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19-2875; Rev 0; 6/03
KIT ATION EVALU BLE AVAILA
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
General Description Features
o Constant-Current Regulation for Even LED Illumination o Internal 40V MOSFET Switch Capable of Driving 10 LEDs o Small, Low-Profile External Components o 2.7V to 5.5V Input Range o Up to 88% Efficiency Driving 6 LEDs o Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V) o Analog or PWM Control of LED Intensity o Optimized for Low Input Ripple o Soft-Start to Minimize Inrush Current o 3mm x 3mm 8-Pin TDFN Package
MAX1553/MAX1554
The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 40V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs. A single analog/PWM Dual Mode input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup. The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.
Applications
Cellular Phones PDA, Palmtop, and Wireless Handhelds Color Display Backlight
PART MAX1553ETA MAX1554ETA
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 8 TDFN 3mm x 3mm 8 TDFN 3mm x 3mm
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
TOP VIEW
2.7V TO 5.5V INPUT VCC ON OFF EN LX OV WHITE LEDS
Pin Configuration
GND
VCC
1 2 3 4
8 7
LX
0V SS
PWM OR DC CONTROL
MAX1553 MAX1554
BRT SS FB GND
EN BRT
MAX1553 MAX1554
6 5
FB
TDFN 3mm x 3mm
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
ABSOLUTE MAXIMUM RATINGS
VCC, FB, OV to GND..............................................-0.3V to +6.0V LX to GND ..............................................................-0.3V to +45V EN, BRT, SS to GND...................................-0.3V to (VCC + 0.3V) ILX ...................................................................................0.9ARMS Continuous Power Dissipation (TA = +70C) 8-Pin 3mm x 3mm TDFN (derate 24.4mW/C above +70C) .............................1951mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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.
ELECTRICAL CHARACTERISTICS
(VCC = 3.3V, VOV = 0V, COUT = 1F, RSENSE = 10, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Supply Voltage Undervoltage Lockout Threshold Quiescent Current Shutdown Supply Current OV Threshold OV Input Bias Current BRT Input Resistance TIMING CONTROL Maximum On-Time On-Time Constant (K) Minimum Off-Time ERROR AMPLIFIER FB Threshold FB Input Bias Current N-CHANNEL SWITCH LX On-Resistance 0.8 1.4 VBRT = 1.25V VBRT = 3.3V VFB = 1.0V TA = +25C TA = +85C 192 203 280 15 100 200 212 mV nA VCC = 3.3V tON = K / VCC 150 2.0 3.4 6.3 250 350 4.8 s s-V ns MAX1553 MAX1554 VCC rising or falling, 35mV hysteresis typical Not switching Switching VEN = 0V Rising edge VOV = 1V TA = +25C TA = +85C 200 TA = +25C TA = +85C 1.18 CONDITIONS MIN 2.7 3.15 2.35 2.5 0.33 0.44 0.1 1 1.25 1 10 400 600 1.33 200 TYP MAX 5.5 5.50 2.65 0.65 0.9 1 UNITS V V mA A V nA k
0 < VBRT < 1.5V, EN = VCC
2
_______________________________________________________________________________________
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.3V, VOV = 0V, COUT = 1F, RSENSE = 10, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER LX Current Limit LX Leakage Current SHUTDOWN CONTROL EN Logic-Level High EN Logic-Level Low EN Input Current VEN = 0V or 5.5V TA = +25C TA = +85C 0.01 0.1 1.8 0.4 1 V V A MAX1553 MAX1554, VCC = 4.2V VLX = 38V, VEN = 0V TA = +25C TA = +85C CONDITIONS MIN 300 600 TYP 480 970 0.1 1 MAX 600 1200 5 UNITS mA A
MAX1553/MAX1554
ELECTRICAL CHARACTERISTICS
(VCC = 3.3V, VOV = 0V, COUT = 1F, RSENSE = 10, TA = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Undervoltage Lockout Threshold Quiescent Current OV Threshold BRT Input Resistance TIMING CONTROL Maximum On-Time Minimum Off-Time ERROR AMPLIFIER FB Threshold N-CHANNEL SWITCH LX On-Resistance LX Current Limit SHUTDOWN CONTROL EN Logic-Level High EN Logic-Level Low 1.8 0.4 V V MAX1553 MAX1554, VCC = 4.2V 300 600 1.4 600 1200 mA VBRT = 1.25V 192 217 mV VCC = 3.3V 2.0 150 4.8 350 s ns MAX1553 MAX1554 VCC rising or falling, 35mV hysteresis typical Not switching Switching Rising edge 0 < VBRT < 1.5V, EN = VCC 1.18 200 CONDITIONS MIN 2.7 3.15 2.35 MAX 5.5 5.50 2.65 0.65 0.9 1.33 600 UNITS V V mA V k
Note 1: Specifications to -40C are guaranteed by design, not production tested.
_______________________________________________________________________________________
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High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
Typical Operating Characteristics
(MAX1553 driving six white LEDs, VCC = VEN = 3.6V, Circuit of Figure 1, TA = +25C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT DRIVING 6 WHITE LEDS
MAX1553/54 toc01
EFFICIENCY vs. LOAD CURRENT DRIVING 6 WHITE LEDS
MAX1553/54 toc02
EFFICIENCY vs. LOAD CURRENT DRIVING 6 WHITE LEDS
VCC = 4V 90 EFFICIENCY (%) VCC = 5V
MAX1553/54 toc03
100 VCC = 5V 90 EFFICIENCY (%) VCC = 4V
100 VCC = 4V 90 EFFICIENCY (%) VCC = 5V
100
80 VCC = 3.6V
80 VCC = 3.6V VCC = 3V 70
80 VCC = 3.6V 70 VCC = 3V
70
VCC = 3V
60 L1 = 22H NO CAPACITOR ACROSS LEDs 50 0 5 10 LOAD CURRENT (mA) 15 20
60 L1 = 33H 4700pF ACROSS LEDs 50 0 5 10 LOAD CURRENT (mA) 15 20
60 L1 = 47H 4700pF ACROSS LEDs 50 0 5 10 LOAD CURRENT (mA) 15 20
EFFICIENCY vs. LOAD CURRENT WITH MAX1554 DRIVING 9 WHITE LEDS
VCC = 5V
MAX1553/54 toc04
LED CURRENT vs. INPUT VOLTAGE
MAX1553/54 toc05
LED CURRENT vs. INPUT VOLTAGE
MAX1553/54 toc06
100 VCC = 4V
26
26
90 EFFICIENCY (%)
23 LED CURRENT (mA)
L1 = 22H, NO CAPACITOR ACROSS LEDs
23 LED CURRENT (mA)
L1 = 22H, NO CAPACITOR ACROSS LEDs
80 VCC = 3.6V
20 L1 = 47H, 4700pF ACROSS LEDs L1 = 33H, 4700pF ACROSS LEDs
20 L1 = 47H, 4700pF ACROSS LEDs L1 = 33H, 4700pF ACROSS LEDs 14 R1 = 14, VBRT = 3.3V 11
70
17
17
60 CIRCUIT OF FIGURE 3 50 0 5 10 LOAD CURRENT (mA) 15 20
14 R1 = 10, VBRT = 1.25V 11 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
LED CURRENT vs. INPUT VOLTAGE WITH MAX1554 DRIVING 9 LEDS
MAX1553/54 toc07
LED CURRENT vs. BRT VOLTAGE
MAX1553/54 toc08
LED CURRENT vs. BRT DUTY CYCLE
MAX1553/54 toc09
26
35 30 LED CURRENT (mA) 25 20 15 10
30 25 LED CURRENT (mA) 20 15 10 5 0
23 LED CURRENT (mA)
20
17
14 5 CIRCUIT OF FIGURE 3 11 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) 0 0 0.6 1.2 1.8 2.4 3.0 3.6 BRT VOLTAGE (V)
0
20
40
60
80
100
BRT DUTY CYCLE (%)
4
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High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
Typical Operating Characteristics (continued)
(MAX1553 driving six white LEDs, VCC = VEN = 3.6V, Circuit of Figure 1, TA = +25C, unless otherwise noted.)
SWITCHING WAVEFORMS (CONTINUOUS OPERATION, 3.75V Li+ BATTERY, 18mA OUTPUT)
MAX1553/54 toc10
MAX1553/MAX1554
SWITCHING WAVEFORMS (DISCONTINUOUS OPERATION, 3.75V Li+ BATTERY, 10mA OUTPUT)
MAX1553/54 toc11
VLX
10V/div
VLX
10V/div
VOUT
200mV/div
VOUT
200mV/div
IL
200mA/div
IL
200mA/div
2s/div L1 = 47H, 4700pF CAPACITOR ACROSS LEDs
2s/div L1 = 47H, 4700pF CAPACITOR ACROSS LEDs
STARTUP/SHUTDOWN WAVEFORMS
MAX1553/54 toc12
BRT STEP RESPONSE
MAX1553/54 toc13
VEN
5V/div
VBRT
1V/div
VFB
200mV/div
VFB
200mV/div
VOUT
VOUT 10V/div
2V/div
40ms/div L1 = 22H
20ms/div L1 = 22H, VBRT = 0.5V TO 1.25V TO O.5V
_______________________________________________________________________________________
5
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
Pin Description
PIN 1 2 3 4 NAME GND VCC EN BRT Ground Voltage-Supply Input. 2.7V to 5.5V. The IC is powered from VCC. Enable Input. Drive high or connect to VCC to enable the IC. Drive EN low for shutdown. Brightness-Control Input. Either an analog or PWM control signal can be used. The LED current can be controlled over a 10 to 1 range. The PWM signal must be between 100Hz and 10kHz, and must have an amplitude greater than 1.72V. Feedback Input. Connect to the cathode of the LED string and connect a resistor from FB to GND to set the LED current. Soft-Start Timing-Control Input. Connect a capacitor from SS to GND to control soft-start timing. See the SoftStart section for information on selecting the soft-start capacitor. SS is pulled to ground with an internal 200 switch when EN is low. Overvoltage Sense. Connect to a resistor-divider from the anode of the LED string to set the overvoltage threshold. See Figures 1, 2, and 3. Inductor Connection. Connect to the inductor and diode. LX is high impedance when EN is low. Exposed Pad. Connect to GND. FUNCTION
5
FB
6
SS
7 8 --
OV LX EP
Detailed Description
Control Scheme
The MAX1553/MAX1554 utilize a minimum off-time, current-limited control scheme. If the voltage at FB drops below the regulation threshold, the internal low-side MOSFET turns on and the inductor current ramps up to the current limit. Once the current-limit comparator trips, the low-side MOSFET turns off for the minimum off-time (250ns). After 250ns, if the voltage at FB is above the regulation threshold, the low-side MOSFET stays off. If the voltage at FB is below the regulation point, the low-side MOSFET turns back on and the cycle repeats. By using a regulation control scheme that is not fixed frequency and that can skip pulses, the MAX1553/MAX1554 operate with very high efficiency.
Shutdown
The MAX1553/MAX1554 feature a low-current shutdown feature. When EN is low, the IC turns off, reducing its supply current to approximately 0.1A. For normal operation, drive EN high or connect to VCC.
Overvoltage Protection
The MAX1553/MAX1554 have an adjustable overvoltageprotection circuit. When the voltage at OV reaches the overvoltage threshold (1.25V typ), the protection circuitry prevents the internal MOSFET from switching, allowing the output voltage to decay. The peak output voltage in an overvoltage-protection event is set with a resistor-divider from the output connected to OV (R2 and R3 in Figures 1, 2, and 3). Select a value for R3 (10k is recommended), then solve for R2 using the following equation: V R2 = R3 x OUT(PEAK) - 1 VOV where VOV is the overvoltage threshold (1.25V typ), and VOUT(PEAK) is the desired peak output voltage.
Soft-Start
Soft-start is provided on the MAX1553/MAX1554 to minimize inrush current. The soft-start time is set with an external capacitor, C3 (Figures 1, 2, and 3). Use the following equation to solve for C3: C3 =
tSS
2 x 105
where tSS is the soft-start time. A value of 0.1F provides a soft-start time of 20ms.
6
_______________________________________________________________________________________
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
Functional Diagram
VCC LX
EN
ENABLE CONTROL CIRCUITRY
CONTROL LOGIC
DRIVER
CURRENT LIMIT
GND
UVLO
VLIM
REF
1.25V BANDGAP REFERENCE
MINIMUM tOFF ONE-SHOT MINIMUM tON ONE-SHOT
BIAS GENERATOR
ERROR COMPARATOR
FB
OV
OV COMPARATOR 128k BRT 206k SS
REF
MAX1553 MAX1554
67k
1.72V
2.7V TO 5.5V INPUT C1 4.7F ON OFF
L1 47H TOKO A920CY-470M
D1 CMDSH2-3 C2 0.47F 25V
VCC EN
LX OV
R2 200k C4 4700pF R3 10k
2.7V TO 5.5V INPUT C1 10F ON OFF
L1 4.7H MURATA LQH32C
D1 CMDSH1-60M C2 0.47F 50V
VCC EN
LX OV
R2 330k C4 3300pF R3 10k D2-D10 WHITE LEDs
MAX1553
PWM OR DC CONTROL C3 0.1F
D2-D7 WHITE LEDs PWM OR DC CONTROL
MAX1553
BRT SS
FB GND R1 10
BRT C3 0.1F SS
FB GND R1 10
Figure 1. Circuit with the MAX1553 Driving Six White LEDs
Figure 2. Circuit with the MAX1553 Driving Nine White LEDs at Up to 15mA
_______________________________________________________________________________________
7
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
Adjusting the LED Current
Adjusting the output current changes the brightness of the LEDs. The LED current is set by the voltage at BRT (VBRT) and the sense resistor (R1) at FB. The VBRT range for adjusting output current is 0 to 1.25V. Over this range, the LED current is found from the following equation: ILED = VBRT + 0.17 6.67 x R1
3.15V TO 5.5V INPUT C1 10F ON OFF L1 22H A915BY-220M D1 CMDSH1-60M C2 0.47F 50V
VCC EN
LX OV
R2 330k C4 3300pF R3 10k D2-D11 WHITE LEDs
MAX1554
PWM OR DC CONTROL C3 0.1F
BRT SS
FB GND R1 10
BRT can be overdriven; however, applying a V BRT greater than 1.72V does not increase the output current above the level at 1.72V. See the LED Current vs. BRT Voltage graph in the Typical Operating Characteristics section. To set the maximum LED current, calculate R1 when VBRT is at its maximum, as follows: R1 = VBRT(MAX) + 0.17 6.67 x ILED(MAX)
Figure 3. Circuit with the MAX1554 Driving 10 White LEDs
Inductor Selection
The MAX1553 has a 480mA inductor current limit and can drive up to six LEDs at 20mA or nine LEDs at 15mA. Inductor values from 4.7H to 47H work satisfactorily. Larger values provide the best efficiency while small inductor values allow the smallest inductor size. A good choice for best efficiency is the TOKO D62 or D62L series at 47H. For smallest size, the Murata LQH32C at 4.7H works well. The MAX1554 has a 970mA inductor current limit and can drive up to 10 LEDs at 20mA. Inductor values from 4.7H to 22H work satisfactorily. A good choice for high efficiency and small size when driving 9 or 10 LEDs is the TOKO D62 series at 22H. When large inductor values are used to optimize efficiency, the MAX1553/MAX1554 operate with continuous inductor current. With large inductor values (typically greater than 10H), stability, input, and output ripple are improved by connecting a capacitor in parallel with the LEDs (C4 in Figures 1, 2, and 3). To prevent saturation, use an inductor with a current rating that matches the device's LX current limit. However, if size is particularly important, it is sometimes acceptable to operate the inductor 10% into saturation. For best efficiency, the inductor's DC resistance should also be as low as possible.
where VBRT(MAX) is 1.72V if BRT is connected to any value greater than 1.72V, such as V CC . Otherwise, VBRT(MAX) is the maximum applied BRT control voltage. Power dissipation in R1 is typically less than 5mW; therefore, power dissipation in a standard chip resistor is not a concern.
PWM Dimming Control
The BRT input is also used as a digital input allowing LED brightness control with a logic-level PWM signal applied directly to BRT. The frequency range is from 100Hz to 10kHz, and the duty cycle range is 0 to 100%. A 0% duty cycle corresponds to the minimum current, and a 100% duty cycle corresponds to full current. See the LED Current vs. BRT Duty Cycle graph in the Typical Operating Characteristics section. The BRT resistor and SS capacitor form a lowpass filter, so PWM dimming results in DC current to the LEDs without the need for additional RC filters.
Capacitor Selection
A 0.47F ceramic output capacitor (C2) is recommended for most applications. For circuits driving six or fewer LEDs, use a 4.7F ceramic input capacitor (C1). For circuits driving more than six LEDs, use a 10F input capacitor (C1). For best stability over a wide temperature range, use capacitors with an X5R, X7R, or better dielectric.
Diode Selection
The MAX1553/MAX1554s' high switching frequency demands a high-speed rectification diode (D1) for optimum efficiency. A Schottky diode is recommended due to its fast recovery time and low forward-voltage drop.
8
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High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
Table 1. Component Suppliers
SUPPLIER Central Semiconductor Kamaya Murata Nichia Panasonic Sumida Taiyo Yuden TDK TOKO PHONE 631-435-1110 260-489-1533 814-237-1431 248-352-6575 714-373-7939 847-956-0666 408-573-4150 847-803-6100 847-297-0070 WEBSITE www.centralsemi.com www.kamaya.com www.murata.com www.nichia.com www.panasonic.com www.sumida.com www.t-yuden.com www.component.tdk.com www.toko.com
C3 0.1F BATTERY INPUT C1 4.7F L1 3.3V LOGIC C4 0.1F ON OFF D1 C2 0.47F
MAX1553/MAX1554
VCC
LX
R2
EN
OV R3
WHITE LEDs
MAX1553 MAX1554
BRT SS FB GND R1
Ensure the diode's average and peak current ratings exceed the average output current and peak inductor current. In addition, the diode's reverse breakdown voltage must exceed VOUT.
Figure 4. The MAX1553/MAX1554 can drive LEDs from battery voltages that are lower than the device operating voltage range by powering VCC from a logic supply and connecting the boost inductor to the battery.
Applications Information
Low Input-Voltage Applications
The MAX1553/MAX1554 have minimum input voltages of 2.7V (MAX1553) and 3.15V (MAX1554). However, lower battery voltages can still be boosted for LED drive as long as V CC remains within the operating range. Since most systems have a 3.3V system supply active when the display is active and backlit, that logic supply can be used to supply VCC, while the battery power connects directly to the boost inductor. No battery current is drawn when EN is low (Figure 4).
When laying out a board, minimize trace lengths between the IC and the inductor, diode, input capacitor, output capacitor, and R1. Keep traces short, direct, and wide. Keep noisy traces, such as the LX node trace, away from FB. Place the VCC bypass capacitor (C1) as close to the IC as possible. The ground connections of C1 and C2 should be as close together as possible. Star connect the grounds for R1, R3, C3, and the BRT voltage supply as close to the IC as possible. The traces from VCC to C1, from C2 to the LEDs, and from the LEDs to R1 can be longer if required.
PC Board Layout
Due to fast-switching waveforms and high-current paths, careful PC board layout is required. An evaluation kit (MAX1553EVKIT) is available as an example of a proper layout. TRANSISTOR COUNT: 740 PROCESS: BiCMOS
Chip Information
_______________________________________________________________________________________
9
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages. 6, 8, &10L, QFN THIN.EPS
1 2
L D A A2
PIN 1 ID
D2
1
N
1
b
PIN 1 INDEX AREA
C0.35 [(N/2)-1] x e REF. e
E
DETAIL A
E2
A1
k
C L
C L
L e A e
L
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
APPROVAL DOCUMENT CONTROL NO. REV.
21-0137
D
10
______________________________________________________________________________________
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
MAX1553/MAX1554
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T833-1 T1033-1 N 6 8 10 D2 1.50-0.10 1.50-0.10 1.50-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.65 BSC 0.50 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEED-3 b 0.40-0.05 0.30-0.05 0.25-0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 2.00 REF
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL DOCUMENT CONTROL NO. REV.
2 2
21-0137
D
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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