MAXIM LM4050, LM4051 User Manual

General Description

The LM4050/LM4051 are precision two-terminal, shuntmode, bandgap voltage references available in fixed reverse breakdown voltages of 1.225V, 2.048V, 2.500V,

3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical applications, the LM4050/LM4051 are offered in the subminiature 3-pin SC70 surface-mount packages (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount package (SOT23 versions are also available).

Laser-trimmed resistors ensure excellent initial accuracy. With a 50ppm/°C temperature coefficient, these devices are offered in three grades of initial accuracy ranging from 0.1% to 0.5%. The LM4050/LM4051 have a 60µA to 15mA shunt-current capability with low dynamic impedance, ensuring stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. The LM4050/LM4051 do not require an external stabilizing capacitor while ensuring stability with any capacitive loads.

The LM4050/LM4051 specifications are guaranteed over the temperature range of -40°C to +125°C.

________________________Applications

Portable, Battery-Powered Equipment

Notebook Computers

Cell Phones

Industrial Process Controls

Features

o 50ppm/°C (max) Temperature Coefficient

Guaranteed over the -40°C to +125°C Temperature Range

o Ultra-Small 3-Pin SC70 Package o 0.1% (max) Initial Accuracy o Wide Operating Current Range: 60µA to 15mA o Low 28µV

RMS

Output Noise (10Hz to 10kHz)

o 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and

5.000V Fixed Reverse Breakdown Voltages

o No Output Capacitors Required o Tolerates Capacitive Loads

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

________________________________________________________________

Maxim Integrated Products

Pin Configuration

Typical Operating Circuit

Selector Guide

19-2563; Rev 6; 9/11

Ordering Information appears at end of data sheet.

+Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel.

Denotes an automotive qualified parts.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

+ I

SHUNT

LOAD

SHUNT

LM4050

PIN TEMP RANGE

LM 4050_E M3- 2.1+T LM 4050_E X 3-2.1+T LM 4050_E M3- 2.5+T LM 4050_E X 3-2.5+T LM 4050_E X 3-2.5/V + T LM 4050_E M3- 3.0+T LM 4050_E M3- 3.0/V+ T LM 4050_E X 3-3.0+T LM 4050_E M3- 3.3+T LM 4050_E X 3-3.3+T LM4050_EX3-3.3/V+T LM 4050_E M3- 4.1+ T LM 4050_E M3- 4.1/V+ T LM 4050_E X 3-4.1+T LM 4050_E M3- 5.0+ T LM4050_EM3-5.0/V+T LM 4050_E X 3-5.0+T LM 4051_E M3- 1.2+ T LM 4051_E X 3-1.2+T

- 40°C to + 125°C

PIN-

PACKAGE

3 SOT23 2.048

3 SC70 2.048

3 SOT23 2.500

3 SC70 2.500

3 SC70 2.500 3 SOT23 3.000 3 SOT23 3.000

3 SC70 3.000 3 SOT23 3.300

3 SC70 3.300

3 SC70 3.300 3 SOT23 4.096 3 SOT23 4.096

3 SC70 4.096 3 SOT23 5.000 3 SOT23 5.000

3 SC70 5.000 3 SOT23 1.225

3 SC70 1.225

OUTPUT

VOLTAGE

(V)

TOP VIEW

LM4050/

LM4051

3 N.C.*

*PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2.

SC70/SOT23

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—1.225V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Reverse Current (cathode to anode) ..................................20mA

Forward Current (anode to cathode) ..................................10mA

Continuous Power Dissipation (T

= +70°C)

3-Pin SC70 (derate 2.17mW/°C above +70°C)............174mW

3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW

Operating Temperature Range

LM4050/LM4051_E_ _ _ ................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s)..................................+300°C

Soldering Temperature (reflow) .......................................+260°C

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TA = +25°C

LM4051A ±1.2 ±7

ΔV

RTOL

RMIN

ΔV

LM4051B ±2.4 ±9

LM4051C ±6.0 ±12

IR = 10mA ±20

IR = 1mA ±15 ±50

/ΔT

= 100µA ±15

≤ I

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz, IAC = 0.1I

IR = 100µA, 10Hz ≤ f ≤ 10kHz 20 µV

T = 1000h 120 ppm

≤ 1mA 0.7 1.5

≤ 12mA 2.5 8.0

LM4051A (0.1%) 1.2238 1.2250 1.2262

LM4051B (0.2%) 1.2226 1.2250 1.2275

LM4051C (0.5%) 1.2189 1.2250 1.2311

45 60 µA

0.5 1.5 Ω

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—2.048V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

TA = +25°C

LM4050A ±2.0 ±12

ΔV

RTOL

RMIN

ΔV

LM4050B ±4.0 ±14

LM4050C ±10 ±20

IR = 10mA ±20

IR = 1mA ±15 ±50

/ΔT

= 100µA ±15

≤ I

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz,

IR = 100µA, 10Hz ≤ f ≤ 10kHz 28 µV

T = 1000h 120 ppm

≤ 1mA 0.3 1.0

≤ 15mA 2.5 8.0

= 0.1I

R LM4050C 0.3 0.9

LM4050A (0.1%) 2.0460 2.0480 2.0500

LM4050B (0.2%) 2.0439 2.0480 2.0521

LM4050C (0.5%) 2.0378 2.0480 2.0582

45 65 µA

LM4050A/B 0.3 0.8

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—2.500V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

LM4050A (0.1%) 2.4975 2.5000 2.5025

ΔV

RTOL

RMIN

/ΔT

ΔV

TA = +25°C

LM4050A ±2.5 ±15

LM4050B ±5.0 ±18

LM4050C ±13 ±25

IR = 10mA ±20

IR = 1mA ±15 ±50

= 100µA ±15

≤ I

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz, I

IR = 100µA, 10Hz ≤ f ≤ 10kHz 35 µV

T = 1000h 120 ppm

≤ 1mA 0.3 1.0

≤ 15mA 2.5 8.0

= 0.1I

R LM4050C 0.3 0.9

LM4050B (0.2%) 2.4950 2.5000 2.5050

LM4050C (0.5%) 2.4875 2.5000 2.5125

LM4050A/B 0.3 0.8

45 65 µA

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS—3.000V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

ELECTRICAL CHARACTERISTICS—3.300V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

TA = +25°C

LM4050A ±3.0 ±18

RTOL

LM4050B ±6.0 ±21

LM4050C ±15 ±30

RMIN

IR = 10mA ±20

IR = 1mA ±15 ±50

/ΔT

ΔV

= 100µA ±15

≤ I

≤ 1mA 0.3 1.0

≤ 15mA 2.5 8.0

= 0.1I

R LM4050C 0.3 0.9

ΔV

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz,

IR = 100µA, 10Hz ≤ f ≤ 10kHz 45 µV

T = 1000h 120 ppm

LM4050A (0.1%) 2.9970 3.0000 3.0030

LM4050B (0.2%) 2.9940 3.0000 3.0060

LM4050C (0.5%) 2.9850 3.0000 3.0150

45 67 µA

LM4050A/B 0.3 0.8

ppm/°C

RMS

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

TA = +25°C

LM4050A ±3.0 ±18

RTOL

LM4050B ±6.0 ±21

LM4050C ±15 ±30

RMIN

IR = 10mA ±20

IR = 1mA ±15 ±50

/ΔT

ΔV

= 100µA ±15

≤ I

≤ 1mA 0.3 1.0

≤ 15mA 2.5 8.0

= 0.1I

R LM4050C 0.3 0.9

ΔV

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz,

IR = 100µA, 10Hz ≤ f ≤ 10kHz 50 µV

T = 1000h 120 ppm

LM4050A (0.1%) 3.2967 3.3000 3.3033

LM4050B (0.2%) 3.2934 3.3000 3.3066

LM4050C (0.5%) 3.2835 3.3000 3.3165

45 67 µA

LM4050A/B 0.3 0.8

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—4.096V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

LM4050A (0.1%) 4.0919 4.0960 4.1001

ΔV

RTOL

RMIN

/ΔT

ΔV

TA = +25°C

LM4050A ±4.1 ±25

LM4050B ±8.2 ±29

LM4050C ±20 ±41

IR = 10mA ±30

IR = 1mA ±20 ±50

= 100µA ±15

≤ I

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz, IAC = 0.1I

IR = 100µA, 10Hz ≤ f ≤ 10kHz 64 µV

T = 1000h 120 ppm

≤ 1mA 0.5 1.2

≤ 15mA 3.0 10.0

LM4050B (0.2%) 4.0878 4.0960 4.1042

LM4050C (0.5%) 4.0755 4.0960 4.1165

50 73 µA

0.5 1.0 Ω

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________ 7

Note 1: All devices are 100% production tested at +25°C and are guaranteed by design for TA= T

MIN

to T

MAX

, as specified.

Note 2: The limit over the full temperature range for the reverse breakdown voltage tolerance is defined as:

RTOL

] ±[(ΔVR/ ΔT) X (maxΔT) X (VR)]

where ΔV

/ ΔT is the VRtemperature coefficient, maxΔT is the difference from the +25°C reference point to T

MIN

or T

MAX

and V

is the reverse breakdown voltage.

The total tolerance over the full temperature range for the different grades where maxΔT = +100°C is shown below:

• A grade: ±0.6% = ±0.1% ±50ppm/°C



100°C

• B grade: ±0.7% = ±0.2% ±50ppm/°C



100°C

• C grade: ±1.0% = ±0.5% ±50ppm/°C



100°C

Note 3: Guaranteed by design.

ELECTRICAL CHARACTERISTICS—5.000V

(IR= 100µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage V

Reverse Breakdown Voltage Tolerance (Note 2)

Minimum Operating Current I

Average Reverse Voltage Temperature Coefficient (Notes 2, 3)

Reverse Breakdown Voltage Change with Operating Current Change

Reverse Dynamic Impedance (Note 3)

Wideband Noise e

Reverse Breakdown Voltage Long-Term Stability

TA = +25°C

LM4050A ±5.0 ±30

RTOL

LM4050B ±10 ±35

LM4050C ±25 ±50

RMIN

IR = 10mA ±30

IR = 1mA ±20 ±50

/ΔT

ΔV

= 100µA ±15

≤ I

≤ 1mA 0.5 1.4

≤ 15mA 3.5 12.0

ΔV

RMIN

1mA ≤ I

IR = 1mA, f = 120Hz, IAC = 0.1I

IR = 100µA, 10Hz ≤ f ≤ 10kHz 80 µV

T = 1000h 120 ppm

LM4050A (0.1%) 4.9950 5.0000 5.0050

LM4050B (0.2%) 4.9900 5.0000 5.0100

LM4050C (0.5%) 4.9750 5.0000 5.0250

54 80 µA

0.5 1.1 Ω

ppm/°C

RMS

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

8 _______________________________________________________________________________________

Typical Operating Characteristics

(IR= 100µA, SC70-3 package, TA= +25°C, unless otherwise noted.)

050100

REVERSE CHARACTERISTICS AND

MINIMUM OPERATING CURRENT

LM4050 toc01

REVERSE CURRENT (μA)

REVERSE VOLTAGE (V)

LM4050_I_3-5.0

LM4050_I_3-4.1

LM4050_I_3-3.0

LM4050_I_3-2.5

LM4050_I_3-2.1

LM4050-5.0V

REVERSE VOLTAGE vs. I

SHUNT

LM4050 toc05

SHUNT

(mA)

REVERSE VOLTAGE CHANGE (mV)

15105

020

TA = -40°C

TA = +125°C

TA = +85°C

TA = +25°C

LM4050-2.5V

REVERSE VOLTAGE vs. I

SHUNT

LM4050 toc04

SHUNT

(mA)

REVERSE VOLTAGE CHANGE (mV)

15105

020

TA = +125°C

TA = -40°C

TA = +25°C

TA = +85°C

OUTPUT VOLTAGE vs. TEMPERATURE

= 2.500V)

2.498

2.496

2.494

OUTPUT VOLTAGE (V)

2.492

2.490

-40 135

OUT

TEMPERATURE (°C)

OUTPUT VOLTAGE vs. TEMPERATURE

= 5.000V)

OUT

5.003

5.001

MAX4050 toc02

4.999

4.997

4.995

4.993

OUTPUT VOLTAGE (V)

4.991

4.989

11085603510-15

4.987

-40 135

TEMPERATURE (°C)

MAX4050 toc03

11085-15103560

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

(IR= 100µA, SC70-3 package, TA= +25°C, unless otherwise noted.)

GEN

AC-COUPLED

+25μA

-25μA

2mV/div

LM4050-2.5V

LOAD-TRANSIENT RESPONSE

LM4050 toc06

10μs/div

CH1: V

GEN

2V/div

CH2: V

AC-COUPLED 2mV/div

SHUNT

= 100μA ± 25μA, RL = 100kΩ, SEE FIGURE 1.

GEN

AC-COUPLED

+2.5mA

-2.5mA

20mV/div

LM4050-2.5V

LOAD-TRANSIENT RESPONSE

LM4050 toc10

10μs/div

SHUNT

= 10mA ± 2.5mA

= 1kΩ, SEE FIGURE 1.

GEN

AC-COUPLED

+2.5mA

-2.5mA

20mV/div

LM4050-5.0V

LOAD-TRANSIENT RESPONSE

LM4050 toc11

10μs/div

SHUNT

= 10mA ± 2.5mA

= 1kΩ, SEE FIGURE 1.

GEN

AC-COUPLED

+250μA

-250μA

10mV/div

LM4050-5.0V

LOAD-TRANSIENT RESPONSE

LM4050 toc09

10μs/div

SHUNT

= 1mA ± 250μA

= 10kΩ, SEE FIGURE 1.

Figure 1. Load-Transient Test Circuit

LM4050-5.0V

LOAD-TRANSIENT RESPONSE

GEN

AC-COUPLED

40μs/div

= 100μA ± 25μA

SHUNT

= 100kΩ, SEE FIGURE 1.

LM4050 toc07

+25μA

-25μA

10mV/div

LM4050-2.5V

LOAD-TRANSIENT RESPONSE

GEN

AC-COUPLED

10μs/div

= 1mA ± 250μA

SHUNT

= 10kΩ, SEE FIGURE 1.

LM4050 toc08

+250μA

-250μA

10mV/div

1kΩ

SHUNT

GEN

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

10 ______________________________________________________________________________________

Typical Operating Characteristics (continued)

(IR= 100µA, SC70-3 package, TA= +25°C, unless otherwise noted.)

OUT

LM4050-2.5V

STARTUP CHARACTERISTICS

LM4050 toc12

01620812424283236

RESPONSE TIME (μs)

RS = 30kΩ

SEE FIGURE 2.

110010 1k 10k

LM4050-2.5V

NOISE vs. FREQUENCY

LM4050 toc16

FREQUENCY (Hz)

10,000

100

1000

NOISE (nV/√Hz)

110010 1k 10k

LM4050-5.0V

NOISE vs. FREQUENCY

LM4050 toc17

FREQUENCY (Hz)

10,000

100

1000

NOISE (nV/√Hz)

0.1k 10k1k 100k 1M

LM4050-5.0V

OUTPUT IMPEDANCE vs. FREQUENCY

LM4050 toc15

FREQUENCY (Hz)

IMPEDANCE (Ω)

100

0.1

IR = 150μA

IR = 1mA

C1 = 0

C1 = 1μF

Figure 2. Startup Characteristics Test Circuit

LM4050-5.0V

STARTUP CHARACTERISTICS

OUT

RS = 16kΩ

0405020 3010 60 70 80 90

SEE FIGURE 2.

RESPONSE TIME (μs)

LM4050 toc13

OUTPUT IMPEDANCE vs. FREQUENCY

LM4050-2.5V

1000

100

IMPEDANCE (Ω)

0.1

C1 = 1μF

IR = 150μA

C1 = 0

IR = 1mA

0.1k 10k1k 100k 1M FREQUENCY (Hz)

LM4050 toc14

1Hz RATE

50%

DUTY CYCLE

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

______________________________________________________________________________________ 11

Detailed Description

The LM4050/LM4051 shunt references use the bandgap principle to produce a stable, accurate voltage. 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 forward currents up 10mA.

Figure 3 shows a typical operating circuit. The LM4050/LM4051 are ideal for providing stable references from a high-voltage power supply.

Applications Information

The LM4050/LM4051s’ internal pass transistors are used to maintain a constant output voltage (V

SHUNT

) by sinking the necessary amount of current across a source resistor. The source resistance (RS) is determined from the load current (I

LOAD

) range, supply voltage (VS) variations,

SHUNT

, and desired quiescent current.

Choose the value of RSwhen VSis at a minimum and I

LOAD

is at a maximum. Maintain a minimum I

SHUNT

of 60µA at all times. The RSvalue should be large enough to keep I

SHUNT

less than 15mA for proper regulation when VSis

maximum and I

LOAD

is at a minimum. To prevent damage

to the device, I

SHUNT

should never exceed 20mA.

Therefore, the value of RSis bounded by the following equation:

S(MIN)

- VR] / [60µA + I

LOAD(MAX)

] > RS>

S(MAX)

- VR] / [20mA + I

LOAD(MIN)

]

Choosing a larger resistance minimizes the total power dissipation in the circuit by reducing the shunt current (P

D(TOTAL)

= V



SHUNT

). Provide a safety margin to incorporate the worst-case tolerance of the resistor used. Ensure that the resistor’s power rating is adequate, using the following general power equation:

PDR= I

SHUNT



S(MAX)

- V

SHUNT

)

Output Capacitance

The LM4050/LM4051 do not require external capacitors for frequency stability and are stable for any output capacitance.

Temperature Performance

The LM4050/LM4051 typically exhibit output voltage temperature coefficients within ±15ppm/°C. The polarity of the temperature coefficients may be different from one device to another; some may have positive coefficients, and others may have negative coefficients.

High Temperature Operation

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 dissipation 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 maximum junction temperature value of +150°C. For hightemperature operation, care must be taken to ensure the combination of ambient temperature, output power dissipation, and package thermal resistance does not conspire to raise the device temperature beyond that listed in the

Absolute Maximum Ratings

. Either reduce the output load current or the ambient temperature to keep the part within the limits.

Figure 3. Typical Operating Circuit

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 connected to pin 2.

+ I

SHUNT

LOAD

LM4050

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

12 ______________________________________________________________________________________

Ordering Information

PART

LM4050AEM3-2.1+T 2.048 0.1 50 -40°C to +125°C 3 SOT23 FZTR

LM4050AEX3-2.1+T 2.048 0.1 50 -40°C to +125°C 3 SC70 ASM

LM4050BEM3-2.1+T 2.048 0.2 50 -40°C to +125°C 3 SOT23 FZTS

LM4050BEX3-2.1+T 2.048 0.2 50 -40°C to +125°C 3 SC70 ASN

LM4050CEM3-2.1+T 2.048 0.5 50 -40°C to +125°C 3 SOT23 FZTT

LM4050CEX3-2.1+T 2.048 0.5 50 -40°C to +125°C 3 SC70 ASO

LM4050AEM3-2.5+T 2.500 0.1 50 -40°C to +125°C 3 SOT23 FZTU

LM4050AEX3-2.5+T 2.500 0.1 50 -40°C to +125°C 3 SC70 ASP

LM4050AEX3-2.5/V+T 2.500 0.1 50 -40°C to +125°C 3 SC70 +AUE

LM4050BEM3-2.5+T 2.500 0.2 50 -40°C to +125°C 3 SOT23 FZTV

LM4050BEX3-2.5+T 2.500 0.2 50 -40°C to +125°C 3 SC70 ASQ

LM4050CEM3-2.5+T 2.500 0.5 50 -40°C to +125°C 3 SOT23 FZTW

LM4050CEX3-2.5+T 2.500 0.5 50 -40°C to +125°C 3 SC70 ASR

LM4050AEM3-3.0+T 3.000 0.1 50 -40°C to +125°C 3 SOT23 FZTX

LM4050AEX3-3.0+T 3.000 0.1 50 -40°C to +125°C 3 SC70 ASS

LM4050BEM3-3.0+T 3.000 0.2 50 -40°C to +125°C 3 SOT23 FZTY

LM4050BEM3-3.0/V+T 3.000 0.2 50 -40°C to +125°C 3 SOT23 +FZVG

LM4050BEX3-3.0+T 3.000 0.2 50 -40°C to +125°C 3 SC70 AST

LM4050CEM3-3.0+T 3.000 0.5 50 -40°C to +125°C 3 SOT23 FZTZ

LM4050CEX3-3.0+T 3.000 0.5 50 -40°C to +125°C 3 SC70 ASU

LM4050AEX3-3.3+T 3.300 0.1 50 -40°C to +125°C 3 SC70 AOJ

LM4050AEX3-3.3/V+T 3.300 0.1 50 -40°C to +125°C 3 SC70 +AUE

LM4050BEX3-3.3+T 3.300 0.2 50 -40°C to +125°C 3 SC70 AOK

LM4050CEX3-3.3+T 3.300 0.5 50 -40°C to +125°C 3 SC70 AOL

LM4050AEM3-4.1+T 4.096 0.1 50 -40°C to +125°C 3 SOT23 FZUA

LM4050AEX3-4.1+T 4.096 0.1 50 -40°C to +125°C 3 SC70 ASV

LM4050BEM3-4.1+T 4.096 0.2 50 -40°C to +125°C 3 SOT23 FZUB

LM4050BEM3-4.1/V+T 4.096 0.2 50 -40°C to +125°C 3 SOT23 +FZVL

LM4050BEX3-4.1+T 4.096 0.2 50 -40°C to +125°C 3 SC70 ASW

LM4050CEM3-4.1+T 4.096 0.5 50 -40°C to +125°C 3 SOT23 FZUC

LM4050CEX3-4.1+T 4.096 0.5 50 -40°C to +125°C 3 SC70 ASX

LM4050AEM3-5.0+T 5.000 0.1 50 -40°C to +125°C 3 SOT23 FZUD

LM4050AEX3-5.0+T 5.000 0.1 50 -40°C to +125°C 3 SC70 ASY

LM4050BEM3-5.0+T 5.000 0.2 50 -40°C to +125°C 3 SOT23 FZUE

LM4050BEX3-5.0+T 5.000 0.2 50 -40°C to +125°C 3 SC70 ASZ

LM4050CEM3-5.0+T 5.000 0.5 50 -40°C to +125°C 3 SOT23 FZUF

LM4050CEM3-5.0/V+T 5.000 0.5 50 -40°C to +125°C 3 SOT23 +FZVM

LM4050CEX3-5.0+T 5.000 0.5 50 -40°C to +125°C 3 SC70 ATA

O U T PU T

VO L T A G E ( V)

I N I T I A L

A C C U R A C Y ( % )

TEMPCO

(ppm/_ C)

TEMP RANGE

PINPACKAGE

TOP

MARK

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage

References with Multiple Reverse Breakdown Voltages

______________________________________________________________________________________ 13

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages

. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

3 SOT23 U3+1

90-0179

3 SC70 X3+2

90-0208

PART

O U T PU T

I N I T I A L

TEMPCO

TEMP RANGE

PINPACKAGE

TOP

MARK

LM4051AEM3-1.2+T 1.225 0.1 50 -40°C to +125°C 3 SOT23 FZTO

LM4051AEX3-1.2+T 1.225 0.1 50 -40°C to +125°C 3 SC70 ASJ

LM4051BEM3-1.2+T

1.225

0.2 50 -40°C to +125°C 3 SOT23 FZTP

LM4051BEX3-1.2+T

1.225

0.2 50 -40°C to +125°C 3 SC70 ASK

LM4051CEM3-1.2+T

1.225

0.5 50 -40°C to +125°C 3 SOT23 FZTQ

LM4051CEX3-1.2+T

1.225

0.5 50 -40°C to +125°C 3 SC70 ASL

Ordering Information (continous)

VO L T A G E ( V)

A C C U R A C Y ( % )

(ppm/_ C)

21-0051

21-0075

LM4050/LM4051

50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION PAGES CHANGED

0 7/02 Initial release —

4 5/09

Added lead-free notation and corrected topmarks in the Ordering Information and Selector Guide sections

1, 12

5 5/11

Added automotive packages and updated the Absolute Maximum Ratings.

1, 2

6 9/11

Added automotive packages to Selector Guide and Ordering Information.

1, 12

MAXIM LM4050, LM4051 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual