MIC29150 datasheet(5/20 Pages) MICREL

5 / 20 page

March 2000

MIC29150/29300/29500/29750

Micrel

Notes

Note 1:

Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (

≤1%). The maximum continuous supply

voltage is 26V.

Note 2:

Full Load current (I

FL) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families.

Note 3:

Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with V

OUT + 1V applied

to V

Note 4:

IN = VOUT (nominal) + 1V. For example, use VIN = 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to

minimize temperature rise.

Note 5:

Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground

pin current.

Note 6:

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

Note 7:

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 200mA load pulse at V

IN = 20V (a 4W pulse) for T = 10ms.

Note 8:

REF ≤ VOUT ≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 26V, 10mA < IL ≤ IFL, TJ ≤ TJ MAX.

Note 9:

Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at

6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V

OUT /VREF = (R1 + R2)/R2. For

example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.240 V = 384

mV. Thresholds remain constant as a percent of V

OUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal,

7.7% guaranteed.

Note 10: V

EN ≤ 0.8V and VIN ≤ 26V, VOUT = 0.

Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to

ground.

Block Diagram

Reference

28V

O.V.

ILIMIT

Thermal

Shut-

down

1.240V

1.180V

FLAG

GND

OUT

ADJ†

R1*

R2*

* Feedback network in fixed versions only

†

Adjustable version only

Typical Applications

Figure 1. Fixed output voltage.

Figure 2. Adjustable output voltage configuration. For

best results, the total series resistance should be small

enough to pass the minimum regulator load current.

MIC29500-3.3

± 5%

47µF

3.3V

± 1% @ 5A

VOUT = 1.240V × [1 + (R1 / R2)]

VIN

VOUT

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