LM2940 查看數據表（PDF） - Unspecified

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LM2940

1.25A High Current Low Dropout Voltage Regulator Adjustable

Unspecified 

LM2940/2941

ENABLE Input LM2941

Input Logic Voltage

Low (OFF)

High (ON)

V

0.8

2.4

Enable Pin

Input Current

Regulator Output

Current in Shutdown

VEN = 26V

VEN = 0.8V

(Note 10)

100

600

V

750

2.5

µA

5

10

µA

500

NOTES:

The Bold specifications apply to the full operating temperature range.

Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 26V.

Note 2: Full load current (IFL) is defined as 1.25A for the LM2941.

Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN.

Note 4: VIN = VOUT (NOMINAL) +1V. For example, use VIN= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.

Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.

Note 6: Output voltage temperature coefficient is defined as the worst case voltage changed divided by the total temperature range.

Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation

effects. Specifications are for a 200mA load pulse as VIN = 20V (a 4W pulse) for T = 10ms.

Note 8: VREF ≤ VOUT ≤ (VIN - 1), 2.3V ≤ VIN≤ 26V, 10mA < IL ≤ IFL, TJ ≤ TJMAX

Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express

these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of

5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remains constant as a percent of VOUT as VOUT is varied,

with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.

Note 10: VEN ≤ 0.8V and VIN≤ 26V, VOUT = 0.

BLOCK DIAGRAM

IN

FLAG

EN

+ 1.180V Reference 1.240V +

-

-

Thermal

Shutdown

O.V

ILIMIT

28V

OUT

R1*

ADJ

R2*

GND

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556

www.baylinear.com

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