LD3986J285R datasheet(1/12 Pages) STMICROELECTRONICS

tên linh kiện	LD3986J285R

Giải thích chi tiết về linh kiện	DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS

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September 2005

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INPUT VOLTAGE FROM 2.5V TO 6V

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STABLE WITH LOW ESR CERAMIC

CAPACITORS

s

ULTRA LOW DROPOUT VOLTAGE (60mV

TYP. AT 150mA LOAD, 0.4mV TYP. AT 1mA

LOAD)

s

VERY LOW QUIESCENT CURRENT (155µA

TYP. AT NO LOAD, 290µA TYP. AT 150mA

LOAD; MAX 2µA IN OFF MODE)

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GUARANTEED OUTPUT CURRENT UP TO

150mA FOR BOTH OUTPUTS

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DUAL OUTPUT VOLTAGES

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FAST TURN-ON TIME: TYP. 120µs (CO=1µF,

CBYP=10nF AND IO=1mA)

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LOGIC-CONTROLLED ELECTRONIC

SHUTDOWN

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INTERNAL CURRENT AND THERMAL LIMIT

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OUTPUT LOW NOISE VOLTAGE 30µVRMS

OVER 10Hz to 100KHz

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S.V.R. OF 50dB AT 1KHz, 40dB AT 10KHz

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TEMPERATURE RANGE: -40°C TO 125°C

DESCRIPTION

The LD3986 provides up to 150mA at each output,

from 2.5V to 6V input voltage. The ultra low

drop-voltage, low quiescent current and low noise

make it suitable for low power applications and in

battery

powered

systems.

Regulator

ground

current increases only slightly in dropout, further

prolonging the battery life. Power supply rejection

is 50 dB at 1KHz and 40 dB at 10KHz. High power

supply rejection is maintained down to low input

voltage levels

common

to battery operated

circuits. Shutdown Logic Control function is

available for each output, this means that when

the device is used as local regulator, it is possible

to put a part of the board in standby, decreasing

the total power consumption. The LD3986 is

designed

to

work

with

low

ESR

ceramic

capacitors. Typical applications are in mobile

phone and similar battery powered wireless

systems.

LD3986

SERIES

DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE

REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS

Figure 1: Schematic Diagram

Flip-Chip

Rev. 3

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