The MIC5219 is an efcient linear voltage regulator with high
peak output current capability, very-low-dropout voltage, and
better than 1% output voltage accuracy. Dropout is typically
10mV at light loads and less than 500mV at full load.
The MIC5219 is designed to provide a peak output current for
start-up conditions where higher inrush current is demanded.
It features a 500mA peak output rating. Continuous output
current is limited only by package and layout.
The MIC5219 can be enabled or shut down by a CMOS or
TTL compatible signal. When disabled, power consumption
drops nearly to zero. Dropout ground current is minimized to
help prolong battery life. Other key features include reversedbattery protection, current limiting, overtemperature shutdown,
and low noise performance with an ultra-low-noise option.
The MIC5219 is available in adjustable or xed output voltages in the space-saving 6-pin (2mm × 2mm) MLF®, 6-pin
(2mm × 2mm) Thin MLF® SOT-23-5 and MM8® 8-pin power
MSOP packages. For higher power requirements see the
MIC5209 or MIC5237.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Enable Input Logic-Low Voltage VEN = logic low (regulator shutdown) 0.4 V
V
ENL
0.18
V
Enable Input Current V
I
ENL
V
V
I
ENH
= logic high (regulator enabled) 2.0 V
EN
≤ 0.4V 0.01 –1 µA
ENL
≤ 0.18V 0.01 –2 µA
ENL
≥ 2.0V 2 5 20 µA
ENH
25
June 2009 4 M0371-061809
Micrel, Inc. MIC5219
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specications 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, θ
temperature is calculated using: PD(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. See Table 1 and the “Thermal Considerations” section for details.
2. The device is not guaranteed to function outside its operating rating.
3. Specication for packaged product only.
4. Output voltage temperature coefcient is dened as the worst case voltage change divided by the total temperature range.
5. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range
from 100µA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specication.
6. Dropout voltage is dened as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.
7. 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.
is the voltage externally applied to devices with the EN (enable) input pin.
8. V
EN
9. Thermal regulation is dened as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation effects. Specications are for a 500mA load pulse at V
10. C
is an optional, external bypass capacitor connected to devices with a BYP (bypass) or ADJ (adjust) pin.
BYP
, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient
JA
= 12V for t = 10ms.
IN
June 2009 5 M0371-061809
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