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19-2837; Rev 0; 4/03
KIT ATION EVALU BLE AVAILA
800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
General Description Features
o o o o o o o o o o o o o o o Up to 97% Efficiency 2MHz PWM Switching 800mA Guaranteed Output Current Low 48A Quiescent Current Power-Saving Modes: Pulse-Group, Pulse-Skip, Forced-PWM Mode 0.75V to 2.5V Preset Output Range (in 50mV Increments) Voltage-Positioning Load Transients 5mVP-P Output Ripple Tiny 2.2H Inductor 10F Ceramic Output Capacitor Low 0.1A Shutdown Current No External Schottky Diode Required Soft-Start with Zero Inrush Current 170ms (min) RESET Output Small 12-Pin, 4mm x 4mm Thin QFN Package
MAX1572
The MAX1572 is a fixed-frequency, synchronous stepdown DC-to-DC converter to power low-voltage microprocessor/DSP cores in portable equipment requiring high efficiency in a limited PC board area. The features are optimized for high efficiency over a wide load range, small external component size, low output ripple, and excellent transient response. The input supply voltage range is from 2.6V to 5.5V, while the output is internally fixed from 0.75V to 2.5V in 50mV increments with a guaranteed output current of 800mA. The high 2MHz switching allows tiny low-cost capacitors and a low-profile inductor, while the power-saving pulse-group mode reduces quiescent current to 48A (typ) with light loads. To reduce noise and RF interference, the converter can be configured to provide forced-PWM operation. The MAX1572 includes a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. Other features include softstart to eliminate inrush current at startup and a 170ms (min) RESET output to provide power-on/undervoltage reset. The MAX1572 is available in a 12-pin, 4mm x 4mm thin QFN package with exposed paddle.
Ordering Information
PART TEMP RANGE PIN-PACKAGE MAX1572ETC075 -40C to +85C 12 Thin QFN-EP** MAX1572ETC130 -40C to +85C 12 Thin QFN-EP** MAX1572ETC150 -40C to +85C 12 Thin QFN-EP** MAX1572ETC180 -40C to +85C 12 Thin QFN-EP** MAX1572ETC250 -40C to +85C 12 Thin QFN-EP** MAX1572ETCxyz* -40C to +85C 12 Thin QFN-EP** *xyz is for the output voltage (e.g., MAX1572ETC165 has a 1.65V output). Minimum order quantity is 2500. **EP = Exposed paddle.
Applications
Cell Phones and Smart Phones PDAs, Palmtops, and Notebook Computers MP3 and DVD Players Digital Cameras and Camcorders PCMCIA Cards Hand-Held Instruments
Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT 2.6V TO 5.5V BATT LX 2.2H OUTPUT 0.75V TO 2.5V 800mA
Pin Configuration
LX 8
TOP VIEW
9 EN1 10 11 12 1 RESET
PGND 7 6 EN2
GND
MAX1572
ABATT PGND
GND
BATT
MAX1572
5 4
ABATT
MODE SELECT EN1 EN2 SS GND OUT RESET
OUT
2 SS
3 GND
4mm x 4mm THIN QFN
________________________________________________________________ Maxim Integrated Products
1
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET MAX1572
ABSOLUTE MAXIMUM RATINGS
ABATT, BATT, EN1, EN2, RESET, OUT, SS to GND ............................................................-0.3V to +6V PGND to GND .......................................................-0.3V to +0.3V LX Current (Note 1) .............................................................2.1A Output Short-Circuit Duration ............................................Infinite Continuous Power Dissipation (TA = +70C) 12-Pin Thin QFN (derate 16.9mW/C above +70C)...1349mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: LX has internal clamp diodes to PGND and BATT. Applications that forward bias these diodes should take care not to exceed the IC's package power dissipation limits.
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
(VBATT = 3.6V, TA = +0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER BATT Input Voltage Undervoltage Lockout Threshold Quiescent Supply Current Shutdown Supply Current Maximum Output Current OUT Bias Current No load, EN1 = EN2 = BATT 100mA load Output-Voltage Accuracy (Voltage Positioning) 300mA load 550mA load 800mA load Line Regulation P-Channel On-Resistance N-Channel On-Resistance P-Channel Current-Limit Threshold N-Channel Current-Limit Threshold N-Channel Zero-Crossing Threshold LX Output Current LX Leakage Current Maximum Duty Cycle Minimum Duty Cycle Switching Frequency SS Output Impedance EN1 = BATT, EN2 = GND or EN1 = GND, EN2 = BATT EN1 = EN2 = BATT 1.8 65 EN1 = EN2 = BATT EN1 = BATT, EN2 = GND (Note 2) EN1 = EN2 = GND 100 0 16.7 2 100 17.3 2.2 150 MHz k 0.1 ILX = 180mA ILX = 180mA VBATT = 3.6V VBATT = 2.6V VBATT = 3.6V VBATT = 2.6V 1.00 -0.68 15 -0.4 VBATT rising and falling, 1% hysteresis EN1 = GND, EN2 = BATT, no switching EN1 = BATT, EN2 = GND, no switching EN1 = EN2 = GND, TA = +25C 800 6 1.2 +0.8 0 -1 -2 0.3 0.28 0.33 0.18 0.20 1.25 -0.52 40 1.65 -0.37 65 1.4 10 0.30 0.45 %/V A A mA ARMS A % % 9 3.2 +2.0 % CONDITIONS MIN 2.6 2.20 2.35 48 700 0.1 1 TYP MAX 5.5 2.55 80 UNITS V V A A mA A
2
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 3.6V, TA = +0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER SS Discharge Resistance EN_ Logic Input High EN_ Logic Input Low EN_ Logic Input Current RESET Threshold RESET Timer Delay Time RESET Output Low Level RESET Internal Pullup Resistance to OUT Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis TJ rising Percent of nominal, measured at OUT From VOUT > 90% to RESET = HI ISINK = 1mA 9 87 170 0.1 90 200 0.015 14 160 20 CONDITIONS EN1 = EN2 = GND VABATT > 4.2V VABATT 4.2V 1.6 1.4 0.4 1 93 230 0.075 20 MIN TYP 100 MAX 200 UNITS V V A % ms V k C C
MAX1572
ELECTRICAL CHARACTERISTICS
(VBATT = 3.6V, TA = -40C to +85C, unless otherwise noted.) (Note 3)
PARAMETER BATT Input Voltage Undervoltage Lockout Threshold Quiescent Supply Current Shutdown Supply Current Maximum Output Current OUT Bias Current Output-Voltage Accuracy (Voltage Positioning) P-Channel On-Resistance N-Channel On-Resistance N-Channel Current-Limit Threshold N-Channel Zero-Crossing Threshold LX Output Current LX Leakage Current Maximum Duty Cycle Minimum Duty Cycle Switching Frequency SS Output Impedance SS Discharge Resistance EN_ Logic Input High EN1 = EN2 = GND VABATT > 4.2V VABATT 4.2V 1.6 1.4 EN1 = EN2 = BATT 1.8 65 No load, EN1 = EN2 = BATT 100mA load ILX = 180mA ILX = 180mA EN1 = EN2 = BATT EN1 = BATT, EN2 = GND (Note 2) EN1 = EN2 = GND 100 17.3 2.2 150 200 -0.68 10 -1.2 VBATT rising and falling, 1% hysteresis EN1 = GND, EN2 = BATT, no switching EN1 = EN2 = GND 800 9 3.2 +2.8 0.45 0.3 -0.22 65 1.4 10 CONDITIONS MIN 2.6 2.20 TYP MAX 5.5 2.55 80 3 UNITS V V A A mA A % A mA ARMS A % % MHz k V
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET MAX1572
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 3.6V, TA = -40C to +85C, unless otherwise noted.) (Note 2)
PARAMETER EN_ Logic Input Low EN_ Logic Input Current RESET Threshold RESET Timer Delay Time RESET Output Low Level RESET Internal Pullup Resistance to OUT Percent of nominal, measured at OUT From VOUT > 90% to RESET = HI ISINK = 1mA 9 87 170 CONDITIONS MIN TYP MAX 0.4 1 93 230 0.2 20 UNITS V A % ms V k
Note 2: Guaranteed by design, not production tested. Note 3: Specifications to -40C are guaranteed by design and not production tested.
Typical Operating Characteristics
(VBATT = 3.6V, VOUT = 1.5V, EN1 = GND, EN2 = BATT, TA = +25C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT WITH 2.5V OUTPUT
MAX1572toc01
EFFICIENCY vs. LOAD CURRENT WITH 1.8V OUTPUT
MAX1572toc02
EFFICIENCY vs. LOAD CURRENT WITH 1.5V OUTPUT
MAX1572toc03
100 90 EFFICIENCY (%) 80 70 60 50 40 1 10 100
100 90 EFFICIENCY (%) 80 70 60 50 40 VIN = 2.6V VIN = 3.6V VIN = 5V
100 90 EFFICIENCY (%) 80 70 60 50 40 VIN = 2.6V VIN = 3.6V VIN = 5V
VIN = 2.6V
VIN = 3.6V
VIN = 5V
1000
1
10
100
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT vs. MODE
PULSEGROUP MODE
MAX1572toc04
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1572toc05
OUTPUT VOLTAGE vs. INPUT VOLTAGE WITH 100mA LOAD
MAX1572toc06
100 90 EFFICIENCY (%) 80 70 60 50 40 1 10 100 PULSESKIP MODE FORCEDPWM MODE
1.58 1.56 1.54 OUTPUT VOLTAGE (V) 1.52 1.50 1.48 1.46 1.44 1.42 1.40 TA = +25C TA = -40C TA = +85C
1.55
1.53 OUTPUT VOLTAGE (V)
TA = +85C
1.51 TA = -40C TA = +25C
1.49
1.47
1.45 0 200 400 600 800 2.5 3.0 3.5 4.0 4.5 5.0 5.5 LOAD CURRENT (mA) INPUT VOLTAGE (V)
1000
LOAD CURRENT (mA)
4
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
Typical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT = 1.5V, EN1 = GND, EN2 = BATT, TA = +25C, unless otherwise noted.)
MAX1572
INPUT CURRENT vs. INPUT VOLTAGE WITH NO LOAD
MAX1572toc07
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1572 toc08
60 50 INPUT CURRENT (A) 40 30 20
VLX
2V/div
VOUT RIPPLE
10mV/div
IL 10 ILOAD = 500mA 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 200ns/div INPUT VOLTAGE (V)
500mA/div
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1572 toc09
SOFT-START/SHUTDOWN WAVEFORMS
MAX1572 toc10
VLX
2V/div
VEN2
2V/div
VOUT VOUT RIPPLE 20mV/div
1V/div
IL ILOAD = 20mA 2s/div
IIN 500mA/div
100mA/div
200s/div
RESET WAVEFORM
MAX1572 toc11
LOAD TRANSIENT, FORCED-PWM MODE
MAX1572 toc12
VEN2
2V/div VOUT 100mV/div
VOUT
1V/div
VRESET IIN 100ms/div
1V/div ILOAD ILOAD = 20mA TO 550mA 4s/div 500mA/div
100mA/div
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET MAX1572
Typical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT = 1.5V, EN1 = GND, EN2 = BATT, TA = +25C, unless otherwise noted.)
LOAD TRANSIENT, PULSE-SKIP MODE
MAX1572 toc13
LOAD TRANSIENT, PULSE-GROUP MODE
MAX1572 toc14
VOUT
100mV/div
VOUT
100mV/div
ILOAD ILOAD = 20mA TO 550mA 4s/div
500mA/div
ILOAD ILOAD = 20mA TO 550mA 4s/div
500mA/div
LINE TRANSIENT
MAX1572 toc15
VOUT
20mV/div
VIN
1V/div
IL VIN = 3.5V TO 4.0V 40s/div
200mA/div
6
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800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
Pin Description
PIN 1 NAME RESET FUNCTION Active-Low RESET Output. Open-drain output with internal 14k pullup to OUT. RESET is driven LOW in shutdown. Soft-Start Control. Connect a capacitor from SS to GND to set the soft-start time. Use a 1000pF or larger capacitor to eliminate inrush current during startup. With greater than 10F total output capacitance, increase CSS to COUT/10,000 for soft-start. In shutdown, SS is discharged internally with 100 to GND. Ground. Connect all ground pins to the exposed paddle. Output Sense Input. Connect to the output of the regulator. In shutdown, OUT is discharged internally with 14k to GND. Enable/Mode Control Input 2. See Table 1. Power Ground. Connect to exposed paddle. Inductor Connection. LX is high impedance in shutdown. Supply Voltage Input. Connect to a 2.6V to 5.5V source. Connect a 10F ceramic capacitor from BATT to GND. Enable/Mode Control Input 1. See Table 1. Analog Supply Input. Connect to BATT through a 10 resistor. Connect a 0.1F capacitor from ABATT to GND.
MAX1572
2 3, 5, 11 4 6 7 8 9 10 12 --
SS GND OUT EN2 PGND LX BATT EN1 ABATT
Exposed Exposed Paddle. Connect to GND and PGND. Paddle
Table 1. Mode Select Truth Table
MODE Shutdown Pulse group Pulse skip Forced PWM EN1 0 0 1 1 EN2 0 1 0 1
EN1 EN2 MODE SELECT CURRENT SENSE SLOPE COMP PWM CONTROL LX CLOCK 2MHz ABATT 0.1F 10 BATT 10F INPUT 2.6V TO 5.5V OUTPUT 0.75V TO 2.5V 800mA
A zero represents EN_ being driven low or connected to GND. A 1 represents EN_ being driven high or connected to BATT.
2.2H
Detailed Description
Figure 1 is the functional diagram.
MAX1572
RESET RESET TIMER 170ms REFERENCE
COUT PGND OUT EA GND
PWM Control Scheme
The MAX1572 uses a 2MHz fixed-frequency, pulsewidth-modulated (PWM), current-mode control scheme. The heart of the current-mode PWM controller is an open-loop comparator that compares the error amp voltage-feedback signal against the sum of the amplified current-sense signal and the slope compensation ramp. At each rising edge of the internal clock, the internal high-side P-channel MOSFET turns on until the PWM comparator trips. During this on-time, current ramps up through the inductor, sourcing current to the
THERMAL SHUTDOWN
SS 1000pF
Figure 1. Functional Diagram
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7
800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
output and storing energy in the inductor's magnetic field. The current-mode feedback system regulates the peak inductor current as a function of the output voltage error signal. Since the average inductor current is nearly the same as the peak inductor current (assuming that the inductor value is relatively high to minimize ripple current), the circuit acts as a switch-mode transconductance amplifier. This pushes the output LC filter pole, normally found in a voltage-mode PWM, to a higher frequency. To preserve inner-loop stability and eliminate inductor staircasing, an internal slope-compensation ramp is summed into the main PWM comparator. During the second half of the switching cycle (off-time), the internal high-side P-channel MOSFET turns off and the internal low-side N-channel MOSFET turns on. Now the inductor releases the stored energy as its current ramps down while still providing current to the output. The output capacitor stores charge when the inductor current exceeds the load current and discharges when the inductor current is lower, smoothing the voltage across the load. Under overload conditions, when the inductor current exceeds the current limit, the high-side MOSFET is turned off and the low-side MOSFET remains on for the remainder of the cycle to let the inductor current ramp down.
MAX1572
pulse-group mode. In pulse-skip mode, the output voltage ripple is lower, and the load-transient response faster. However, the quiescent current is higher than in pulse-group mode.
Forced-PWM Mode
In forced-PWM mode, the MAX1572 operates at a constant 2MHz switching frequency without pulse skipping. This is desirable in noise-sensitive applications, since the output ripple is minimized and has a predictable noise spectrum. Forced-PWM mode requires higher supply current with light loads due to constant switching.
100% Duty-Cycle Operation
The MAX1572 can operate at 100% duty cycle. In this state, the high-side P-channel MOSFET is turned on (not switching). This occurs when the input voltage is close to the output voltage. The dropout voltage is the voltage drop due to the output current across the on-resistance of the internal P-channel MOSFET (RDS(ON)P) and the inductor resistance (RL): VDROPOUT = IOUT x ( RDS(ON)P + RL ) RDS(ON)P is given in the Electrical Characteristics section. RL, for a few recommended inductors, is given in Table 2.
Pulse-Group Mode
Pulse-group mode is used to minimize the supply current with a light load. In pulse-group mode, the IC shuts off most internal circuitry when VOUT is +0.8% above nominal regulation. When VOUT drops below +0.8% of the nominal regulation voltage, the IC powers up its circuits and resumes switching.
Load-Transient Response/ Voltage Positioning
The MAX1572 uses voltage positioning that matches the load regulation to the voltage droop seen during load transients. In this way, the output voltage does not overshoot when the load is removed, which results in the total output-voltage variation being half as wide as in a conventional design. Figure 2 shows an example of a voltage-positioned and a nonvoltage-positioned load transient. Additionally, the MAX1572 uses a wide-bandwidth feedback loop to respond more quickly to a load transient than regulators using conventional integrating feedback loops. The load line used to achieve voltage positioning is shown in Figure 3. This assumes a nominal operating point of 3.6V input at 300mA load.
Pulse-Skip Mode
Pulse-skip mode is also used to minimize the supply current with a light load. The difference between pulsegroup and pulse-skip modes is that when VOUT rises above the +0.8% regulation point, pulse-group mode stops switching and completely turns off a number of circuits. Under the same conditions, pulse-skip mode stops switching but leaves all circuits on. The delay coming out of pulse-skip mode is shorter than with
Table 2. Recommended Inductors
MANUFACTURER Murata Sumida TOKO PART LQH32CN CDRH3D16 CDRH2D11 D312F D412F VALUE (H) 2.2 2.2 2.2 2.2 2.2 RL (m) 97 50 78 170 140 ISAT (mA) 790 1200 780 1200 1330 SIZE (mm) 2.5 x 3.2 x 2.0 3.8 x 3.8 x 1.8 3.2 x 3.2 x 1.2 3.6 x 3.6 x 1.2 4.8 x 4.8 x 1.2 SHIELDED No Yes Yes No No
8
_______________________________________________________________________________________
800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET MAX1572
+1
NORMAL OPERATION VIN = 3.6V FORCED-PWM
VOUT (VOLTAGE POSITIONING)
VOUT (CONVENTIONAL)
CHANGE IN OUTPUT 0 VOLTAGE (%)
VIN = 5.5V
-1
VIN = 2.6V
IOUT
-2 0 200 400 LOAD CURRENT (mA) 600 800
Figure 2. Load Transient Response, With and Without Voltage Positioning
Figure 3. Voltage-Positioning Load Line
Soft-Start
Soft-start is used to prevent input-current overshoot during startup. For most applications using a 10F output capacitor, connect a 1000pF capacitor from SS to GND. If a larger output capacitor is used, then use the following formula to find the value of the soft-start capacitor needed to prevent input-current overshoot: CSS = COUT /104 During soft-start, the output voltage rises from 0 to V OUT(nom) with a time constant equal to C SS times 100k (see the Typical Operating Characteristics).
current. For maximum efficiency, the inductor's DC resistance should be as low as possible. See Table 2 for recommended inductors and manufacturers.
Capacitor Selection
Ceramic 10F input and output capacitors are recommended for most applications. For output voltages below 1.5V, output capacitance should be increased to 22F. For best stability over a wide temperature range, use capacitors with an X5R or better dielectric.
ABATT Input Filter
In normal applications, an RC filter on ABATT keeps power-supply noise from entering the IC. Connect a 10 resistor between BATT and ABATT and connect a 0.1F capacitor from ABATT to GND.
170ms RESET
RESET is an open-drain output with an internal 14k pullup resistor to OUT. During startup, RESET is held low until 200ms (typ) after the output voltage reaches 90% of its nominal regulation voltage. When the output voltage drops below 90% of its nominal regulation voltage, RESET pulls low again. See the Typical Operating Characteristics section for RESET waveforms during startup and shutdown.
PC Board Layout and Routing
Due to fast-switching waveforms and high-current paths, careful PC board layout is required. An evaluation kit (MAX1572EVKIT) is available to speed design. When laying out a board, minimize trace lengths between the IC, the inductor, the input capacitor, and the output capacitor. Keep these traces short, direct, and wide. Keep noisy traces, such as the LX node trace, away from OUT. The input bypass capacitors should be placed as close to the IC as possible. Connect PGND and GND directly to the exposed paddle underneath the IC. The ground connections of the input and output capacitors should be as close together as possible.
Applications Information
Inductor Selection
A 2.2H inductor with a saturation current of at least 1A is recommended for full-load (800mA) applications. For lower load currents, the inductor current rating may be reduced. For most applications, use an inductor with a current rating 1.25 times the maximum required output
_______________________________________________________________________________________
9
800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET MAX1572
Selector Guide
PART MAX1572ETC075 MAX1572ETC130 MAX1572ETC150 MAX1572ETC180 MAX1572ETC250 MAX1572ETCxyz VOUT (V) 0.75 1.30 1.50 1.80 2.50 * TOP MARK AABW AACW AABX AABY AABZ --
Chip Information
TRANSISTOR COUNT: 3697 PROCESS: BiCMOS
*xyz is for output voltage (e.g., MAX1572ETC165 has a 1.65V output).
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.)
PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
10
______________________________________________________________________________________
24L QFN THIN.EPS
800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET
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.)
MAX1572
PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
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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