MAX6029
Ultra-Low-Power Precision Series
Voltage Reference
General Description
Features
The MAX6029 micropower, low-dropout bandgap voltage reference combines ultra-low supply current and
low drift in a miniature 5-pin SOT23 surface-mount package that uses 70% less board space than comparable
devices in an SO package. An initial accuracy of 0.15%
and a 30ppm/°C (max) temperature coefficient make the
MAX6029 suitable for precision applications. This
series-mode voltage reference sources up to 4mA and
sinks up to 1mA of load current. A wide 2.5V to 12.6V
supply range, ultra-low 5.25µA (max) supply current,
and a low 200mV dropout voltage make these devices
ideal for battery-operated systems. Additionally, an
internal compensation capacitor eliminates the need for
an external compensation capacitor and ensures stability with load capacitances up to 10µF.
The MAX6029 provides six output voltages of 2.048V,
2.5V, 3V, 3.3V, 4.096V, and 5V. The MAX6029 is available in a 5-pin SOT23 or an 8-pin SO package and is
specified over the extended temperature range (-40°C
to +85°C).
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Applications
Ultra-Low 5.25µA (max) Supply Current
±0.15% (max) Initial Accuracy
30ppm/°C (max) Temperature Coefficient
4mA Output Source Current
1mA Output Sink Current
2.5V to 12.6V Supply Range
Low 200mV Dropout
Stable with Capacitive Loads Up to 10µF
No External Capacitors Required
Miniature 5-Pin SOT23 Package, 8-Pin SO Package
Ordering Information
PIN-PACKAGE
TOP
MARK
MAX6029EUK21+T
5 SOT23
AEHD
MAX6029EUK25+T
5 SOT23
AEHF
PART
MAX6029ESA25+
8 SO
Battery-Powered Systems
MAX6029EUK30+T
5 SOT23
AEHH
Hand-Held Instruments
MAX6029EUK33+T
5 SOT23
AEHN
Precision Power Supplies
MAX6029EUK41+T
5 SOT23
AEHJ
MAX6029ESA41+
8 SO
MAX6029EUK50+T
5 SOT23
A/D and D/A Converters
—
—
AEHL
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Selector Guide
Pin Configuration
PIN-PACKAGE
OUTPUT
VOLTAGE (V)
MAX6029EUK21
5 SOT23
2.048
2.500
PART
TOP VIEW
IN
1
5
OUT
MAX6029
GND 2
N.C. 3
4
SOT23
19-2892; Rev 3; 1/09
N.C.
MAX6029EUK25
5 SOT23
N.C.
1
8
N.C.
MAX6029ESA25
8 SO
2.500
IN
2
7
N.C.
MAX6029EUK30
5 SOT23
3.000
N.C.
3
6
OUT
MAX6029EUK33
5 SOT23
3.300
MAX6029EUK41
5 SOT23
4.096
MAX6029ESA41
8 SO
4.096
MAX6029EUK50
5 SOT23
5.000
MAX6029
GND 4
5
SO
N.C.
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Absolute Maximum Ratings
IN to GND ...............................................................-0.3V to +13V
OUT to GND ..............-0.3V to the lower of +6V and (VIN + 0.3V)
Output to GND Short-Circuit Duration........................Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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—MAX6029_21 (VOUT = 2.048V)
(VIN = 2.5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.0449
2.0480
2.0511
V
30
ppm/°C
µV/V
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Output Short-Circuit Current
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
ΔVOUT/ΔVIN VIN = 2.5V to 12.6V
ΔVOUT/
ΔIOUT
27
200
IOUT = 0 to 4mA
0.22
0.7
IOUT = 0 to -1mA
2.4
5.5
ISC
µV/µA
60
mA
Long-Term Stability
ΔVOUT/time 1000 hours at +25°C
150
ppm
Thermal Hysteresis
(Note 4)
140
ppm
f = 0.1Hz to 10Hz
30
µVP-P
f = 10Hz to 1kHz
115
µVRMS
ΔVOUT/ΔVIN VIN = 2.5V ±200mV, f = 120Hz
43
dB
450
µs
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
eOUT
tR
To VOUT = 0.1% of final value
INPUT
Supply Voltage Range
VIN
Supply Current
IIN
Change in Supply Current
www.maximintegrated.com
IIN/VIN
2.5
VIN = 2.5V to 12.6V
12.6
V
5.25
µA
1.5
µA/V
Maxim Integrated | 2
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Electrical Characteristics—MAX6029_25 (VOUT = 2.500V)
(VIN = 2.7V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
MAX6029EUK
2.4963
2.5000
2.5038
MAX6029ESA
2.495
2.500
2.505
UNITS
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
Line Regulation
ΔVOUT/ΔVIN
Load Regulation
ΔVOUT/ΔIOUT
Dropout Voltage (Note 5)
Output Short-Circuit Current
Long-Term Stability
VIN - VOUT
Thermal Hysteresis
30
ppm/°C
µV/V
VIN = 2.7V to 12.6V
30
230
IOUT = 0 to 4mA
0.1
0.6
IOUT = 0 to -1mA
2.5
6.2
IOUT = 0
100
IOUT = 4mA
200
ISC
ΔVOUT/time
V
µV/µA
mV
60
mA
1000 hours at +25°C
150
ppm
(Note 4)
140
ppm
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
f = 0.1Hz to 10Hz
39
µVP-P
f = 10Hz to 1kHz
137
µVRMS
ΔVOUT/ΔVIN
VIN = 2.7V ±200mV, f = 120Hz
34
dB
tR
To VOUT = 0.1% of final value
700
ms
eOUT
INPUT
Supply Voltage Range
Supply Current
Change in Supply Current
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VIN
2.7
IIN
IIN/VIN
VIN = 2.7V to 12.6V
12.6
V
5.75
µA
1.5
µA/V
Maxim Integrated | 3
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Electrical Characteristics—MAX6029_30 (VOUT = 3.000V)
(VIN = 3.2V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.9955
3.0000
3.0045
V
30
ppm/°C
µV/V
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage (Note 5)
Output Short-Circuit Current
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
ΔVOUT/ΔVIN VIN = 3.2V to 12.6V
ΔVOUT/
ΔIOUT
VIN - VOUT
15
250
IOUT = 0 to 4mA
0.1
0.6
IOUT = 0 to -1mA
2.4
6.5
IOUT = 0
100
IOUT = 4mA
200
ISC
60
µV/µA
mV
mA
Long-Term Stability
ΔVOUT/time 1000 hours at +25°C
150
ppm
Thermal Hysteresis
(Note 4)
140
ppm
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
f = 0.1Hz to 10Hz
39
µVP-P
f = 10Hz to 1kHz
161
µVRMS
ΔVOUT/ΔVIN VIN = 3.2V ±200mV, f = 120Hz
tR
To VOUT = 0.1% of final value
37
dB
775
µs
eOUT
INPUT
Supply Voltage Range
VIN
Supply Current
IIN
Change in Supply Current
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IIN/VIN
3.2
VIN = 3.2V to 12.6V
12.6
V
6.75
µA
1.5
µA/V
Maxim Integrated | 4
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Electrical Characteristics—MAX6029_33 (VOUT = 3.000V)
(VIN = 3.5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage (Note 5)
Output Short-Circuit Current
Long-Term Stability
SYMBOL
CONDITIONS
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
ΔVOUT/ΔVIN
ΔVOUT/ΔIOUT
VIN - VOUT
MIN
TYP
MAX
UNITS
3.2951
3.3000
3.3050
V
30
ppm/°C
µV/V
VIN = 3.5V to 12.6V
30
270
IOUT = 0 to 4mA
0.1
0.6
IOUT = 0 to -1mA
2.4
7
IOUT = 0
100
IOUT = 4mA
200
ISC
ΔVOUT/time
Thermal Hysteresis
60
µV/µA
mV
mA
1000 hours at +25°C
150
ppm
(Note 4)
140
ppm
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
f = 0.1Hz to 10Hz
56
µVP-P
f = 10Hz to 1kHz
174
µVRMS
ΔVOUT/ΔVIN
VIN = 3.5V ±200mV, f = 120Hz
38
dB
tR
To VOUT = 0.1% of final value
1
ms
eOUT
INPUT
Supply Voltage Range
VIN
Supply Current
IIN
Change in Supply Current
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IIN/VIN
3.5
VIN = 3.5V to 12.6V
12.6
V
7.25
µA
1.5
µA/V
Maxim Integrated | 5
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Electrical Characteristics—MAX6029_41 (VOUT = 4.096V)
(VIN = 4.3V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
4.0899
4.088
4.0960
4.1021
4.096
4.104
UNITS
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage (Note 5)
Output Short-Circuit Current
Long-Term Stability
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
ΔVOUT/ΔVIN
ΔVOUT/ΔIOUT
VIN - VOUT
MAX6029EUK
MAX6029ESA
ΔVOUT/time
Thermal Hysteresis
30
ppm/°C
µV/V
VIN = 4.3V to 12.6V
30
310
IOUT = 0 to 4mA
0.1
0.6
IOUT = 0 to -1mA
2.5
8.5
IOUT = 0
100
IOUT = 4mA
200
ISC
V
60
µV/µA
mV
mA
1000 hours at +25°C
150
ppm
(Note 4)
140
ppm
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
f = 0.1Hz to 10Hz
72
µVP-P
f = 10Hz to 1kHz
210
µVRMS
ΔVOUT/ΔVIN
VIN = 4.3V ±200mV, f = 120Hz
36
dB
tR
To VOUT = 0.1% of final value
1.2
ms
eOUT
INPUT
Supply Voltage Range
VIN
Supply Current
IIN
Change in Supply Current
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IIN/VIN
4.3
VIN = 4.3V to 12.6V
12.6
V
8.75
µA
1.5
µA/V
Maxim Integrated | 6
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Electrical Characteristics—MAX6029_50 (VOUT = 5.000V)
(VIN = 5.2V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.9925
5.0000
5.0075
V
30
ppm/°C
µV/V
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage (Note 5)
Output Short-Circuit Current
VOUT
TA = +25°C
TCVOUT
(Notes 2, 3)
ΔVOUT/ΔVIN VIN = 5.2V to 12.6V
ΔVOUT/
ΔIOUT
VIN - VOUT
34
375
IOUT = 0 to 4mA
0.3
0.8
IOUT = 0 to -1mA
3.3
9
IOUT = 0
100
IOUT = 4mA
200
ISC
60
µV/µA
mV
mA
Long-Term Stability
ΔVOUT/time 1000 hours at +25°C
150
ppm
Thermal Hysteresis
(Note 4)
140
ppm
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
f = 0.1Hz to 10Hz
90
µVP-P
f = 10Hz to 1kHz
245
µVRMS
ΔVOUT/ΔVIN VIN = 5.2V ±200mV, f = 120Hz
tR
To VOUT = 0.1% of final value
38
dB
1.4
ms
eOUT
INPUT
Supply Voltage Range
VIN
Supply Current
IIN
Change in Supply Current
IIN/VIN
5.2
VIN = 5.2V to 12.6V
12.6
V
10.5
µA
1.5
µA/V
MAX6029 is 100% production tested at TA = +25°C and is guaranteed by design for TA = TMIN to TMAX as specified.
Temperature coefficient is defined by box method: (VMAX - VMIN)/(ΔT ✕ V+25°C).
Not production tested. Guaranteed by design.
Thermal hysteresis is defined as the change in TA = +25°C output voltage before and after temperature cycling of the
device (from TA = TMIN to TMAX). Initial measurement at TA = +25°C is followed by temperature cycling the device to TA =
+85°C then to TA = -40°C and another measurement at TA = +25°C is compared to the original measurement at TA = +25°C.
Note 5: Dropout voltage is the minimum input voltage at which VOUT changes by 0.1% from VOUT at rated VIN and is guaranteed by
Load Regulation Test.
Note 1:
Note 2:
Note 3:
Note 4:
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Maxim Integrated | 7
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Characteristics
2.999
2.997
2.995
3 TYPICAL UNITS
5.004
5.002
OUTPUT VOLTAGE (V)
2.044
3 TYPICAL UNITS
3.001
OUTPUT VOLTAGE (V)
2.046
5.006
MAX6029 toc02
3 TYPICAL UNITS
2.048
OUTPUT VOLTAGE (V)
3.003
MAX6029 toc01
2.050
MAX6029 toc03
(VIN = 2.5V for MAX6029EUK21, VIN = 3.2V for MAX6029EUK30, and VIN = 5.2V for MAX6029EUK50, IOUT = 0, TA = +25°C, unless
otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 5V)
(VOUT = 2.048V)
(VOUT = 3V)
5.000
4.998
4.996
4.994
4.992
2.042
2.993
4.990
2.040
-15
10
35
85
60
-40
-15
10
-40
85
60
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT vs. INPUT VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 2.048V)
8
VOUT = 3V
VOUT = 2.048V
4
5.5
VOUT = 3V
5.0
4.5
4.0
VOUT = 2.048V
3.5
2
VOUT = 5V
0.14
0.10
0.08
0.06
0.02
0
2.5
0 1 2 3 4 5 6 7 8 9 10 11 12 13
0.12
0.04
3.0
0
MAX6029 toc06
VOUT = 5V
DROPOUT VOLTAGE (V)
SUPPLY CURRENT (μA)
10
6
6.5
6.0
0.16
MAX6029 toc05
7.0
MAX6029 toc04
12
-40
-15
10
35
0
85
60
1
2
3
4
5
INPUT VOLTAGE (V)
TEMPERATURE (°C)
SOURCE CURRENT (mA)
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 3V)
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 5V)
LOAD REGULATION
(VOUT = 2.048V)
DROPOUT VOLTAGE (V)
0.08
0.07
0.06
0.05
0.04
0.03
0.07
0.06
0.05
0.04
0.03
2.0520
2.0515
2.0510
2.0505
2.0500
2.0495
2.0490
2.0485
0.02
2.0480
0.01
0.01
2.0475
0
0
0.02
0
1
2
3
4
5
SOURCE CURRENT (mA)
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6
7
7
6
MAX6029 toc09
0.09
0.08
OUTPUT VOLTAGE (V)
0.10
MAX6029 toc08
0.09
MAX6029 toc07
0.11
DROPOUT VOLTAGE (V)
35
TEMPERATURE (°C)
14
SUPPLY CURRENT (μA)
4.988
2.991
-40
2.0470
0
1
2
3
4
5
SOURCE CURRENT (mA)
6
7
-2
-1
0
1
2
3
4
5
6
7
OUTPUT CURRENT (mA)
Maxim Integrated | 8
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Characteristics (continued)
(VIN = 2.5V for MAX6029EUK21, VIN = 3.2V for MAX6029EUK30, and VIN = 5.2V for MAX6029EUK50, IOUT = 0, TA = +25°C, unless
otherwise noted.)
2.04784
2.04782
2.04780
2.04778
3.0040
3.0035
3.0030
3.0025
2.04776
3.0020
2.04774
3.0015
2.04772
5.5
7.0
8.5
10.0
11.5
13.0
-1
0
1
2
3
4
5
OUTPUT CURRENT (mA)
LOAD REGULATION
(VOUT = 5V)
LINE REGULATION
(VOUT = 5V)
5.0030
5.0025
5.0020
5.00072
5.00070
5.0010
5.00066
0
1
2
3
4
5
6
9
10 11 12 13
0
-10
-30
-60
5
7
6
7
8
9
10
11
12
0.1
13
10
1000
100
LINE-TRANSIENT RESPONSE
(VOUT = 2.048V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 5V)
MAX6029 toc18
MAX6029 toc17
0
MAX6029 toc16
1
FREQUENCY (kHz)
INPUT VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 3V)
-10
8
-50
OUTPUT CURRENT (mA)
0
7
-40
5.00064
-1
6
-20
5.00074
5.00068
-2
5
5.00076
5.0015
5.0005
4
POWER-SUPPLY REJECTION RATIO vs.
FREQUENCY (VOUT = 2.048V)
PSRR (dB)
5.0035
3
7
INPUT VOLTAGE (V)
5.00078
OUTPUT VOLTAGE (V)
5.0040
6
5.00080
MAX6029 toc13
5.0045
OUTPUT VOLTAGE (V)
3.00155
-2
INPUT VOLTAGE (V)
5.0050
3.00165
MAX6029 toc14
4.0
3.00170
3.00160
3.0010
2.5
3.00175
MAX6029 toc15
2.04786
3.00180
MAX6029 toc11
3.0045
OUTPUT VOLTAGE (V)
2.04788
3.0050
OUTPUT VOLTAGE (V)
2.04790
OUTPUT VOLTAGE (V)
3.0055
MAX6029 toc10
2.04792
-5
-10
3V
VIN
200mV/div
AC-COUPLED
-15
PSRR (dB)
-20
PSRR (dB)
LINE REGULATION
(VOUT = 3V)
LOAD REGULATION
(VOUT = 3V)
MAX6029 toc12
LINE REGULATION
(VOUT = 2.048V)
-30
-40
2.5V
-20
-25
-30
-35
VOUT
200mV/div
AC-COUPLED
2.048V
-40
-50
-45
-60
-50
0.1
1
10
FREQUENCY (kHz)
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100
1000
0.1
1
10
100
1000
200μs/div
FREQUENCY (kHz)
Maxim Integrated | 9
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Characteristics (continued)
(VIN = 2.5V for MAX6029EUK21, VIN = 3.2V for MAX6029EUK30, and VIN = 5.2V for MAX6029EUK50, IOUT = 0, TA = +25°C, unless
otherwise noted.)
LINE-TRANSIENT RESPONSE
(VOUT = 3V)
LINE-TRANSIENT RESPONSE
(VOUT = 5V)
MAX6029 toc19
3.7V
MAX61029 toc20
VIN
200mV/div
AC-COUPLED
3.2V
5.7V
VIN
200mV/div
AC-COUPLED
5.2V
VOUT
100mV/div
AC-COUPLED
5V
VOUT
200mV/div
AC-COUPLED
3V
200μs/div
200μs/div
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 2.048V)
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 2.048V)
MAX6029 toc21
MAX6029 toc22
COUT = 0
COUT = 0
IOUT
10mA/div
4mA
0
VOUT
500mV/div
AC-COUPLED
2.048V
IOUT
2mA/div
0
-1mA
VOUT
500mV/div
AC-COUPLED
2.048V
100μs/div
1ms/div
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 2.048V)
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 2.048V)
MAX6029 toc23
MAX6029 toc24
COUT = 1μF
COUT = 1μF
IOUT
10mA/div
4mA
0
VOUT
500mV/div
AC-COUPLED
2.048V
400μs/div
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0
-1mA
IOUT
2mA/div
VOUT
500mV/div
AC-COUPLED
2.048V
1ms/div
Maxim Integrated | 10
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Characteristics (continued)
(VIN = 2.5V for MAX6029EUK21, VIN = 3.2V for MAX6029EUK30, and VIN = 5.2V for MAX6029EUK50, IOUT = 0, TA = +25°C, unless
otherwise noted.)
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 5V)
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 5V)
MAX6029 toc25
MAX6029 toc26
COUT = 0
COUT = 0
IOUT
10mA/div
4mA
0
0
IOUT
1mA/div
-1mA
VOUT
500mV/div
AC-COUPLED
5V
VOUT
1V/div
AC-COUPLED
5V
400μs/div
2ms/div
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 5V)
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 5V)
6029 toc27
MAX6029 toc28
COUT = 1μF
COUT = 1μF
IOUT
10mA/div
4mA
0
0
IOUT
1mA/div
-1mA
VOUT
200mV/div
AC-COUPLED
6V
VOUT
1V/div
AC-COUPLED
5V
400μs/div
2ms/div
TURN-ON TRANSIENT
(VOUT = 2.048V)
TURN-ON TRANSIENT
(VOUT = 3V)
MAX6029 toc29
2.5V
MAX6029 toc30
VIN
1V/div
3.2V
VIN
2V/div
0
0
3V
2.048V
VOUT
1V/div
0
0
200μs/div
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VOUT
1V/div
200μs/div
Maxim Integrated | 11
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Characteristics (continued)
(VIN = 2.5V for MAX6029EUK21, VIN = 3.2V for MAX6029EUK30, and VIN = 5.2V for MAX6029EUK50, IOUT = 0, TA = +25°C, unless
otherwise noted.)
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 2.048V)
TURN-ON TRANSIENT
(VOUT = 5V)
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 3V)
MAX6029 toc32
MAX6029 toc31
MAX6029 toc33
5.2V
VIN
2V/div
VOUT
10μV/div
VOUT
10μV/div
0
5V
VOUT
2V/div
0
1s/div
400μs/div
1s/div
NOISE vs. FREQUENCY
(VOUT = 2.048V)
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 5V)
MAX6029 toc34
MAX6029 toc35
4.0
VOUT
20μV/div
NOISE (μVRMS/√Hz)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
1s/div
10
20
30
40
50
FREQUENCY (kHz)
NOISE vs. FREQUENCY
(VOUT = 5V)
MAX6029 toc37
20
MAX6029 toc36
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
18
16
NOISE (μVRMS/√Hz)
NOISE (μVRMS/√Hz)
NOISE vs. FREQUENCY
(VOUT = 3V)
14
12
10
8
6
4
2
0
0
10
20
30
FREQUENCY (kHz)
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40
50
0
10
20
30
40
50
FREQUENCY (kHz)
Maxim Integrated | 12
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Pin Description
PIN
NAME
FUNCTION
SOT23
SO
1
2
IN
2
4
GND
Ground
3, 4
1, 3, 5, 7,
8
N.C.
No Connection. Leave
unconnected or connect to
ground.
5
6
OUT
Reference Output
Positive Voltage Supply
MAX6029 family draws load current from the input voltage source only when required, so supply current is not
wasted and efficiency is maximized at all input voltages. This improved efficiency reduces power dissipation and extends battery life.
Output Thermal Hysteresis
Output thermal hysteresis is the change of the output
voltage at TA = +25°C before and after the device is
cycled over its entire operating temperature range.
Hysteresis is caused by differential package stress
appearing across the device.
Temperature Coefficient vs. Operating
Temperature Range for a 1LSB
Maximum Error
Applications Information
Input Bypassing
The MAX6029 does not require an input bypass capacitor. For improved transient performance, bypass the
input to ground with a 0.1µF ceramic capacitor. Place
the capacitor as close to IN as possible.
Load Capacitance
The MAX6029 does not require an output capacitor for
stability. The MAX6029 is stable driving capacitive
loads from 0 to 100pF and 0.1µF to 10µF when sourcing current and from 0 to 0.4µF when sinking current. In
applications where the load or the supply can experience step changes, an output capacitor reduces the
amount of overshoot (undershoot) and improves the circuit’s transient response. Many applications do not
require an external capacitor, and the MAX6029 offers
a significant advantage in applications where board
space is critical.
Supply Current
The quiescent supply current of the series-mode
MAX6029 is very small, 5.25µA (max), and is very stable against changes in the supply voltage with only
1.5µA/V (max) variation with supply voltage. The
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 through the operating temperature range. Figure 1
shows the maximum allowable reference voltage 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 reference-voltage temperature coefficient as the only parameter affecting accuracy.
In reality, the absolute static accuracy of a data converter is dependent on the combination of many parameters
such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltage reference
changes.
Turn-On Time
These devices turn on and settle to within 0.1% of their
final value in less than 1ms. The turn-on time increases
when heavily loaded and operating close to dropout.
10,000
1000
100
TEMPERATURE
COEFFICIENT
(ppm/°C)
8-BIT
10
10-BIT
12-BIT
1
14-BIT
16-BIT
0.1
18-BIT
0.01
1
10
OPERATING TEMPERATURE RANGE (TMAX - TMIN) (°C)
20-BIT
100
Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
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Maxim Integrated | 13
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Typical Operating Circuit
VIN = 2.5V TO 12.6V
Chip Information
PROCESS: BiCMOS
*
Package Information
IN
MAX6029
OUT
GND
*CAPACITOR IS OPTIONAL.
www.maximintegrated.com
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE NO.
LAND
PATTERN NO.
5 SOT23
U5+1
21-0057
90-0174
8 SO
S8+2
21-0041
90-0096
Maxim Integrated | 14
Ultra-Low-Power Precision Series
Voltage Reference
MAX6029
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/03
1
8/06
2
11/06
3
1/09
DESCRIPTION
Initial release
Added SO package
Updated voltage output limits
Added lead-free notation to Ordering Information
PAGES
CHANGED
—
1, 2, 14, 15
3, 6
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2009 Maxim Integrated Products, Inc. | 15
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