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LD3985G285RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985G28RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985G30RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985G33RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985G50RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985M12RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985M26RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985M28RSTN/a5249avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985M30RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985M50RSTN/a6000avaiULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE


LD3985M30R ,ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLEAbsolute Maximum Ratings are those values beyond which damage to the device may occur. Functional o ..
LD3985M32R ,ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLEAbsolute Maximum Ratings Symbol Parameter Value UnitV DC Input Voltage-0.3 to 6 (*) VIV DC Outp ..
LD3985M33R ,ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLELD3985SERIESULTRA LOW DROP-LOW NOISE BICMOS VOLTAGEREGULATORS LOW ESR CAPACITORS COMPATIBLE

LD3985G285R-LD3985G28R-LD3985G30R-LD3985G33R-LD3985G50R-LD3985M12R-LD3985M26R-LD3985M28R-LD3985M30R-LD3985M50R
ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE
1/14October 2004 INPUT VOLTAGE FROM 2.5V TO 6V STABLE WITH LOW ESR CERAMIC
CAPACITORS ULTRA LOW DROPOUT VOLTAGE (100mV
TYP. AT 150mA LOAD, 0.4mV TYP. AT 1mA
LOAD) VERY LOW QUIESCENT CURRENT (85µA
TYP. AT NO LOAD, 170µA TYP. AT 150mA
LOAD; MAX 1.5µA IN OFF MODE) GUARANTEED OUTPUT CURRENT UP TO
150mA WIDE RANGE OF OUTPUT VOLTAGE: 1.2V;
1.22V; 1.25V; 1.35V; 1.5V; 1.8V; 2V; 2.1V;
2.2V; 2.4V; 2.5V; 2.6V; 2.7V; 2.8V; 2.85V;
2.9V; 3V; 3.1V; 3.2V; 3.3V; 4.7V; 5V FAST TURN-ON TIME: TYP. 200µs [C O=1µF, C BYP = 10nF AND IO =1mA] LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN INTERNAL CURRENT AND THERMAL LIMIT OUTPUT LOW NOISE VOLTAGE 30µVRMS
OVER 10Hz to 100KHz S.V.R. OF 60dB AT 1KHz, 50dB AT 10KHz TEMPERATURE RANGE: -40°C TO 125°C
DESCRIPTION

The LD3985 provides up to 150mA, 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 better than 60 dB at low
frequencies and starts to roll off 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, 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 LD3985 is designed to work
with low ESR ceramic capacitors. Typical
applications are in mobile phone and similar
battery powered wireless systems.
LD3985
SERIES

ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE
REGULATORS LOW ESR CAPACITORS COMPATIBLE
Figure 1: Schematic Diagram

Rev. 8
LD3985 SERIES
2/14
Table 1: Absolute Maximum Ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
(*) The input pin is able to withstand non repetitive spike of 6.5V for 200ms.
Table 2: Thermal Data
Table 3: Order Codes

(*) Available on request.
LD3985 SERIES
3/14
Figure 2: Connection Diagram (top view for SOT and TSOT, top through view for Flip-Chip)
Table 4: Pin Description
Figure 3: Typical Application Circuit
LD3985 SERIES
4/14
Table 5: Electrical Characteristics For LD3985 (T
j = 25°C, VI = V O(NOM) +0.5V, CI = 1μF, BYP = 10nF, IO = 1mA, V INH = 1.4V, unless otherwise specified)
LD3985 SERIES
5/14
Note 1 – For VO(NOM) < 2V, VI = 2.5V
Note 2 – For VO(NOM) = 1.25V, VI = 2.5V
Note 3 – Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This speci-
fication does not apply for input voltages below 2.5V.
Note 4 – Turn-on time is time measured between the enable input just exceeding VINH High Value and the output voltage just reaching 95%
of its nominal value
Note 5 – Typical thermal protection hysteresis is 20°C
Note 6 - The minimum capacitor value is 1µF, anyway the LD3985 is still stable if the compensation capacitor has a 30% toleranc e in all
temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS (Tj = 25°C, VI = VO(NOM) +0.5V, CI = CO = 1μF,

CBYP = 10nF, IO = 1mA, V INH = 1.4V, unless otherwise specified)
Figure 4: Output Voltage vs Temperature

Figure 5: Output Voltage vs Temperature

Figure 6: Output Voltage vs Temperature

Figure 7: Shutdown Voltage vs Temperature

LD3985 SERIES
6/14
Figure 8: Shutdown Voltage vs Temperature

Figure 9: Line Regulation vs Temperature

Figure 10: Line Regulation vs Temperature

Figure 11: Line Regulation vs Temperature

Figure 12: Load Regulation vs Temperature

Figure 13: Load Regulation vs Temperature

LD3985 SERIES
7/14
Figure 14: Load Regulation vs Temperature

Figure 15: Quiescent Current vs Temperature

Figure 16: Quiescent Current vs Temperature

Figure 17: Quiescent Current vs Temperature

Figure 18: Supply Voltage Rejection vs

Frequency
Figure 19: Load Transient Response

VI = 3.2V, IO = 1 to 150mA, Rise-Fall time = 1μsec
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