LP5990屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由美國德州儀器公司制造生產(chǎn)的LP5990穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無論負(fù)載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個最小量，并且在工作時會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開關(guān)模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應(yīng)用。

1FEATURES

2? Operation from 2.2V to 5.5V Input

? ±1% Accuracy Over Temp Range

? Output Voltage from 0.8V to 3.6V in 50mV

Increments

? 30 μA Quiescent Current (Enabled)

? 10nA Quiescent Current (Disabled)

? 160mV Dropout at 200mA Load

? 60 μVRMSOutput Voltage Noise

? 60 μs Start-Up Time

? 500μs Shut-Down Time

? PSRR 55 dB at 10 kHz

? Stable with 0402 1.0μF Ceramic Capacitors

? Logic Controlled Enable

? Thermal–Overload and Short–Circuit

Protection

APPLICATIONS

? Cellular Phones

? Hand–Held Information Appliances

PACKAGE

? 4-Bump DSBGA, 0.4 mm Pitch 866 μm x 917

μm (Lead Free)

DESCRIPTION

The LP5990 regulator is designed to meet the

requirements of portable, battery-powered systems

providing an accurate output voltage, low noise and

low quiescent current.

The LP5990 will provide a 1.8V output from a low

input voltage of 2.2V and can provide 200mA to an

external load.

When switched into shutdown mode via a logic signal

at the enable pin, the power consumption is reduced

to virtually

zero.

Fast shut-down is achieved by the push pull

architecture.

The LP5990 is designed to be stable with space

saving 0402 ceramic capacitors as small as 1μF, this

gives an overall solution size of < 2.5mm 2.

Performance is specified for a -40°C to 125°C

junction temperature range.

The device is available in DSBGA Package (0.4mm

pitch) and is available with

1.2V,1.3V,1.8V,2.8V,3.0V,3.3V and 3.6V outputs.

Lower voltage options down to 0.8V are available on request. For all other output voltage options please

contact your local TI sales office.