MAX16913(2015) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX16913
(Rev.:2015)

Remote Antenna Current-Sense Amplifier and Switches

Maxim Integrated 

MAX16913/MAX16913A

Remote Antenna Current-Sense

Amplifier and Switches

TURN-ON INTO A HARD SHORT CIRCUIT

2 x ISC

ISC

LOAD CURRENT

tBLANK

SHDN

SC

tRETRY

RETRY

TURN-ON INTO A TEMPORARY SHORT CIRCUIT

2 x ISC

ISC

LOAD CURRENT

tBLANK

tRETRY

SHDN

RETRY

SC

Figure 1. Short-Circuit Timing Diagram

Short Circuit

If the load current reaches the short-circuit current

threshold (ISC), the tBLANK timer begins counting. During

this period, the load current is limited to a value of

twice the short-circuit current threshold (2 x ISC). If the

short-circuit condition is present for tBLANK, SC asserts

low and the internal switch turns off. The timer resets if

the short-circuit condition disappears before the blanking

time (tBLANK) has elapsed. If the switch is turned off at the

end of tBLANK, a retry timer (tRETRY) starts immediately

after the blanking time has elapsed. During that time, the

switch stays off. At the end of tRETRY, the switch turns on

again. If the fault still exists, the cycle repeats. If the fault

has been removed, the switch stays on. During this cycle,

SC stays low. During retry when the switch is off, the

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

load current is greater than ISC, but does not reach the 2 x

ISC threshold, the tBLANK timer still begins counting (see

Figure 2). The resistor across IN and SENS sets ISC to

a typical value of 100mV/RSENSE (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).

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