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MAX6138C Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX6138C
Description  0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6138C Datasheet(HTML) 11 Page - Maxim Integrated Products

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0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
______________________________________________________________________________________
11
Detailed Description
The MAX6138 shunt reference uses the bandgap prin-
ciple to produce a stable, accurate voltage. The device
behaves similarly to an ideal zener diode; a fixed volt-
age is maintained across its output terminals when
biased with 60µA to 15mA of reverse current. The
MAX6138 behaves similarly to a silicon diode when
biased with forward currents up to 10mA.
Figure 3 shows a typical operating circuit. The
MAX6138 is ideal for providing a stable reference from
a high-voltage power supply.
Applications Information
The MAX6138’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 15mA 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 X 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:
PDR = ISHUNT
(VS(MAX) - VSHUNT)
Output Capacitance
The MAX6138 does not require an external capacitor
for operational stability and is stable for any output
capacitance.
Temperature Performance
The MAX6138 typically exhibits an output voltage tem-
perature coefficient within ±4ppm/°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: 70
PROCESS: BiCMOS
Pin Description
PIN
NAME
FUNCTION
1
+
Positive Terminal of the Shunt Reference
2
-
Negative Terminal of the Shunt Reference
3
N.C.
No Connection. Leave this pin unconnected or connect to Pin 2.
MAX6138
ILOAD
ISHUNT
RS
VS
VR
ISHUNT + ILOAD
Figure 3. Typical Operating Circuit


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