LM4121 datasheet(4/16 Pages) NSC

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Electrical Characteristics

LM4121-ADJ Unless otherwise specified V

IN = 3.3V, VOUT =VREF,ILOAD =0, COUT = 0.01µF, TA =Tj = 25˚C. Lim-

its with standard typeface are for T

j = 25˚C, and limits in boldface type apply over the −40˚C ≤ TA ≤ +85˚C temperature

range.

Symbol

Parameter

Conditions

Min (Note 5)

Typ (Note 4)

Max (Note 5)

Units

OUT =VREF

Output Voltage Initial

Accuracy

LM4121A-ADJ

1.216

±0.2

LM4121-ADJ

±0.5

TCV

REF/˚C

Temperature Coefficient

−40˚C

≤ T

A ≤ +125˚C

ppm/˚c

∆V

REF/∆VIN

Line Regulation

1.8V

≤ V

IN ≤ 12V

0.0007

0.009

0.012

%/V

∆V

OUT/∆ILOAD

Load Regulation

0mA

≤ I

LOAD ≤ 1 mA

0.03

0.08

0.17

%/mA

1mA

≤ I

LOAD ≤ 5 mA

0.01

0.04

0.1

−1 mA

≤ I

LOAD ≤ 0 mA

0.04

0.12

−5 mA

≤ I

LOAD ≤ −1 mA

0.01

Min-V

Minimum Operating Voltage

LOAD =5mA

1.5

1.8

Output Noise Voltage (Note 6)

0.1 Hz to 10 Hz

µV

10 Hz to 10 kHz

µV

RMS

Supply Current

160

250

275

µA

Power-down Supply Current

IN = 12V

Enable = 0.4V

Enable = 0.2V

µA

BIAS

Reference Pin Bias Current

(Note 7)

Logic High Input Voltage

1.6

1.5

Logic Low Input Voltage

0.4

0.2

Logic High Input Current

µA

Logic Low Input Current

0.1

µA

Short Circuit Current

OUT =0

630

IN = 12V, VOUT =0

630

Hyst

Thermal Hysteresis

(Note 8)

−40˚C

≤ T

A ≤ 125˚C

0.5

mV/V

∆V

OUT

Long Term Stability

(Note 9)

1000 hrs. @ 25˚C

100

ppm

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-

anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction

temperature),

θJ-A (junction to ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX =(TJMAX

−TA)/θJ-A up to the value listed in the Absolute Maximum Ratings.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. The machine model is a 200 pF capacitor discharged di-

rectly into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).

Note 6: Output noise for 1.25V option. Noise is proportional to VOUT.

Note 7: Bias Current flows out of the Adjust pin.

Note 8: Thermal hysteresis is defined as the change in +25˚C output voltage before and after exposing the device to temperature extremes.

Note 9: Long term stability is change in VREF at 25˚C measured continuously during 1000 hrs.

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