January 2000

3

MIC5237

MIC5237

Micrel

Electrical Characteristics

V

Symbol

Parameter

Conditions

Min

Typical

Max

Units

V

OUT

Output Voltage Accuracy

variation from nominal V

OUT

–3

3

%

–5

5

%

∆V

Output Voltage

Note 2

40

ppm/

°C

Temperature Coefficient

∆V

Line Regulation

V

0.05

%/V

0.015

0.1

%/V

∆V

Load Regulation

I

0.05

0.5

%

0.7

%

V

Dropout Voltage, Note 4

I

70

mV

90

mV

I

115

190

mV

280

mV

I

165

350

mV

450

mV

I

300

600

mV

700

mV

I

GND

Ground Pin Current, Note 5

I

130

µA

170

µA

I

350

650

µA

900

µA

I

1.8

2.5

mA

3.0

mA

I

8

15

mA

20

mA

PSRR

Ripple Rejection

f = 120Hz

75

dB

I

LIMIT

Current Limit

V

700

900

mA

1000

∆V

Thermal Regulation

Note 6

0.05

%/W

e

no

Output Noise

V

500

nV/ Hz

C

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 operating ratings. The maximum allowable power dissipation is a function of the maximum junction

temperature, T

dissipation at any ambient temperature is calculated using: P

tion will result in excessive die temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” section for

details.

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. Parts are tested for load regulation in the load

range from 100

µA to 500mA. 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 2% below its nominal value measured at 1V

differential.

Note 5:

Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of

the load current plus the ground pin current.

Note 6:

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 500mA load pulse at V