LM4050 datasheet(8/15 Pages) NSC

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LM4050-10.0

Electrical Characteristics

Boldface limits apply for T

A =TJ =TMIN to TMAX; all other limits TA =TJ = 25˚C. The grades A, B and C designate initial

Reverse Breakdown Voltage tolerances of ±0.1% and ±0.2% and 0.5% respectively.

Symbol

Parameter

Conditions

Typical

(Note 4)

LM4050AIM3

LM4050AEM3

Limits

(Note 5)

LM4050BIM3

LM4050BEM3

Limits

(Note 5)

LM4050CIM3

LM4050CEM3

Limits

(Note 5)

Units

(Limit)

Reverse Breakdown Voltage

IR = 150 µA

10.00

Reverse Breakdown Voltage

Tolerance (Note 6)

IR = 150 µA

±10

±20

±50

mV (max)

Industrial Temp. Range

±43

±53

±83

mV (max)

Extended Temp. Range

±60

±70

±100

mV (max)

IRMIN

Minimum Operating Current

µA

100

µA (max)

Industrial Temp. Range

103

µA (max)

Extended Temp. Range

110

µA (max)

∆VR/∆T

Average Reverse Breakdown

Voltage Temperature Coefficient

(Note 6)

IR =10 mA

±40

ppm/˚C

IR =1 mA

±20

ppm/˚C

IR = 150 µA

±20

±50

ppm/˚C (max)

∆VR/∆IR

Reverse Breakdown Voltage

Change with Operating Current

Change (Note 7)

IRMIN ≤ IR ≤ 1 mA

0.8

1.5

mV (max)

3.5

mV (max)

1mA

≤ IR ≤ 15 mA

8.0

12.0

mV (max)

23.0

mV (max)

Reverse Dynamic Impedance

IR = 1 mA, f = 120 Hz,

0.7

Ω

IAC = 0.1 IR

Wideband Noise

IR = 150 µA

150

µVrms

10 Hz

≤ f ≤ 10 kHz

∆VR

Reverse Breakdown Voltage

Long Term Stability

t = 1000 hrs

T = 25˚C ±0.1˚C

120

ppm

IR = 150 µA

VHYST

Thermal Hysteresis

(Note 8)

∆T = −40˚C to 125˚C

2.8

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

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

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: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to

ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax =(TJmax −TA)/θJA or the

number given in the Absolute Maximum Ratings, whichever is lower. For the LM4050, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted,

is 326˚C/W for the SOT-23 package.

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

directly into each pin.

Note 4: Typicals are at TJ = 25˚C and represent most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.

The limits are used to calculate National’s AOQL.

Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

±[(

∆V R/∆T)(max∆T)(VR)]. Where, ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25˚C to

T MIN or TMAX, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where

max

∆T = 65˚C is shown below:

A-grade: ±0.425% = ±0.1% ±50 ppm/˚C x 65˚C

B-grade: ±0.525% = ±0.2% ±50 ppm/˚C x 65˚C

C-grade: ±0.825% = ±0.5% ±50 ppm/˚C x 65˚C

Therefore, as an example, the A-grade LM4050-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of ±2.5V x 0.425% = ±11 mV.

Note 7: Load regulation is measured on pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into

account separately.

Note 8: Thermal hysteresis is defined as the difference in voltage measured at +25˚C after cycling to temperature -40˚C and the 25˚C measurement after cycling

to temperature +125˚C.

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