Refer to the PDF data sheet for device specific package drawings
The REF29xx is a precision, low-power, low-voltage dropout voltage reference family available in a tiny 3‑pin SOT-23 package.
The small size and low power consumption (50 µA maximum) of the REF29xx make it ideal for portable and battery-powered applications. The REF29xx does not require a load capacitor, but it is stable with any capacitive load.
Unloaded, the REF29xx can be operated with supplies within 1 mV of output voltage. All models are specified for the wide temperature range, –40°C to 125°C.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
REF29xx | SOT-23 (3) | 2.92 mm × 1.30 mm |
Changes from B Revision (February 2008) to C Revision
PRODUCT | VOLTAGE (V) |
---|---|
REF2912 | 1.25 |
REF2920 | 2.048 |
REF2925 | 2.5 |
REF2930 | 3 |
REF2933 | 3.3 |
REF2940 | 4.096 |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | IN | I | Input supply voltage |
2 | OUT | O | Reference output voltage |
3 | GND | — | Ground |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage, V+ to V– | 7 | V | ||
Output short circuit(2) | Continuous | °C | ||
Lead temperature (soldering, 10 s) | 300 | °C | ||
Operating temperature | –40 | 125 | °C | |
Junction temperature | 150 | °C | ||
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±4000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1500 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VIN | Input voltage | VREF + 0.05(1) | 5.5 | V |
ILOAD | Load current | 25 | mA | |
TA | Operating temperature | –40 | 125 | °C |
THERMAL METRIC(1) | REF29xx | UNIT | |
---|---|---|---|
DBZ (SOT-23) | |||
3 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 297.3 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 128.5 | °C/W |
RθJB | Junction-to-board thermal resistance | 91.7 | °C/W |
ψJT | Junction-to-top characterization parameter | 12.8 | °C/W |
ψJB | Junction-to-board characterization parameter | 90.3 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
REF2912 – 1.25 V | ||||||
VOUT | Output voltage | 1.225 | 1.25 | 1.275 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz, | 14 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 42 | µVrms | |||
Line regulation | 1.8 V ≤ VIN ≤ 5.5 V | 60 | 190 | µV/V | ||
REF2920 | ||||||
VOUT | Output voltage | 2.007 | 2.048 | 2.089 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz, | 23 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 65 | µVrms | |||
Line regulation | VREF + 50 mV ≤ VIN ≤ 5.5 V | 110 | 290 | µV/V | ||
REF2925 | ||||||
VOUT | Output voltage | 2.45 | 2.5 | 2.55 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz | 28 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 80 | µVrms | |||
Line regulation | VREF + 50 mV ≤ VIN ≤ 5.5 V | 120 | 325 | µV/V | ||
REF2930 | ||||||
VOUT | Output voltage | 2.94 | 3 | 3.06 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz, | 33 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 94 | µVrms | |||
Line regulation | VREF + 50 mV ≤ VIN ≤ 5.5 V | 120 | 375 | µV/V | ||
REF2933 | ||||||
VOUT | Output voltage | 3.234 | 3.3 | 3.366 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz, | 36 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 105 | µVrms | |||
Line regulation | VREF + 50 mV ≤ VIN ≤ 5.5 V | 130 | 400 | µV/V | ||
REF2940 | ||||||
VOUT | Output voltage | 4.014 | 4.096 | 4.178 | V | |
Initial accuracy | 2% | |||||
Output voltage noise | f = 0.1 Hz to 10 Hz, | 45 | µVPP | |||
Voltage noise | f = 10 Hz to 10 kHz | 128 | µVrms | |||
VREF + 50 mV ≤ VIN ≤ 5.5 V | 160 | 410 | µV/V | |||
REF2912, REF2920, REF2925, REF2930, REF2933, REF2940 | ||||||
dVOUT/dT | Output voltage temperature drift(2) | –40°C ≤ TA ≤ 125°C | 35 | 100 | ppm/°C | |
ILOAD | Output current | 25 | mA | |||
Long-term stability | 0 to 1000H | 24 | ppm | |||
1000 to 2000H | 15 | |||||
dVOUT/dILOAD | Load regulation(3) | 0 mA < ILOAD < 25 mA, VIN = VREF + 500 mV(1) |
3 | 100 | µV/mA | |
dT | Thermal Hysteresis(4) | 25 | 100 | ppm | ||
VIN – VOUT | Dropout voltage | 1 | 50 | mV | ||
ISC | Short-circuit current | 45 | mA | |||
Turnon settling time | to 0.1% at VIN = 5 V with CL = 0 | 120 | µs | |||
POWER SUPPLY | ||||||
VS | Voltage | IL = 0 | VREF + 0.001(5) | 5.5 | V | |
Voltage over temperature | –40°C ≤ TA ≤ 125°C | VREF + 0.05 | 5.5 | |||
IQ | Quiescent current | 42 | 50 | µA | ||
Quiescent current over temperature | –40°C ≤ TA ≤ 125°C | 59 | ||||
TEMPERATURE RANGE | ||||||
Specified range | –40 | 125 | °C | |||
Operating range | –40 | 125 | °C | |||
Storage range | –65 | 150 | °C | |||
RθJC | Thermal resistance for SOT-23 surface-mount | 110 | °C/W | |||
RθJA | 336 | °C/W |