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LD3986J285R| Datasheet

By datasheet - April 3rd, 2008

LD3986J285R, LD3986XX285

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LD3986 SERIES
DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS
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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 (155uA TYP. AT NO LOAD, 290uA TYP. AT 150mA LOAD; MAX 2uA IN OFF MODE) GUARANTEED OUTPUT CURRENT UP TO 150mA FOR BOTH OUTPUTS DUAL OUTPUT VOLTAGES FAST TURN-ON TIME: TYP. 120us (CO=1uF, CBYP=10nF AND IO=1mA) LOGIC-CONTROLLED ELECTRONIC SHUTDOWN INTERNAL CURRENT AND THERMAL LIMIT OUTPUT LOW NOISE VOLTAGE 30uVRMS OVER 10Hz to 100KHz S.V.R. OF 50dB AT 1KHz, 40dB AT 10KHz TEMPERATURE RANGE: -40 C TO 125 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

Figure 1: Schematic Diagram

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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.

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September 2005

Rev. 3

1/12


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