LM4041 Datasheet PDF - Maxim Integrated
| Part Number | LM4041 | |
| Description | Improved Precision Micropower Shunt Voltage Reference | |
| Manufacturers | Maxim Integrated | |
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19-1704; Rev 0; 4/00
Improved Precision Micropower
Shunt Voltage Reference
General Description
The LM4041 is a precision two-terminal shunt mode,
bandgap voltage reference with a fixed reverse break-
down voltage of 1.225V. Ideal for space-critical appli-
cations, the LM4041 is offered in the subminiature 3-pin
SC70 surface-mount package (1.8mm ✕ 1.8mm), 50%
smaller than comparable devices in SOT23 surface-
mount packages (SOT23 versions are also available).
Laser-trimmed resistors ensure precise initial accuracy.
With a 100ppm/°C temperature coefficient, the device
is offered in four grades of initial accuracy ranging from
0.1% to 1%. The LM4041 has a 60µA to 12mA shunt
current capability with low dynamic impedance, ensur-
ing stable reverse breakdown voltage accuracy over a
wide range of operating temperatures and currents.
The LM4041 does not require an external stabilizing
capacitor while ensuring stability with any capacitive
load.
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
Features
o Ultra-Small 3-Pin SC70 Package
o 0.1% max Initial Accuracy
o 100ppm/°C max Temperature Coefficient
Guaranteed over -40°C to +85°C Temperature
Range
o Wide Operating Current Range: 60µA to 12mA
o Low 20µVRMS Output Noise (10Hz to 10kHz)
o 1.225V Fixed Reverse Breakdown Voltage
o No Output Capacitors Required
o Tolerates Capacitive Loads
Ordering Information
PART*
LM4041AIX3-1.2
LM4041AIM3-1.2
LM4041BIX3-1.2
LM4041BIM3-1.2
LM4041CIX3-1.2
LM4041CIM3-1.2
LM4041DIX3-1.2
LM4041DIM3-1.2
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
3 SC70-3
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
3 SOT23-3
TOP
MARK
ABF
FZEB
ABG
FZEC
ABH
FZED
ABI
FZEE
*See Selector Guide for a listing of LM4041 Output Voltage,
Initial Accuracy, and Temperature Coefficient specifications.
Pin Configuration
Selector Guide
TOP VIEW
+1
-2
LM4041
3 N.C.*
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
PART
LM4041AIM3-1.2
LM4041AIX3-1.2
LM4041BIM3-1.2
LM4041BIX3-1.2
LM4041CIM3-1.2
LM4041CIX3-1.2
LM4041DIM3-1.2
LM4041DIX3-1.2
OUTPUT
VOLTAGE
(V)
1.225
1.225
1.225
1.225
1.225
1.225
1.225
1.225
INITIAL
ACCURACY
(%)
0.1
0.1
0.2
0.2
0.5
0.5
1.0
1.0
TEMPCO
(ppm/°C)
100
100
100
100
100
100
150
150
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
|
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Improved Precision Micropower
Shunt Voltage Reference
Detailed Description
The LM4041 shunt references use the bandgap princi-
ple to produce a stable, accurate voltage. The device
behaves similarly to an ideal zener diode; a fixed volt-
age of +1.225V is maintained across its output termi-
nals when biased with 60µA to 12mA of reverse
current. The LM4041 behaves similarly to a silicon
diode when biased with forward currents up 10mA.
Figure 3 shows a typical operating circuit. The LM4041
is ideal for providing a stable reference from a high-
voltage power supply.
Applications Information
The LM4041’s internal pass transistor is used to main-
tain a constant output voltage (VSHUNT) by sinking the
necessary amount of current across a source resistor.
The source resistance (RS) is determined from the load
current (ILOAD) range, supply voltage (VS) variations,
VSHUNT, and desired quiescent current.
Choose the value of RS when VS is at a minimum and
ILOAD is at a maximum. Maintain a minimum ISHUNT of
60µA at all times. The RS value should be large enough
to keep ISHUNT less than 12mA for proper regulation
when VS is maximum and ILOAD is at a minimum. To
prevent damage to the device, ISHUNT should never
exceed 20mA.
Therefore, the value of RS is bounded by the following
equation:
[VS(MIN) - VR ] / [60µA + ILOAD(MAX)] > RS >
[VS(MAX) - VR ] / [20mA + ILOAD(MIN)]
Choosing a larger resistance minimizes the total power
dissipation in the circuit by reducing the shunt current
(PD(TOTAL) = VS ✕ ISHUNT). Provide a safety margin to
incorporate the worst-case tolerance of the resistor
used. Ensure that the resistor’s power rating is ade-
quate, using the following general power equation:
PR = ISHUNT ✕ (VS(MAX) - VR)
VS
RS
ISHUNT
ISHUNT + ILOAD
ILOAD
VR
LM4041
Figure 3. Typical Operating Circuit
Output Capacitance
The LM4041 does not require an external capacitor for
frequency stability and is stable for any output capaci-
tance.
Temperature Performance
The LM4041 typically exhibits an output voltage tem-
perature coefficient within ±15ppm/°C. The polarity of
the temperature coefficient may be different from one
device to another; some may have positive coefficients,
and others may have negative coefficients.
Chip Information
TRANSISTOR COUNT: 60
PROCESS: BiCMOS
_______________________________________________________________________________________ 5
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| Information | Total 8 Pages | |
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