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19-2507; Rev 2; 3/05
Ultra-Low-Power Series Voltage Reference
General Description
The MAX6129 micropower, low-dropout bandgap volt-
age 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 compa-
rable devices in an SO package. This series-mode volt-
age 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.
An initial accuracy of 0.4% and a 40ppm/°C (max) tem-
perature coefficient make the MAX6129 suitable for
precision applications. Additionally, an internal com-
pensation capacitor eliminates the need for an external
compensation capacitor and ensures stability with load
capacitances up to 10µF.
The MAX6129 provides six output voltages of 2.048V,
2.5V, 3V, 3.3V, 4.096V, and 5V. The MAX6129 is avail-
able in a 5-pin SOT23 package and in die form.
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Ultra-Low 5.25µA (max) Supply Current
4mA Output Source Current
1mA Output Sink Current
±0.4% (max) Initial Accuracy
40ppm/°C (max) Temperature Coefficient
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
MAX6129
Ordering Information
PART
MAX6129_EUK21-T
MAX6129AC/D21
MAX6129_EUK25-T
MAX6129AC/D25
MAX6129_EUK30-T
MAX6129AC/D30
MAX6129_EUK33-T
MAX6129AC/D33
MAX6129_EUK41-T
MAX6129AC/D41
MAX6129_EUK50-T
PIN-
TEMP RANGE
PACKAGE
-40°C to +85°C 5 SOT23-5
-40°C to +85°C Dice
-40°C to +85°C 5 SOT23-5
-40°C to +85°C Dice
-40°C to +85°C 5 SOT23-5
-40°C to +85°C Dice
-40°C to +85°C 5 SOT23-5
-40°C to +85°C Dice
-40°C to +85°C 5 SOT23-5
-40°C to +85°C Dice
-40°C to +85°C 5 SOT23-5
OUTPUT
VOLTAGE
(V)
2.048
2.048
2.500
2.500
3.000
3.000
3.300
3.300
4.096
4.096
5.000
Applications
Battery-Powered Systems
Handheld Instruments
Precision Power Supplies
A/D and D/A Converters
Typical Operating Circuit
V
IN
= 2.5V TO 12.6V
*
MAX6129AC/D50
-40°C to +70°C Dice
5.000
Note:
The MAX6129_EUK is available in A or B grade. Choose
the desired grade from the Selector Guide and insert the suffix
in the blank above to complete the part number.
Selector Guide appears at end of data sheet.
Pin Configuration
TOP VIEW
IN
IN
1
5
OUT
MAX6129
OUT
GND
2
MAX6129
GND
N.C.
3
4
N.C.
*
CAPACITOR IS OPTIONAL
SOT23
________________________________________________________________
Maxim Integrated Products
1
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.
Ultra-Low-Power Series Voltage Reference
MAX6129
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +13V
OUT to GND ..............-0.3V to the lower of +6V and (V
IN
+ 0.3V)
Output to GND Short-Circuit Duration........................Continuous
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
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—MAX6129_21 (V
OUT
= 2.048V)
(V
IN
= 2.5V, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient (Notes 2, 3)
Line Regulation (Note 4)
Load Regulation (Note 4)
Output Short-Circuit Current
Long-Term Stability
Thermal Hysteresis
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
INPUT
Supply Voltage Range
Supply Current
Change in Supply Current
(Note 4)
V
IN
I
IN
I
IN
/V
IN
V
IN
= 2.5V to 12.6V
1.0
2.5
12.6
5.25
1.5
V
µA
µA/V
e
OUT
f = 0.1Hz to 10Hz
f = 10Hz to 1kHz
To V
OUT
= 0.1% of final value
30
115
43
450
µV
P-P
µV
RMS
dB
µs
V
OUT
TCV
OUT
T
A
= +25°C
MAX6129A
MAX6129B
27
0.22
2.4
60
150
140
(Note 5)
I
OUT
= 0 to 4mA
I
OUT
= 0 to -1mA
MAX6129A (±0.4%)
MAX6129B (±1%)
2.0398
2.0275
2.0480
2.0480
2.0562
2.0685
40
100
200
0.7
5.5
V
ppm/°C
µV/V
µV/µA
mA
ppm
ppm
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
∆V
OUT
/∆V
IN
V
IN
= 2.5V to 12.6V
∆V
OUT
/
∆I
OUT
I
SC
∆V
OUT
/time 1000 hours at +25°C
∆V
OUT
/∆V
IN
V
IN
= 2.5V
±200mV,
f = 120Hz
t
R
2
_______________________________________________________________________________________
Ultra-Low-Power Series Voltage Reference
ELECTRICAL CHARACTERISTICS—MAX6129_25 (V
OUT
= 2.500V)
(V
IN
= 2.7V, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient (Notes 2, 3)
Line Regulation (Note 4)
Load Regulation (Note 4)
Dropout Voltage (Notes 4, 6)
Output Short-Circuit Current
Long-Term Stability
Thermal Hysteresis
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
INPUT
Supply Voltage Range
Supply Current
Change in Supply Current
(Note 4)
V
IN
I
IN
I
IN
/V
IN
V
IN
= 2.7V to 12.6V
1.0
2.7
12.6
5.75
1.5
V
µA
µA/V
e
OUT
∆V
OUT
/∆V
IN
t
R
f = 0.1Hz to 10Hz
f = 10Hz to 1kHz
V
IN
= 2.7V
±200mV,
f = 120Hz
To V
OUT
= 0.1% of final value
39
137
34
700
µV
P-P
µV
RMS
dB
ms
V
OUT
TCV
OUT
∆V
OUT
/∆V
IN
∆V
OUT
/∆I
OUT
V
IN
- V
OUT
I
SC
∆V
OUT
/time
1000 hours at +25°C
(Note 5)
T
A
= +25°C
MAX6129A
MAX6129B
V
IN
= 2.7V to 12.6V
I
OUT
= 0 to 4mA
I
OUT
= 0 to -1mA
I
OUT
= 0
I
OUT
= 4mA
30
0.1
2.5
0.3
140
60
150
140
MAX6129A (±0.4%)
MAX6129B (±1%)
2.4900
2.4750
2.5000
2.5000
2.5100
2.5250
40
100
230
0.6
6.2
100
200
V
ppm/°C
µV/V
µV/µA
mV
mA
ppm
ppm
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6129
_______________________________________________________________________________________
3
Ultra-Low-Power Series Voltage Reference
MAX6129
ELECTRICAL CHARACTERISTICS—MAX6129_30 (V
OUT
= 3.000V)
(V
IN
= 3.2V, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient (Notes 2, 3)
Line Regulation (Note 4)
Load Regulation (Note 4)
Dropout Voltage (Notes 4, 6)
Output Short-Circuit Current
Long-Term Stability
Thermal Hysteresis
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
INPUT
Supply Voltage Range
Supply Current
Change in Supply Current
(Note 4)
V
IN
I
IN
I
IN
/V
IN
V
IN
= 3.2V to 12.6V
1.0
3.2
12.6
6.75
1.5
V
µA
µA/V
e
OUT
f = 0.1Hz to 10Hz
f = 10Hz to 1kHz
To V
OUT
= 0.1% of final value
50
161
37
775
µV
P-P
µV
RMS
dB
µs
V
OUT
TCV
OUT
T
A
= +25°C
MAX6129A
MAX6129B
15
0.1
2.4
0.2
140
25
150
140
(Note 5)
MAX6129A (±0.4%)
MAX6129B (±1%)
2.9880
2.9700
3.0000
3.0000
3.0120
3.0300
40
100
250
0.6
6.5
100
200
V
ppm/°C
µV/V
µV/µA
mV
mA
ppm
ppm
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
∆V
OUT
/∆V
IN
V
IN
= 3.2V to 12.6V
I
OUT
= 0 to 4mA
∆V
OUT
/
∆I
OUT
I
OUT
= 0 to -1mA
V
IN
- V
OUT
I
SC
∆V
OUT
/time 1000 hours at +25°C
I
OUT
= 0
I
OUT
= 4mA
∆V
OUT
/∆V
IN
V
IN
= 3.2V
±200mV,
f = 120Hz
t
R
4
_______________________________________________________________________________________
MCU
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