MIC2941AWT datasheet(6/24 Pages) MICROCHIP

6 / 24 page

MIC2940A/41A

DS20006000B-page 6



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Shutdown Input

Input Logic Voltage

VIL

—

1.3

0.7

Low (ON)

VIH

2.0

—

High (OFF)

Shutdown Pin Input Current

ISHDN

—

µA

VSHUTDOWN = 2.4V

—

100

—

450

600

VSHUTDOWN = 26V

—

750

Regulator Output Current in

Shutdown

IOUT(SHDN)

—

µA

Note 8

—

Note 1: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total

temperature range.

2: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in

output voltage due to heating effects are covered by the thermal regulation specification.

3: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV

below its nominal value measured at 1V differential. At low values of programmed output voltage, the min-

imum input supply voltage of 4.3V over temperature must be taken into account.

4: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum

of the load current plus the ground pin current.

5: The MIC2940A features fold-back current limiting. The short-circuit (VOUT = 0V) current-limit is less than

the maximum current with normal output voltage.

6: Thermal regulation is defined as the change in output voltage at a time (T) after a change in power dissi-

pation is applied, excluding load or line regulation effects. Specifications are for a 200 mA load pulse at

VIN = 20V (a 4W pulse) for T = 10 ms.

7: VREF ≤ VOUT ≤ (VIN – 1 V), 4.3V ≤ VIN 26V, 5 mA < IL ≤ 1.25A, TJ ≤ TJ(MAX).

8: When used in dual supply systems where the regulator load is returned to a negative supply, the output

voltage must be diode clamped to ground.

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics: Limits in standard typeface are for TJ = +25°C and limits in boldface apply over the full

operating temperature range. Unless otherwise specified, VIN = VOUT + 1V, IL = 1000 mA, CL = 10 μF. The MIC2941A

is programmed to output 5V and has VSHUTDOWN 0.6V.

Parameter

Symbol

Min.

Typ.

Max.

Units

Conditions

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