ST LM4041AICT-1.2, LM4041BICT-1.2, LM4041CICT-1.2, LM4041DICT-1.2, LM4041AILT-1.2 User Manual

This is information on a product in full production.

July 2012 Doc ID 018817 Rev 3 1/16

16

LM4041xx

Precision micropower shunt voltage reference

Datasheet − production data

Features

■ Fixed 1.225 V typical output voltage

■ Ultra low operating current: 40 µA at 25 °C

■ High precision: +/- 0.1% @ 25 °C (0.2%, 0.5%

and 1% versions are also available)

■ Stable when used with capacitive loads

■ Industrial (- 40 to+ 85 °C) and Extended (- 40

to +125 °C) temperature range versions

available

■ 100 ppm/°C maximum temperature coefficient

■ Available in SOT23-3L and SOT323-5L

packages

Applications

■ Computers

■ Battery chargers

■ Switch mode power supply

■ Battery operated equipment

■ Data acquisition systems

■ Energy management

■ Instrumentation

Description

The LM4041 is a micropower shunt voltage

reference, providing a stable 1.225 V output

voltage, with an initial accuracy of 0.1% @ 25 °C

and a low temperature coefficient. Available in

SOT323-5L and SOT23-3L surface mount

packages, it can be designed in applications

where space saving is a critical issue. The low

operating current is a key advantage for power

restricted designs. In addition, the LM4041 is very

stable and can be used in a broad range of

application conditions.

SOT23-3L

SOT323-5L

www.st.com

Contents LM4041xx

2/16 Doc ID 018817 Rev 3

Contents

1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

LM4041xx Pin configuration

Doc ID 018817 Rev 3 3/16

1 Pin configuration

* This pin must be left floating or connected to Anode pin.

Figure 1. Pin connection (top view)

AM09377v1

AM09

378v1

SOT23-3L SOT323-5L

Maximum ratings LM4041xx

4/16 Doc ID 018817 Rev 3

2 Maximum ratings

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these conditions is not implied.

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

I

K

Reverse breakdown current 20 mA

I

F

Forward current 10 mA

P

D

Power dissipation

(1)

SOT23-3L

SOT323-5L

500

536

mW

T

STG

Storage temperature - 65 to +150 °C

ESD

Human Body Model (HBM) 2 kV

Machine Model (MM) 200 V

Charged Device Model 1500 V

T

LEAD

Lead temperature (soldering) 10 sec 260 °C

T

J

Max junction temperature +150 °C

1. P

D

has been calculated with T

AMB

= 25°C and T

JMAX

= 150 °C.

Table 2. Thermal data

Symbol Parameter SOT323-5L SOT23-3L Unit

R

thJA

Thermal resistance junction-ambient 233 248 °C/W

R

thJC

Thermal resistance junction-case 90 136 °C/W

Table 3. Operating conditions

Symbol Parameter Value Unit

I

KMIN

Minimum operating current 40 µA

I

KMAX

Maximum operating current 12 mA

T

OPER

Operating free air temperature range

Industrial - 40 to + 85

°C

Extended - 40 to + 125

LM4041xx Electrical characteristics

Doc ID 018817 Rev 3 5/16

3 Electrical characteristics

T

AMB

= 25 °C, unless otherwise specified.

Note: Limits are 100% production tested at 25 °C. Limits over temperature are guaranteed through

correlation and by design.

Table 4. Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

k

Reverse breakdown

voltage

I

k

= 100 µA

LM4041A, 0.1%

LM4041B, 0.2%

LM4041C, 0.5%

LM4041D, 1%

1.2238

1.2225

1.219

1.213

1.225

1.2262

1.2275

1.231

1.237

V

I

kmin

Minimum operating

current

T

amb

= 25 °C 25 40

µA

-40 °C < T

amb

< T

max

(1)

50

ΔV

k

/ΔT

Average temperature

coefficient

(2)

I

k

= 100 µA ± 36 ± 100 ppm/°C

ΔV

k

/ΔI

k

Reverse breakdown

voltage change with

operating current range

I

kmin

< I

k

< 1 mA

- 40 °C < T

amb

< T

max

(1)

0.4

1

1.5

mV

1 mA < I

k

< 12 mA

- 40 °C < T

amb

< T

max

(1)

4

8

10

R

ka

Static impedance ΔI

k

= 100 µA to 1 mA 0.4 1 Ω

K

vh

Long term stability I

k

= 100 µA, t = 1000 hrs 120 ppm

e

n

Wide band noise I

k

= 100 µA, 10 Hz < f < 10 kHz 60 µV

RMS

1. T

max

= 85 °C for LM4041xI (industrial version) and T

max

= 125 °C for LM4041xE (extended version).

2. The average temperature coefficient is defined as: 10

6

x {max(ΔV

k

) / [V

k@25°C

x (T

max

-T

min

)]} [ppm/°C].