MAX16946EVKIT+【PDF 12/21 页】KIT EVALUATION FOR MAX16946

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MAX16946/MAX16947

Remote Antenna, Current-Sense and

LDO/Switches

Load Protection

The devices monitor the load current through an external

sense resistor and perform the following actions:

U If the monitored current is lower than the set open-

load current, the devices signal that there is an open-

load (see the Open Load section).

U If the monitored current is greater than the set short-

circuit current (I SC ), the devices enter the short-

circuit mode (see the Short Circuit and Current Limit

section).

The devices also perform a short-to-battery detection

before the internal switch turns on. During normal opera-

tion, reverse-current detection protects the devices from

short-to-battery events (see the Short-to-Battery and

Reverse-Current Detection section).

In addition, thermal shutdown protects the devices from

overheating (see the Thermal Shutdown section).

Two open-drain fault indicator outputs ( OL and SC ) and the

AOUT voltage indicate the devices’ status (Table 1).

Open Load

If the load current drops below the open-load cur-

rent threshold, the OL output latches low. An open-

load condition does not turn off the internal switch. To

unlatch the OL output, pulse SHDN low for less than

t SHDN_OFF (150 F s min). Keeping SHDN low for longer than

t SHDN_OFF shuts down the device.

The open-load current threshold is adjustable. Connect

a resistive divider between REF, the open-load current

threshold adjustment input (OLT), and GND to set the

Short Circuit and Current Limit

If the load current exceeds the set short-circuit cur-

rent threshold (I SC ), the t BLANK timer begins counting.

During this period, the load current is limited to the

current limit set by the voltage at LIM. If the overcurrent

condition persists beyond t BLANK , SC asserts low and

the internal switch turns off. The timer resets if the over-

current condition disappears before the blanking time

(t BLANK ) has elapsed.

If the switch is turned off at the end of t BLANK , a retry

timer (t RETRY ) starts immediately after the blanking time

has elapsed, and during that time the switch stays off.

At the end of t RETRY , the switch turns on again while

SC stays low. If the fault still exists, the cycle repeats. If

the fault has been removed, the switch stays on and SC

goes high after the blanking time t BLANK . During retry

when the switch is off, the current through the switch is

zero. Blanking time and retry time have fixed values of

100ms (min) and 1100ms (min), respectively.

Figures 1–4 show the response of the devices to the

presence and removal of overcurrent conditions.

The current-limit threshold is adjustable. Connect a

resistive divider between REF, the current-limit setting

input (LIM), and GND to set the current-limit threshold.

Alternatively, externally drive LIM (not to exceed 3.65V)

to set the current-limit threshold (see the Current-Limit

Threshold Selection section).

The short-circuit current threshold depends on the value

of the sense resistor and is calculated as follows:

open-load current threshold (see the Open-Load Current

Threshold Selection section).

I SC =

1.3V

R SENSE × A V

where A V is the gain of the internal current-sense ampli-

fier and is equal to 26V/V and R SENSE is the sense resis-

tor value.

12

Maxim Integrated

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