LM4041CEM3-1.2+ - Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

General Description

The LM4041 is a precision two-terminal shunt mode,

bandgap voltage reference with a fixed reverse break-

down voltage of 1.225V. Ideal for space-critical appli-

cations, the LM4041 is offered in the subminiature 3-pin

SC70 surface-mount package (1.8mm ✕1.8mm), 50%

smaller than comparable devices in SOT23 surface-

mount packages (SOT23 versions are also available).

Laser-trimmed resistors ensure precise initial accuracy.

With a 100ppm/°C temperature coefficient, the device

is offered in four grades of initial accuracy ranging from

0.1% to 1%. The LM4041 has a 60µA to 12mA shunt

current capability with low dynamic impedance, ensur-

ing stable reverse-breakdown voltage accuracy over a

wide range of operating temperatures and currents.

The LM4041 does not require an external stabilizing

capacitor while ensuring stability with any capacitive

load.

The LM4041 is guaranteed over the temperature range

-40°C to +125°C.

________________________Applications

Portable, Battery-Powered Equipment

Notebook Computers

Cell Phones

Industrial Process Controls

Features

♦Ultra-Small 3-Pin SC70 Package

♦0.1% (max) Initial Accuracy

♦100ppm/°C (max) Temperature Coefficient

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

Range

♦Wide Operating Current Range: 60µA to 12mA

♦Low 20µVRMS Output Noise (10Hz to 10kHz)

♦1.225V Fixed Reverse Breakdown Voltage

♦No Output Capacitors Required

♦Tolerates Capacitive Loads

LM4041

Improved Precision Micropower

Shunt Voltage Reference

________________________________________________________________ Maxim Integrated Products 1

3N.C.*

LM4041

SC70-3/SOT23-3

TOP VIEW

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

PART

INITIAL

ACCURACY

(%)

OUTPUT

VOLTAGE

(V)

TEMPCO

(ppm/°C)

LM4041A___-1.2-T 0.1 1.225 100

LM4041B___-1.2-T 0.2 1.225 100

LM4041C___-1.2-T 0.5 1.225 100

LM4041D___-1.2-T 1.0 1.225 150

Pin Configuration

Selector Guide

19-1704; Rev 4; 7/05

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

LM4041AIX3-1.2-T

-40°C to +85°C 3 SC70-3

ABF

LM4041AIM3-1.2-T

-40°C to +85°C

3 SOT23-3

FZEB

LM4041AEX3-1.2-T

-40°C to +125°C

3 SC70-3

ALB

LM4041AEM3-1.2-T

-40°C to +125°C 3 SOT23-3

FZNC

LM4041BIX3-1.2-T

-40°C to +85°C 3 SC70-3

ABG

LM4041BIM3-1.2-T

-40°C to +85°C

3 SOT23-3

FZEC

LM4041BEX3-1.2-T

-40°C to +125°C

3 SC70-3

ALC

LM4041BEM3-1.2-T

-40°C to +125°C 3 SOT23-3

FZND

LM4041CIX3-1.2-T

-40°C to +85°C 3 SC70-3

ABH

LM4041CIM3-1.2-T

-40°C to +85°C

3 SOT23-3

FZED

LM4041CEX3-1.2-T

-40°C to +125°C

3 SC70-3

ALD

LM4041CEM3-1.2-T

-40°C to +125°C 3 SOT23-3

FZNE

LM4041DIX3-1.2-T

-40°C to +85°C 3 SC70-3

ABI

LM4041DIM3-1.2-T

-40°C to +85°C

3 SOT23-3

FZEE

LM4041DEX3-1.2-T

-40°C to +125°C

3 SC70-3

ALE

LM4041DEM3-1.2-T

-40°C to +125°C 3 SOT23-3

FZNF

*See Selector Guide for a listing of LM4041 Output Voltage,

Initial Accuracy, and Temperature Coefficient specifications.

LM4041

Improved Precision Micropower

Shunt Voltage Reference

2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(IR= 100µA, TA= TMIN to TMAX, 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 (TA= +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

LM4041_I_ _ _..................................................-40°C to +85°C

LM4041_E_ _ _ ..............................................-40°C to +125°C

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

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LM4041A (0.1%)

1.2238 1.2250 1.2262

LM4041B (0.2%)

1.2226 1.2250 1.2275

LM4041C (0.5%)

1.2189 1.2250 1.2311

Reverse Breakdown Voltage VRTA = +25°C

LM4041D (1.0%)

1.2128 1.2250 1.2373

LM4041A (0.1%)

±1.2 ±9.2

LM4041B (0.2%)

±2.4 ±10.4

LM4041C (0.5%)

±6.0

±14

Reverse Breakdown Voltage

Tolerance (Note 2) ∆VR

LM4041D (1.0%) ±12 ±24

LM4041A/B/C 45 60

Minimum Operating Current

IRMIN

LM4041D 45 65 µA

IR = 10mA ±20

LM4041A/B/C ±15

±100

IR = 1mA LM4041D ±15

±150

Average Reverse Voltage

Temperature Coefficient

(Notes 2 and 3)

∆VR/∆T

IR = 100µA±15

ppm/°C

LM4041A/B/C 0.7 1.5

IRMIN ≤ IR ≤ 1mA LM4041D 0.7 2.0

LM4041A/B/C 2.5 8.0

Reverse Breakdown Voltage

Change with Operating

Current Change

∆VR/∆IR

1mA ≤ IR ≤ 12mA LM4041D 2.5

10.0

LM4041A/B/C 0.5 1.5

Reverse Dynamic

Impedance (Note 3) ZRIR = 1mA, f = 120Hz,

IAC = 0.1IRLM4041D 0.5 2.0 Ω

LM4041

Improved Precision Micropower

Shunt Voltage Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(IR= 100µA, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: All devices are 100% production tested at +25°C and are guaranteed by design for TA= TMIN to TMAX, as specified.

Note 2: The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse

Breakdown Voltage Tolerance ±[(∆VR/ ∆T)(max∆T)(VR)], where ∆VR/ ∆T is the VRtemperature coefficient, max∆T is the

maximum difference in temperature from the reference point of +25°C to TMIN or TMAX, and VRis the reverse breakdown

voltage. The total overtemperature tolerance for the different grades in the temperature range where max∆T = +65°C is

shown below:

A grade: ±0.75% = ±0.1% ±100ppm/°C ✕65°C

B grade: ±0.85% = ±0.2% ±100ppm/°C ✕65°C

C grade: ±1.15% = ±0.5% ±100ppm/°C ✕65°C

D grade: ±1.98% = ±1.0% ±150ppm/°C ✕65°C

The total overtemperature tolerance for the different grades in the extended temperature range where max∆T = +100°C is

shown below:

A grade: ±1.1% = ±0.1% ±100ppm/°C ✕100°C

B grade: ±1.2% = ±0.2% ±100ppm/°C ✕100°C

C grade: ±1.5% = ±0.5% ±100ppm/°C ✕100°C

D grade: ±2.5% = ±1.0% ±150ppm/°C ✕100°C

Therefore, as an example, the A-grade LM4041-1.2 has an overtemperature reverse breakdown voltage tolerance of ±2.5V

x 0.75% = ±19mV.

Note 3: Guaranteed by design.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 20

µVRMS

Reverse Breakdown Voltage

Long-Term Stability ∆VRT = 1000h, IR = 100µA120

ppm

TEMPERATURE DRIFT

LM4041 toc02

TEMPERATURE (°C)

REFERENCE VOLTAGE CHANGE (mV)

1007550250-25

-2

-1

-3

-50 125

REVERSE VOLTAGE vs. CURRENT

LM4041 toc03

SOURCE CURRENT (mA)

REVERSE VOLTAGE CHANGE (mV)

15105

020

TA = +25°C

TA = -40°C

TA = +125°C

TA = +85°C

Typical Operating Characteristics

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

100

0 0.80.4 1.2 1.6 2.0

REVERSE CHARACTERISTICS AND

MINIMUM OPERATING CURRENT

LM4041-01

REVERSE VOLTAGE (V)

REVERSE CURRENT (µA)

LM4041

Improved Precision Micropower

Shunt Voltage Reference

4_______________________________________________________________________________________

100 10k1k 100k 1M

OUTPUT IMPEDANCE vs. FREQUENCY

LM4041-08

FREQUENCY (Hz)

IMPEDANCE (Ω)

1000

0.1

100

C1 = 0

IR =

C1 = 1µF

IR = 1mA

150µA

10,000

100

10 1k 10k

1000

FREQUENCY (Hz)

100

NOISE vs. FREQUENCY

LM4041-09

IR = 200µA

NOISE (nV/√Hz)

RS = 30kΩ

SEE FIGURE 2

0841216

STARTUP CHARACTERISTICS

LM4041-07

RESPONSE TIME (µs)

VIN

1.5V

1.0V

VOUT

O.5V

VGEN

(AC-COUPLED)

2V/div

2mV/div

LOAD-TRANSIENT RESPONSE

LM4041-05

10µs/div

ISHUNT = 1mA ± 250µA,

RL = 10kΩ

SEE FIGURE 1

VGEN

2V/div

2mV/div

LOAD-TRANSIENT RESPONSE

LM4041-06

10µs/div

ISHUNT = 10mA ± 2.5mA,

RL = 1kΩ

SEE FIGURE 1

VGEN

(AC-COUPLED)

2V/div

2mV/div

LOAD-TRANSIENT RESPONSE

LM4041-04

10µs/div

ISHUNT = 100µA ± 25µA,

RL = 100kΩ

SEE FIGURE 1

Typical Operating Characteristics (continued)

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

30kΩ

VIN

1Hz RATE VR

Figure 2. Startup Characteristics Test Circuit

1kΩ

ISHUNT

VGEN

Figure 1. Load-Transient Test Circuit

Detailed Description

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.

Applications Information

The LM4041’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 RSwhen VSis at a minimum and

ILOAD is at a maximum. Maintain a minimum ISHUNT of

60µA at all times. The RSvalue should be large enough

to keep ISHUNT less than 12mA for proper regulation

when VSis maximum and ILOAD is at a minimum. To

prevent damage to the device, ISHUNT should never

exceed 20mA.

Therefore, the value of RSis 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✕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:

PR= ISHUNT ✕(VS(MAX) - VR)

Output Capacitance

The LM4041 does not require an external capacitor for

frequency stability and is stable for any output capaci-

tance.

Temperature Performance

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.

LM4041

Improved Precision Micropower

Shunt Voltage Reference

_______________________________________________________________________________________ 5

Pin Description

NAME

FUNCTION

1+Positive Terminal of the Shunt Reference

2−Negative Terminal of the Shunt Reference

3N.C. Leave this pin unconnected, or connect to pin 2.

Figure 3. Typical Operating Circuit

LM4041

ILOAD

ISHUNT

ISHUNT + ILOAD

LM4041

High Temperature Operation

The maximum junction temperature of the LM4041 is

+150°C. The maximum operating temperature for the

LM4041_E_ is +125°C. At a maximum load current of

15mA and a maximum output voltage of 5V, the part

will 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 part will selfheat to 35.56°C above

ambient temperature. If the ambient temperature is

+125°C, the part operates at 159.56°C, thereby

exceeding the maximum junction temperature value of

+150°C. For high-temperature operation, care must be

taken to ensure the combination of ambient tempera-

ture, output power dissipation, and package thermal

resistance does not conspire to raise the device tem-

perature 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.

Improved Precision Micropower

Shunt Voltage Reference

6_______________________________________________________________________________________

Chip Information

TRANSISTOR COUNT: 60

PROCESS: BiCMOS

LM4041

Improved Precision Micropower

Shunt Voltage Reference

_______________________________________________________________________________________ 7

SOTPO3L.EPS

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information

go to www.maxim-ic.com/packages.)

LM4041

Improved Precision Micropower

Shunt Voltage Reference

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.

8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

SC70, 3L.EPS

PACKAGE OUTLINE, 3L SC70

21-0075

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information

go to www.maxim-ic.com/packages.)