MIC5237-2.5BU datasheet(3/8 Pages) MICREL

3 / 8 page

January 2000

MIC5237

Micrel

Electrical Characteristics

IN = VOUT + 1.0V; COUT = 4.7µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

OUT

Output Voltage Accuracy

variation from nominal V

OUT

–3

–5

∆V

OUT/∆T

Output Voltage

Note 2

ppm/

°C

Temperature Coefficient

∆V

OUT/VOUT

Line Regulation

IN = VOUT + 1V to 16V

0.05

%/V

0.015

0.1

%/V

∆V

OUT/VOUT

Load Regulation

OUT = 100µA to 500mA, Note 3

0.05

0.5

0.7

IN – VOUT

Dropout Voltage, Note 4

OUT = 100µA10

OUT = 50mA

115

190

280

OUT = 150mA

165

350

450

OUT = 500mA

300

600

700

GND

Ground Pin Current, Note 5

OUT = 100µA80

130

µA

170

µA

OUT = 50mA

350

650

µA

900

µA

OUT = 150mA

1.8

2.5

3.0

OUT = 500mA

PSRR

Ripple Rejection

f = 120Hz

LIMIT

Current Limit

OUT = 0V

700

900

1000

∆V

OUT/∆PD

Thermal Regulation

Note 6

0.05

%/W

Output Noise

OUT = 5.0V, IOUT = 50mA,

500

nV/ Hz

OUT = 2.2µF

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

J(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

D(max) = (TJ(max) –TA) ÷ θJA. Exceeding the maximum allowable power dissipa-

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

IN = 16V for t = 10ms.

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