Remote Antenna Current-Sense

Amplifier and Switches

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7

switch is zero (see Figure 1). If the load current is

time have fixed values of 100ms (min) and 1500ms

(min), respectively.

Short-to-Battery Detection

It may happen that OUT is shorted to the battery due to

a fault in the system. The MAX16913/MAX16913A

detect this failure by comparing the OUT voltage and

the IN voltage before the switch turns on. Every time

the switch turns on, such as at the end of the retry time,

or once the thermal shutdown condition disappears,

the short-to-battery detection is performed. At this

point, if the device detects any failure, the switch stays

off, and both

SC and OL assert low (see Table 1).

Thermal Shutdown

Thermal shutdown circuitry protects the devices from

overheating. The switch turns off immediately when the

junction temperature exceeds +150°C (min) (see Table

1). The switch turns on again after the device tempera-

ture drops by approximately 15°C (typ).

Shutdown (SHDN)

The MAX16913/MAX16913A feature an active-high con-

trol input (SHDN) to put the devices in a low-power shut-

down mode. The devices turn off and consume only 5µA

(max) of shutdown current when SHDN is driven high.

RETRY

TURN-ON INTO A HARD SHORT CIRCUIT

LOAD CURRENT

SHDN

SC

RETRY

TURN-ON INTO A TEMPORARY SHORT CIRCUIT

LOAD CURRENT

SHDN

SC

Figure 1. Short-Circuit Timing Diagram