Shutdown (shdn) – Rainbow Electronics MAX16913A User Manual

Page 7

MAX16913/MAX16913A

Remote Antenna Current-Sense

Amplifier and Switches

_______________________________________________________________________________________

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

, but does not reach the 2 x I

thresh-

old, the t

BLANK

timer still begins counting (see Figure

2). The resistor across IN and SENS sets I

to a typi-

cal value of 100mV/R

SENSE

(Ω). Blanking time and retry

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

BLANK

TURN-ON INTO A HARD SHORT CIRCUIT

LOAD CURRENT

2 x I

SHDN

RETRY

BLANK

TURN-ON INTO A TEMPORARY SHORT CIRCUIT

LOAD CURRENT

2 x I

SHDN

Figure 1. Short-Circuit Timing Diagram