MIC2007 datasheet(12/17 Pages) MICREL

12 / 17 page

Micrel

MIC2007/MIC2017

October 2005

M9999-102805

Enable

ENABLE is a HIGH true control signal, which activates

the main MOSFET switch. ENABLE will operate with

logic running from supply voltages as low as 1.8V, once

VIN has exceeded the UVLO threshold. ENABLE can be

wire-OR’d with other MIC2007/2017s or similar devices

without damage to the device.

ENABLE may be driven higher than VIN, but no higher

than 5.5V.

Slew Rate Control

Large capacitive loads can create significant current

surges when charged through a high-side switch such

the

MIC2007/2017.

For

this

reason,

the

MIC2007/2017 provides built-in slew rate control to limit

the initial inrush currents upon enabling the power

MOSFET switch.

Slew rate control is active upon powering up, and upon

re-enabling the load. At shutdown, the discharge slew

rate is controlled by the external load and output

capacitor.

On MIC2007/2017 slew rate is adjustable and can be

further reduced by adding an external capacitance

between VIN and the CSLEW pins.

Thermal Shutdown

Thermal

shutdown

employed to

protect

the

MIC2007/2017 from damage should the die temperature

exceed safe operating levels. Thermal shutdown shuts

off the output MOSFET if the die temperature reaches

145°C.

The MIC2007/2017 will automatically resume operation

when the die temperature cools down to 135°C. If

resumed operation results in reheating of the die, then

another

shutdown

cycle

will

occur

and

the

MIC2007/2017 will continue cycling between ON and

OFF states until the offending load has been removed.

Depending upon PCB layout, package type, ambient

temperature, etc., hundreds of milliseconds may elapse

from the incidence of a fault to the output MOSFET

being shut off. This delay is due to thermal time

constants within the system itself. In no event will the

device be damaged due to thermal overload because

die temperature is monitored continuously by on-chip

circuitry.

MIC2007 Datasheet(PDF) 12 Page - Micrel Semiconductor

MIC2007 Datasheet(HTML) 12 Page - Micrel Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Datasheet Download

Link URL