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19-0458; Rev 1; 9/96
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference
_______________General Description
The MAX6120 is the lowest-power 1.2V, precision, three-terminal voltage reference offered in a SOT23 package. Ideal for 3V battery-powered equipment where power conservation is critical, the MAX6120 is a low-power alternative to existing two-terminal shunt references. Unlike two-terminal references that throw away battery current and require an external series resistor, the MAX6120 has a 70A maximum supply current (typically only 50A) that is independent of the input voltage. This feature translates to maximum efficiency at all battery voltages. The MAX6120 operates from a supply voltage as low as 2.4V, and initial accuracy is 1% for the SOT23 package. Output voltage temperature coefficient is typically only 30ppm/C, and is guaranteed to be less than 100ppm/C in the SOT23 package. For a guaranteed output voltage temperature coefficient of less than 50ppm/C, see the MAX6520 data sheet.
____________________________Features
o 3-Pin SOT23 Package o Supply Current Independent of Input Voltage Over Temperature o 50A Supply Current o 2.4V to 11V Input Voltage Range o 30ppm/C Typical Tempco (SOT23) o 1% Initial Accuracy (SOT23)
MAX6120
______________Ordering Information
PART MAX6120ESA MAX6120EUR TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 3 SOT23-3
________________________Applications
Battery-Powered Systems Portable and Hand-Held Equipment Data-Acquisition Systems Instrumentation and Process Control
TOP VIEW
_________________Pin Configurations
VIN 1
__________Typical Operating Circuit
V+ 2.4V to 11V VIN
MAX6120
VOUT 2
3 GND
SOT23
MAX6120
0.1F VOUT
VOUT 1.2V
VOUT 1 N.C. 2 N.C. 3 GND 4
8 7
VIN N.C. N.C. N.C.
MAX6120
6 5
GND
SO
0V
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference MAX6120
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN) ..............................................-0.3V to +12V VOUT ............................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ..........Continuous to Either Supply Continuous Power Dissipation (TA = +70C) SOT23 (derate 4mW/C above +70C) ...........................320mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+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.
DC ELECTRICAL CHARACTERISTICS
(VIN = 2.4V, ILOAD = 0mA, TA = +25C, unless otherwise noted.) PARAMETER Output Voltage Output Voltage Temperature Coefficient Output Voltage Noise Line Regulation Load Regulation Quiescent Supply Current Change in Supply Current vs. Input Voltage Short-Circuit Output Current SYMBOL VOUT TCVOUT en VOUT/VIN CONDITIONS MAX6120EUR (SOT23) TA = +25C TA = TMIN to TMAX (Note 2) MIN 1.188 1.176 30 10 400 2 0.1 50 30 1 58 70 1.5 4.3 400 5 TYP 1.200 MAX 1.212 1.224 100 UNITS V V ppm/C Vp-p V/V V/A A A/V mA A
MAX6120EUR (SOT23), TA = TMIN to TMAX (Note 2) 0.1Hz to 10Hz 10Hz to 10kHz VIN = 2.4V to 11V, TA = TMIN to TMAX (Note 1) TA = +25C TA = TMIN to TMAX (Note 1) VIN = 2.4V to 11V VOUT shorted to GND VOUT shorted to VIN
VOUT/IOUT ILOAD = -50A to 400A (Note 1) IQ IQ/VIN ISC
Note 1: Production testing done at TA = +25C, over temperature limits guaranteed by parametric correlation data. Note 2: Contact factory for availability of a higher-grade, lower-TC option in a SOT23 package.
__________________________________________Typical Operating Characteristics
(VIN = 3V, ILOAD = 0mA, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6120 TOC-01
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX6120-02
SUPPLY CURRENT vs. TEMPERATURE
MAX6120 TOC-02
80
1.20010
75
SUPPLY CURRENT (A)
1.20005
70
SUPPLY CURRENT (A)
70 VIN = 9V 65 VIN = 5V VIN = 3V 55
OUTPUT VOLTAGE (V)
1.20000
60
60
1.19995
50 2 3 4 5 6 7 8 9 10 11 INPUT VOLTAGE (V)
1.19990 2 3 4 5 6 7 8 9 10 11 INPUT VOLTAGE (V)
50 -50 -25 0 25 50 75 100 TEMPERATURE (C)
2
_______________________________________________________________________________________
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference
____________________________Typical Operating Characteristics (continued)
(VIN = 3V, ILOAD = 0mA, TA = +25C, unless otherwise noted.)
LOAD REGULATION vs. TEMPERATURE
MAX6120 TOC-03
MAX6120
OUTPUT VOLTAGE vs. SOURCE CURRENT
MAX1620 TOC-05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX1620 TOC-06
0.32 LOAD REGULATION (V/A)
1.2001
100
OUTPUT VOLTAGE (V)
0.24
1.2000 PSRR (dB)
80
0.16
1.1999
60
0.08
1.1998
40
0 -50 -25 0 25 50 75 100 TEMPERATURE (C)
1.1997 1 10 100 1000 SOURCE CURRENT (A)
20 0.001
0.01
0.1
1
10
100
FREQUENCY (kHz)
0.1Hz TO 100Hz NOISE
LOAD-TRANSIENT RESPONSE
A 50V/div B
1s/div
10s/div A = OUTPUT CURRENT, 50A/div, ILOAD = 0A TO -50A B = OUTPUT VOLTAGE, 100mV/div
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
A
IN
A
B
OUT
B
10s/div A = OUTPUT CURRENT, 500A/div, ILOAD = 0A TO 500A B = OUTPUT VOLTAGE, 100mV/div
5s/div A = INPUT VOLTAGE, 100mV/div, VIN = 3V 50mV B = OUTPUT VOLTAGE, 10mV/div
_______________________________________________________________________________________
3
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference MAX6120
_____________________Pin Description
PIN NAME SOT23 1 2 3 -- SO 8 1 4 2, 3, 5, 6, 7 VIN VOUT GND N.C. Input Voltage Reference Output Ground No Connect--not internally connected FUNCTION
__________Applications Information
Input Bypassing
For the best line-transient performance, decouple the input with a 0.1F ceramic capacitor as shown in the Typical Operating Circuit. Locate the capacitor as close to the device pin as possible. Where transient performance is less important, no capacitor is necessary.
Output Bypass
The MAX6120 performs well without an output decoupling capacitor. If your application requires an output charge reservoir (e.g., to decouple the reference from the input of a DAC), then make sure that the total output capacitive load does not exceed 10nF.
+3V
VIN 1
VOUT
MAX6120
3
2 0.01F +3V
0.1F
DIN 1 SCLK 3
CS 2
REFAB 12 11
REFC
OUTA DAC LATCH A DAC A 8
VIN 1
VOUT
R
R
MAX6120
3
2 7 6 -1.2V
OUTB 16-BIT SHIFT REGISTER DATA (8) DAC LATCH B DAC B 9
+1.2V
2
MAX406A
3 DAC LATCH C OUTC DAC C 10 4 -3V
CONTROL (8)
MAX512 MAX513
LOUT LATCH 14 4 RESET 5 VDD 7 VSS 6 GND
Figure 2. Low-Power 1.2V Reference
___________________Chip Information
TRANSISTOR COUNT: 39
Figure 1. 3V, Triple, 8-Bit Serial DAC
4
_______________________________________________________________________________________
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference
__________________________________________________Tape-and-Reel Information
4.00.1 o1.50.1 2.00.05 1.750.1
MAX6120
8.00.2
4.00.1
3.50.05 o1.10.1
MARKING INFORMATION LOT SPECIFIC CODE AY X X = MAX6120
NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD.
ICs MAY ALSO BE MARKED WITH FULL PART NAME: MAX6120
_______________________________________________________________________________________
5
Low-Cost, Micropower, Precision, 3-Terminal, 1.2V Voltage Reference MAX6120
________________________________________________________Package Information
B
DIM A A1 B C D E e H L S INCHES MAX MIN 0.047 0.031 0.005 0.001 0.022 0.014 0.0034 0.006 0.120 0.105 0.055 0.047 0.080 0.070 0.098 0.082 0.012 0.004 0.022 0.017 8 0 MILLIMETERS MIN MAX 0.787 1.194 0.025 0.127 0.356 0.559 0.086 0.152 2.667 3.048 1.194 1.397 1.778 2.032 2.083 2.489 0.102 0.305 0.432 0.559 0 8
21-0051B
E
H
S
D
A
3-PIN SOT23-3 SMALL-OUTLINE TRANSISTOR PACKAGE
A1
e
C
L
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.
6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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