MAX890L 데이터 시트보기 (PDF) - Maxim Integrated

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MAX890L

1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown

Maxim Integrated 

1.2A, Current-Limited, High-Side

P-Channel Switch with Thermal Shutdown

MAX890L

SET

RSET

GND

Figure 2. Setting the Current Limit

Thermal Shutdown

The MAX890L features thermal shutdown. The switch

turns off when the junction temperature exceeds

+135°C. Once the device cools by 10°C, the switch

turns back on. If the fault short-circuit condition is not

removed, the switch cycles on and off, resulting in a

pulsed output.

Fault Indicator

The MAX890L provides a fault output (FAULT). This

open-drain output goes low when in current limit or

when the die temperature exceeds +135°C. A 100kΩ

pull-up resistor from FAULT to IN provides a logic-

control signal.

Applications Information

Input Capacitor

To limit the input voltage drop during momentary output

short-circuit conditions, connect a capacitor from IN to

GND. A 1µF ceramic capacitor is adequate for most

applications; however, higher capacitor values further

reduce the voltage drop at the input.

Output Capacitor

Connect a 0.1µF capacitor from OUT to GND. One

function of this capacitor is to prevent inductive para-

sitics from pulling OUT negative during turn-off.

Layout and Thermal-Dissipation

Consideration

To take full advantage of the switch-response time to

output short-circuit conditions, it is very important to

keep all traces as short as possible to reduce the effect

of undesirable parasitic inductance. Place input and

output capacitors as close as possible to the device

(no more than 5mm).

Under normal operating conditions, the package can

dissipate and channel heat away. Calculate the maxi-

mum power as follows:

P = I2LIMIT x RON

where RON is the on-resistance of the switch.

When the output is short circuited, the voltage drop

across the switch equals the input supply. Hence, the

power dissipated across the switch increases, as does

the die temperature. If the fault condition is not

removed, the thermal-overload-protection circuitry turns

the switch off until the die temperature falls by 10°C. A

ground plane in contact with the device helps dissipate

additional heat.

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maxim-ic.com/packages. Note that a

“+”, “#”, or “-” in the package code indicates RoHS status only.

Package drawings may show a different suffix character, but the

drawing pertains to the package regardless of RoHS status.

PACKAGE

TYPE

8 SO

PACKAGE

CODE

S8+5

OUTLINE

LAND

NO. PATTERN NO.

21-0041

90-0096

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