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LD3986

SERIES

DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE

REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS

s

s

s

s

s

s

s

s

s

s

s

s

INPUT VOLTAGE FROM 2.5V TO 6V

STABLE WITH LOW ESR CERAMIC

CAPACITORS

ULTRA LOW DROPOUT VOLTAGE (60mV

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

LOAD)

VERY LOW QUIESCENT CURRENT (155碌A(chǔ)

TYP. AT NO LOAD, 290碌A(chǔ) TYP. AT 150mA

LOAD; MAX 2碌A(chǔ) IN OFF MODE)

GUARANTEED OUTPUT CURRENT UP TO

150mA FOR BOTH OUTPUTS

DUAL OUTPUT VOLTAGES

FAST TURN-ON TIME: TYP. 120碌s (C

O

=1碌F,

C

BYP

=10nF AND I

O

=1mA)

LOGIC-CONTROLLED ELECTRONIC

SHUTDOWN

INTERNAL CURRENT AND THERMAL LIMIT

OUTPUT LOW NOISE VOLTAGE 30碌V

RMS

OVER 10Hz to 100KHz

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

TEMPERATURE RANGE: -40擄C TO 125擄C

Flip-Chip

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.

Figure 1: Schematic Diagram

September 2005

Rev. 3

1/12

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