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19-2599; Rev 0; 10/02
500mA, Low-Voltage Linear Regulator in Tiny QFN
General Description
The MAX1935 low-dropout linear regulator operates from a 2.25V to 5.5V supply and delivers a guaranteed 500mA load current with low 175mV dropout. The highaccuracy (1.5%) output voltage is preset at an internally trimmed voltage or can be adjusted from 0.8V to 4.5V with an external resistive-divider. An internal PMOS pass transistor allows low 210A supply current, making this device ideal for portable equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and other equipment, including base stations and docking stations. Other features include an active-low, power-OK output that indicates when the output is out of regulation, a 0.02A shutdown mode, short-circuit protection, and thermal-shutdown protection. The MAX1935 comes in a tiny 1.9W, 8-pin 3mm x 3mm thin QFN package. o Guaranteed 500mA Output Current o Output Down to 0.8V o Low 175mV Dropout at 500mA o 1.5% Output Voltage Accuracy Preset at 1.5V Adjustable from 0.8V to 4.5V o Power-OK Output o Low 210A Ground Current o 0.02A Shutdown Current o Thermal-Overload Protection o Output Current Limit o Tiny 1.9W, 8-Pin 3mm x 3mm Thin QFN Package
Features
MAX1935
Ordering Information Applications
Notebook Computers Cellular and Cordless Telephones PDAs Palmtop Computers Base Stations USB Hubs Docking Stations
PART MAX1935ETA MAX1935ETA15 PART MAX1935ETA* MAX1935ETA15* TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 8 Thin QFN 3mm x 3mm 8 Thin QFN 3mm x 3mm
*Contact factory for preset output voltages.
Selector Guide
OUTPUT VOLTAGE Adjustable 1.5V TOP MARK ADB ADB
Typical Operating Circuit
RPOK 100k POK TO C VIN 2.25V TO 5.5V CIN 1F ON SHDN OFF GND OUT COUT 10F VOUT 0.8V TO 4.5V
Pin Configuration
TOP VIEW
R1
IN IN POK SHDN
1 2 3 4
8
OUT OUT SET GND
MAX1935
IN SET
MAX1935
7 6 5
R2
THIN QFN 3mm x 3mm
________________________________________________________________ Maxim Integrated Products
1
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, POK, SET to GND ...................................-0.3V to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 8-Pin Thin QFN (derate 24.4mW/C above +70C) .......1.95W Operating Temperature .......................................-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(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Input Undervoltage Lockout Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage TA = +25C, IOUT = 100mA SET Voltage Threshold (Adjustable Mode) Maximum Output Current Short-Circuit Current Limit SET Dual ModeTM Threshold SET Input Bias Current Ground-Pin Current ISET IQ VSET = 0.8V IOUT = 1mA IOUT = 500mA VOUT = 2.25V Dropout Voltage (Note 1) Line Regulation Load Regulation Output Voltage Noise SHUTDOWN Shutdown Supply Current SHDN Input Threshold SHDN Input Bias Current Startup Time IOFF VIH VIL I SHDN tSTART SHDN = GND or IN COUT = 10F, time from SHDN high to POK high 10 40 SHDN = GND, VIN = 5.5V 1.6 0.6 100 0.02 5 A V nA s VLNR VLDR IOUT = 500mA VOUT = 2.8V VOUT = 4V VIN from (VOUT + 100mV) to 5.5V, ILOAD = 5mA IOUT = 1mA to 500mA 10Hz to 1MHz, COUT = 10F (ESR < 0.1) VSET TA = +25C, IOUT = 1mA to 500mA TA = 0C to +85C, IOUT = 1mA to 500mA, VIN > VOUT + 0.5V VOUT = 0V SYMBOL VIN VUVLO Rising, 40mV hysteresis TA = +25C, IOUT = 100mA VOUT TA = +25C, IOUT = 1mA to 500mA TA = 0C to +85C, IOUT = 1mA to 500mA, VIN > VOUT + 0.5V CONDITIONS MIN 2.25 1.85 -1.5 -2.5 -3 0.8 788 780 774 500 600 35 -100 210 575 259 201 147 0 15.5 300 400 350 275 0.125 35 %/V ppm/mA VRMS mV 1400 80 2300 125 +100 600 800 2 TYP MAX 5.50 2.15 +1.5 +2.5 +3 4.5 812 820 826 mARMS mA mV nA A mV V % UNITS V V
IOUT ILIM
Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator in Tiny QFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER POWER-OK POK Output Low Voltage Operating Voltage Range for Valid POK Output Output High Leakage Current Threshold THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis TSHDN TSHDN 170 20 C C VOL Sinking 2mA Sinking 100A VPOK = 5.5V Rising edge, referred to VOUT(NOMINAL) 90 93 1.0 5 50 5.5 100 96 mV V nA % SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX1935
ELECTRICAL CHARACTERISTICS
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER Input Voltage Input Undervoltage Lockout Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage SET Voltage Threshold (Adjustable Mode) Maximum Output Current Short-Circuit Current Limit SET Dual Mode Threshold SET Input Bias Current Ground-Pin Current SHUTDOWN Shutdown Supply Current SHDN Input Threshold SHDN Input Bias Current IOFF VIH VIL I SHDN SHDN = GND, VIN = 5.5V 2.5V < VIN < 5.5V 2.5V < VIN < 5.5V SHDN = GND or IN 1.6 0.6 100 5 A V nA ISET IQ VSET = 0.8V IOUT = 1mA VSET IOUT ILIM VOUT = 0V IOUT = 1mA to 500mA SYMBOL VIN VUVLO VOUT Rising, 40mV hysteresis IOUT = 1mA to 500mA CONDITIONS MIN 2.25 1.85 -4 0.8 766 500 600 35 -100 2500 125 +100 400 TYP MAX 5.50 2.15 +4 4.5 834 UNITS V V % V mV mARMS mA mV nA A
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER POWER-OK POK Output Low Voltage Operating Voltage Range for Valid POK Output Output High Leakage Current Threshold VOL Sinking 2mA Sinking 100A VPOK = 5.5V Rising edge, referred to VOUT(NOMINAL) 89 1.0 50 5.5 100 97 mV V nA % SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 1: Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT and when VIN = VOUT(NOM) + 0.5V. For 2.25V VOUT 4V, dropout voltage limits are linearly interpolated from the values listed. For VOUT < 4V, dropout voltage limit is equal to the value for VOUT = 4V. Note 2: Specifications to -40C are guaranteed by design, not production tested.
Typical Operating Characteristics
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1F, COUT = 10F, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX1935 toc01
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1935 toc02
OUTPUT VOLTAGE vs. TEMPERATURE
VIN = VOUT + 500mV IOUT = 0
MAX1935 toc03
3.5 IOUT = 0mA 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 IOUT = 500mA
3.32 3.31 OUTPUT VOLTAGE (V) 3.30 3.29 3.28 3.27 3.26 3.25
3.34 3.33 OUTPUT VOLTAGE (V) 3.32 3.31 3.30 3.29 3.28
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 INPUT VOLTAGE (V)
0
100 200 300 400 500 600 700 800 LOAD CURRENT (mA)
-40
-15
10
35
60
85
TEMPERATURE (C)
DROPOUT VOLTAGE vs. LOAD CURRENT
350 DROPOUT VOLTAGE (mV) 300 250 200 150 100 50 0 0 100 200 300 400 500 600 700 800 LOAD CURRENT (mA) TA = -40C TA = +25C TA = +85C
MAX1935 toc04
DROPOUT VOLTAGE vs. OUTPUT VOLTAGE
0.28 DROPOUT VOLTAGE (V) 0.26 0.24 0.22 0.20 0.18 0.16 0.14 2.0 2.5 3.0 3.5 4.0 4.5 OUTPUT VOLTAGE (V) 600 550 500 450 400 350 300 250 200 150 100 50 0 2.0 2.5
MAX1935 toc05
GROUND-PIN CURRENT vs. INPUT VOLTAGE
MAX1935 toc06
400
GROUND-PIN CURRENT (A)
IOUT = 500mA
IOUT = 0mA
3.0
3.5
4.0
4.5
5.0
5.5
6.0
INPUT VOLTAGE (V)
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
Typical Operating Characteristics (continued)
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1F, COUT = 10F, TA = +25C, unless otherwise noted.) GROUND-PIN CURRENT vs. LOAD CURRENT
MAX1935 toc07
GROUND-PIN CURRENT vs. TEMPERATURE
VIN = VOUT + 500mV IOUT = 0
MAX1935 toc08
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX1935 toc09
500 450 GROUND-PIN CURRENT (A) 400 350 300 250 200 150 VIN = 5.5V VIN = 3.8V
200
-60 -50 -40
GROUND-PIN CURRENT (A)
190
180
PSRR (dB)
-30 -20
170
160
-10 0 -40 -15 10 35 60 85 TEMPERATURE (C)
150
COUT = 10F IOUT = 50mA 0.01 0.1 1 10 100 1000 FREQUENCY (kHz)
100 0 100 200 300 400 500 600 700 800 LOAD CURRENT (mA)
OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY (V/Hz) COUT = 10F IOUT = 50mA
MAX1935 toc10
OUTPUT NOISE DC TO 1MHz
MAX1935 toc11
10
1
0.1
VOUT 1mV/div
0.01 0.001 0.1 1 10 FREQUENCY (kHz) 100 1000 VOUT = 3.3V ROUT = 66 (50mA) 20ms/div
REGION OF STABLE COUT ESR vs. LOAD CURRENT
MAX1935 toc12
LOAD-TRANSIENT RESPONSE
MAX1935 toc13
100
REGION OF COUT ESR
10 COUT = 10F 1 STABLE REGION 0.1 VIN = VOUT + 500mV CIN = 10F ROUT = 660 TO 6.6 (5mA TO 500mA) 0 100 200 300 400 500 600 700 800 FREQUENCY (kHz) 10s/div
IOUT 200mA/div
VOUT 20mV/div
0.01
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
Typical Operating Characteristics (continued)
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1F, COUT = 10F, TA = +25C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE NEAR DROPOUT
MAX1935 toc14
LINE-TRANSIENT RESPONSE
MAX1935 toc15
6V
IOUT 200mA/div
VIN 1V/div 3V
VOUT 50mV/div VIN = VOUT + 100mV CIN = 10F ROUT = 660 TO 6.6 (5mA TO 500mA) 10s/div 200s/div VOUT 10mV/div
SHUTDOWN WAVEFORM
MAX1935 toc16
POK WAVEFORM
MAX1935 toc17
2V VSHDN 1V/div 0 3V VOUT 1V/div 0 ROUT = 6.6 (500mA) 20s/div ROUT = 66 (50mA) 200s/div
5V VIN 2V/div 0 VOUT 2V/div 0 VPOK 2V/div 0
Pin Description
PIN 1, 2 3 4 5 6 7, 8 NAME IN POK SHDN GND SET OUT FUNCTION Regulator Input. Supply voltage can range from 2.25V to 5.5V. Bypass with a 1F capacitor to GND (see the Capacitor Selection and Regulation Stability section). Connect both input pins together externally. Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (VOUT) is below the POK threshold. Connect a 100k pullup resistor from POK to OUT. Active-Low Shutdown Input. A logic low at SHDN reduces supply current to 0.02A. In shutdown, the POK output is low. Connect SHDN to IN for normal operation. Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the circuit-board ground plane to maximize power dissipation. Voltage-Setting Input. Connect SET to GND for preset output. Connect an external resistive voltage-divider from OUT to SET to set the output voltage between 0.8V and 4.5V. The SET regulation voltage is 800mV. Regulator Output. OUT sources up to 500mA. Bypass OUT with a 10F low-ESR capacitor to GND. Connect both OUT pins together externally.
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500mA, Low-Voltage Linear Regulator in Tiny QFN
Detailed Description
The MAX1935 is a low-dropout, low-quiescent-current linear regulator. The device supplies loads up to 500mA and is available with preset output voltages. As illustrated in Figure 1, the MAX1935 includes a 0.8V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The reference is connected to the error amplifier, which compares it 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, which allows more current to pass to the output increasing the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through either an internal resistive voltage-divider connected to OUT or an external resistor network connected to SET. The dualmode comparator examines VSET and selects the feedback path. If VSET is below 35mV, the internal feedback path is used, and the output is regulated to the factorypreset voltage. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. low. The capacitance and load at OUT determine the rate at which VOUT decays. SHDN can be pulled as high as 6V, regardless of the input and output voltage.
MAX1935
Power-OK Output
The POK output pulls low when OUT is less than 93% of the nominal regulation voltage. Once OUT exceeds 93% of the nominal voltage, POK goes high impedance. POK is an open-drain N-channel output. To obtain a logic voltage output, connect a pullup resistor from POK to OUT. A 100k resistor works well for most applications. POK can be used to signal a microcontroller (C), or drive an external LED to indicate power failure. When the MAX1935 is shutdown, POK is held low independent of the output voltage. If unused, leave POK grounded or unconnected.
Current Limit
The MAX1935 monitors and controls the pass transistor's gate voltage, limiting the output current to 1.4A (typ). The output can be shorted to ground for an indefinite period of time without damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX1935. When the junction temperature exceeds TJ = +170C, a thermal sensor turns off the pass transistor, allowing the device to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by +20C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection protects the MAX1935 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150C.
Internal P-Channel Pass Transistor
The MAX1935 features a 0.4 P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces operating current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX1935 does not suffer from these problems.
Output Voltage Selection
The MAX1935's dual-mode operation allows operation in either a preset voltage mode or an adjustable mode. Connect SET to GND to select the preset output voltage. The two-digit part number suffix identifies the output voltage. For example, the MAX1935ETA33 has a preset 3.3V output voltage. The output voltage can also be adjusted by connecting a voltage-divider from OUT to SET (Figure 2). Select R2 in the 25k to 100k range. Calculate R1 with the following equation: R1 = R2 [(VOUT / VSET) - 1] where VSET = 0.8V, and VOUT can range from 0.8V to 4.5V.
Operating Region and Power Dissipation
The MAX1935'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 air flow. The power dissipated in the device is P = IOUT (VIN V OUT ). The maximum allowed power dissipation is 1.95W or: PMAX = (TJ(MAX) - TA) / (JC + CA) where TJ - TA is the temperature difference between the MAX1935 die junction and the surrounding air, JC is the thermal resistance from 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. The MAX1935 package features an exposed thermal pad on its underside. This pad lowers the package's thermal resistance by providing
Shutdown
Drive SHDN low to enter shutdown. During shutdown, the output is disconnected from the input, and supply current drops to 0.02A. When in shutdown, POK pulls
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
VIN 2.25V TO 5.5V CIN 1F
IN IN
THERMAL SENSOR MOSFET DRIVER WITH ILIM OUT PRESET MODE VOUT 0.8V TO 3.3V COUT 10F
ON OFF
SHDN OUT SHUTDOWN LOGIC ERROR AMPLIFIER VREF 0.8V
LOGIC SUPPLY VOLTAGE (VOUT) RPOK 100k TO C POK
MAX1935
SET
93% VREF
80mV GND
Figure 1. Functional Diagram
a direct heat conduction path from the die to the PC board. Connect the exposed backside pad and GND to the system ground using a large pad or ground plane, or multiple vias to the ground plane layer. The MAX1935 delivers up to 0.5A(RMS) and operates with input voltages up to 5.5V, but not simultaneously. High output currents can only be sustained when inputoutput differential is within the limits outlined.
output capacitors. The output capacitor's (COUT) ESR affects stability and output noise. Use output capacitors with an ESR of 0.1 or less to ensure stability and optimum 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 MAX1935 as possible.
Noise, PSRR, and Transient Response
The MAX1935 is designed to operate with low dropout voltages and low quiescent currents, 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 passivefiltering techniques. The MAX1935 load-transient
Applications Information
Capacitor Selection and Regulator Stability
Connect a 1F capacitor between IN and ground and a 10F low equivalent series-resistance (ESR) capacitor between OUT and ground. The input capacitor (CIN) lowers the source impedance of the input supply. Reduce noise and improve load-transient response, stability, and power-supply rejection by using larger
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
600 0.8V MAXIMUM OUTPUT CURRENT (A) R1 = R2 IN VIN +2.25V TO +5.5V IN OUT OUT VOUT VOUT -1 TA = +70C 500 400 TA = +85C 300 200 100 0 0 R2 POK GND 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT-OUTPUT VOLTAGE DIFFERENCE (V)
CIN 1F ON SHDN OFF
MAX1935
COUT 10F
R1
SET
Figure 3. Power Operating Regions: Maximum Output Current vs. Input-Output Voltage Difference
Figure 2. Adjustable Output Using External Feedback Resistors
response graphs (see the Typical Operating Characteristics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient overshoot for a step change in the load current from 5mA to 500mA is 40mV. Increasing the output capacitor's value and decreasing the ESR attenuates the overshoot.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1806 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics): VDROPOUT = VIN - VOUT = RDS(ON) IOUT
Chip Information
TRANSISTOR COUNT: 949
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500mA, Low-Voltage Linear Regulator in Tiny QFN MAX1935
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
PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
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
PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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