MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
19-2892; Rev 3; 1/09
General Description
The MAX6029 micropower, low-dropout bandgap volt-
age reference combines ultra-low supply current and
low drift in a miniature 5-pin SOT23 surface-mount pack-
age 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 stabili-
ty 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 avail-
able in a 5-pin SOT23 or an 8-pin SO package and is
specified over the extended temperature range (-40°C
to +85°C).
Applications
Battery-Powered Systems
Hand-Held Instruments
Precision Power Supplies
A/D and D/A Converters
Features
•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
GND
N.C.N.C.
1 5 OUTIN
MAX6029
SOT23
TOP VIEW
2
34
OUT
N.C.GND
1
2
8
7
N.C.
N.C.IN
N.C.
N.C.
SO
3
4
6
5
MAX6029
Pin Configuration
Ordering Information
PART PIN-PACKAGE TOP
MARK
MAX6029EUK21+T 5 SOT23 AEHD
MAX6029EUK25+T 5 SOT23 AEHF
MAX6029ESA25+ 8 SO —
MAX6029EUK30+T 5 SOT23 AEHH
MAX6029EUK33+T 5 SOT23 AEHN
MAX6029EUK41+T 5 SOT23 AEHJ
MAX6029ESA41+ 8 SO —
MAX6029EUK50+T 5 SOT23 AEHL
Selector Guide
PART PIN-PACKAGE
OUTPUT
VOLTAGE (V)
MAX6029EUK21 5 SOT23 2.048
MAX6029EUK25 5 SOT23 2.500
MAX6029ESA25 8 SO 2.500
MAX6029EUK30 5 SOT23 3.000
MAX6029EUK33 5 SOT23 3.300
MAX6029EUK41 5 SOT23 4.096
MAX6029ESA41 8 SO 4.096
MAX6029EUK50 5 SOT23 5.000
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
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 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
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
OUTPUT
Output Voltage VOUT TA = +25°C 2.0449 2.0480 2.0511 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 2.5V to 12.6V 27 200 µV/V
IOUT = 0 to 4mA 0.22 0.7
Load Regulation ΔVOUT/
ΔIOUT IOUT = 0 to -1mA 2.4 5.5 µV/µA
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 30 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 115 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 2.5V ±200mV, f = 120Hz 43 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 450 µs
INPUT
Supply Voltage Range VIN 2.5 12.6 V
Supply Current IIN 5.25 µA
Change in Supply Current IIN/VIN VIN = 2.5V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 3www.maximintegrated.com
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 UNITS
OUTPUT
MAX6029EUK 2.4963 2.5000 2.5038
Output Voltage VOUT TA = +25°CMAX6029ESA 2.495 2.500 2.505 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 2.7V to 12.6V 30 230 µV/V
IOUT = 0 to 4mA 0.1 0.6
Load Regulation ΔVOUT/ΔIOUT IOUT = 0 to -1mA 2.5 6.2 µV/µA
IOUT = 0 100
Dropout Voltage (Note 5) VIN - VOUT IOUT = 4mA 200 mV
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 39 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 137 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 2.7V ±200mV, f = 120Hz 34 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 700 ms
INPUT
Supply Voltage Range VIN 2.7 12.6 V
Supply Current IIN 5.75 µA
Change in Supply Current IIN/VIN VIN = 2.7V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 4www.maximintegrated.com
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
OUTPUT
Output Voltage VOUT TA = +25°C 2.9955 3.0000 3.0045 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 3.2V to 12.6V 15 250 µV/V
IOUT = 0 to 4mA 0.1 0.6
Load Regulation ΔVOUT/
ΔIOUT IOUT = 0 to -1mA 2.4 6.5 µV/µA
IOUT = 0 100
Dropout Voltage (Note 5) VIN - VOUT IOUT = 4mA 200 mV
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 39 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 161 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 3.2V ±200mV, f = 120Hz 37 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 775 µs
INPUT
Supply Voltage Range VIN 3.2 12.6 V
Supply Current IIN 6.75 µA
Change in Supply Current IIN/VIN VIN = 3.2V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 5www.maximintegrated.com
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 SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 3.2951 3.3000 3.3050 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 3.5V to 12.6V 30 270 µV/V
IOUT = 0 to 4mA 0.1 0.6
Load Regulation ΔVOUT/ΔIOUT IOUT = 0 to -1mA 2.4 7 µV/µA
IOUT = 0 100
Dropout Voltage (Note 5) VIN - VOUT IOUT = 4mA 200 mV
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 56 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 174 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 3.5V ±200mV, f = 120Hz 38 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 1 ms
INPUT
Supply Voltage Range VIN 3.5 12.6 V
Supply Current IIN 7.25 µA
Change in Supply Current IIN/VIN VIN = 3.5V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 6www.maximintegrated.com
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 UNITS
OUTPUT
MAX6029EUK 4.0899 4.0960 4.1021
Output Voltage VOUT TA = +25°CMAX6029ESA 4.088 4.096 4.104 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 4.3V to 12.6V 30 310 µV/V
IOUT = 0 to 4mA 0.1 0.6
Load Regulation ΔVOUT/ΔIOUT IOUT = 0 to -1mA 2.5 8.5 µV/µA
IOUT = 0 100
Dropout Voltage (Note 5) VIN - VOUT IOUT = 4mA 200 mV
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 72 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 210 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 4.3V ±200mV, f = 120Hz 36 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 1.2 ms
INPUT
Supply Voltage Range VIN 4.3 12.6 V
Supply Current IIN 8.75 µA
Change in Supply Current IIN/VIN VIN = 4.3V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 7www.maximintegrated.com
Note 1: MAX6029 is 100% production tested at TA= +25°C and is guaranteed by design for TA= TMIN to TMAX as specified.
Note 2: Temperature coefficient is defined by box method: (VMAX - VMIN)/(ΔT ✕V+25°C).
Note 3: Not production tested. Guaranteed by design.
Note 4: 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.
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
OUTPUT
Output Voltage VOUT TA = +25°C 4.9925 5.0000 5.0075 V
Output Voltage Temperature
Coefficient TCVOUT (Notes 2, 3) 30 ppm/°C
Line Regulation ΔVOUT/ΔVIN VIN = 5.2V to 12.6V 34 375 µV/V
IOUT = 0 to 4mA 0.3 0.8
Load Regulation ΔVOUT/
ΔIOUT IOUT = 0 to -1mA 3.3 9 µV/µA
IOUT = 0 100
Dropout Voltage (Note 5) VIN - VOUT IOUT = 4mA 200 mV
Output Short-Circuit Current ISC 60 mA
Long-Term Stability ΔVOUT/time 1000 hours at +25°C 150 ppm
Thermal Hysteresis (Note 4) 140 ppm
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz 90 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 245 µVRMS
Ripple Rejection ΔVOUT/ΔVIN VIN = 5.2V ±200mV, f = 120Hz 38 dB
Turn-On Settling Time tRTo VOUT = 0.1% of final value 1.4 ms
INPUT
Supply Voltage Range VIN 5.2 12.6 V
Supply Current IIN 10.5 µA
Change in Supply Current IIN/VIN VIN = 5.2V to 12.6V 1.5 µA/V
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 8www.maximintegrated.com
Typical Operating Characteristics
(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
(VOUT = 2.048V)
MAX6029 toc01
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
2.042
2.044
2.046
2.048
2.050
2.040
-40 85
3 TYPICAL UNITS
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 3V)
MAX6029 toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
2.993
2.995
2.997
2.999
3.001
3.003
2.991
-40 85
3 TYPICAL UNITS
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 5V)
MAX6029 toc03
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
4.990
4.992
4.994
4.996
4.998
5.000
5.002
5.004
5.006
4.988
603510-15-40 85
3 TYPICAL UNITS
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6029 toc04
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
121110987654321
2
4
6
8
10
12
14
0
013
VOUT = 3V
VOUT = 5V
VOUT = 2.048V
SUPPLY CURRENT vs. TEMPERATURE
MAX6029 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
603510-15
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
2.5
-40 85
VOUT = 3V
VOUT = 5V
VOUT = 2.048V
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 2.048V)
MAX6029 toc06
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (V)
651 2 3 4
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0
07
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 3V)
MAX6029 toc07
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (V)
653 421
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0
07
DROPOUT VOLTAGE vs. SOURCE CURRENT
(VOUT = 5V)
MAX6029 toc08
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (V)
653 421
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0
07
LOAD REGULATION
(VOUT = 2.048V)
MAX6029 toc09
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
653 40 1 2-1
2.0475
2.0480
2.0485
2.0490
2.0495
2.0500
2.0505
2.0510
2.0515
2.0520
2.0470
-2 7
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 9www.maximintegrated.com
LINE REGULATION
(VOUT = 2.048V)
MAX6029 toc10
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
11.510.07.0 8.55.54.0
2.04774
2.04776
2.04778
2.04780
2.04782
2.04784
2.04786
2.04788
2.04790
2.04792
2.04772
2.5 13.0
LOAD REGULATION
(VOUT = 3V)
MAX6029 toc11
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
653 40 1 2-1
3.0015
3.0020
3.0025
3.0030
3.0035
3.0040
3.0045
3.0050
3.0055
3.0010
-2 7
LOAD REGULATION
(VOUT = 5V)
MAX6029 toc13
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
653 40 1 2-1
5.0015
5.0020
5.0025
5.0030
5.0035
5.0040
5.0045
5.0050
5.0005
5.0010
-2 7
LINE REGULATION
(VOUT = 5V)
MAX6029 toc14
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
12116 7 8 9 10
5.00066
5.00068
5.00070
5.00072
5.00074
5.00076
5.00078
5.00080
5.00064
513
POWER-SUPPLY REJECTION RATIO vs.
FREQUENCY (VOUT = 2.048V)
MAX6029 toc15
FREQUENCY (kHz)
PSRR (dB)
100101
-50
-40
-30
-20
-10
0
-60
0.1 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 3V)
MAX6029 toc16
FREQUENCY (kHz)
PSRR (dB)
100101
-50
-40
-30
-20
-10
0
-60
0.1 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 5V)
MAX6029 toc17
FREQUENCY (kHz)
PSRR (dB)
100101
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50
0.1 1000
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 = 2.048V)
MAX6029 toc18
200μs/div
3V
2.5V
2.048V
VIN
200mV/div
AC-COUPLED
VOUT
200mV/div
AC-COUPLED
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 10www.maximintegrated.com
LINE-TRANSIENT RESPONSE
(VOUT = 3V)
MAX6029 toc19
200μs/div
3.7V
3.2V
3V
VIN
200mV/div
AC-COUPLED
VOUT
200mV/div
AC-COUPLED
LINE-TRANSIENT RESPONSE
(VOUT = 5V)
MAX61029 toc20
200μs/div
5.7V
5.2V
5V
VIN
200mV/div
AC-COUPLED
VOUT
100mV/div
AC-COUPLED
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 2.048V)
MAX6029 toc21
100μs/div
4mA
2.048V
IOUT
10mA/div
VOUT
500mV/div
AC-COUPLED
COUT = 0
0
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 2.048V)
MAX6029 toc22
1ms/div
0
-1mA
2.048V
IOUT
2mA/div
VOUT
500mV/div
AC-COUPLED
COUT = 0
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 2.048V)
MAX6029 toc23
400μs/div
4mA
2.048V
IOUT
10mA/div
VOUT
500mV/div
AC-COUPLED
COUT = 1μF
0
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 2.048V)
MAX6029 toc24
1ms/div
0
-1mA
2.048V
IOUT
2mA/div
VOUT
500mV/div
AC-COUPLED
COUT = 1μF
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.)
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 11www.maximintegrated.com
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 5V)
MAX6029 toc28
2ms/div
0
-1mA
5V
IOUT
1mA/div
VOUT
1V/div
AC-COUPLED
COUT = 1μF
TURN-ON TRANSIENT
(VOUT = 2.048V)
MAX6029 toc29
200μs/div
2.5V
2.048V
VIN
1V/div
VOUT
1V/div
0
0
TURN-ON TRANSIENT
(VOUT = 3V)
MAX6029 toc30
200μs/div
3.2V
3V
VIN
2V/div
VOUT
1V/div
0
0
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 5V)
MAX6029 toc25
400μs/div
4mA
5V
IOUT
10mA/div
VOUT
500mV/div
AC-COUPLED
COUT = 0
0
LOAD-TRANSIENT RESPONSE
(SINKING, VOUT = 5V)
MAX6029 toc26
2ms/div
0
-1mA
5V
IOUT
1mA/div
VOUT
1V/div
AC-COUPLED
COUT = 0
LOAD-TRANSIENT RESPONSE
(SOURCING, VOUT = 5V)
6029 toc27
400μs/div
4mA
6V
IOUT
10mA/div
VOUT
200mV/div
AC-COUPLED
COUT = 1μF
0
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.)
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 12www.maximintegrated.com
NOISE vs. FREQUENCY
(VOUT = 5V)
MAX6029 toc37
FREQUENCY (kHz)
NOISE (μVRMS/√Hz)
40302010
2
4
6
8
10
12
14
16
18
20
0
050
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 5V)
MAX6029 toc34
1s/div
VOUT
20μV/div
NOISE vs. FREQUENCY
(VOUT = 2.048V)
MAX6029 toc35
FREQUENCY (kHz)
NOISE (μVRMS/√Hz)
403010 20
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
050
NOISE vs. FREQUENCY
(VOUT = 3V)
MAX6029 toc36
FREQUENCY (kHz)
NOISE (μVRMS/√Hz)
40302010
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
0
050
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 2.048V)
MAX6029 toc32
1s/div
VOUT
10μV/div
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 3V)
MAX6029 toc33
1s/div
VOUT
10μV/div
TURN-ON TRANSIENT
(VOUT = 5V)
MAX6029 toc31
400μs/div
5.2V
5V
VIN
2V/div
VOUT
2V/div
0
0
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.)
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 13www.maximintegrated.com
Applications Information
Input Bypassing
The MAX6029 does not require an input bypass capac-
itor. 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 sourc-
ing current and from 0 to 0.4µF when sinking current. In
applications where the load or the supply can experi-
ence step changes, an output capacitor reduces the
amount of overshoot (undershoot) and improves the cir-
cuit’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 sta-
ble against changes in the supply voltage with only
1.5µA/V (max) variation with supply voltage. The
MAX6029 family draws load current from the input volt-
age source only when required, so supply current is not
wasted and efficiency is maximized at all input volt-
ages. This improved efficiency reduces power dissipa-
tion 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
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 temper-
ature 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 parame-
ter. The graph assumes the reference-voltage tempera-
ture coefficient as the only parameter affecting accuracy.
In reality, the absolute static accuracy of a data convert-
er is dependent on the combination of many parameters
such as integral nonlinearity, differential nonlinearity, off-
set 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.
PIN
SOT23 SO NAME FUNCTION
1 2 IN Positive Voltage Supply
2 4 GND Ground
3, 4 1, 3, 5, 7,
8N.C.
No Connection. Leave
unconnected or connect to
ground.
5 6 OUT Reference Output
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 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
Pin Description
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
Maxim Integrated | 14www.maximintegrated.com
OUT
GND
IN
MAX6029
VIN = 2.5V TO 12.6V
*CAPACITOR IS OPTIONAL.
*
Typical Operating Circuit Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns (foot-
prints), 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 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
MAX6029 Ultra-Low-Power Precision Series
Voltage Reference
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.
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 7/03 Initial release —
1 8/06 Added SO package 1, 2, 14, 15
2 11/06 Updated voltage output limits 3, 6
3 1/09 Added lead-free notation to Ordering Information 1
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