MIC2940 Просмотр технического описания (PDF) - Micrel

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производитель

MIC2940

1.25A Low-Dropout Voltage Regulator

Micrel 

MIC2940A/2941A

Electrical Characteristics (MIC2941A Only)

Parameter

Conditions

Reference Voltage

Reference Voltage

Adjust Pin

Bias Current

Reference Voltage

Temperature

Coefficient

Adjust Pin Bias

Current Temperature

Coefficient

Shutdown Input

Input Logic Voltage

Shutdown Pin

Input Current

(Note 8)

Low (ON)

High (OFF)

VSHUTDOWN = 2.4V

VSHUTDOWN = 26V

Regulator Output

Current in Shutdown

(Note 10)

Micrel

Min Typical Max

Units

1.223

1.210

1.204

1.235

20

20

1.247

1.260

1.266

40

60

V

V max

V

nA

ppm/°C

0.1

nA/°C

1.3

V

0.7

2.0

30

50

µA

100

450

600

µA

750

3

30

µA

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, TJ , (MAX) the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum

allowable power dissipation at any ambient temperature is calculated using: P(MAX) = (TJ(MAX) – TA) / θJA. Exceeding the maximum allowable

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 (VOUT = 0V) current limit is less than the maximum current with

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

Note 8: VREF ≤ VOUT ≤ (VIN – 1 V), 4.3V ≤ VIN ≤ 26V, 5mA < IL ≤ 1.25A, TJ ≤ TJ MAX.

Note 9: Circuit of Figure 3 with R1 ≥ 150kΩ. VSHUTDOWN ≥ 2 V and VIN ≤ 26 V,VOUT = 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.

MIC2940A/2941A

4

June 1999

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