MIC2940A/2941A

Micrel

MIC2940A/2941A

4

June 1999

Parameter

Conditions

Min

Typical

Max

Units

Reference Voltage

1.223

1.235

1.247

V

1.210

1.260

V max

Reference Voltage

(Note 8)

1.204

1.266

V

Adjust Pin

20

40

nA

Bias Current

60

Reference Voltage

20

ppm/

°C

Temperature

Coefficient

Adjust Pin Bias

0.1

nA/

°C

Current Temperature

Coefficient

Shutdown Input

Input Logic Voltage

1.3

V

Low (ON)

0.7

High (OFF)

2.0

Shutdown Pin

V

SHUTDOWN

= 2.4V

30

50

µA

Input Current

100

V

SHUTDOWN

= 26V

450

600

µA

750

Regulator Output

(Note 10)

330

µA

Current in Shutdown

60

Note 1:

Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not

apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the

maximum junction temperature, T

allowable power dissipation at any ambient temperature is calculated using: P

power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.

Note 2:

Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.

Note 3:

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.

Note 4:

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 minimum input supply voltage of 4.3V over temperature must

be taken into account.

Note 5:

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.

Note 6:

The MIC2940A features fold-back current limiting. The short circuit (V

normal output voltage.

Note 7:

Thermal regulation is defined as the change in 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 at V

Note 8:

V

V

(V

IN

– 1 V), 4.3V

≤ V

26V, 5mA < I

1.25A, T

Note 9:

Circuit of Figure 3 with R1

≥ 150kΩ. V

2 V and V

26 V,V

OUT

= 0.

Note 10: 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.

Note 11: Maximum positive supply voltage of 60 V must be of limited duration (< 100 ms) and duty cycle (

≤ 1%). The maximum continuous

supply voltage is 26V.