LD3985G18R| Datasheet

LD3985G18R, LD3985G25R, LD3985G27R, LD3985G33R, LD3985G47R, LD3985J18R, LD3985J25R, LD3985J26R, LD3985J29R, LD3985J33R, LD3985M122R, LD3985M18R, LD3985M25R, LD3985M27R, LD3985M29R, LD3985M30R, LD3985M33R, LD3985M47R, LD3985XX12, LD3985XX122, LD3985XX15, LD3985XX18, LD3985XX24, LD3985XX25, LD3985XX26, LD3985XX27, LD3985XX29, LD3985XX30, LD3985XX31, LD3985XX32, LD3985XX33, LD3985XX47

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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 (100 mV typ. at 150 mA load, 0.4 mV typ. at 1 mA load) Very low quiescent current (85 uA typ. at no load, 170 uA typ. at 150 mA load; max 1.5 uA 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 us [CO = 1 uF, CBYP = 10 nF and IO = 1 mA] Logic-controlled electronic shutdown Internal current and thermal limit Output low noise voltage 30 uVRMS over 10 Hz to 100 kHz S.V.R. of 60 dB at 1 kHz, 50 dB at 10 kHz Temperature range: -40 C to 125 C 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 to roll off at 10 kHz. High power supply r
ejection 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.
Flip-chip

(1.57x1.22)

SOT23-5L

TSOT23-5L

Description
The LD3985xx provides up to 150 mA, from 2.5 V to 6 V input voltage.

Table 1.

Device summary
Part number LD3985XX122 LD3985XX18 LD3985XX25 LD3985XX26 LD3985XX27 LD3985XX28 LD3985XX29 LD3985XX30 LD3985XX33 LD3985XX47 Rev 12 1/22
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December 2007