltage device ideal for the replacement of LED backlighting designs in cell phones, PDAs and other portable designs desiring low acoustic noise. The SP4438 contains a DC-AC inverter that can produce an AC output of 145VP-P (typical) from a +2.7V to +3.3V input voltage. An internal block diagram of the SP4438 can be found in Figure 2. The SP4438 is built on Sipex's dielectrically isolated BiCMOS process that provides the isolation required to separate the high voltage AC signal used to drive the EL lamp from the low voltage logic and signal processing circuitry. This ensures latch-up free operation in the interface between the low voltage CMOS circuitry and the high voltage bipolar circuitry. The SP4438 is ideal for applications driving EL lamps to backlight LCD displays and keypads, used in cellular radios. A total of only six external components are required for the standard operation of the SP4438: an inductor, a fast recovery diode, three capacitors and a resistor. A diagram of the SP4438 in a typical application can be found in Figure 1. Electroluminescent Technology An EL lamp is a strip of plastic that is coated with a phosphorous material which emits light (fluoresces) when a (>40V) AC signal is applied across it. Long periods of DC voltages applied to the lamp tends to breakdown the material and reduce its lifetime. With these considerations in mind, the ideal signal to drive an EL lamp is a high voltage sine wave. Traditional approaches to achieving this type of waveform included discrete circuits incorporating a transformer, transistors, and several resistors and capacitors. This approach is large and bulky, and cannot be implemented in most hand held equipment. Sipex offers low power single chip driver circuits specifically designed to drive small to medium sized electroluminescent panels. Market Applications Electroluminescent backlighting is ideal when used with LCD displays, keypads, or other backlit readouts. Its main use is to illuminate displays
Rev.11/13/00
in dim to dark conditions for momentary periods of time. EL lamps consume less power than LEDs or incandescent bulbs making them ideal for battery powered products. Also, EL lamps are able to evenly light an area without creating any undesirable "hot spots" in the display. THEORY OF OPERATION The SP4438 is a DC-AC inverter made up of: 1. The Oscillator/Frequency Divider, 2. The Coil/Boost Converter, 3. The Switched Hbridge Network, and 4. The Precision Bridge Control Logic. Further details of each element follow. The Oscillator/Frequency Divider The oscillator provides the SP4438 with an onchip clock used to control the coil switch (fCOIL) and the H-bridge network (fLAMP ). Although the oscillator frequency can be varied to optimize the lamp output, the ratio of fCOIL/fLAMP will always equal 128. Figure 2 shows the oscillator output driving the coil and through 7 flip flops, driving the lamp. The suggested oscillator frequency is 32kHz for fCOIL. The oscillator output is internally divided down by 7 flip flops to create a second internal control signal at 250Hz for fLAMP. The Coil/Boost Converter The supply VCOIL can range from +2.7V to +9V. See figure 4 on page 6. VCOILshould be chosen such that ICOIL does not exceed the maximum coil current specification. The majority of the current goes through the coil and is typically much greater than IDD. The inductor is an external component connected from VCOIL to the COIL pin of the SP4438. Energy is stored in the coil according to the equation EL = 1/2 x L x IP2 where IP, to the first approximation, is the product IP = (tON) x ((VBATT - VCE)/L) where tON is the time it takes for the coil to reach its peak current, VCE is the voltage drop across the internal NPN transistor and L is the
(c) Copyright 2000 Sipex Corporation
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
7
inductance of the coil. When the NPN transistor switch is off, the energy is forced through an internal diode which drives the switched Hbridge network. This energy recovery is directly related to the brightness of the EL lamp output. There are many variations among coils; magnetic material differences, winding differences and parasitic capacitances. The fCOIL signal controls a switch that connects the coil at the COIL pin to ground or to open circuit. The fCOIL signal is a 90% duty cycle signal switching at the oscillator frequency, 32kHz. During the time when the fCOIL signal is HIGH, the coil is connected from VCOIL to ground and a charged magnetic field is created in the coil. When the fCOIL signal is LOW, the ground connection is switched open, the field collapses, and the energy in the inductor is forced to flow toward the high voltage H-bridge switches. The Switched H-Bridge Network Current sources and precision controlled timing of the SP4438 switched H-bridge network are designed to reduce EMI emissions, extend EL lamp life, and reduce the overall power dissipation of the device. Current sources were added to the high and low side of the H-bridge network to ensure control of the charge and discharge of the EL lamp. The precision MOSFET timing of the SP4438 allows for controlled charging and discharging of the EL lamp to minimize EMI and audible noise. Refer to Figure 7 for the single ended and differential output waveforms to the EL lamp. The Precision Bridge Control Circuitry This circuitry is driven by the internal oscillator to control the timing of the charge and discharge of the EL lamp to eliminate EMI and noise concerns. This control circuitry drives the Hbridge timing. Refer to Figure 2 for the internal block diagram of the SP4438. Fine Tuning Performance Circuit performance of the SP4438 can be improved with some of the following suggestions:
Increase EL Lamp Light Output: By connecting a fast recovery diode from COIL (pin 5) to CINT (pin 6), the internal diode of the switched H-bridge network is bypassed resulting in an increase in light output at the EL lamp. We suggest a fast recovery diode, such as the industry standard 1N4148, be used for D1. This circuit connection can be found in Figure 2. Split Power Supplies: Instead of driving both the logic and power circuitry of the SP4438 from a single battery supply, two supplies can be implemented, one to drive the IC and the other to drive the inductor. The +2.7V to +3.3V power supply is connected to VCC. This power supply can be used to power the oscillator and control logic. The current draw on this power supply will be minimal, typically <1mA for SP4438. When selecting a separate +2.7V to +9.0V power supply connected to the inductor to drive the IC power circuitry, it is essential that the proper inductor is selected. The peak current draw of the inductor should not exceed maximum conditions over the entire input voltage operating range. If the inductor selected is too large, the power current may rise too slowly. At low input voltages, this will not allow the peak current to rise to the set peak current trip point. At high input voltages, the power current might rise too quickly and overshoot the set peak current trip point. These conditions will prevent optimal light output at the EL lamp. Excessive currents may permanently affect the normal operation of the SP4438. Changing the EL Lamp Output Voltage Waveform: Designers can alter the trapezoidal output voltage waveform to the EL Lamp. Changing the capacitance of the integrating capacitor, CINT, will ideally integrate the output waveform making it appear more sinusoidal. This will minimize any noise inherent to the application.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
8
Audio Noise Considerations: A system can have different sources of audio noise. The coil, the filter capacitor, and the EL lamp itself may be a source of audio noise if operated in the audio frequency range. Designers should select either the coil or coil frequency such that the coil is not in continous mode as this will greatly decrease efficiency and contribute to noise. Close attention should be given to the mounting of the filter capacitor where the mounting can act as an amplifier, such as in a speaker box. Film capacitors do not exhibit audio noise concerns but certain ceramic capacitors subjected to a high voltage source can exhibit a piezoelectric effect. This can be a source of concern in the audio range. The EL lamp itself can also exhibit audible noise as a result of high voltage swings at frequencies within the audio range. Close attention should be given to the physical mounting of the EL lamp to diminish this concern that can generate both EMI and audio noise. Electromagnetic Interference (EMI) Considerations: Electromagnetic Interferenc Electromagnetic Interference (EMI) concerns are rooted in uncontrolled high voltage swings on the EL lamp. The controlled charging and dischanging of the EL lamp by the SP4438 minimizes EMI effects. Printed Circuit Board Layout Suggestions: The SP4438's high voltage operation makes PC layout important for minimizing ground bounce and noise. Keep the IC's GND pin and the ground leads of C1 and CINT less than 0.2 in (5mm) apart. Also keep the connections to COIL as short as possible. To maximize output power and efficiency and minimize output ripple voltage, use a ground plane and solder the IC's VSS directly to the ground plane. EL Lamp Driver Design Challenges There are many variables which can be optimized for specific applications. The amount of light
emitted is a function of the voltage applied to the lamp, the frequency at which it is applied, the lamp material and the lamp size. Sipex supplies characterization charts to aid the designer in selecting the optimum circuit configuration. Sipex will perform customer application evaluations, using the customer's actual EL lamp to determine the optimum operating conditions for specific applications. For customers considering an EL backlighting solution for the first time, Sipex is able to offer retrofitted solutions to the customer's existing LED or nonbacklit product for a thorough electrical and cosmetic evaluation. Refer to Figure 6 for an enlargement and actual size evaluation board layout. Please contact your local Sales Representative for Sipex or the Sipex factory directly to initiate this valued service.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
9
EVALUATION BOARD LAYOUT (ENLARGED)
EVALUATION BOARD LAYOUT (ACTUAL SIZE)
Figure 6. Evaluation Board Layout for the SP4438.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
10
Figure 7. Single Ended and Differential Output Waveforms for the SP4438 CH.1 and CH.2 are single ended waveform SP4438 CH.4 is differential SP4438 waveform.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
11
Supply Current vs. Lamp Size
25
20
IDD (mA)
15
10
5
0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Lamp Size (in2) Figure 1
Output Voltage vs. Lamp Size
200 180 160
Output Voltage (Vp-p)
140 120 100 80 60 40 20 0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Lamp Size (in2) Figure 2
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
12
Luminance vs.Lamp Size
30 8 7 25 6
Luminance (cd/m^2)
20 5 15 4 3 10 2 5 1 0 1 1.5 2 2.5 3 0
Lamp Size (in2) Figure 3
Lamp Frequency vs. VDD
280
275
Lamp Freq-(Hz)
270
265
260
255
250 2.5 2.7 2.9 3.1 3.3 3.5 3.7
VDD (volts) Figure 4
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
13
Lamp Voltage vs. VDD
180
170
Lamp Voltage (V-p-p)
160
150
140
130
120 2.5 2.7 2.9 3.1 3.3 3.5 3.7
VDD (volts) Figure 5
27
25
23
ICC (mA)
21
19
17
15 2.5 2.7 2.9 3.1 3.3 3.5 3.7
VDD (volts) Figure 6
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
14
Luminance vs. VDD
24
22
Luminance (cd/m^2)
20
18
16
14
12
10 2.5 2.7 2.9 3.1 3.3 3.5 3.7
VDD (volts) Figure 7
300 290 280
Lamp Frequency (Hz)
270 260 250 240 230 220 210 200 -40 -20 0 20 40 60 80
Temp (C) Figure 8
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
15
Peak Lamp Voltage vs. Temp
160 155
Peak Lamp Voltage (Volts)
150 145 140 135 130 125 120 -40 -20 0 20 40 60 80
Temp (C) Figure 9
IDD (total part current) vs. Temp
25 24 23
Total Part Current
22 21 20 19 18 17 16 15 -40 -20 0 20 40 60 80
Temp (C) Figure 10
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
16
Coil Manufacturers
Hitachi Metals Material Trading Division 2101 S. Arlington Heights Road, Suite 116 Arlington Heights, IL 60005-4142 Phone: 1-800-777-8343 Ext. 12 (847) 364-7200 Ext. 12 Fax: (847) 364-7279 Hitachi Metals Ltd. Europe Immernannstrasse 14-16, 40210 Dusseldorf, Germany Contact: Gary Loos Phone: 49-211-16009-0 Fax: 49-211-16009-29 Hitachi Metals Ltd. Kishimoto Bldg. 2-1, Marunouchi 2-chome, Chiyoda-Ku, Tokyo, Japan Contact: Mr. Noboru Abe Phone: 3-3284-4936 Fax: 3-3287-1945 Hitachi Metals Ltd. Singapore 78 Shenton Way #12-01, Singapore 079120 Contact: Mr. Stan Kaiko Phone: 222-8077 Fax: 222-5232 Hitachi Metals Ltd. Hong Kong Room 1107, 11/F., West Wing, Tsim Sha. Tsui Center 66 Mody Road,Tsimshatsui East, Kowloon, Hong Kong Phone: 2724-4188 Fax: 2311-2095 Panasonic 6550 Katella Ave Cypress, CA 90630-5102 Phone: (714) 373-7366 Fax: (714) 373-7323 Sumida Electric Co., LTD. 5999, New Wilke Road, Suite #110 Rolling Meadows, IL,60008 U.S.A. Phone: (847) 956-0666 Fax: (847) 956-0702 Sumida Electric Co., LTD. 4-8, Kanamachi 2-Chrome, Katsushika-ku, Tokyo 125 Japan Phone: 03-3607-5111 Fax: 03-3607-5144 Sumida Electric Co., LTD. Block 15, 996, Bendemeer Road #04-05 to 06, Singapore 339944 Republic of Singapore Phone: 2963388 Fax: 2963390 Sumida Electric Co., LTD. 14 Floor, Eastern Center, 1065 King's Road, Quarry Bay, Hong Kong Phone: 28806688 Fax: 25659600 Murata 2200 Lake Park Drive, Smyrna Georgia 30080 U.S.A. Phone: (770) 436-1300 Fax: (770) 436-3030 Murata European Holbeinstrasse 21-23, 90441 Numberg, Postfachanschrift 90015 Phone: 011-4991166870 Fax: 011-49116687225 Murata Taiwan Electronics 225 Chung-Chin Road, Taichung, Taiwan, R.O.C. Phone: 011 88642914151 Fax: 011 88644252929 Murata Electronics Singapore 200 Yishun Ave. 7, Singapore 2776, Republic of Singapore Phone: 011 657584233 Fax: 011 657536181 Murata Hong Kong Room 709-712 Miramar Tower, 1 Kimberly Road, Tsimshatsui, Kowloon, Hong Kong Phone: 011-85223763898 Fax: 011-85223755655
Polarizers/transflector Mnfg.
Nitto Denko Yoshi Shinozuka Bayside Business Park 48500 Fremont, CA. 94538 Phone: 510 445 5400 Fax: 510 445-5480 Top Polarizer- NPF F1205DU Bottom - NPF F4225 or (F4205) P3 w/transflector Transflector Material Astra Products Mark Bogin P.O. Box 479 Baldwin, NJ 11510 Phone (516)-223-7500 Fax (516)-868-2371
Rev.11/13/00
EL Lamp manufacturers
Leading Edge Ind. Inc. 11578 Encore Circle Minnetonka, MN 55343 Phone 1-800-845-6992 Midori Mark Ltd. 1-5 Komagata 2-Chome Taita-Ku 111-0043 Japan Phone: 81-03-3848-2011 Luminescent Systems inc. (LSI) 101 Etna Road Lebanon, NH. 03766-9004 Phone: (603) 448-3444 Fax: (603) 448-3452
NEC Corporation Yumi Saskai 7-1, Shiba 5 Chome, Minato-ku, Tokyo 108-01, Japan Phone: (03) 3798-9572 Fax: (03) 3798-6134 Seiko Precision Shuzo Abe 1-1, Taihei 4-Chome, Sumida-ku, Tokyo, 139 Japan Phone: (03) 5610-7089 Fax: (03) 5610-7177 Gunze Electronics 2113 Wells Branch Parkway Austin, TX 78728 Phone: (512) 752-1299
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
17
All package dimensions in inches
0.0256 BSC 0.012 0.003 0.0965 0.003 0.118 0.004 R .003 0.16 0.003 12.0 4 0.01 1 2 12.0 4 0.008 0 - 6 0.006 0.006 0.006 0.006
0.020 0.020
0.0215 0.006 0.037 Ref
3.0 3
0.116 0.004
0.034 0.004 0.040 0.003 0.116 0.004
0.013 0.005 0.118 0.004
0.004 0.002
0.118 0.004
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
18
ORDERING INFORMATION
Model Operating Temperature Range Package Type SP4438EU .............................................. -40C to +85C .......................................... 8-Pin MSOP SP4438UEB ........................................................................................................ Evaluation Board
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
19

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