MIC5219 Datasheet, PDF(4/12 Page) Micrel Semiconductor

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MIC5219 Datasheet, PDF (4/12 Pages) Micrel Semiconductor – 500mA-Peak Output LDO Regulator

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MIC5219

Micrel

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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, TJ(max), the junction-to-ambient thermal resistance, Î¸JA, and the ambient temperature, TA. The maximum allowable power

dissipation at any ambient temperature is calculated using: PD(max) = (TJ(max) â TA) Ã· Î¸JA. Exceeding the maximum allowable power dissipa-

tion will result in excessive die temperature, and the regulator will go into thermal shutdown. See Table 1 and the âThermal Considerationsâ

section for details.

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

Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

range from 100ÂµA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

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.

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.

VEN is the voltage externally applied to devices with the EN (enable) input pin.

Thermal regulation is defined as the change in output voltage at a time âtâ after a change in power dissipation is applied, excluding load or line

regulation effects. Specifications are for a 500mA load pulse at VIN = 12V for t = 10ms.

CBYP is an optional, external bypass capacitor connected to devices with a BYP (bypass) or ADJ (adjust) pin.

MIC5219

July 2000

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