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19-3664; Rev 0; 4/05
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN
General Description
The MAX1589A low-dropout linear regulator operates from a +1.62V to +3.6V supply and delivers a guaranteed 500mA continuous load current with a low 175mV dropout. The high-accuracy (0.5%) output voltage is preset to internally trimmed voltages from +0.75V to +3.0V. An active-low, open-drain reset output remains asserted for at least 70ms after the output voltage reaches regulation. This device is offered in 6-pin thin SOT23 and 6-pin, 3mm x 3mm thin DFN packages. An internal pMOS pass transistor maintains low supply current, independent of load and dropout voltage, making the MAX1589A ideal for portable battery-powered equipment such as personal digital assistants (PDAs), digital still cameras, cell phones, cordless phones, and notebook computers. Other features include logic-controlled shutdown, short-circuit protection, and thermal-overload protection. o o o o o o o o o o o
Features
Low 1.62V Minimum Input Voltage Guaranteed 500mA Output Current 0.5% Initial Accuracy Low 175mV Dropout at 500mA Load 70ms RESET Output Flag Supply Current Independent of Load and Dropout Voltage Logic-Controlled Shutdown Thermal-Overload and Short-Circuit Protection Preset Output Voltages (0.75V, 1.0V, 1.3V, 1.5V, 1.8V, 2.5V, and 3.0V) Tiny 6-Pin Thin SOT23 Package (<1.1mm High) Thin 6-Pin TDFN Package (<0.8mm High)
MAX1589A
Ordering Information
PART* MAX1589AEZT_ _ _+T MAX1589AETT_ _ _ + TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 6 Thin SOT23-6 6 TDFN
Applications
Notebook Computers Cellular and PCS Phones Personal Digital Assistants (PDAs) Handheld Computers Digital Still Cameras PCMCIA Cards CD and MP3 Players
*Insert the desired three-digit suffix (see the Selector Guide) into the blanks to complete the part number. Contact the factory for other output voltages. +Denotes lead-free packaging.
Selector Guide
VOUT (V) 0.75 1.00 1.30 1.50 1.80 2.50 3.00 SUFFIX 075 100 130 150 180 250 300 MAX1589A TOP MARK SOT AACC AACD AACE AACF AACG AACH AACI TDFN ALG ALH ALI ALJ ALK ALF ALL
Typical Operating Circuit
INPUT 1.62V TO 3.6V CIN 1F IN OUT OUTPUT 500mA 0.75V TO 3.0V COUT 4.7F
TOP VIEW
Pin Configurations
SHDN
IN
6
IN 1 6 OUT
5
4
MAX1589A
ON SHDN OFF RESET
LOGIC SUPPLY 100k TO C
SHDN 3 4 RESET MAX1589A GND 2 5 I.C.
MAX1589A
1
OUT
2
I.C.
GND
THIN SOT23
TDFN 3mm x 3mm
________________________________________________________________ Maxim Integrated Products
RESET
GND
3
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.
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RESET to GND .....................................-0.3V to +4.0V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 6-Pin Thin SOT23 (derate 9.1mW/C above +70C) ....727mW 6-Pin 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
(VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1F, COUT = 4.7F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Voltage Input Undervoltage Lockout Output Voltage Accuracy Maximum Output Current Current Limit Ground Current Dropout Voltage Load Regulation Line Regulation Output Noise PSRR SHUTDOWN Shutdown Supply Current SHDN Input Logic Levels SHDN Input Bias Current Turn-On Delay RESET OUTPUT Reset Threshold Accuracy RESET Output Low Voltage VOL VOUT falling (1.7% typical hysteresis) I RESET = 100A VIN = +1.0V, I RESET = 100A 80 82.5 1.5 3 85 100 100 %VOUT mV IOFF VIH VIL I SHDN SHDN = GND VIN = 1.62V to 3.6V VIN = 1.62V to 3.6V V SHDN = 0V or 3.6V TA = +25C TA = +85C 1 5 90 TA = +25C TA = +85C 1.4 0.6 300 0.001 0.01 1 A V nA s IOUT ILIM IQ VIN - VOUT VLDR VLNR SYMBOL VIN VUVLO VIN rising (180mV typical hysteresis) IOUT = 150mA, TA = +25C IOUT = 1mA to 500mA, VIN = (VOUT + 0.5V) to +3.6V Continuous VOUT = 96% of nominal value No load IOUT = 500mA Dropout (Note 2) IOUT = 500mA, VOUT 1.8V (Note 2) IOUT = 1mA to 500mA VIN = (VOUT + 0.5V) to +3.6V, IOUT = 100mA 10Hz to 100kHz, IOUT = 10mA f < 1kHz, IOUT = 10mA -0.15 CONDITIONS MIN 1.62 1.30 -0.5 -1.5 500 550 850 70 90 70 175 0.02 +0.01 86 70 350 0.5 +0.15 mV % %/V VRMS dB 1150 140 A TYP MAX 3.60 1.60 +0.5 +1.5 % mARMS mA UNITS V V
From SHDN high to OUT high, VOUT = 1.5V
2
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Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1F, COUT = 4.7F, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER RESET Output High Leakage Current Reset Delay THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis T SHDN T SHDN +165 15 C C SYMBOL IOH tRP CONDITIONS V RESET = 3.6V, RESET not asserted TA = +25C TA = +85C 70 MIN TYP 0.001 0.01 100 160 MAX 1 UNITS A ms
MAX1589A
From VOUT high to RESET rising
Note 1: Limits are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design. Note 2: The dropout voltage is defined as VIN - VOUT, when VOUT is 4% lower than the value of VOUT when VIN = VOUT + 0.5V.
Typical Operating Characteristics
(VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1F, COUT = 4.7F, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT
MAX1589A toc01
OUTPUT VOLTAGE ACCURACY vs. INPUT VOLTAGE
MAX1589A toc02
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
VOUT = +1.5V OUTPUT VOLTAGE ACCURACY (%) 1.0 0.5 IOUT = 0mA, 100mA, 500mA 0 -0.5 -1.0 -1.5
MAX1589A toc03
0.2 OUTPUT VOLTAGE ACCURACY (%)
0.50 VOUT = +1.5V OUTPUT VOLTAGE ACCURACY (%) 0.25 IOUT = 0mA 0 IOUT = 100mA -0.25 IOUT = 500mA
1.5
0.1 VOUT = +1.5V 0 VOUT = +3.0V -0.1 VOUT = +0.75V -0.2 0 100 200 300 400 500 LOAD CURRENT (mA)
-0.50 1.4 1.8 2.2 2.6 3.0 3.4 INPUT VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (C)
GROUND-PIN CURRENT vs. LOAD CURRENT
MAX1589A toc04
GROUND-PIN CURRENT vs. INPUT VOLTAGE
MAX1589A toc05
GROUND-PIN CURRENT vs. TEMPERATURE
VOUT = +1.5V GROUND-PIN CURRENT (A) 90 IOUT = 1mA TO 500mA 80
MAX1589A toc06
120 110 100 VOUT = +1.5V 90 VOUT = +0.75V 80 70 60 0.01 0.1 1 10 100 VOUT = +3.0V
120 IOUT = 100mA GROUND-PIN CURRENT (A) 100 80 60 40 20 VOUT = +1.5V 0 IOUT = 0mA IOUT = 500mA
100
GROUND-PIN CURRENT (A)
70 IOUT = 0mA 60
50 1.2 1.6 2.0 2.4 2.8 3.2 3.6 -40 -15 10 35 60 85 INPUT VOLTAGE (V) TEMPERATURE (C)
1000
LOAD CURRENT (mA)
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3
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
Typical Operating Characteristics (continued)
(VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1F, COUT = 4.7F, TA = +25C, unless otherwise noted.)
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX1589A toc07
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
VOUT = +1.5V VOUT = +0.75V VOUT = +3.0V PSRR (dB) 70 60
MAX1589A toc08
200
80
160 VDROPOUT (mV)
120
VOUT = +1.8V VOUT = +3.0V
50 40 30 20 10 IOUT = 10mA 0.1 1 10 FREQUENCY (kHz) 100 1000
80
40
0 0 100 200 300 400 500 LOAD CURRENT (mA)
0
LINE-TRANSIENT RESPONSE
MAX1589A toc09
LINE-TRANSIENT RESPONSE NEAR DROPOUT
MAX1589A toc10
4V VIN 3.5V 500mV/div
2.5V VIN 1.8V 500mV/div
VOUT ILOAD = 100mA VOUT = 1.5V 40s/div
1.5V 10mV/div AC-COUPLED
VOUT ILOAD = 100mA VOUT = 1.5V 40s/div
1.5V 10mV/div AC-COUPLED
LOAD-TRANSIENT RESPONSE
MAX1589A toc11
LOAD-TRANSIENT RESPONSE
MAX1589A toc12
200mA IOUT 20mA
200mA/div
500mA IOUT 100mA
500mA/div
VOUT 0
20mV/div AC-COUPLED
VOUT
50mV/div AC-COUPLED
VIN = 1.8V VOUT = 1.5V
20s/div
VIN = 3.6V VOUT = 1.5V
20s/div
4
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Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
Typical Operating Characteristics (continued)
(VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1F, COUT = 4.7F, TA = +25C, unless otherwise noted.)
SHUTDOWN RESPONSE
MAX1589A toc13
SHUTDOWN/RESET RESPONSE
MAX1589A toc14
RL = 25 VOUT = 1.5V VSHDN 0 VOUT VOUT 500mV/div 0 100s/div VRESET 0 40ms/div 0 1V/div VSHDN 0
RL = 25 VOUT = 1.5V 1V/div
1V/div
1V/div
LINE/RESET RESPONSE
MAX1589A toc15
RL = 25 VOUT = 1.5V VIN 0 VOUT 0 VRESET 0 200ms/div 1V/div 1V/div 2V/div
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5
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
Pin Description
PIN NAME SOT23 1 TDFN 6 IN Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a 1F ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). Ground. GND also functions as a heatsink. Solder GND to a large pad or circuit-board ground plane to maximize SOT23 power dissipation. Ground Active-Low Shutdown Input. A logic-low reduces supply current to below 1A. Connect to IN or logic-high for normal operation. Active-Low, Open-Drain Reset Output. RESET rises 100ms after the output has achieved regulation. RESET falls immediately if VOUT drops below 82.5% of its nominal voltage, or if the MAX1589A is shut down. Internally Connected. Leave floating or connect to GND. Regulator Output. Sources up to 500mA. Bypass with a 4.7F low-ESR ceramic capacitor to GND. Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground plane to maximize TDFN power dissipation. FUNCTION
2 -- 3
-- 4 5
GND GND SHDN
4 5 6 --
3 2 1 Exposed Pad
RESET I.C. OUT EP
Detailed Description
The MAX1589A is a low-dropout, low-quiescent-current, high-accuracy linear regulator designed primarily for battery-powered applications. The device supplies loads up to 500mA and is available with preset output voltages from +0.75V to +3.0V. As illustrated in Figure 1, the MAX1589A contains a reference, an error amplifier, a p-channel pass transistor, an internal feedback voltage-divider, and a power-good comparator. The error amplifier compares the reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is too high, the passtransistor gate is pulled up, allowing less current to pass to the output.
MAX1589A does not suffer from these problems and consumes only 90A (typ) of quiescent current under heavy loads, as well as in dropout.
Shutdown
Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input, an internal 1.5k resistor pulls OUT to GND, RESET is actively pulled low, and supply current drops below 1A.
RESET Output
The MAX1589A's microprocessor (P) supervisory circuitry asserts a guaranteed logic-low reset during power-up, power-down, and brownout conditions down to +1V. RESET asserts when VOUT is below the reset threshold and remains asserted for at least 70ms (tRP) after VOUT rises above the reset threshold.
Current Limit
The MAX1589A monitors and controls the pass transistor's gate voltage, limiting the output current to 850mA (typ). If the output current exceeds ILIM, the MAX1589A output voltage drops.
Internal p-Channel Pass Transistor
The MAX1589A features a 0.33 (RDS(ON)) p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current. pnpbased regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. The
6
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX1589A. When the junction temperature exceeds +165C, a thermal sensor turns off the pass
_______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
IN SHDN
SHUTDOWN LOGIC
ERROR AMP
MOS DRIVER WITH ILIMIT
P OUT
MAX1589A
POWER-GOOD COMPARATOR THERMAL SENSOR REF 82.5% REF
RESET
100ms TIMER
GND
Figure 1. Functional Diagram
transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 15C, resulting in a pulsed output during continuous thermal-overload conditions. Thermaloverload protection safeguards the MAX1589A in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of +150C.
41C/W for the 3mm x 3mm TDFN package, and 110C/W for the 6-pin thin SOT23 package. For best heatsinking, expand the copper connected to GND, or the exposed paddle. The MAX1589A delivers up to 500mA and operates with an input voltage up to +3.6V. However, when using the 6-pin SOT23 version, high output currents can only be sustained when the input-output differential voltage is low, as shown in Figure 2. The maximum allowed power dissipation for the 6-pin TDFN is 1.951W at TA = +70C. Figure 3 shows that the maximum input-output differential voltage is not limited by the TDFN package power rating.
Operating Region and Power Dissipation
The MAX1589A's maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipated in the device is P = IOUT (VIN VOUT). The maximum allowed power dissipation is: PMAX = (TJ(MAX) - TA) / (JC + CA) where TJ(MAX) - TA is the temperature difference between the MAX1589A die junction and the surrounding air, JC is the thermal resistance of the junction to the case, and CA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. Typical thermal resistance (JC + JA) for a device mounted to a 1in square, 1oz copper pad is
Applications Information
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX1589A's input and output for stable operation over the full temperature range and with load currents up to 500mA. Connect a 1F ceramic capacitor between IN and GND and a 4.7F low-ESR ceramic capacitor between OUT and GND. The input capacitor (C IN ) lowers the source impedance of the input supply. Use larger output
7
_______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT)
MAX1589A fig02
MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT)
TA = +85C
MAX1589A fig03
600 MAXIMUM OUTPUT CURRENT (mA) 500 400 300 200 100 0 0 0.5 1.0 1.5 2.0
MAXIMUM OUTPUT CURRENT (mA)
TA = +85C TA = +70C
600 500 400 300 200 100 0
MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN SOT23 2.5 3.0
MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN TDFN 0 0.5 1.0 1.5 2.0 2.5 3.0
(VIN - VOUT) (V)
(VIN - VOUT) (V)
Figure 2. Power Operating Regions for 6-Pin SOT23: Maximum Output Current vs. Input Voltage
Figure 3. Power Operating Region for 6-Pin TDFN: Maximum Output Current vs. Input Voltage
capacitors to reduce noise and improve load-transient response, stability, and power-supply rejection. The output capacitor's equivalent series resistance (ESR) affects stability and output noise. Use output capacitors with an ESR of 30m or less to ensure stability and optimize transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 10F. Connect CIN and COUT as close to the MAX1589A as possible to minimize the impact of PC board trace inductance.
nents of the output response: a near-zero DC shift from the output impedance due to the load-current change, and the transient response. A typical transient response for a step change in the load current from 100mA to 500mA is 35mV. Increasing the output capacitor's value and decreasing the ESR attenuates the overshoot.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage difference (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1589A uses a p-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (RDS(ON) = 0.33) multiplied by the load current (see the Typical Operating Characteristics): VDROPOUT = VIN - VOUT = 0.33 IOUT The MAX1589A ground current reduces to 70A in dropout.
Noise, PSRR, and Transient Response
The MAX1589A is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems, while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. Frequency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The MAX1589A load-transient response (see the Typical Operating Characteristics) shows two compo-
Chip Information
TRANSISTOR COUNT: 2556 PROCESS: BiCMOS
8
_______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN
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.)
MAX1589A
_______________________________________________________________________________________
9
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
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.)
10
______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
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.) 6, 8, &10L, DFN THIN.EPS
2
D2 D A2
N
PIN 1 ID
0.35x0.35 b
PIN 1 INDEX AREA
E DETAIL A
E2 e
[(N/2)-1] x e REF.
A1
k
C L
C L
A
L e e
L
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
1
______________________________________________________________________________________
11
Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589A
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.)
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 MAX. 0.80 3.10 3.10 0.05
0.20 0.40 0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1433-1 T1433-2 N 6 6 8 8 8 10 14 14 D2 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.70-0.10 1.70-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 ------b 0.40-0.05 0.40-0.05 0.30-0.05 0.30-0.05 0.30-0.05 0.25-0.05 0.20-0.05 0.20-0.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.40 REF 2.40 REF
DOWNBONDS ALLOWED
NO NO NO NO YES NO YES NO
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
2 2
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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