LP87702 datasheet(15/98 Pages) TI

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7 Detailed Description

7.1 Overview

The LP87702 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 7-1 lists the output characteristics of the various converters.

Table 7-1. 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 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 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 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

www.ti.com

LP87702

SNVSBU3 – MARCH 2021

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