Current Limit

Output current is limited to 210mA (typ). The current

limit exceeds the 100mA (min) safe operating limit. The

output can be shorted to ground for 30 seconds without

damaging the part.

Thermal-Overload Protection

an internal thermal sensor sends a signal to the shut-

down logic, turning off the pass transistor and allowing

the IC to cool. The thermal sensor turns the pass tran-

sistor on again after the IC’s junction temperature cools

by 20°C (typ), causing the output to pulse on and off

during continuous thermal-overload conditions.

Operating Region and Power Dissipation

Maximum power dissipation depends on the thermal

resistance of the case and circuit board, the tempera-

ture difference between the die junction and ambient

air, and the rate of airflow. The device’s power dissipa-

+70°C ambient is 1951mW (see the Absolute Maximum

High-Voltage, Low-Power Linear Regulators for

Notebook Computers

8

_______________________________________________________________________________________

5/3

(MAX8718)

FB

(MAX8719)

SHDN

BIAS

REF

CURRENT

LIMIT

IN

OUT

MAX8718

MAX8719

GND

PGOOD

DELAY

THRESHOLD

THERMAL

SHUTDOWN

Figure 3. MAX8718/MAX8719 Functional Diagram