Texas Instruments REF3112, REF3120, REF3125, REF3130, REF3133 Schematic [ru]

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REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

SBVS046C – DECEMBER 2003 – REVISED FEBRUARY 2006

15ppm/° C Max, 100 A, SOT23-3

SERIES VOLTAGE REFERENCE

FEATURES

●MicroSIZE PACKAGE: SOT23-3

●LOW DROPOUT: 5mV

●HIGH OUTPUT CURRENT: ± 10mA

●HIGH ACCURACY: 0.2% max

●LOW IQ: 115 A max

●EXCELLENT SPECIFIED DRIFT PERFORMANCE:

15ppm/° C (max) from 0° C to +70° C 20ppm/° C (max) from –40C° to +125° C

DESCRIPTION

The REF31xx is a family of precision, low power, low dropout, series voltage references available in the tiny SOT23-3 package.

The REF31xx’s small size and low power consumption (100 A typ) make it ideal for portable and battery-powered applications. The REF31xx does not require a load capacitor, but is stable with any capacitive load and can sink/source up to 10mA of output current.

Unloaded, the REF31xx can be operated on supplies down to 5mV above the output voltage. All models are specified for the wide temperature range of –40° C to +125° C.

APPLICATIONS

● PORTABLE, BATTERY-POWERED EQUIPMENT					PRODUCT	VOLTAGE (V)
● DATA ACQUISITION SYSTEMS					REF3112	1.25
● DATA ACQUISITION SYSTEMS					REF3120	2.048
● MEDICAL EQUIPMENT					REF3120	2.048
● MEDICAL EQUIPMENT					REF3125	2.5
● HAND-HELD TEST EQUIPMENT					REF3130	3.0
					REF3133	3.3
					REF3140	4.096
IN	1	REF3112
		REF3120
		REF3125
		REF3125	3	GND
		REF3130	3	GND


OUT	2	REF3133
OUT	2	REF3140

		SOT23-3

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.	Copyright © 2003-2006, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
	www.ti.com

ABSOLUTE MAXIMUM RATINGS(1)

Supply Voltage, V+ to V–	................................................................... 7.0V
Output Short-Circuit .................................................................	Continuous
Operating Temperature ..................................................	–55 ° C to +135° C
Storage Temperature .....................................................	–65 ° C to +150° C
Junction Temperature ....................................................................	+150° C

NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these, or any other conditions beyond those specified, is not implied.

PACKAGE/ORDERING INFORMATION(1)

ELECTROSTATIC DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

			SPECIFIED
		PACKAGE	TEMPERATURE	PACKAGE	ORDERING	TRANSPORT
PRODUCT	PACKAGE-LEAD	DESIGNATOR	RANGE	MARKING	NUMBER	MEDIA, QUANTITY

REF3112	SOT23-3	DBZ	–40° C to +125° C	R31A	REF3112AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3112AIDBZR	Tape and Reel, 3000
REF3120	SOT23-3	DBZ	–40° C to +125° C	R31B	REF3120AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3120AIDBZR	Tape and Reel, 3000
REF3125	SOT23-3	DBZ	–40° C to +125° C	R31C	REF3125AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3125AIDBZR	Tape and Reel, 3000
REF3130	SOT23-3	DBZ	–40° C to +125° C	R31E	REF3130AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3130AIDBZR	Tape and Reel, 3000
REF3133	SOT23-3	DBZ	–40° C to +125° C	R31F	REF3133AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3133AIDBZR	Tape and Reel, 3000
REF3140	SOT23-3	DBZ	–40° C to +125° C	R31D	REF3140AIDBZT	Tape and Reel, 250
"	"	"	"	"	REF3140AIDBZR	Tape and Reel, 3000

NOTE: (1) (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com.

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, TA = –40° C to +125° C.

At TA = +25° C, ILOAD = 0mA, VIN = 5V, unless otherwise noted.

			REF31xx

PARAMETER	CONDITIONS	MIN	TYP	MAX	UNITS

		REF3112(1)	- 1.25V
OUTPUT VOLTAGE	VOUT			1.2475	1.25	1.2525	V
Initial Accuracy				–0.2		0.2	%

NOISE
Output Voltage Noise		f = 0.1Hz to 10Hz			17		VPP
Voltage Noise		f = 10Hz to 10kHz			24		Vrms
		REF3120 –2.048
OUTPUT VOLTAGE	VOUT			2.0439	2.048	2.0521	V
Initial Accuracy				–0.2		0.2	%

NOISE
Output Voltage Noise		f = 0.1Hz to 10Hz			27		VPP
Voltage Noise		f = 10Hz to 10kHz			39		Vrms

		REF3125 –2.5V
OUTPUT VOLTAGE	VOUT			2.4950	2.50	2.5050	V
Initial Accuracy				–0.2		0.2	%

NOISE
Output Voltage Noise		f = 0.1Hz to 10Hz			33		VPP
Voltage Noise		f = 10Hz to 10kHz			48		Vrms

2	REF3112, 3120, 3125, 3130, 3133, 3140

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SBVS046C

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, TA = –40° C to +125° C.

At TA = +25° C, ILOAD = 0mA, VIN = +5V, unless otherwise noted.

			REF31xx

PARAMETER	CONDITIONS	MIN	TYP	MAX	UNITS

REF3130 –3.0V

OUTPUT VOLTAGE

VOUT

2.9940

3.0

3.0060

Initial Accuracy

–0.2

0.2

NOISE

Output Voltage Noise

f = 0.1Hz to 10Hz

VPP

Voltage Noise

f = 10Hz to 10kHz

Vrms

REF3133 –3.3V

OUTPUT VOLTAGE

VOUT

3.2934

3.30

3.3066

Initial Accuracy

–0.2

0.2

NOISE

Output Voltage Noise

f = 0.1Hz to 10Hz

VPP

Voltage Noise

f = 10Hz to 10kHz

Vrms

REF3140 –4.096V

OUTPUT VOLTAGE

VOUT

4.0878

4.096

4.1042

Initial Accuracy

–0.2

0.2

NOISE

Output Voltage Noise

f = 0.1Hz to 10Hz

VPP

Voltage Noise

f = 10Hz to 10kHz

Vrms

REF3112, REF3120, REF3125, REF3130, REF3133, REF3140

OUTPUT VOLTAGE TEMP DRIFT(2)

/dT

OUT

0° C ≤

TA ≤

+70°C

ppm/°C

–40° C ≤ TA ≤

+125° C

ppm/°C

LONG-TERM STABILITY

0-1000h

ppm

LINE REGULATION

VREF + 0.05(1) ≤

VIN ≤ 5.5V

ppm/V

LOAD REGULATION(3)

dVOUT/dILOAD

V/mA

Sourcing

0mA < ILOAD < 10mA,

= V

REF

+ 250mV(1)

V/mA

Sinking

–10mA < ILOAD < 0mA,

= V

REF

+ 100mV(1)

THERMAL HYSTERESIS(4)

First Cycle

100

ppm

Additional Cycles

ppm

DROPOUT VOLTAGE(1)

– V

OUT

OUTPUT CURRENT

ILOAD

–10

SHORT-CIRCUIT CURRENT

ISC

Sourcing

Sinking

TURN-ON SETTLING TIME

to 0.1% at VIN = +5V with CL = 0

400

POWER SUPPLY

IL = 0

Voltage

V + 0.05(1)

5.5

REF

Quiescent Current

100

115

Over Temperature

115

135

TEMPERATURE RANGE

Specified Range

–40

+125

° C

Operating Range

–55

+135

° C

Storage Range

–65

+150

° C

Thermal Resistance

SOT23-3 Surface-Mount

θ JA

336

° C/W

NOTES: (1) Minimum supply voltage for REF3112 is 1.8V.

(2)Box Method used to determine temperature drift.

(3)Typical value of load regulation reflects measurements using force and sense contacts; see the Load Regulation section.

(4)Thermal hysteresis is explained in more detail in the Applications Information section of this data sheet.

(5)For IL > 0, see the Typical Characteristic curves.

REF3112, 3120, 3125, 3130, 3133, 3140	3

SBVS046C

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Texas Instruments REF3112, REF3120, REF3125, REF3130, REF3133 Schematic

TYPICAL CHARACTERISTICS

At TA

Percentage of Units

= +25° C, VIN = +5V power supply, REF3125 is used for typical characteristics, unless

TEMPERATURE DRIFT (0° C to +70° C)

18
18
16
16
14																Unitsof
14
12
12
10																Percentage
10
8
8
6
6
4
4
2
2
0
0
0	1	2	3	4	5	6	8	9	10	11	12	13	14	15	16
						Drift (ppm/° C)

otherwise noted.

TEMPERATURE DRIFT (–40° C to +125° C)

0	1	2	3	4	5	6	7	8	9	10 11 12 13 14 15 16 17 18 19 20 21
								Drift (ppm/° C)

Output Drift (%)

OUTPUT VOLTAGE vs TEMPERATURE

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

−0.02

−0.04

− 60 − 40 − 20 0	20 40 60 80 100 120 140
	Temperature (° C)

Dropout Voltage (mV)

DROPOUT VOLTAGE vs LOAD CURRENT

120

100

–15	–10	–5	0	5	10	15
		Load Current (mA)

Quiescent Current (µ A)

QUIESCENT CURRENT vs TEMPERATURE

120

100

–60	–40	–20	0	20	40	60	80	100	120	140
				Temperature (° C)

Output Resistance (Ω )

OUTPUT IMPEDANCE vs FREQUENCY

100

0.1

0.01

1	10	100	1k	10k	100k	1M
			Frequency (Hz)

4	REF3112, 3120, 3125, 3130, 3133, 3140

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SBVS046C

TYPICAL CHARACTERISTICS (Cont.)

At TA

Power-Supply Rejection Ratio (dB)

= +25° C,

VIN = +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted.

	PSRR vs FREQUENCY													OUTPUT vs SUPPLY
							2.505
							2.505		+125				C

							2.504				°


						(V)	2.503
							2.503
							2.502

						Output
						Output	2.501
							2.501			+25	°	C
							2.500

										− 40	°	C
							2.499


							2.498
10	100		1k	10k	100k		2.498
10	100		1k	10k	100k		2.0	2.5		3.0				3.5	4.0	4.5	5.0	5.5	6.0	6.5
		Frequency (Hz)													Supply (V)

Output Voltage (V)

OUTPUT VOLTAGE vs LOAD CURRENT

2.505
2.505					+125° C
2.504					+125° C


2.503
2.503
2.502
2.502
2.501
2.501					+25° C
2.500					+25° C
2.500					− 40° C
2.499					− 40° C
2.499
2.498
2.498
2.497
2.497

–15	–10	–5	0	5	10	15
		Load Current (mA)

0.1Hz TO 10Hz NOISE

10 V/div

400ms/div

STEP RESPONSE, CL = 0, 5V STARTUP

5V/div	VIN

1V/div	VOUT

100µ s/div

REF3112 LONG TERM STABILITY

		20
		0
	(ppm)	–20
	(ppm)	–40
		–40
	Drift	–60
		–60
		–80
		–100
		–120

0	100	200	300	400	500	600	700	800	900	1000
				Time (Hrs)

REF3112, 3120, 3125, 3130, 3133, 3140	5

SBVS046C

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