General Description
The MAX6037 family of low-dropout, micropower volt-
age references offer fixed and adjustable output volt-
age options ranging from 1.184V to 5V. Connect an
external resistive-divider on the MAX6037_ADJ to
adjust the output voltage from 1.184V to 5V. The other
devices in the MAX6037 family feature fixed output volt-
ages of 1.25V, 2.048V, 2.5V, 3.0V, 3.3V, and 4.096V.
The MAX6037 offers shutdown functionality with an
active-low shutdown (500nA, max).
These series-mode voltage references operate from a
2.5V to 5.5V supply and consume 275µA (max) quies-
cent current. The output is stable driving loads from
0.02µF to 1µF and can source and sink 5mA of load
current. The MAX6037 offers a low temperature coeffi-
cient of 25ppm/°C and initial accuracy of ±0.2% (max).
The low dropout voltage (100mV, max at 1mA) and
supply-independent, low supply current make the
MAX6037 ideal for battery-powered applications.
The MAX6037 is available in the miniature 5-pin SOT23
package and is specified over the -40°C to +125°C
automotive temperature range.
Applications
Medical Equipment Portable Equipment
Wireless LAN Precision Regulators
Features
♦Adjustable VOUT: 1.184V to 5V
♦Fixed Outputs: 1.25V, 2.048V, 2.5V, 3.0V, 3.3V,
and 4.096V
♦Shutdown Current <500nA (max)
♦25ppm/°C (max) Temperature Coefficient (A Grade)
♦±0.2% (max) Initial Accuracy (A Grade)
♦Low 100mV (max) Dropout Voltage at 1mA Load
Current
♦2.5V to 5.5V Input Voltage Range
♦5mA Sink and Source Current Capability
♦Available in 5-Pin SOT23 Package
♦Operates Over the Automotive Temperature
Range: -40°C to +125°C
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
________________________________________________________________ Maxim Integrated Products 1
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX6037AAUK12-T
-40°C to +125°C5 SOT23-5
AEIV
MAX6037BAUK12-T
-40°C to +125°C5 SOT23-5
AEIW
MAX6037CAUK12-T
-40°C to +125°C5 SOT23-5
AEIX
Ordering Information
PART OUTPUT
VOLTAGE (V)
MAX
TEMPCO
(ppm/°C)
INITIAL
ACCURACY
(%, max)
MAX6037AAUK12
1.25 25 0.2
MAX6037BAUK12
1.25 50 0.3
MAX6037CAUK12
1.25 50 0.5
MAX6037AAUK21
2.048 25 0.2
MAX6037BAUK21
2.048 50 0.3
MAX6037CAUK21
2.048 50 0.5
MAX6037AAUK25
2.5 25 0.2
MAX6037BAUK25
2.5 50 0.3
MAX6037CAUK25
2.5 50 0.5
MAX6037AAUK30
3.0 25 0.2
MAX6037BAUK30
3.0 50 0.3
MAX6037CAUK30
3.0 50 0.5
MAX6037AAUK33
3.3 25 0.2
MAX6037BAUK33
3.3 50 0.3
MAX6037CAUK33
3.3 50 0.5
MAX6037AAUK41
4.096 25 0.2
MAX6037BAUK41
4.096 50 0.3
MAX6037CAUK41
4.096 50 0.5
M AX 6037AAU KAD J*
1.184 to 5, adj
25 0.2
M AX 6037BAU KAD J*
1.184 to 5, adj
50 0.3
M AX 6037C AU KAD J*
1.184 to 5, adj
50 0.5
Selector Guide
19-3192; Rev 0; 2/04
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.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
OUT
* OPTIONAL
*
IN
2.5V TO 5.5V INPUT
GND
SHDN
REFERENCE
OUTPUT
0.02µF
TO 1µF
MAX6037
Pin Configuration appears at end of data sheet.
*The accuracy of the MAX6037_ADJ is dependent on the
accuracy of the external resistors. Use 1% resistors with low
temperature coefficient for best overall accuracy.
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX6037_12 (VOUT = 1.25V)
(VIN = VSHDN = +3V, IOUT = 0, COUT = 0.1µF, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
IN, OUT, SHDN, ADJ to GND...................................-0.3V to +6V
Output Short Circuit to GND or IN............................. Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
MIN TYP MAX
UNITS
1.2475 1.250 1.2525
1.2462 1.250 1.2538
1.2438 1.250 1.2563
ppm/°C
∆VOUT/∆VIN
0.0006 0.0096
0.008 0.072
0.006 0.072
0.025 0.12
∆VOUT/∆IOUT
0.014 0.12
%/mA
∆VOUT/cycle 485
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
360
125
0.02
190
0.05
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—MAX6037_12 (VOUT = 1.25V) (continued)
(VIN = VSHDN = +3V, IOUT = 0, COUT = 0.1µF, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MIN
TYP
MAX
UNITS
-1000 0.15 +1000
-1000 0.05 +1000
ELECTRICAL CHARACTERISTICS—MAX6037_21 (VOUT = 2.048V)
(VIN = VSHDN = +3V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
2.0439 2.0480 2.0521
2.0418 2.0480 2.0542
2.0378 2.0480 2.0582
ppm/°C
∆VOUT/∆VIN
0.0008 0.0107
0.006 0.044
0.004 0.044
0.02 0.195
∆VOUT/∆IOUT
0.01 0.195
%/mA
∆VOUT/cycle 458
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
2.1
205
0.02
190
0.05
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
4_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6037_21 (VOUT = 2.048V) (continued)
(VIN = VSHDN = +3V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
-1000 0.15 +1000
-1000 0.05 +1000
ELECTRICAL CHARACTERISTICS—MAX6037_25 (VOUT = 2.500V)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
2.4950 2.500 2.5050
2.4925 2.500 2.5075
2.4875 2.500 2.5125
ppm/°C
∆VOUT/∆VIN
0.0004 0.012
0.005 0.036
0.003 0.036
0.02
∆VOUT/∆IOUT
0.01
%/mA
VIN - VOUT
190
∆VOUT/cycle 514
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
250
0.02
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS—MAX6037_30 (VOUT = 3.000V)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
2.9940 3.000 3.0060
2.9910 3.000 3.0090
2.9850 3.000 3.0150
ppm/°C
∆VOUT/∆VIN
0.0004 0.0133
0.005 0.035
0.008 0.03
0.02
∆VOUT/∆IOUT
0.01
%/mA
VIN - VOUT
190
∆VOUT/cycle 501
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
ELECTRICAL CHARACTERISTICS—MAX6037_25 (VOUT = 2.500V) (continued)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
210
0.05
0.75
-1000 0.15 +1000
-1000 0.05 +1000
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
6_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6037_30 (VOUT = 3.000V) (continued)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
300
0.02
210
0.05
-1000 0.15 +1000
-1000 0.05 +1000
ELECTRICAL CHARACTERISTICS—MAX6037_33 (VOUT = 3.300V)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
3.2934 3.300 3.3066
3.2901 3.300 3.3099
3.2855 3.300 3.3165
ppm/°C
∆VOUT/∆VIN
0.0003 0.0133
0.005 0.027
0.002 0.027
0.02 0.212
∆VOUT/∆IOUT
0.01 0.212
%/mA
VIN - VOUT
190
∆VOUT/cycle 514
ppm
∆VOUT/time
133
ppm
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS—MAX6037_41 (VOUT = 4.096V)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
4.0878 4.096 4.1042
4.0837 4.096 4.1083
4.0755 4.096 4.1165
ppm/°C
∆VOUT/∆VIN
0.0003 0.0105
0.004 0.35
0.002 0.027
0.02 0.212
∆VOUT/∆IOUT
0.01 0.212
%/mA
ELECTRICAL CHARACTERISTICS—MAX6037_33 (VOUT = 3.300V) (continued)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN TYP MAX
UNITS
µVP-P
µVRMS
330
0.02
210
0.05
-1000 0.15 +1000
-1000 0.05 +1000
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
8_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6037_41 (VOUT = 4.096V) (continued)
(VIN = VSHDN = +5V, IOUT = 0, COUT = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
MIN
TYP
MAX
UNITS
VIN - VOUT
190
∆VOUT/cycle 524
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
410
0.02
210
0.05
-1000 0.15 +1000
-1000 0.05 +1000
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
_______________________________________________________________________________________ 9
ELECTRICAL CHARACTERISTICS—MAX6037_ADJ (VOUT = 1.184V to 5V)
(VIN = VSHDN = +5V, IOUT = 0, TA = TMIN to TMAX, ADJ shorted to OUT unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
MIN TYP MAX
UNITS
1.1816 1.1840 1.1864
1.1805 1.1840 1.1875
Initial Output Voltage (Note 6)
1.1781 1.1840 1.1899
1.184 VIN - 0.15
ppm/°C
∆VOUT/∆VIN
0.0008 0.013
0.012 0.078
0.014
0.005 0.12
∆VOUT/∆IOUT
0.005 0.12
%/mA
VIN - VOUT
190
∆VOUT/cycle 421
ppm
∆VOUT/time
133
ppm
µVP-P
µVRMS
360
>10
0.02
200
0.15
MAX6037_25 OUTPUT VOLTAGE
vs. TEMPERATURE (VOUT = 2.500V)
MAX6037 toc01
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
10075-25 025 50
2.4925
2.4950
2.4975
2.5000
2.5025
2.5050
2.5075
2.5100
2.4900
-50 125
MAX6037_12 SUPPLY CURRENT
vs. INPUT VOLTAGE (VOUT = 1.25V)
MAX6037 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
5.04.54.03.53.0
180
190
200
210
220
230
170
2.5 5.5
TA = +125°C
TA = +25°C
TA = -40°C
MAX6037_12 SUPPLY CURRENT
vs. TEMPERATURE (VOUT = 1.25V)
MAX6037 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
1007550250-25
175
200
225
250
150
-50 125
VIN = +2.5V
VIN = +5.5V
Typical Operating Characteristics
(VIN = +3V for the MAX6037_12 and MAX6037_21; VIN = +5V for the MAX6037_25, MAX6037_30, MAX6037_33, and MAX6037_41;
IOUT = 0, COUT = 0.1µF, CIN = 0.1µF, TA= +25°C, unless otherwise specified.)
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
10 ______________________________________________________________________________________
Note 1: All devices are 100% tested at TA= +25°C and are guaranteed by design for TA= TMIN to TMAX, as specified.
Note 2: Temperature coefficient is measured by the “box” method, i.e., the maximum ∆VOUT / VOUT is divided by the maximum ∆T.
Note 3: Thermal hysteresis is defined as the change in +25°C output voltage before and after cycling the device from TMAX to
TMIN.
Note 4: Not production tested. Guaranteed by design.
Note 5: Dropout voltage is defined as the minimum differential voltage (VIN - VOUT) at which VOUT decreases by 1% from its origi-
nal value at VIN = +5.0V.
Note 6: VOUT initial accuracy for the MAX6037_ADJ is tested with ADJ shorted to OUT. Actual accuracy will be affected by match-
ing and the temperature coefficient of the external resistors used. Use 1% resistors with low temperature coefficient for
best overall accuracy.
Note 7: The temperature coefficient for the MAX6037_ADJ is specified for the case where ADJ is connected to OUT. For the case
where an external resistive network is used to set the output voltage, actual change in reference output over temperature
will be affected by the temperature coefficient and matching of the external resistors used.
Note 8: The minimum VIN is the greater of +2.5V and (VOUT + 0.2V).
Note 9: VOUT set to +5V with an external resistive-divider.
Note 10: Noise for the MAX6037_ADJ is specified for a +1.25V output. Noise is proportional to VOUT and is greater for higher output
voltages. In addition, external resistors used to set the output voltage can contribute to noise.
MIN TYP MAX
UNITS
-1000 0.15 +1000
-1000 0.05 +1000
ELECTRICAL CHARACTERISTICS—MAX6037_ADJ (VOUT = 1.184V to 5V) (continued)
(VIN = VSHDN = +5V, IOUT = 0, TA = TMIN to TMAX, ADJ shorted to OUT unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
______________________________________________________________________________________ 11
MAX6037_25 DROPOUT VOLTAGE
vs. SOURCE CURRENT (VOUT = 2.500V)
MAC6037 toc04
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (mV)
8642
100
200
300
400
500
600
0
010
TA = +125°C
TA = +25°C
TA = -40°C
MAX6037_12
LOAD REGULATION (VOUT = 1.25V)
MAX6037 toc05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
50-5
-1
0
1
2
3
4
-2
-10 10
TA = +125°C
TA = +125°C
TA = +25°C
TA = -40°CTA = -40°C
SINKING CURRENT
SOURCING CURRENT
MAX6037_41
LOAD REGULATION (VOUT = 4.096V)
MAX6037 toc06
OUTPUT VOLTAGE CHANGE (mV)
-2
-1
0
1
2
3
4
5
6
-3
OUTPUT CURRENT (mA)
50-5-10 10
TA = +125°C
TA = +125°C
TA = +25°C
TA = -40°C
TA = -40°C
SINKING CURRENT
SOURCING CURRENT
MAX6037_12 LINE REGULATION
vs. TEMPERATURE (VOUT = 1.25V)
MAX6037 toc07
INPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (µV)
5.04.54.03.53.0
-60
-40
-20
0
-80
2.5 5.5
TA = +125°C
TA = +25°C
TA = -40°C
MAX6037_25
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 2.500V)
MAX6037 tpc08
FREQUENCY (kHz)
PSRR (dB)
1001010.10.01
-100
-80
-60
-40
-20
0
-120
0.001 1000
MAX6037_41 SHUTDOWN CURRENT
vs. TEMPERATURE (VOUT = 4.096V)
MAX6037 toc09
TEMPERATURE (C)
SHUTDOWN CURRENT (nA)
1007550250-25
0
0.5
1.0
1.5
2.0
2.5
3.0
-0.5
-50 125
MAX6037_12 LINE TRANSIENT
(VOUT = 1.25V)
MAX6037 toc10
400µs/div
VOUT
AC-COUPLED
10mV/div
+3V
VIN
+3.3V
COUT = 0.1µF
CIN = 0
MAX6037_41 LINE TRANSIENT
(VOUT = 4.096V)
MAX6037 toc11
400µs/div
VOUT
AC-COUPLED
10mV/div
5V
VIN
5.5V
COUT = 0.1µF
CIN = 0
MAX6037_12 LOAD TRANSIENT
(VOUT = 1.25V)
MAX6037 toc12
1ms/div
VOUT
AC-COUPLED
2mV/div
-10µA
IOUT
+10µA
COUT = 1µF
Typical Operating Characteristics (continued)
(VIN = +3V for the MAX6037_12 and MAX6037_21; VIN = +5V for the MAX6037_25, MAX6037_30, MAX6037_33, and MAX6037_41;
IOUT = 0, COUT = 0.1µF, CIN = 0.1µF, TA= +25°C, unless otherwise specified.)
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
12 ______________________________________________________________________________________
MAX6037_12 LOAD TRANSIENT
(VOUT = 1.25V)
MAX6037 toc13
400µs/div
VOUT
AC-COUPLED
2mV/div
-10µA
IOUT
+10µA
COUT = 0.02µF
MAX6037_12 LOAD TRANSIENT
(VOUT = 1.25V)
MAX6037 toc14
1ms/div
VOUT
AC-COUPLED
200mV/div
-5mA
IOUT
+5mA
COUT = 1µF
MAX6037_12 LOAD TRANSIENT
(VOUT = 1.25V)
MAX6037 toc15
1ms/div
VOUT
AC-COUPLED
200mV/div
-5mA
IOUT
+5mA
COUT = 0.02µF
MAX6037_41 LOAD TRANSIENT
(VOUT = 4.096V)
MAX6037 toc16
1ms/div
VOUT
AC-COUPLED
2mV/div
-10µA
IOUT
+10µA
COUT = 1µF
MAX6037_41 LOAD TRANSIENT
(VOUT = 4.096V)
MAX6037 toc17
1ms/div
VOUT
AC-COUPLED
5mV/div
-10µA
IOUT
+10µA
COUT = 0.02µF
MAX6037_41 LOAD TRANSIENT
(VOUT = 4.096V)
MAX6037 toc18
1ms/div
VOUT
AC-COUPLED
200mV/div
-5mA
IOUT
+5mA
COUT = 1µF
MAX6037_41 LOAD TRANSIENT
(VOUT = 4.096V)
MAX6037 toc19
1ms/div
VOUT
AC-COUPLED
200mV/div
-5mA
IOUT
+5mA
COUT = 0.02µF
MAX6037_12 TURN-ON TRANSIENT
(VOUT = 1.25V)
MAX6037 toc20
40µs/div
VOUT
500mV/div
GND
GND
VIN
+3V
+1.25V
COUT = 0.02µF
MAX6037_41 TURN-ON TRANSIENT
(VOUT = 4.096V)
MAX6037 toc21
400µs/div
VOUT
2V/div
GND
GND
VIN
+5V
4.096V
COUT = 0.02µF
Typical Operating Characteristics (continued)
(VIN = +3V for the MAX6037_12 and MAX6037_21; VIN = +5V for the MAX6037_25, MAX6037_30, MAX6037_33, and MAX6037_41;
IOUT = 0, COUT = 0.1µF, CIN = 0.1µF, TA= +25°C, unless otherwise specified.)
MAX6037
Low-Power, Fixed and Adjustable
Reference with Shutdown in SOT23
______________________________________________________________________________________ 13
MAX6037_12 SHUTDOWN TRANSIENT
(VOUT = 1.25V)
MAX6037 toc22
2ms/div
VOUT
500mV/div
GND
GND
VSHDN
+3V
1.25V
COUT = 0.02µF
MAX6037_12
EXITING SHUTDOWN TRANSIENT
(VOUT = 1.25V)
MAX6037 toc23
10µs/div
VOUT
500mV/div
GND
GND
VSHDN
+3V
1.25V
COUT = 0.02µF
MAX6037_41 SHUTDOWN TRANSIENT
(VOUT = 4.096V)
MAX6037 toc24
10ms/div
VOUT
2V/div
GND
GND
VSHDN
+5V
+4.096V
COUT = 0.02µF
MAX6037_41
EXITING SHUTDOWN TRANSIENT
(VOUT = 4.096V)
MAX6037 toc25
400µs/div
VOUT
2V/div
GND
GND
VSHDN
+5V
+4.096V
COUT = 0.02µF
Typical Operating Characteristics (continued)
(VIN = +3V for the MAX6037_12 and MAX6037_21; VIN = +5V for the MAX6037_25, MAX6037_30, MAX6037_33, and MAX6037_41;
IOUT = 0, COUT = 0.1µF, CIN = 0.1µF, TA= +25°C, unless otherwise specified.)
MAX6037_25 LONG-TERM STABILITY
vs. TIME (VOUT = 2.500V)
MAX6037 toc26
TIME (HOURS)
VOUT (V)
800600200 400
2.4985
2.4990
2.4995
2.5000
2.5005
2.5010
2.5015
2.5020
2.4980
01000
TWO TYPICAL PARTS
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
14 ______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
I.C.
Internally connected. (All fixed output
voltage options.) Do not connect anything
to this pin.
1
ADJ
Output Voltage Adjustment Connection.
Connect a resistor-divider between OUT,
ADJ and GND to set the output voltage.
(MAX6037_ADJ only).
2GND Ground
3
SHDN
Active-Low Shutdown Input. Pull SHDN
low to disable the device. Connect SHDN
to IN for normal operation.
4IN
Supply Voltage Input. Bypass with a 0.1µF
to 1µF capacitor to GND.
5OUT
Reference-Voltage Output. Connect an
output capacitor to GND in the 0.02µF to
1µF range.
Typical Operating Characteristics (continued)
(VIN = +3V for the MAX6037_12 and MAX6037_21; VIN = +5V for the MAX6037_25, MAX6037_30, MAX6037_33, and MAX6037_41;
IOUT = 0, COUT = 0.1µF, CIN = 0.1µF, TA= +25°C, unless otherwise specified.)
Note 12: Many of the MAX6037 family Typical Operating Characteristics are extremely similar. The extremes of these characteristics
are found in the MAX6037_12 (1.25V output) and the MAX6037_41 (4.096V output). The Typical Operating Characteristics of
the remainder of the MAX6037 family typically lie between those two extremes and can be estimated based on their output
voltages.
MAX6037_41 OUTPUT NOISE
(0.1Hz TO 10Hz)
MAX6037 toc27
1s/div
VOUT
10µV/div
VOUT = 4.096V
MAX6037_12 OUTPUT NOISE
(0.1Hz TO 10Hz)
MAX6037 toc28
1s/div
VOUT
2µV/div
VOUT = 1.25V
GND
INSHDN
( ) MAX6037_AUKADJ.
15OUTI.C. (ADJ)
MAX6037
SOT23
TOP VIEW
2
34
Pin Configuration
Detailed Description
The MAX6037 is a family of low-dropout, micropower
voltage references. These devices all feature a shut-
down mode by forcing SHDN low, dropping the quies-
cent current to less than 500nA. The MAX6037 can sink
and source up to 5mA with less than 410mV of dropout
voltage, making them attractive for use in low-voltage
applications. The MAX6037 is available in six fixed out-
put voltages of 1.25V, 2.048V, 2.5V, 3.0V, 3.3V and
4.096V, and an adjustable output version for voltages
between the range of 1.184V and 5V.
Shutdown
The MAX6037 features an active-low shutdown mode.
Pulling SHDN low disables the output and forces the
quiescent current to less than 500nA (typically 50pA).
Connect SHDN to IN for normal operation.
MAX6037_ADJ Adjustable Output Voltage
Set the output voltage on the MAX6037_ADJ by placing
a resistor-divider network between OUT, ADJ, and GND
(See Figure 1). Use the following formula to calculate
the output voltage:
where VADJ = 1.184V. Set R2 = 1MΩor less. Currents
through Resistor R1 and R2 add to the quiescent supply
current.
Supply Current
The quiescent supply current of the series-mode
MAX6037 family is typically 190µA to 210µA. When the
supply voltage is below the minimum-specified input
voltage during turn-on, the device can draw up to
250µA beyond the nominal supply current. The input
voltage source must be capable of providing this cur-
rent to ensure reliable turn-on.
Thermal Hysteresis
Output voltage hysteresis is the change of output volt-
age at TA= +25°C before and after the device is
cycled over its entire operating temperature range. The
typical thermal hysteresis value is 500ppm.
VR
RV
OUT ADJ
=+
11
2
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
______________________________________________________________________________________ 15
OUT
R2
ADJ
* OPTIONAL
*
IN
2.5V TO 5.5V INPUT
GND
SHDN
R1
REFERENCE
OUTPUT
0.02µF
TO 1µF
MAX6037_ADJ
Figure 1. MAX6037_ADJ Typical Operating Circuit
TEMPERATURE
COEFFICIENT
(ppm/°C)
110 100
16-BIT
14-BIT
12-BIT
10-BIT
8-BIT
0.01
0.1
10
100
1000
1
10,000
18-BIT
20-BIT
OPERATING TEMPERATURE RANGE (TMAX - TMIN) (°C)
Figure 2. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
16 ______________________________________________________________________________________
Chip Information
TRANSISTOR COUNT: 372
PROCESS: BiCMOS
Turn-On Time
These devices typically turn on and settle to within
0.1% of their final value in 360µs to 3.2ms, depending
on the device. The turn-on time can increase up to
10ms with the device operating at the minimum
dropout voltage and the maximum capacitive load.
Applications Information
Input Bypassing
For the best transient performance, decouple the input
with a 0.1µF to 1µF ceramic capacitor as shown in the
Typical Operating Circuit. Locate the capacitor as
close to IN as possible. No capacitor is necessary if
transient performance is less important.
Output/Load Capacitance
Devices in the MAX6037 family require an output capaci-
tance in the range of 0.02µF to 1µF for frequency stability.
Temperature Coefficient vs. Operating
Temperature Range for a 1 LSB
Maximum Error
In a data converter application, the reference voltage of
the converter must stay within a certain limit to keep the
error in the data converter smaller than the resolution
limit throughout the operating temperature range.
Figure 2 shows the maximum allowable reference volt-
age temperature coefficient to keep the conversion
error to less than 1 LSB, as a function of the operating
temperature range (TMAX - TMIN) with the converter
resolution as a parameter. The graph assumes the ref-
erence voltage temperature coefficient as the only
parameter affecting accuracy.
In reality, the absolute static accuracy of a data con-
verter is dependent on the combination of many para-
meters such as integral nonlinearity, differential
nonlinearity, offset error, gain error, as well as voltage
reference changes.
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX6037AAUK21-T
-40°C to +125°C5 SOT23-5
AEIY
MAX6037BAUK21-T
-40°C to +125°C5 SOT23-5
AEIZ
MAX6037CAUK21-T
-40°C to +125°C5 SOT23-5
AEJA
MAX6037AAUK25-T
-40°C to +125°C5 SOT23-5
AEJB
MAX6037BAUK25-T
-40°C to +125°C5 SOT23-5
AEJC
MAX6037CAUK25-T
-40°C to +125°C5 SOT23-5
AEJD
MAX6037AAUK30-T
-40°C to +125°C5 SOT23-5
AEJE
MAX6037BAUK30-T
-40°C to +125°C5 SOT23-5
AEJF
MAX6037CAUK30-T
-40°C to +125°C5 SOT23-5
AEJG
MAX6037AAUK33-T
-40°C to +125°C5 SOT23-5
AEJH
MAX6037BAUK33-T
-40°C to +125°C5 SOT23-5
AEJI
MAX6037CAUK33-T
-40°C to +125°C5 SOT23-5
AEJJ
MAX6037AAUK41-T
-40°C to +125°C5 SOT23-5
AEJK
MAX6037BAUK41-T
-40°C to +125°C5 SOT23-5
AEJL
MAX6037CAUK41-T
-40°C to +125°C5 SOT23-5
AEJM
M AX 6037AAU KAD J- T
-40°C to +125°C5 SOT23-5
AEIS
M AX 6037BAU KAD J- T
-40°C to +125°C5 SOT23-5
AEIT
M AX 6037C AU KAD J- T
-40°C to +125°C5 SOT23-5
AEIU
Ordering Information (continued)
MAX6037
Low-Power, Fixed and Adjustable Reference
with Shutdown in SOT23
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 ____________________ 17
©2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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.)
SOT-23 5L .EPS
E
1
1
21-0057
PACKAGE OUTLINE, SOT-23, 5L