MCP1501 High Precision Buffered Voltage Reference

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DS20005474E-page 1

MCP1501

Features

• Maximum Temperature Coefficient: 50 ppm/°C 

from –40°C to +125°C

• Initial Accuracy: 0.1% 
• Operating Temperature Range: –40 to +125°C
• Low Typical Operating Current: 140 μA
• Line Regulation: 50 ppm/V Maximum
• Load Regulation: 40 ppm/mA Maximum
• 8 Voltage Variants Available:

- 1.024V
- 1.250V
- 1.800V
- 2.048V
- 2.500V
- 3.000V
- 3.300V
- 4.096V

• Output Noise: 27 µVRMS, 10 Hz to 10 kHz 

(1.024V)

Applications

• Precision Data Acquisition Systems
• High-Resolution Data Converters
• Medical Equipment Applications
• Industrial Controls
• Battery-Powered Devices

General Description

The MCP1501 is a buffered voltage reference capable
of sinking and sourcing 20 mA of current. The voltage
reference is a low-drift bandgap-based reference. The
bandgap uses chopper-based amplifiers, effectively
reducing the drift to zero. 
The MCP1501 is available in the following packages:
• 6-Lead SOT-23
• 8-Lead SOIC
• 8-Lead  2 mm x 2 mm  WDFN

Package Types

4

1

2

3

6 V

DD

SHDN

OUT

GND

GND

5 GND

MCP1501
6-Lead SOT-23

FEEDBACK

GND

V

DD

GND

SHDN

OUT

MCP1501
8-Lead SOIC

GND

GND

MCP1501
2x2 WDFN*

SHDN

GND

GND

OUT

GND

1

2

3

4

8

7

6

5 GND

FEEDBACK

V

DD

EP

9

*Includes Exposed Thermal Pad (EP). See 

Table 3-1

8
7

6
5

1
2

3
4

High-Precision Buffered Voltage Reference

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MCP1501

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BLOCK DIAGRAM

Shutdown

Circuitry

Σ 

OUT

FEEDBACK

SHDN

GND

V

DD

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DS20005474E-page 3

MCP1501

1.0

ELECTRICAL CHARACTERISTICS 

Absolute Maximum Ratings

(†)

V

DD

.............................................................................................................................................................................5.5V

Maximum current into V

DD

 pin ............................................................................................................................... 30 mA

Clamp current, I

K

 (V

PIN

 < 0 or V

PIN

 > V

DD

)...........................................................................................................±20 mA

Maximum output current sunk by OUTPUT pin ......................................................................................................30 mA
Maximum output current sourced by OUTPUT pin .................................................................................................30 mA
(HBM:CDM:MM)................................................................................................................................ (2 kV:±1.5 kV:200V)

† Notice

: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operation listings of this specification is not implied. Exposure above maximum rating conditions for
extended periods may affect device reliability.

TABLE 1-1:

DC CHARACTERISTICS

Electrical Characteristics:

 Unless otherwise specified, V

DD(MIN)

 

V

DD

 

 5.5V at –40C  T

A

 

 +125C.

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

Supply Voltage

V

DD

1.65

5.5

V

MCP1501-10

V

DD

1.65

5.5

V

MCP1501-12

V

DD

2.0

5.5

V

MCP1501-18

V

DD

2.25

5.5

V

MCP1501-20

V

DD

2.70

5.5

V

MCP1501-25

V

DD

3.2

5.5

V

MCP1501-30

V

DD

3.5

5.5

V

MCP1501-33

V

DD

4.3

5.5

V

MCP1501-40

Power-on-Reset 
Release Voltage

V

POR

1.45

V

Power-on-Reset 
Rearm Voltage

0.8

V

Output Voltage MCP1501-10

V

OUT

1.0230

1.0240

1.0250

V

MCP1501-12

1.2488

1.2500

1.2513

V

MCP1501-18

1.7982

1.800

1.8018

V

MCP1501-20

2.0460

2.0480

2.0500

V

MCP1501-25

2.4975

2.500

2.5025

V

MCP1501-30

2.9970

3.000

3.0030

V

MCP1501-33

3.2967

3.300

3.3033

V

MCP1501-40

4.0919

4.0960

4.1001

V

Temperature 
Coefficient

MCP1501-XX

T

C

10

50

ppm/

C

Line 
Regulation

V

OUT 

/

V

IN

5

50

ppm/V

Load 
Regulation

V

OUT 

/

I

OUT

10 ppm – 

sink

15 ppm – 

source

40 ppm – 

sink

70 ppm – 

source

ppm/mA –5 mA < I

LOAD

< +5 mA

Dropout 
Voltage

V

DO

200

mV

–5 mA < I

LOAD

< +2 mA

Power Supply 
Rejection 
Ratio

PSRR

94 dB

1.024V option, V

IN

= 5.5V,

60 Hz at 100 mV

P-P

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MCP1501

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Shutdown

V

IL

1.35

V

IN

= 5.5V

V

IH

3.80

Output Voltage 
Hysteresis

∆V

OUT_HYST

300 µV

Refer to 

Section 1.1.10 

“Output Voltage 
Hysteresis”

 for additional 

details on testing conditions.

Output Noise

MCP1501-10

e

N

14

µVRMS

0.1 Hz to 10 Hz, T

A

= +25

C

27

10 Hz to 10 kHz, T

A

= +25

C

MCP1501-40

e

N

20

µVRMS

0.1 Hz to 10 Hz, T

A

= +25

C

110

10 Hz to 10 kHz, T

A

= +25

C

Maximum 
Load Current

I

LOAD

±20

mA

T

A

= +25°C

2.048V option

Supply 
Current

I

DD

140

550

µA

No Load

350

No Load, T

A

= +25°C

Shutdown 
Current

MCP1501-10

I

SHDN

205 nA

T

A

= +25°C

MCP1501-20

185

MCP1501-40

185

TABLE 1-1:

DC CHARACTERISTICS (CONTINUED)

Electrical Characteristics:

 Unless otherwise specified, V

DD(MIN)

 

V

DD

 

 5.5V at –40C  T

A

 

 +125C.

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

TABLE 1-2:

TEMPERATURE SPECIFICATIONS

Electrical Specifications:

 Unless otherwise indicated, all parameters apply at AV

DD, 

DV

DD

 = 2.7 to 3.6V.

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Temperature Ranges
Operating Temperature Range

T

A

–40

+125

°C

Storage Temperature Range

T

A

–65

+150

°C

Thermal Package Resistance
Thermal Resistance for SOT-23-6

JA

+190.5

°C/W

Thermal Resistance for SOIC-8

JA

+149.5

°C/W

Thermal Resistance for DFN-8

JA

+141.3

°C/W

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DS20005474E-page 5

MCP1501

1.1

Terminology

1.1.1

OUTPUT VOLTAGE

Output voltage is the reference voltage that is available
on the OUT pin.

1.1.2

INPUT VOLTAGE

The input voltage (V

IN

) is the range of voltage that can

be applied to the V

DD

 pin and still have the device

produce the designated output voltage on the OUT pin.

1.1.3

TEMPERATURE COEFFICIENT 
(TC

OUT

)

The output temperature coefficient or voltage drift is a
measure of how much the output voltage will vary from
its initial value with changes in ambient temperature.
The value specified in the electrical specifications is
measured as shown in 

Equation 1-1

.

EQUATION 1-1:

TC

OUTPUT

 CALCULATION

1.1.4

DROPOUT VOLTAGE

The dropout voltage is defined as the voltage difference
between V

DD

 and V

OUT

 under load. 

Equation 1-2

 is

used to calculate the dropout voltage.

EQUATION 1-2:

1.1.5

LINE REGULATION

An ideal voltage reference will maintain a constant out-
put voltage regardless of any changes to the input volt-
age. However, when real devices are considered, a
small error may be measured on the output when an
input voltage change occurs.
Line regulation is defined as the change in output volt-
age (

V

OUT

) as a function of a change in input voltage

(

V

IN

), and expressed as a percentage, as shown in

Equation 1-3

.

EQUATION 1-3:

Line regulation may also be expressed as %/V or in
ppm/V, as shown in 

Equation 1-4

 and 

Equation 1-5

,

respectively.

EQUATION 1-4:

EQUATION 1-5:

As an example, if the MCP1501-20 is implemented in a
design and a 2 µV change in output voltage is mea-
sured from a 250 mV change on the input, then the
error in percent, ppm, percent/volt, and ppm/volt, as
shown in 

Equation 1-6

Equation 1-9

.

EQUATION 1-6:

EQUATION 1-7:

EQUATION 1-8:

EQUATION 1-9:

TC

OUT

V

OUT MAX

 VOUT MIN

T

V

OUT NOM

---------------------------------------------------------------------------

10

6

ppm/

C

=

Where:

V

OUT(MAX)

= Maximum output voltage over the 

temperature range

V

OUT(MIN)

= Minimum output voltage over the 

temperature range

V

OUT(NOM)

= Average output voltage over the 

temperature range

T = Temperature range over which the 

data was collected

V

DO

 

V

IN

V

OUT

 | I

OUT

 Cons

t

tan

=

=

V

OUT

V

IN

--------------------

100%

 % 

Line 

Regulation

=

V

OUT

V

OUT NOM

-----------------------------------

V

IN

-----------------------------------------

100% 

%

V

----- Line Regulation

=

V

OUT

V

OUT NOM

-----------------------------------

V

IN

-----------------------------------------

10

6

ppm

V

----------- Line Regulation

=

V

OUT

V

IN

--------------------

100%

V

250 mV

------------------

100%

.0008%

=

V

OUT

V

IN

--------------------

10

6

V

250 mV

------------------

10

6

8 ppm

=

V

OUT

V

IN

--------------------

100%

 

V

2.048V

-----------------

250 mV

-----------------------

100%

 0.000390625 

%

V

-----

=

=

V

OUT

V

IN

--------------------

10

6

 

V

2.048V

-----------------

250 mV

-----------------------

10

6

 

3.90625

 

ppm

V

------------

=

=

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MCP1501

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1.1.6

LOAD REGULATION

An ideal voltage reference will maintain the specified
output voltage regardless of the load's current demand.
However, real devices experience a small error voltage
that deviates from the specified output voltage when a
load is present. 
Load regulation is defined as the voltage difference
when under no load (V

OUT

 @ I

OUT|0

) and under maxi-

mum load (V

OUT

 @ I

OUT|MAX

), and is expressed as a

percentage, as shown in 

Equation 1-10

.

EQUATION 1-10:

Similar to line regulation, load regulation may also be
expressed as %/mA or in ppm/mA as shown in

Equation 1-11

 and 

Equation 1-12

, respectively.

EQUATION 1-11:

EQUATION 1-12:

As an example, if the MCP1501-20 is implemented in a
design and a 10 µV change in output voltage is mea-
sured from a 2 mA change on the input, then the error
in percent, ppm, percent/volt, ppm/volt, as shown in

Equation 1-13

Equation 1-16

.

EQUATION 1-13:

EQUATION 1-14:

EQUATION 1-15:

EQUATION 1-16:

V

OUT  

@ I

OUT|0

V

OUT

 @ I

OUT|MAX

 

V

OUT

 @ I

OUT|0

--------------------------------------------------------------------------------------------------------------

100% 

% Load Regulation

=

V

OUT

V

OUT NOM

-----------------------------------

I

OUT

-----------------------------------------

100% 

%

mA

-------- Load Regulation

=

V

OUT

V

OUT NOM

-----------------------------------

I

OUT

-----------------------------------------

10

6

ppm

mA

----------- Load Regulation

=

2.048V

2.04799V

2.04799V

-----------------------------------------------

100% .

=

0004882%

2.048V

2.04799V

2.04799V

-----------------------------------------------

10

6

2.048V

2.04799V

2.04799V

-----------------------------------------------  10

6

=

4.882 ppm

=

V

OUT

V

OUT NOM

------------------------------------

I

OUT

------------------------------------------  100%

 

10 

V

2.048V

-----------------

2 mA

-----------------------

 100%

 0.2441 

%

mA

--------

=

=

V

OUT

V

OUT NOM

------------------------------------

I

OUT

------------------------------------------  10

6

 

10 

V

2.048V

-----------------

2 mA

-----------------------

 10

6

 2.441 

ppm

mA

-----------

=

=

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DS20005474E-page 7

MCP1501

1.1.7

INPUT CURRENT

The input current (operating current) is the current that
sinks from V

IN

 to GND without a load current on the

output pin. This current is affected by temperature,
input voltage, output voltage, and the load current.

1.1.8

POWER SUPPLY REJECTION 
RATIO

Power supply rejection ratio (PSRR) is a measure of
the change in output voltage (∆V

OUT

) relative to the

change in input voltage (∆V

IN

) over frequency.

1.1.9

LONG-TERM DRIFT

The long-term output stability is measured by exposing
the devices to an ambient temperature of +125°C, as
shown in 

Figure 2-18

 while configured in the circuit

shown in 

Figure 1-1

. In this test, all electrical specifica-

tions of the devices are measured periodically at
+25°C.

FIGURE 1-1:

Long-Term Drift Test Circuit.

1.1.10

OUTPUT VOLTAGE HYSTERESIS

The output voltage hysteresis is a measure of the out-
put voltage error after the powered devices are cycled
over the entire operating temperature range. The
amount of hysteresis can be quantified by measuring
the change in the +25°C output voltage after tempera-
ture excursions from +25°C to +125°C to +25°C, and
also from +25°C to –40°C to +25°C.

V

IN

GND

GND

GND

GND

GND

FB

V

OUT

Power

Signal In

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MCP1501

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2.0

TYPICAL OPERATING CURVES

Note:

 Unless otherwise specified, maximum values are: V

DD(MIN)

 

V

DD

 

 5.5V at –40C  T

A

 

 +125C.

FIGURE 2-1:

V

OUT

 vs. Temperature, No 

Load, 4.096V Option.

FIGURE 2-2:

V

OUT

 vs. Temperature, No 

Load, 2.048V Option.

FIGURE 2-3:

V

OUT

 vs. Temperature, No 

Load, 1.024V Option.

FIGURE 2-4:

Load Regulation vs. 

Temperature, I

LOAD

 5mA Sink.

FIGURE 2-5:

Load Regulation vs. 

Temperature, I

LOAD

 5mA Source.

FIGURE 2-6:

I

DD

 vs. Temperature, All 

Options.

Note:

The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

4.092

4.093

4.094

4.095

4.096

4.097

4.098

-40

5

25

85

125

V

out (V) 

Temperature (

°C) 

2.046

2.0465

2.047

2.0475

2.048

2.0485

-40

5

25

85

125

V

out (V)

 

Temperature (

°C) 

1.023

1.0232

1.0234

1.0236

1.0238

1.024

1.0242

1.0244

-40

5

25

85

125

V

out (V) 

Temperature (

°C) 

0

5

10

15

20

25

30

35

40

-40

25

125

Load Reg 

(ppm/mA) 

Temperature (

°C) 

1.024V

1.25V

1.8V

2.048V

2.5V

3V

3.3V

4.096V

0

5

10

15

20

25

30

35

40

-40

25

125

Load Reg (ppm/mA) 

Temperature (

°C) 

1.024V

1.25V

1.8V

2.048V

2.5V

3V

3.3V

4.096V

150

175

200

225

250

275

300

-40

5

25

85

125

I

DD

(µA)

Temperature (

°C)

V

287

 = 4.096V

V

287

= 2.048V

V

287

= 1.024V

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DS20005474E-page 9

MCP1501

FIGURE 2-7:

I

DD

 vs. Temperature for 

V

OUT

, 50 Units, No Load, 4.096V Option.

FIGURE 2-8:

I

DD

 vs. Temperature for 

V

OUT

, 50 Units, No Load, 1.024V Option.

FIGURE 2-9:

I

DD

 vs. V

DD

, V

OUT

 = 4.096V, 

50 Units, No Load.

FIGURE 2-10:

I

DD

 vs. V

DD

, V

OUT

 = 1.024V, 

50 Units, No Load.

FIGURE 2-11:

Line Regulation vs. 

Temperature.

FIGURE 2-12:

Noise vs. Frequency, No 

Load, T

A

 = +25°C.

0

50

100

150

200

250

300

350

400

450

-40

5

25

85

125

I

DD

 (µA) 

Temperature (

°C) 

Average

+3 Sigma

-3 Sigma

0

50

100

150

200

250

300

-40

5

25

85

125

I

DD

 (µA) 

Temperature (

°C) 

Average
+3 Sigma
-3 Sigma

0

50

100

150

200

250

300

350

4.3

4.45

4.6

4.75

4.9

5.05

5.2

5.5

I

DD

 (µA) 

V

DD

 (V) 

Average
+3 Sigma
-3 Sigma

100

120

140

160

180

200

220

240

260

1.65

2

2.25

2.5

2.75

3

3.25

3.5

3.75

4

4.25

4.5

4.75

5

5.25

5.5

I

DD

 (µA) 

V

DD

 (V) 

Average
-3 Sigma
+3 Sigma

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

-40 -25 -10

5

20

35

50

65

80

95 110 125

Line Reg (ppm/V)

Temperature (

°C)

V

287

 = 1.8V

V

287

 = 3.0V

V

287

 = 1.024V

V

287

 = 2.048V

V

287

 = 3.3V

V

287

 = 1.25V

V

287

 = 2.5V

V

287

 = 4.096V

0.01

0.1

1

10

100

1000

0.1

10

1000

100000

Noise Density

 (uV/rtHz)

 

Frequency (Hz) 

1.024V
4.096V

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FIGURE 2-13:

PSRR vs. Frequency, No 

Load, T

A

 = +25°C.

FIGURE 2-14:

PSRR vs. Frequency, 1 kΩ 

Load, T

A

 = +25°C.

FIGURE 2-15:

Dropout Voltage vs. Load, 

T

A

 = +25°C, 2.048V Option.

FIGURE 2-16:

Tempco Distribution, No 

Load, T

A

 = +25°C, V

DD

 = 2.7V, 50 Units.

FIGURE 2-17:

Tempco Distribution, No 

Load, T

A

 = +25°C, V

DD

 = 5.5V, 50 Units.

FIGURE 2-18:

V

OUT

 Drift vs. Time, 

T

A

 = +25°C, No Load, 800 Units.

0

20

40

60

80

100

120

1

10

100

1000

10000

100000

PSRR (dB)

Frequency (Hz)

V

287

 = 1.024, V

,1

 = 1.65V

V

287

 = 1.024V, V

,1

 = 5.5V

V

287

 = 4.096V, V

,1

 = 4.3V

V

287

 = 4.096V, V

,1

 = 5.5V

0

20

40

60

80

100

120

1

10

100

1000

10000

100000

PSRR (dB)

Frequency (Hz)

V

287

= 1.024V, V

,1

= 1.65V

V

287

 = 1.024V, V

,1

 = 5.5V

V

287

 = 4.096V, V

,1

 = 4.3V

V

287

 = 4.096V, V

,1

 = 5.5V

0

20

40

60

80

100

120

140

160

-5

-2

0

2

5

Dropout V

oltage (mV)

 

Load (mA) 

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

1

3

5

7

9 11 13 15 17 19 21 23 25 27 29

Percentage of 

T

otal Units

Temperature Coefficient (ppm/

&)

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

1

3

5

7

9 11 13 15 17 19 21 23 25 27 29

Percentage of 

T

otal 

Units

Temperature Coefficient (ppm/

&)

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

0

48

1008

V

OUT

 Drift 

(mV) 

Time (Hrs) 

Average

+3 Sigma

-3 Sigma

Maker
Microchip Technology Inc.
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