LP873345RHDT集成電路（IC）的線性穩(wěn)壓器控制器規(guī)格書PDF中文資料

LP873345RHDT屬于集成電路（IC）的線性穩(wěn)壓器控制器。由德州儀器制造生產(chǎn)的LP873345RHDT穩(wěn)壓器 - 線性 + 開關(guān)此產(chǎn)品族中的產(chǎn)品用于構(gòu)建執(zhí)行 DC-DC 轉(zhuǎn)換或電壓調(diào)節(jié)功能的電路，采用的是開關(guān)模式和線性穩(wěn)壓器功能的組合。雖然具體的拓撲各不相同，但此類產(chǎn)品的主要目的是將開關(guān)模式技術(shù)的效率優(yōu)勢與線性穩(wěn)壓技術(shù)的低噪聲特性結(jié)合在一起。

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

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 I2C-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 startup

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.