LTC7151S datasheet(28/38 Pages) AD

28 / 38 page

LT7182S

Rev. 0

For more information www.analog.com

APPLICATIONS INFORMATION

Table 7. Programmable Internal Compensation Lead Resistor RITH

MFR_PWM_MODE_LT7182S

BITS [5:3]

INTERNAL RITH VALUE

120kΩ

100kΩ

80kΩ

60kΩ

40kΩ

20kΩ

10kΩ

5kΩ

Table 8. Programmable Internal Compensation Capacitor CITH

MFR_PWM_MODE_LT7182S

BITS [8:6]

INTERNAL CITH VALUE

80pF

70pF

60pF

50pF

40pF

30pF

20pF

10pF

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 begins when all channels are commanded

on simultaneously using either 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 together to a pull-up resistor

to 1.6V to 5.5V.

EVENT-BASED SEQUENCING

Event-based sequencing offers a hardware-configurable

means of defining a system’s power-up and power-down

sequence.

The PGOOD pin from one regulator may be connected

to the RUN pin of the next regulator in the sequence as

shown in Figure 8.

The LT7182S holds the PGOOD pin low until the channel’s

soft-start ramp is complete and its output voltage exceeds

the value set in VOUT_UV_FAULT_LIMT.

Figure 8. Event-Based Sequencing

LTpowerPlay GUI

LTpowerPlay is a powerful Windows-based development

environment that supports Analog Devices digital power

system management products including the LT7182S.

LTpowerPlay can be used to evaluate Analog Devices

products by connecting to a demo board or to the user

application board. LTpowerPlay can also be used in an

offline mode (with no hardware present) in order 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 pro-

gram or adjust the power supplies or to diagnose power

issues. LTpowerPlay utilizes Analog Devices’s DC1613A

USB-to-I2C/SMBus/PMBus adapter to communicate with

one of the many potential targets including the DC2836A

demo board. In application, the 3.3V VCCIO supply from

the DC1613A can be connected to the EXTVCC pin of the

LT7182S for programming without applying PVIN. The

LTpowerPlay software also provides an automatic update

feature to keep the revision current with the latest set of

device drivers and documentation. A great deal of context

sensitive help is available within LTpowerPlay along with

several tutorial demos. More information is available at:

https://www.analog.com/ltpowerplay

PGOOD0

PGOOD1

RUN0

START

RUN1

7182s F08

PGOOD0

LT7182S

PGOOD1

TO NEXT CHANNEL

IN THE SEQUENCE

RUN0

RUN1

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