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LD3985

Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

STMicroelectronics 

LD3985xx

Ultra low drop-low noise BiCMOS voltage

regulators low ESR capacitors compatible

Features

■ Input voltage from 2.5 V to 6 V

■ Stable with low ESR ceramic capacitors

■ Ultra low dropout voltage (60 mV typ. at 150

mA load, 0.4 mV typ. at 1 mA load)

■ Very low quiescent current (85 µA typ. at no

load, 170 µA typ. at 150 mA load; max 1.5 µA

in OFF mode)

■ Guaranteed output current up to 150 mA

■ Wide range of output voltage: 1.22 V; 1.8 V; 2.5

V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V

■ Fast turn-on time: typ. 200 µs [CO = 1 µF, CBYP

= 10 nF and IO = 1 mA]

■ Logic-controlled electronic shutdown

■ Internal current and thermal limit

■ Output low noise voltage 30 µVRMS over 10 Hz

to 100 kHz

■ SVR of 60 dB at 1 kHz, 50 dB at 10 kHz

■ Temperature range: - 40 °C to 125 °C

Description

Flip-chip

(1.57 x 1.22)

SOT23-5L

TSOT23-5L

to roll off at 10 kHz. High power supply rejection is

maintained down to low input voltage levels

common to battery operated circuits. Shutdown

logic control function is available, 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

LD3985xx is designed to work with low ESR

ceramic capacitors. Typical applications are in

mobile phone and similar battery powered

wireless systems.

The LD3985xx provides up to 150 mA, from 2.5 V

to 6 V 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 better than 60 dB at low frequencies and starts

Table 1. Device summary

Part numbers

LD3985XX122

LD3985XX18

LD3985XX25

LD3985XX26

LD3985XX27

LD3985XX28

LD3985XX29

LD3985XX30

LD3985XX33

LD3985XX47

January 2011

Doc ID 9587 Rev 14

1/23

www.st.com

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