LTC4367 datasheet(9/22 Pages) AD

9 / 22 page

LTC4249

Rev. 0

For more information www.analog.com

The LTC4249 finds great utility in RF Power Amplifier (PA)

and industrial safety applications. Massive MIMO arrays

with defective elements can be automatically isolated from

a common power bus, preventing unwanted bus loading.

The LTC4249 provides two 65V electronic circuit breakers

with built-in protection and current monitoring circuitry.

Enable (EN) inputs and ready (RDY) outputs make bias

sequencing applications painless.

Short-circuit protection and automatic inrush control

requires no external components. Overcurrent (OC)

threshold accuracy (±5%) minimizes over-design of input

power supplies.

Precise enable input and current monitor thresholds allow

undervoltage (UV), overvoltage (OV), overcurrent (OC)

and short-circuit (SC) detection and protection. Back-to-

back connections of the ECBs permit reverse OC pro-

tection and isolation applications. Each OC threshold is

configured with a single resistor.

ECB channels may be paralleled for load current sharing.

A skipped lead package option is available for high volt-

age spacing requirements. An integrated backside thermal

pad for printed circuit board design allows high ambient

temperature and high current applications.

Enabling an ECB Channel

An input logic signal from a controller may be used to

enable a circuit breaker channel. The EN input threshold

is 0.8V, which accommodates low-voltage logic opera-

tion and/or resistively configured undervoltage lockout.

Figure 1 shows a simplified enable application using a

microcontroller open-drain output and an opto-isolator.

The ECBs turn on when the switches release pull down

on the EN inputs. The resistors at the EN inputs provide

pull-up capability and keep the maximum voltage at EN

below the absolute maximum of 5.5V.

APPLICATIONS INFORMATION

10k

121k

10k

TO LOAD

65V

RIMON1

10k

22µF

GND

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

IMON2

RDY2

IN2

EN2

OUT2

INTVCC

0.1µF

SOME CONNECTIONS

OMITTED FOR CLARITY

µC

EN1

EN2

RIMON2

1.5V

10k

Figure 1. Switch Based Enable

Because the EN input threshold is ±2.5% accurate over

temperature, a resistive divider can be connected to EN

and a power supply, to form a voltage based enable with

undervoltage (UV) lockout. If the monitored voltage is too

low, the ECB channel is disabled.

Figure 2 demonstrates a voltage based enable using exter-

nal 1% tolerance resistors. The desired UV threshold is

10.8V. The application assumes that the monitored supply

is nominally 12V.

TO LOAD

12V

RIMON

10k

22µF

GND

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

IMON2

RDY2

IN2

EN2

OUT2

INTVCC

0.1µF

SOME CONNECTIONS

OMITTED FOR CLARITY

8.06k

100k

UV THRESHOLD

RISING = 10.73V

UV THRESHOLD

FALLING = 10.26V

Figure 2. Voltage Based Enable with

Undervoltage Lockout and Hysteresis

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