LT7184S datasheet(39/52 Pages) AD

39 / 52 page

Data Sheet

LT7184S

analog.com

Rev. 0

39 of 52

Software-Configurable Sequencing

Time-based sequencing offers a software-configurable means of defining a system's power-up and power-down

sequence. To employ time-based sequencing, program TON_DELAY to independently delay each channel so that its

soft-start ramp begins at the correct point in the sequence. The sequence starts when all channels are commanded

simultaneously using the OPERATION command or RUN pins. Similarly, turn-off sequencing is coordinated using the

TOFF_DELAY command.

When using time-based sequencing among multiple ADI devices, it is recommended that the SHARE_CLK pins of the

devices be connected to a pull-up resistor to 1.6V to 5.5V.

Figure 40. Event Based Sequencing

Event-Based Sequencing

Event-based sequencing offers a hardware-configurable means of defining a system's power-up and power-down

sequence.

The PGOODN pin from one regulator may be connected to the RUNN pin of the next regulator in the sequence, as

shown in Figure 40. The LT7184S holds the PGOODN pin low until the channel's soft-start ramp is complete and its

output voltage exceeds the value set in the VOUT_UV_FAULT_LIMIT.

LTPowerPlay GUI

LTPowerPlay is a powerful Windows-based development environment that supports Analog Devices’ digital power

systems management products, including the LT7184S. LTPowerPlay can be used to evaluate Analog Devices

products by connecting to a demo board or the user application board. LTPowerPlay can also be used in an offline

mode (with no hardware present) to build multiple configuration files that can be saved and reloaded at a later time.

LTPowerPlay provides valuable diagnostic information during system bring-up to program or adjust the power

supplies or diagnose power issues. LTPowerPlay utilizes Analog Devices' DC1613A USB-to-I2C/SMBus/PMBus adapter

to communicate with one of the many potential targets, including the LT7184S demo board. In application, the 3.3V

VCCIO supply from the DC1613A can be connected to the EXTVCC pin of the LT7184S for programming without applying

PVIN. The LTPowerPlay software also provides an automatic update feature to keep the revision current with the

latest device drivers and documentation. Many context-sensitive help is available within LTPowerPlay, along with

several tutorial demos. Refer to LTpowerPlay for more information.

LT7184S

RUN0

RUN1

PGOOD0

PGOOD1

LT7184S

RUN0

RUN1

PGOOD0

PGOOD1

START

TO NEXT CHANNEL

LT7184S Datasheet(PDF) 39 Page - Analog Devices

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