LP87702 datasheet(16/99 Pages) TI

16 / 99 page

8 Detailed Description

8.1 Overview

The LP87702-Q1 is a high-efficiency, high-performance power supply IC with two step-down DC/DC converters

(Buck0 and Buck1) and boost converter for automotive and industrial applications. The input voltage range is

from 2.8 V to 5.5 V. The typical application input voltage levels are 3.3 V and 5 V. VANAOVP is set to 4.3 V

(typical) with 3.3 V input and boost enabled. The boost can be used as a load switch and VANAOVP is set to 5.8

V (typical) when input voltage is 5 V. VANAOVP is selected in OTP by VANA_OVP_SEL and is a fixed factory

setting. Table 8-1 lists the output characteristics of the various converters.

Table 8-1. Supply Specification

SUPPLY

OUTPUT

VOUT RANGE (V)

RESOLUTION (mV)

IMAX MAXIMUM OUTPUT CURRENT (mA)

Boost

4.9 to 5.2

100

600

Buck0

0.7 to 3.36

10 (0.7 V to 0.73 V)

5 (0.73 V to 1.4 V)

20 (1.4 V to 3.36 V)

3500

Buck1

0.7 to 3.36

10 (0.7 V to 0.73 V)

5 (0.73 V to 1.4 V)

20 (1.4 V to 3.36 V)

3500

The LP87702-Q1 converters support switching clock synchronization to an external clock connected to CLKIN

input. The external clock can be from 1 MHz to 24 MHz with 1-MHz steps. Alternatively, optional spread

spectrum mode can be enabled to reduce EMI.

LP87702-Q1 features include diagnostics, monitoring, and protections for the devices internal and system level

operation, which are the following:

• Soft start

• Input undervoltage lockout

• Programmable undervoltage or window (overvoltage and undervoltage) monitoring for the input (from VANA

pin)

• Programmable undervoltage or window (overvoltage and undervoltage) monitoring for the buck and boost

converter outputs

• Two inputs (VMONx) with programmable undervoltage or window (overvoltage and undervoltage) thresholds,

for monitoring external rails in the system

• One dedicated power-good output (PG0) to which selected monitoring signals can be combined

• Second programmable power-good output (PG1), multiplexed with general purpose output (GPO1)

• Power good flags with maskable interrupt

• Programmable window watchdog

• Buck and boost converter overload detection

• Thermal warning with two selectable thresholds

• Thermal shutdown

LP87702-Q1 control interface:

• Up to three enable inputs ( EN1, EN2, and EN3) with programmable power-up or power-down sequence

control

• Optional I2C (multiplexed with EN2 and EN3 inputs)

• Interrupt signal (nINT) to host

• Reset input (NRST)

• One dedicated general purpose output (GPO0)

• Watchdog disable WD_DIS, multiplexed with CLKIN/GPO2

LP87702-Q1

SNVSAL1C – DECEMBER 2017 – REVISED JUNE 2021

www.ti.com

Submit Document Feedback

Product Folder Links: LP87702-Q1

LP87702 датащи(PDF) 16 Page - Texas Instruments

LP87702 датащи(HTML) 16 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

датащи скачать

ссылки URL