Datasheet SPX385-2.5 Datasheet (Sipex)

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SPX385-2.5

Micropower V oltage Reference

FEATURES

■ Trimmed Bandgap............................ 1% and 2%

■ Wide Operating Current ...............20µA to 20mA

■ Extended Temperature Range... -40°C to +85°C

■ Dynamic Impedance .............................. 1Ω max

■ Offered in SOT-23, TO-92, SOIC, and SOT-89

■ Improved Replacement for LM185/285/385-2.5V,

AS385-2.5

■ Low Cost Solution

APPLICATIONS

■ Battery Operating Equipment

■ Adjustable Supplies

■ Switching Power Supplies

■ Error Amplifiers

■ Single Supply Amplifier

■ Monitors / VCR / TV

■ Personal Computers

The SPX385-2.5 is a micropower 2-terminal band-gap voltage reference with a very wide
operating current range from 20µA to 20mA that provides a stable voltage. The high stability of
this device is primarily the result of the low temperature coefficient Thin Film Resistor process and
Laser Trimming of the output voltage at the wafer level.

The SPX385-2.5 is available in a SOT-23, TO-92, SOIC-8 and SOT-89 package with an operating
temperature range of -40°C to 85°C. A 1.2 and 5 volt device is also available - SPX385-1.2 and
SPX385-5.

Refer to page 4 for pinouts.

Cathode (K)

Cathode

N/C

SPX385

3 Pin SOT-23

Anode

DESCRIPTION

BLOCK DIAGRAM

500k

+

-

500k

1.25V

Figure 1: Block Diagram

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

Anode (A)

1

ABSOLUTE MAXIMUM RATINGS

Stresses greater than 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 these or any other conditions
above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.

Reverse Current (I
Forward Current (I
Operating Temperature Range (T

Junction Temperature (TJ) .....................................................150°C

Storage Temperature (T
Lead Temperature (Soldering 10 sec.), T

) ............................................................. 30mA

KA

) ............................................................. 10mA

AK

) ............................ -40 to +85°C

A

) ....................................... - 65 to 150°C

STG

.............................300°C

L

TYPICAL THERMAL RESISTANCES

PACKAGE 0JA 0JC TYPICAL DERATING

TO-92 160°C/W 80°C/W 6.3 mW/°C
SOT-23 575°C/W 150°C/W 1.7 mW/°C
SOIC-8 175°C/W 45°C/W 5.7 mW/°C
SOT-89 110°C/W 8°C/W 9.1 mW/°C

Typical deratings of the thermal resistances are
given for ambient temperature >25°.

IIN = 100µA, TA = 25°C, unless otherwise specified.

SPX385A-2.5 SPX385-2.5

PARAMETER CONDITIONS MIN. TYP. MAX MIN. TYP. MAX. UNIT

Reference Voltage 2.475 2.500 2.525 2.450 2.500 2.550 V
Dynamic Output F = 20Hz 0.6 1.0 0.6 1.0 Ω

Impedance IR = 100µA
Reference Voltage 20µA ≤ IR ≤ 20mA 10 20 10 20 mV

Change with IR.
Temperature Coefficient Note 1 60 100 60 100 ppm/°C
Minimum Operating Current 15 20 15 20 µA
Output Wideband Noise 10Hz ≤ f ≤ 10kHz 120 120 µVrms
Long Term Stability T=1000Hr; 60 60 ppm

TA = 25°C ±0.1°C

Operating Temperature -40 +85 -40 +85 °C

Note 1. Three-point measurement guarantees the error band over the specified temperature range.

*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)

mV

%

ppm

000

ELECTRICAL CHARACTERISTICS

DV

KA

D

-10

0.55000

0153045607590105

Junction Temperature (°C)

TC in mV/°C=

TC in%/°C=

TC in ppm/°C=

DVKA(mV)

DT

A

DV

KA

()

DVKAat 25°C

DVKAat 25°C

()

x 100

DT

A

DV

KA

DT

6

x10

A

0.07 mV/°C

0.003 %/°C
27 ppm/°C

Figure 2. VKA vs. Temperature

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

2

V

IN

Figure 3. Test Circuit

TYPICAL PERFORMANCE CHARACTERISTICS

30

V

25

Temperature Range: 0°C to 85°C

V

KA

I

K

20

15

10

5

0

-5

- Cathode Current (mA)

K

I

-10

-15

-20

-2 -1 012 3

Figure 4. High Current Operating Characteristics

KA

VKA - Cathode Voltage (V)

2.53

IK = 10mA

2.52

2.51

2.50

V

= 2.500V at 25°C

2.49

- Voltage (V)

KA

2.48

V

2.47

2.46

2.45

REF

90 120-60 -30 0 30 60

TA - Ambient Temperature (°C)

Figure 5. Reference Voltage vs. Ambient Temperature

* I

OUT

-1.5V to -27V

2.5V

=

R2

R1

68k

2

–

LM312

3

+

I

*

OUT

SPX385-2.5

7

4

C1

150pF

R2

6

Figure 6. Low Current Operating Characteristics

1.5V to 27V

45

30

15

- Cathode Current (µA)

K

I

0

-1.0 0 1.0 2.0 3.0

85°C

25°C

-0°C

VKA - Cathode Voltage (V)

2.5V

=

* I

OUT

R2

R1

68k

30V

2

–

SPX385-2.5

150pF

7

LM312

3

+

4

I

*

OUT

C1

6

R2

-30V

Figure 7a. Precision 1µA to 1mA Current Sink

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

Figure 7b. Precision 1µA to 1mA Current Source

3

TYPICAL PERFORMANCE CHARACTERISTICS

9V

V

IN

LM338

375

5V

200k

SPX385-2.5

120

Figure 8. Improving Regulation of Adjustable Regula­tors

VIN = 3.7V to 30V

LM334

3.3k
OUT

2.5V

SPX385-2.5

Figure 10. Wide Input Range Reference

2.5V

SPX385-2.5

Figure 9. Micropower Reference from 9V Battery

I

Q

V

= 15V

IN

500k

7

2

SPX385-2.5

+

3

-

LM4250C

4

6

8

22M

IQ ≅ 30µA Standby Current

150pF

1.5M

500k

Figure 11: Precision Micropower 10V Reference

10V

PACKAGE PINOUTS

8-Pin NSOIC

N/C

N/C

N/C

ANODE

1

2

3

4

Top View

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

8

7

N/C

6

5

CATHODE

N/C

N/C

SOT-23-3 (M)

3

N/C

1

CATHODE

Top View

2

ANODE

SOT-89 (M1)

1

2

ANODE CATHODE

N/C

Top View

TO-92 (N)

132

3

N/C

CATHODE

Bottom View

4

ANODE

PACKAGE: 3 PIN SOT-23

D

b

3

1

e1

3 PIN SOT-23

A

A1

A2
b

c
D
e

e1

E
E1

L
L2
Ø

e

2

Dimensions in (mm)
MIN NOM MAX

- - 1.25

0 - 0.10

1.050 1.100 1.150

0.36 0.38 0.45

0.15 - 0.20

2.901 2.926 2.951

0.925 0.950 0.975

1.850 1.900 1.950

2.700 2.800 2.900

1.601 1.626 1.651

0.37 0.45 0.53

- - 0.05

0º - 8º

B

B

EE1

A

A

A

WITH PLATING

c

BASE METAL

A1

VIEW A-A

VIEW C

A2

b

SECTION B-B

SEE VIEW C

SEE VIEW D

L

SIDE VIEW

Gauge Plane
Seating Plane

Ø

Seating Plane

C

L2

VIEW D

3 PIN SOT-23

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

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PACKAGE: 3 PIN SOT-89

D

3

D1

1

e

e1

Dimensions in (mm)

A

b

b1
C
D
D1
E

e

e1
H

L

Ø1.0

E

2

3 PIN SOT-89
LINGSEN #
PO-SOT-004

MIN NOM MAX

1.40 1.50 1.60

0.36 0.42 0.48

0.41 0.47 0.53

0.38 0.40 0.43

4.40 4.50 4.60

1.40 1.60 1.75

2.40 2.50 2.60

1.45 1.50 1.55

2.90 3.00 3.10

3.94 - 4.25

0.80 - 1.20

H

5’(2x)

C

B’(2x)

RO.15

bb1

b

3 PIN SOT-89

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

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PACKAGE: 8 PIN NSOIC

D

e

E/2

E1

E

INDEX AREA
(D/2 X E1/2)

1

TOP VIEW

A

Minimum/Maximum

A2

A1

DIMENSIONS

(mm)

COMMON HEIGHT DIMENSION

SYMBOL MIN NOM MAX

A
A1
A2
b
c

1.35

0.10

1.25

0.31

0.17 0.25

D

E
E1

e
L

0.40
L1
L2
Ø
Ø1

0º
5º

A

SIDE VIEW

8 Pin NSOIC

(JEDEC MS-012,

AA - VARIATION)

1.75

-

- 0.25

-

1.65

-

0.51

-

4.90 BSC

6.00 BSC

3.90 BSC

1.27 BSC

-

1.27

1.04 REF

0.25 BSC

-

8º

-

15º

E1/2

b

Ø1

Seating Plane

Ø1

SEE VIEW C

L

L1

L2

Gauge Plane

Ø

VIEW C

SEATING PLANE

WITH PLATING

b

c

BASE METAL

CONT ACT AREA

PACKAGE:

8 PIN NSOIC

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

7

PACKAGE: 3 PIN TO-92

L

e

b

e1

DIMENSIONS

Minimum/Maximum

(mm)

COMMON HEIGHT DIMENSION

W

3 PIN TO-92

CARSEM DWG #

TLG920001

SYMBOL MIN NOM MAX

A

b

E

e

e1

L

R

S1

W
D

∂

-

4.32

- 0.51

0.36

-

3.30

2.41

-

-

1.14 1.40

12.70

2.16

-

-

1.14 1.52

-

-

0.41

-

4.45
4º

-

4.95

3.94

2.67

15.49

2.41

0.56

4.95
6º

D

A

S1

R

E

∂(2x)

3 PIN TO-92

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

8

ORDERING INFORMATION

Part Number Accuracy Output Voltage Package Type

SPX385AM-2.5 1.0% 2.5V 3-Pin SOT-23
SPX385AM-2.5/TR 1.0% 2.5V 3-Pin SOT-23
SPX385AM1-2.5 1.0% 2.5V 3-Pin SOT-89
SPX385AM1-2.5/TR 1.0% 2.5V 3-Pin SOT-89
SPX385AS-2.5 1.0% 2.5V 8-Pin NSOIC
SPX385AS-2.5/TR 1.0% 2.5V 8-Pin NSOIC
SPX385AN-2.5 1.0% 2.5V 3-Pin TO-92
SPX385AN-2.5/TR 1.0% 2.5V 3-Pin TO-92
SPX385M-2.5 2.0% 2.5V 3-Pin SOT-23
SPX385M-2.5/TR 2.0% 2.5V 3-Pin SOT-23
SPX385M1-2.5 2.0% 2.5V 3-Pin SOT-89
SPX385M1-2.5/TR 2.0% 2.5V 3-Pin SOT-89
SPX385S-2.5 2.0% 2.5V 8-Pin NSOIC
SPX385S-2.5/TR 2.0% 2.5V 8-Pin NSOIC
SPX385N-2.5 2.0% 2.5V 3-Pin TO-92
SPX385N-2.5/TR 2.0% 2.5V 3-Pin TO-92

/TR = Tape and Reel
Pack quanity is 2000 for TO-92 and
2500 for SOT-23, SOT-89 and NSOIC.
.

ANALOG EXCELLENCE

Sipex Corporation

Headquarters and
Sales Office:

233 Hillview Dr
Milpitas, CA 95035
TEL: [phone]
FAX: [phone]

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

Date:05/21/04 SPX385-2.5 Micropower Voltage Reference © Copyright 2004 Sipex Corporation

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