LM4041DIM3-1.2+T Maxim Integrated Products, LM4041DIM3-1.2+T Datasheet - Page 5

• Manufacturer Part Number: LM4041DIM3-1.2+T
• Description: IC VREF PREC MICROPWR SOT23-3
• Manufacturer: Maxim Integrated Products

Specifications of LM4041DIM3-1.2+T

• Reference Type: Shunt
• Voltage - Output: 1.225V
• Tolerance: ±1%
• Temperature Coefficient: 150ppm/°C
• Number Of Channels: 1
• Current - Cathode: 65µA
• Current - Output: 12mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Product: Voltage References
• Topology: Shunt References
• Output Voltage: 1.225 V
• Initial Accuracy: 0.5 %
• Average Temperature Coefficient (typ): 100 PPM / C
• Shunt Current (max): 12 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Shunt Current (min): 60 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Current - Quiescent: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: LM4041DIM3-1.2+T

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.
The LM4041’s internal pass transistor is used to main-
tain a constant output voltage (V
necessary amount of current across a source resistor.
The source resistance (R
current (I
V
Choose the value of R
I
60µA at all times. The R
to keep I
when V
prevent damage to the device, I
exceed 20mA.
Therefore, the value of R
equation:
Choosing a larger resistance minimizes the total power
dissipation in the circuit by reducing the shunt current
(P
incorporate the worst-case tolerance of the resistor
LOAD
SHUNT
D(TOTAL)
PIN
1
2
3
[V
[V
is at a maximum. Maintain a minimum I
S
, and desired quiescent current.
S(MIN)
S(MAX)
LOAD
SHUNT
is maximum and I
= V
NAME
N.C.
+
−
- V
) range, supply voltage (V
- V
S
Applications Information
less than 12mA for proper regulation
R
✕
R
_______________________________________________________________________________________
] / [60µA + I
I
] / [20mA + I
SHUNT
Positive Terminal of the Shunt Reference
Negative Terminal of the Shunt Reference
Leave this pin unconnected, or connect to pin 2.
Detailed Description
S
S
when V
S
S
value should be large enough
) is determined from the load
). Provide a safety margin to
is bounded by the following
LOAD
LOAD(MAX)
LOAD(MIN)
S
SHUNT
SHUNT
is at a minimum and
is at a minimum. To
Improved Precision Micropower
) by sinking the
] > R
should never
S
]
) variations,
SHUNT
S
>
of
Shunt Voltage Reference
used. Ensure that the resistor’s power rating is ade-
quate, using the following general power equation:
The LM4041 does not require an external capacitor for
frequency stability and is stable for any output capaci-
tance.
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.
Figure 3. Typical Operating Circuit
FUNCTION
P
R
I
SHUNT
= I
R
S
SHUNT
V
S
Temperature Performance
I
SHUNT
✕
I
LM4041
LOAD
(V
+ I
Output Capacitance
S(MAX)
Pin Description
LOAD
- V
V
R
R
)
5