Texas Instruments LP8733 Handleiding

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LP8733xx Dual High-Current Buck Converter and Dual Linear Regulator

1 Features

•Device operating temperature range: –40°C to

+125°C ambient temperature

•Input voltage: 2.8 V to 5.5 V

•Two high-efficiency step-down DC/DC converters:

–Output voltage: 0.7 V to 3.36 V

–Maximum output current 3 A per phase

–Adding and shedding auto phase and

force multi-phase operations in dual-phase

configuration

–Remote differential feedback voltage sensing in

dual-phase configuration

–Programmable output-voltage slew rate from

0.5 mV/µs to 10 mV/µs

–2-MHz switching frequency

–Spread-spectrum mode and phase interleaving

for EMI reduction

•Two linear regulators:

–Input voltage: 2.5 V to 5.5 V

–Output voltage: 0.8 V to 3.3 V

–Maximum output current 300 mA

•Configurable general-purpose output signals

(GPO, GPO2)

•Interrupt function with programmable masking

•Programmable power-good signal (PGOOD)

•Output short-circuit and overload protection

•Overtemperature warning and protection

•Overvoltage protection (OVP) and undervoltage

lockout (UVLO)

•28-pin, 5-mm × 5-mm VQFN package with

wettable flanks

SW_B0VIN_B0

VIN_B1

VANA

VIN

FB_B0

1 ± 2

Outputs

SDA

SCL

nINT

CLKIN (GPO2)

GNDs

EN

GPO

SW_B1

FB_B1

PGOOD

VOUT_LDO1

VOUT_LDO0

VIN_LDO0

VIN_LDO1

VOUT_LDO0

VOUT_LDO1

Copyright © 2018, Texas Instruments Incorporated

Configurable

multi-phase

Simplified Schematic

2 Applications

•Industrial applications

•Industrial appliances

•Test and measurement

3 Description

The LP8733xx is designed to meet the power

management requirements in industrial applications.

The device has two step-down DC/DC converters

(which can be configured as a single dual-phase

regulator or two single-phase regulators), two linear

regulators, and two general-purpose digital-output

signals. The device is controlled by an I

2

C-compatible

serial interface and by an enable signal.

The automatic PWM/PFM (AUTO mode) operation

together with the automatic phase adding/shedding

gives high efficiency over a wide output-current

range. The LP8733xx supports remote voltage

sensing (differential in dual-phase configuration) to

compensate IR drop between the regulator output and

the point-of-load (POL), thus improving the accuracy

of the output voltage. In addition, the switching clock

can be forced to PWM mode and also synchronized to

an external clock to minimize the disturbances.

The LP8733xx device supports programmable start-

up and shutdown delays and sequences including

GPO signals synchronized to the enable signal.

During start-up and voltage change, the device

controls the output slew rate to minimize output

voltage overshoot and the in-rush current.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LP8733xxVQFN (28)5.00 mm × 5.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

Output Current (A)

Efficiency (%)

0.0250.116

50

60

70

80

90

100

D420

1PH, Vin=3.7V, Vout=1.0V

1PH, Vin=3.7V, Vout=2.5V

2PH, Vin=3.7V, Vout=1.0V

2PH, Vin=3.7V, Vout=2.5V

DC/DC Efficiency vs Output Current

LP8733

SNVSBK2A – SEPTEMBER 2019 – REVISED JUNE 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties