Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - voltage reference Series Adjustable SOT 23-3

REF2912

REF2920

REF2925

REF2930

REF2933

REF2940

SBVS033B – JUNE 2002 – REVISED FEBRUARY 2008

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DESCRIPTION

The REF29xx is a precision, low-power, low-voltage dropout

voltage reference family available in a tiny SOT23-3.

The REF29xx small size and low power consumption (50µA

max) make it ideal for portable and battery-powered applica-

tions. The REF29xx does not require a load capacitor, but is

stable with any capacitive load.

Unloaded, the REF29xx can be operated with supplies within

1mV of output voltage. All models are specified for the wide

temperature range, –40°C to +125°C.

FEATURES

●

Micro

SIZE PACKAGE: SOT23-3

● LOW DROPOUT: 1mV

● HIGH OUTPUT CURRENT: 25mA

● LOW TEMPERATURE DRIFT: 100ppm/

°C max

● HIGH ACCURACY: 2%

● LOW I

: 50µA max

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

100ppm/°C, 50µA in SOT23-3

CMOS VOLTAGE REFERENCE

APPLICATIONS

● PORTABLE, BATTERY-POWERED EQUIPMENT

● DATA ACQUISITION SYSTEMS

● MEDICAL EQUIPMENT

● HAND-HELD TEST EQUIPMENT

PRODUCT VOLTAGE (V)

REF2912 1.25

REF2920 2.048

REF2925 2.5

REF2930 3.0

REF2933 3.3

REF2940 4.096

1IN

2OUT

3 GND

REF2912

REF2920

REF2925

REF2930

REF2933

REF2940

SOT23-3

DROPOUT VOLTAGE vs LOAD CURRENT

350

300

250

200

150

100

Dropout Voltage (mV)

0 5 10 15 20 25 30

Load Current (mA)

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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.

Summary of content (16 pages)

PAGE 1
REF2912 REF2920 REF2925 REF2930 REF2933 REF2940 www.ti.com SBVS033B – JUNE 2002 – REVISED FEBRUARY 2008 100ppm/°C, 50µA in SOT23-3 CMOS VOLTAGE REFERENCE FEATURES DESCRIPTION ● MicroSIZE PACKAGE: SOT23-3 The REF29xx is a precision, low-power, low-voltage dropout voltage reference family available in a tiny SOT23-3.
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ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage, V+ to V– ................................................................... 7.0V Output Short-Circuit(2) .............................................................. Continuous Operating Temperature .................................................. –40°C to +125°C This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions.
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ELECTRICAL CHARACTERISTICS (Cont.) 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. REF29xx PARAMETER CONDITIONS MIN TYP MAX UNITS 2.940 3.0 3.06 2 V % REF2930 OUTPUT VOLTAGE Initial Accuracy VOUT NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 33 94 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 120 375 µV/V 3.30 3.
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TYPICAL CHARACTERISTICS At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted. LINE REGULATION vs TEMPERATURE OUTPUT IMPEDANCE vs FREQUENCY 100 150 Output Impedance (dB) Line Regulation (µV/V) 200 100 50 0 –50 10 1 0.1 0.01 –40 –20 0 20 40 60 80 100 120 1 140 10 100 Temperature (°C) POWER-SUPPLY REJECTION RATIO vs FREQUENCY 2.50138 80 2.50000 70 2.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF2925 is used for typical characteristics, unless otherwise noted. 1-25mA LOAD TRANSIENT (CL = 1µF) 0.1Hz TO 10Hz NOISE IL = 25mA 10µV/div 20mV/div IL = 1mA VOUT 1.
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THEORY OF OPERATION 42.5 42.0 IQ (µA) The REF29xx is a series, CMOS, precision bandgap voltage reference. Its basic topology is shown in Figure 1. The transistors Q1 and Q2 are biased such that the current density of Q1 is greater than that of Q2. The difference of the two base-emitter voltages, Vbe1 – Vbe2, has a positive temperature coefficient and is forced across resistor R1. This voltage is gained up and added to the base-emitter voltage of Q2, which has a negative coefficient.
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NOISE PERFORMANCE The REF29xx generates noise less than 50µVPP between frequencies of 0.1Hz to 10Hz, and can be seen in the Typical Characteristic Curve, 0.1 to 10Hz Voltage Noise. The noise voltage of the REF29xx increases with output voltage and operating temperature. Additional filtering may be used to improve output noise levels, although care should be taken to ensure the output impedance does not degrade ac performance.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 8-Feb-2008 ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jul-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) REF2912AIDBZR SOT-23 DBZ 3 3000 179.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.15 2.95 1.22 4.0 8.0 Q3 REF2912AIDBZT SOT-23 DBZ 3 250 179.0 8.4 3.15 2.95 1.22 4.0 8.0 Q3 REF2920AIDBZR SOT-23 DBZ 3 3000 179.0 8.4 3.15 2.95 1.22 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jul-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) REF2912AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF2912AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.0 REF2920AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF2920AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.0 REF2925AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF2925AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.