LM4050AEM3-2.5+T Maxim Integrated Products, LM4050AEM3-2.5+T Datasheet - Page 11

• Manufacturer Part Number: LM4050AEM3-2.5+T
• Description: IC PREC MCRPWR REF 2.5V SOT23-3
• Manufacturer: Maxim Integrated Products

Specifications of LM4050AEM3-2.5+T

• Reference Type: Shunt
• Voltage - Output: 2.5V
• Tolerance: ±0.1%
• Temperature Coefficient: 50ppm/°C
• Number Of Channels: 1
• Current - Cathode: 65µA
• Current - Output: 15mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Product: Voltage References
• Topology: Shunt References
• Output Voltage: 2.5 V
• Initial Accuracy: 0.1 %
• Average Temperature Coefficient (typ): 50 PPM / C
• Shunt Current (max): 15 mA
• Maximum Operating Temperature: + 125 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: LM4050AEM3-2.5+T

The LM4050/LM4051 shunt references use the
bandgap principle to produce a stable, accurate volt-
age. The device behaves similarly to an ideal zener
diode; a fixed voltage is maintained across its output
terminals when biased with 60µA to 15mA of reverse
current. The LM4050/LM4051 clamps to a voltage of
one diode drop below ground when biased with for-
ward currents up 10mA.
Figure 3 shows a typical operating circuit. The
LM4050/LM4051 are ideal for providing stable refer-
ences from a high-voltage power supply.
The LM4050/LM4051s’ internal pass transistors are used
to maintain a constant output voltage (V
the necessary amount of current across a source resistor.
The source resistance (R
current (I
V
Choose the value of R
is at a maximum. Maintain a minimum I
times. The R
I
maximum and I
to the device, I
Therefore, the value of R
equation:
Choosing a larger resistance minimizes the total power dis-
sipation in the circuit by reducing the shunt current
(P
incorporate the worst-case tolerance of the resistor used.
Ensure that the resistor’s power rating is adequate, using
the following general power equation:
The LM4050/LM4051 do not require external capacitors
for frequency stability and are stable for any output
capacitance.
References with Multiple Reverse Breakdown Voltages
SHUNT
SHUNT
D(TOTAL)
PIN
1
2
3
[V
[V
S(MIN)
S(MAX)
, and desired quiescent current.
less than 15mA for proper regulation when V
LOAD
PD
= V
NAME
N.C.
S
SHUNT
R
- V
+
−
- V
LOAD
) range, supply voltage (V
value should be large enough to keep
S
Applications Information
= I
R
R
✕
SHUNT
] / [60µA + I
______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
] / [20mA + I
I
SHUNT
should never exceed 20mA.
S
is at a minimum. To prevent damage
Positive Terminal of the Shunt Reference
Negative Terminal of the Shunt Reference
No connection. Leave this pin unconnected or connected to pin 2.
when V
Detailed Description
✕
S
S
) is determined from the load
). Provide a safety margin to
(V
is bounded by the following
S(MAX)
S
LOAD(MAX)
Output Capacitance
LOAD(MIN)
is at a minimum and I
- V
SHUNT
SHUNT
SHUNT
] > R
]
S
of 60µA at all
) variations,
S
)
) by sinking
>
LOAD
S
is
The LM4050/LM4051 typically exhibit output voltage
temperature coefficients within ±15ppm/°C. The polari-
ty of the temperature coefficients may be different from
one device to another; some may have positive coeffi-
cients, and others may have negative coefficients.
The maximum junction temperature of the LM4050/
LM4051 is +150°C. The maximum operating temperature
for the LM4050/LM4051_E_ is +125°C. At a maximum
load current of 15mA and a maximum output voltage of
5V, the parts dissipate 75mW of power. The power dissi-
pation limits of the 3-pin SC70 call for a derating value of
2.17mW/°C above +70°C and thus for 75mW of power
dissipation, the parts self-heat to 35.56°C above ambient
temperature. If the ambient temperature is +125°C, the
parts operate at 159.56°C, thereby exceeding the maxi-
mum junction temperature value of +150°C. For high-
temperature operation, care must be taken to ensure the
combination of ambient temperature, output power dissi-
pation, and package thermal resistance does not con-
spire to raise the device temperature beyond that listed
in the Absolute Maximum Ratings. Either reduce the out-
put load current or the ambient temperature to keep the
part within the limits.
Figure 3. Typical Operating Circuit
TRANSISTOR COUNT: 60
PROCESS: BiCMOS
FUNCTION
I
SHUNT
High Temperature Operation
R
S
Temperature Performance
V
S
I
SHUNT
Chip Information
LM4050
I
LOAD
Pin Description
+ I
LOAD
V
R
11