MIC68400YML datasheet(10/15 Pages) MICREL

Part #	MIC68400YML

Description	4A Sequencing LDO with Tracking and Ramp Control?

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

MIC68400

September 2007

10

M9999-090607-C

Applications Information

Enable Input

The MIC68400 features a TTL/CMOS compatible

positive logic enable input for on/off control of the

device. High (>1V) enables the regulator while low

(<.2V) disables the regulator. In shutdown the

regulator consumes very little current (only a few

microamperes of leakage). For simple applications the

enable (EN) can be connected to VIN (IN). While

MIC68400 only requires a few µA’s of enable current

to turn on, actual enable pin current will depend on the

overdrive (enable voltage exceeding 1V) in each

particular application.

Control Logic

High > 1V

Enable Connections for Logic Driven Input

Enable Connection for VIN-Driven

and/or Slow Rise-Time Inputs

Input Capacitor

An

input

capacitor

of

0.1µF

or

greater

is

recommended when the device is more than 4 inches

away from the bulk supply capacitance, or when the

supply is a battery. Small, surface mount chip capac-

itors can be used for the bypassing. The capacitor

should be place within 1 inch of the device for optimal

performance. Larger values will help to improve ripple

rejection by bypassing the regulator input, further

improving the integrity of the output voltage.

Output Capacitor

The MIC68400 requires an output capacitor for stable

operation. As a µCap LDO, the MIC68220 can

operate with ceramic output capacitors of 10µF or

greater with ESR’s ranging from a 3m

Ω to over

300m

Ω. Values of greater than 10µF improve trans-

ient response and noise reduction at high frequency.

X7R/X5R dielectric-type ceramic capacitors are

recommended because of their superior temperature

performance. X7R-type capacitors change capaci-

tance by 15% over their operating temperature range

and are the most stable type of ceramic capacitors.

Larger output capacitances can be achieved by

placing tantalum or aluminum electrolytics in parallel

with the ceramic capacitor. For example, a 100µF

electrolytic in parallel with a 10µF ceramic can provide

the transient and high frequency noise performance of

a 100µF ceramic at a significantly lower cost. Specific

undershoot/overshoot performance will depend on

both the values and ESR/ESL of the capacitors.

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