LD3985M25R ,ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLEapplications are in mobile phone and similarThe LD3985 provides up to 150mA, from 2.5V tobattery po ..
LD3985M25R ,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 ..
LD3985M25R ,ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLEapplications and in battery powered systems.2.9V; 3V; 3.1V; 3.2V; 3.3V; 4.7V; 5VRegulator ground cu ..
LD3985M26R ,ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLELD3985SERIESULTRA LOW DROP-LOW NOISE BICMOS VOLTAGEREGULATORS LOW ESR CAPACITORS COMPATIBLE
LD3985G18R-LD3985G25R-LD3985G47R-LD3985J18R-LD3985J26R-LD3985J31R-LD3985M122R-LD3985M18R-LD3985M25R-LD3985M27R-LD3985M32R-LD3985M33R-LD3985M47R
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
DESCRIPTIONThe 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
SERIESULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE
REGULATORS LOW ESR CAPACITORS COMPATIBLE
Figure 1: Schematic DiagramRev. 8
LD3985 SERIES2/14
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 SERIES3/14
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 SERIES4/14
Table 5: Electrical Characteristics For LD3985 (Tj = 25°C, VI = V O(NOM) +0.5V, CI = 1μF, BYP = 10nF, IO = 1mA, V INH = 1.4V, unless otherwise specified)
LD3985 SERIES5/14
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 SERIES6/14
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 SERIES7/14
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 vsFrequency
Figure 19: Load Transient Response
VI = 3.2V, IO = 1 to 150mA, Rise-Fall time = 1μsec
