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LDS3985M15R-LDS3985M25R-LDS3985M28R-LDS3985M30R
Very low drop and low noise BiCMOS 300 mA voltage regulator
February 2014 DocID11039 Rev 9 1/21
LDS3985Very low drop and low noise BiCMOS 300 mA
voltage regulator
Datasheet - production data
Features Input voltage from 2.5 V to 6 V Stable with low ESR ceramic capacitors Very low dropout voltage (150 mV typ. at 300
mA load, 0.4 mV typ. at 1 mA load) Very low quiescent current (85 µA typ. at no
load, 200 µA typ. at 300 mA load; max.1.5 µA
in OFF mode) Guaranteed output current up to 300 mA Wide range of output voltages available on
request: fixed from 1.25 V to 5 V with 100 mV
step Fast turn-on time: typ. 240 µs
–[CO = 2.2 µF, CBYP = 33 nF and IO = 1 mA] Logic-controlled electronic shutdown Internal current and thermal limit Low output voltage noise: 30 µ VRMS over 10
Hz to 100 kHz SVR of 55 dB at 1 kHz, 50 dB at 10 kHz Temperature range: - 40 °C to 125 °C Automotive grade product available in DFN6
package, temperature range: - 40 °C to 85 °C
DescriptionThe LDS3985 provides up to 300 mA, from 2.5 V
to 6 V input voltage. It is stable with ceramic and
high quality tantalum capacitor. The ultra low drop
voltage, low quiescent current and low noise
make it suitable for low power applications and
battery-powered systems. 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. Typical applications are
mobile phones and similar battery-powered
wireless systems, portable information
appliances.
Table 1. Device summary
Contents LDS39852/21 DocID11039 Rev 9
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
LDS3985 Diagram
1 Diagram
Figure 1. Schematic diagram
Pin configuration LDS39854/21 DocID11039 Rev 9
2 Pin configuration
Figure 2. Pin connections (top view for SOT23-5L, and for DFN6)
Table 2. Pin description
DocID11039 Rev 9 5/21
LDS3985 Maximum ratings
3 Maximum ratingsNote: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Absolute maximum ratings The input pin is able to withstand non repetitive spike of 6.5 V for 200 ms.
Table 4. Thermal data
Electrical characteristics LDS39856/21 DocID11039 Rev 9
4 Electrical characteristicsTJ = 25 °C, VI = VO(NOM) + 0.5 V, CI = 1 µF, CO = 2.2 µF, CBYP = 33 nF, IO = 1 mA,
VINH = 1.4 V, unless otherwise specified.
Table 5. LDS3985 electrical characteristics
DocID11039 Rev 9 7/21
LDS3985 Electrical characteristics For VO(NOM) < 2 V, VI = 2.5 V. For VO(NOM) = 1.25 V, VI = 2.5 V. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply to input voltages below 2.5 V. 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. Typical thermal protection hysteresis is 20 °C.
Table 5. LDS3985 electrical characteristics (continued)
Table 6. LDS3985 (automotive grade) electrical characteristics
Electrical characteristics LDS39858/21 DocID11039 Rev 9 For VO(NOM) < 2 V, VI = 2.5 V. For VO(NOM) = 1.25 V, VI = 2.5 V. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply to input voltages below 2.5 V. 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. Typical thermal protection hysteresis is 20 °C.
Table 6. LDS3985 (automotive grade) electrical characteristics (continued)
DocID11039 Rev 9 9/21
LDS3985 Typical performance characteristics Typical performance characteristicsTJ = 25 °C, VI = VO(NOM) + 0.5 V, CI = 1 µF, CO = 2.2 µF, CBYP = 33 nF, IO = 1 mA, VINH = 1.4
V, unless otherwise specified.
Figure 3. Output voltage vs. temperature
Figure 4. Output voltage vs. temperature
Figure 5. Output voltage vs. temperature
Figure 6. Inhibit voltage vs. temperature
Typical performance characteristics LDS3985 DocID11039 Rev 9
Figure 7. Inhibit voltage vs. temperature
Figure 8. Line regulation vs. temperature
Figure 9. Line regulation vs. temperature I= 3.2 V to 6 V)
Figure 10. Line regulation vs. temperature I= 3.8 V to 6 V)
Figure 11. Quiescent current vs. temperature
(VI = 2.5 V)
Figure 12. Quiescent current vs. temperature
(VI = 6 V)
LDS3985 Typical performance characteristics
Figure 13. Quiescent current vs. temperature
(VI = 3.4 V)
Figure 14. Supply voltage rejection vs.
frequency
Figure 15. Dropout voltage vs. temperature Figure 16. Dropout voltage vs. output current
Figure 17. Inhibit transient
