The MAX6133 high-precision, low-power, low-dropout
voltage reference features a low 3ppm/°C (max) temperature coefficient and a low dropout voltage (200mV,
max). This series-mode device features bandgap technology for low-noise performance and excellent accuracy. Load regulation specifications are guaranteed for
source currents up to 15mA. The laser-trimmed, highstability thin-film resistors, together with post-package
trimming, guarantee an excellent initial accuracy specification (0.04%, max). The MAX6133 is a series voltage
reference and consumes only 40µA of supply current
(virtually independent of supply voltage). Series-mode
references save system power and use minimal external
components compared to 2-terminal shunt references.
The MAX6133 is available in 8-pin µMAX and SO packages. The unique blend of tiny packaging and excellent
precision performance make these parts ideally suited
for portable and communication applications.
Applications
Precision Regulators
A/D and D/A Converters
Power Supplies
High-Accuracy Industrial and Process Control
Hand-Held Instruments
. Typical values are at TA = +25°C, unless otherwise noted.)
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.
Voltage (with Respect to GND)
IN ........................................................................-0.3V to +13V
OUT..............................................-0.3V to +6V or (V
IN
+ 0.3V)
OUT Short Circuit to IN or GND Duration ...............................60s
Note 4: Many of the MAX6133 Typical Operating Characteristics are extremely similar. The extremes of these characteristics are
found in the MAX6133 (2.5V output) and the MAX6133 (5V output). The Typical Operating Characteristics of the remainder
of the MAX6133 family typically lie between these two extremes and can be estimated based on their output voltages.
Typical Operating Characteristics (continued)
(VIN= 5V, I
OUT
= 0, TA = +25°C, unless otherwise noted.) (Note 4)
For the best line-transient performance, decouple the
input with a 0.1µF ceramic capacitor as shown in the
Typical Operating Circuit. Place the capacitor as close
to IN as possible. When transient performance is less
important, no capacitor is necessary. The MAX6133
family requires a minimum output capacitance of 0.1µF
for stability and is stable with capacitive loads (including the bypass capacitance) of up to 100µF. In applications where the load or the supply can experience step
changes, a larger output capacitor reduces the amount
of overshoot (undershoot) and improves the circuit’s
transient response. Place output capacitors as close to
the device as possible.
Supply Current
The quiescent supply current of the MAX6133 series
reference is typically 40µA and is virtually independent
of the supply voltage. In the MAX6133 family, the load
current is drawn from the input 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.
When the supply voltage is below the minimum-specified input voltage (as during turn-on), the devices can
draw up to 150µA beyond the nominal supply current.
The input voltage source must be capable of providing
this current to ensure reliable turn-on.
Thermal Hysteresis
Thermal hysteresis is the change in 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 bandgap core transistors. The typical thermal hysteresis value is 120ppm for both SO and µMAX
packages.
Turn-On Time
These devices typically turn on and settle to within
0.01% of their final value in <1ms. The turn-on time can
increase up to 2ms with the device operating at the
minimum dropout voltage and the maximum load.
Low-Power, 14-Bit DAC
with MAX6133 as a Reference
Figure 1 shows a typical application circuit for the
MAX6133 providing both the power supply and precision
reference voltage for a 14-bit high-resolution, serialinput, voltage-output digital-to-analog converter. The
MAX6133 with a 2.5V output provides the reference voltage for the DAC.
Pin Description
Figure 1. 14-Bit High-Resolution DAC and Positive Reference
From a Single 3V Supply
PINNAMEFUNCTION
1, 3, 7N.C.No Connection. Not connected internally. Leave unconnected or connect to GND.
2INPositive Power-Supply Input
4GNDGround
5, 8I.C.Internally Connected. Do not connect externally.
6OUTReference Output Voltage. Connect a 0.1µF minimum capacitor to GND.
Figure 3. Temperature Coefficient vs. Operating Temperature Range for a 1LSB Maximum Error
Negative Low-Power Voltage Reference
As shown in Figure 2, the MAX6133 can be used to
develop a negative voltage reference using the
MAX400, a rail-to-rail op-amp with low power, low
noise, and low offset. The circuit only provides a good
negative reference and is ideal for space- and costsensitive applications since it does not use resistors.
Temperature Coefficient vs.
Operating Temperature Range
for a 1LSB Maximum Error
In a data converter application, the converter’s reference voltage 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 3
shows the maximum allowable reference-voltage temperature coefficient that keeps the conversion error to
less than 1LSB. This is a function of the operating temperature range (T
MAX
- T
MIN
) 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.
(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.)
N
1
TOP VIEW
e
FRONT VIEW
INCHES
DIM
MIN
0.053A
0.004
A1
0.014
B
0.007
C
e0.050 BSC1.27 BSC
0.150
HE
D
A
B
A1
C
L
E
H0.2440.2285.806.20
0.016L
VARIATIONS:
INCHES
MINDIM
D
0.1890.197AA5.004.808
0.3370.344AB8.758.5514
D
0∞-8∞
MAX
0.069
0.010
0.019
0.010
0.157
0.050
MAX
0.3940.386D
MILLIMETERS
MAX
MIN
1.35
1.75
0.10
0.25
0.35
0.49
0.19
0.25
3.804.00
0.401.27
MILLIMETERS
MAX
MIN
9.8010.00
N MS012
16
AC
SOICN .EPS
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
21-0041
REV.DOCUMENT CONTROL NO.APPROVAL
1
B
1
MAX6133
3ppm/°C, Low-Power, Low-Dropout
Voltage Reference
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 ____________________ 13
(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.)
0.6±0.1
0.6±0.1
8
b
EH
A1
A
ÿ 0.50±0.1
1
D
TOP VIEW
A2
e
FRONT VIEW
4X S
BOTTOM VIEW
c
L
SIDE VIEW
8
1
DIM
A
A1
A2
b
c
D
e
E
H
L
α
S
INCHES
MIN
-
0.002
0.030
0.010
0.005
0.116
0.0256 BSC
0.116
0.188
0.016
0∞
0.0207 BSC
MAX
0.043
0.006
0.037
0.014
0.007
0.120
0.120
0.198
0.026
6∞
MILLIMETERS
MIN
0.050.15
0.250.36
0.130.18
2.953.05
2.953.05
4.78
0.41
MAX
-1.10
0.950.75
0.65 BSC
5.03
0.66
0.5250 BSC
6∞0∞
α
8LUMAXD.EPS
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
REV.DOCUMENT CONTROL NO.APPROVAL
21-0036
1
J
1
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