Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsLDS3985M33R

This is information on a product in full production.

October 2013 DocID11039 Rev 8 1/22

LDS3985xx

Very 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 voltage:

– from 1.25 V to 5.0 V

• Fast turn-on time: typ. 240 µs

–[C

= 2.2 µF, C

BYP

= 33 nF and I

= 1 mA]

• Logic-controlled electronic shutdown

• Internal current and thermal limit

• Output low noise voltage 30 µ V

RMS

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: 3.3 V in

DFN6 package, temperature range: - 40 °C to

85 °C

Description

The LDS3985xx 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. Regulator ground

current rises in dropout region slightly, prolonging

the battery life. 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 in

mobile phones and similar battery-powered

wireless systems, portable information

appliances.

SOT23-5L

www.st.com

Summary of content (22 pages)

PAGE 1
LDS3985xx Very low drop and low noise BiCMOS 300 mA voltage regulator Datasheet - production data 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. Regulator ground current rises in dropout region slightly, prolonging the battery life.
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Contents LDS3985xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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LDS3985xx 1 Diagram Diagram Figure 1.
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Pin configuration 2 LDS3985xx Pin configuration Figure 2. Pin connections (top view for SOT23-5L, and for DFN6) 627 / ')1 Table 1. Pin description Pin n° for SOT23-5L Pin n° for DFN6 Symbol 1 1 VI LDO input voltage. 2 5 GND Common ground. 3 6 VINH Inhibit input voltage: ON mode when VINH ≥ 1.2 V, OFF mode when VINH ≤ 0.4 V (do not leave it floating; it is not internally pulled down/up). 4 4 Bypass 5 3 VO - 2 N.C.
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LDS3985xx 3 Maximum ratings Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit (1) VI DC input voltage VO DC output voltage -0.3 to VI + 0.3 V Inhibit input voltage -0.3 to VI + 0.3 V VINH -0.
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Electrical characteristics 4 LDS3985xx Electrical characteristics TJ = 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 4. LDS3985xx electrical characteristics Symbol Parameter VI Operating input voltage VO Output voltage < 2.5 V VO Output voltage ≥ 2.5 V ΔVO Line regulation(1) Test conditions Min. Typ. Max. Unit 2.
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LDS3985xx Electrical characteristics Table 4. LDS3985xx electrical characteristics (continued) Symbol IO(PK) Parameter Peak output current Test conditions VO ≥ VO(NOM) - 5% Min. Typ. 300 550 Inhibit input logic low VINH Inhibit input logic high Max. Unit mA 0.4 VI = 2.5 V to 6 V, TJ= - 40 to 125 °C V 1.4 IINH Inhibit input current VINH = 0.4 V, VI = 6 V ±1 nA eN Output noise voltage BW = 10 Hz to 100 kHz, CO = 2.
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Electrical characteristics LDS3985xx Table 5. LDS3985xx (automotive grade) electrical characteristics (continued) Symbol Parameter Test conditions Min. IO = 0 Quiescent current ON mode: VINH = 1.24 V IQ Typ. Max. Unit 85 IO = 0, TJ = - 40 to 85 °C 150 IO = 0 to 300 mA 200 µA IO = 0 to 300 mA, TJ = - 40 to 85 °C 300 0.003 OFF mode: VINH = 0.4 V TJ = - 40 to 85 °C 1.5 IO = 1 mA 0.
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LDS3985xx 5 Typical performance characteristics Typical performance characteristics TJ = 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 4. Output voltage vs. temperature Figure 3. Output voltage vs. temperature (VI = 3.2 V) (VI = 2.5 V) Figure 5. Output voltage vs. temperature (VI = 3.8 V) Figure 6. Shutdown voltage vs. temperature (VO = 1.
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Typical performance characteristics LDS3985xx Figure 7. Shutdown voltage vs. temperature (VO = 3.3 V) Figure 8. Line regulation vs. temperature (VI = 2.5 V to 6 V) Figure 9. Line regulation vs. temperature (VI = 3.2 V to 6 V) Figure 10. Line regulation vs. temperature (VI = 3.8 V to 6 V) Figure 11. Quiescent current vs. temperature (VI = 2.5 V) Figure 12. Quiescent current vs.
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LDS3985xx 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 VI = 5 V, IO = 1 mA, VINH = 0 to 1.
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Package mechanical data 6 LDS3985xx Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 6. SOT23-5L mechanical data mm Dim. Min. 12/22 Typ. Max. A 0.90 1.45 A1 0 0.15 A2 0.90 1.30 b 0.30 0.50 c 2.09 0.20 D 2.95 E 1.
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LDS3985xx Package mechanical data Figure 18. SOT23-5L mechanical drawings BN Figure 19. SOT23-5L recommended footprint (dimensions in mm).
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Package mechanical data LDS3985xx Table 7. DFN6 (3 x 3 mm) mechanical data mm Dim. Min. A 0.80 A1 0 Typ. Max. 1 0.02 A3 0.05 0.20 b 0.23 D 2.90 D2 2.23 E 2.90 E2 1.50 0.45 3 3.10 2.50 3 3.10 1.75 0.95 L 14/22 0.30 0.40 DocID11039 Rev 8 0.
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LDS3985xx Package mechanical data Figure 20.
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Package mechanical data LDS3985xx Figure 21.
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LDS3985xx 7 Packaging mechanical data Packaging mechanical data Table 8. Tape and reel SOT23-5L mechanical data mm Dim. Min. Typ. A Max. 180 C 12.8 D 20.2 N 60 13.0 T 13.2 14.4 Ao 3.13 3.23 3.33 Bo 3.07 3.17 3.27 Ko 1.27 1.37 1.47 Po 3.9 4.0 4.1 P 3.9 4.0 4.1 Figure 22.
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Packaging mechanical data LDS3985xx Table 9. DFN6 tape and reel mechanical data mm Dim. Min. Typ. Max. A0 3.20 3.30 3.40 B0 3.20 3.30 3.40 K0 1 1.10 1.20 Figure 23.
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LDS3985xx Packaging mechanical data Figure 24.
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Ordering information 8 LDS3985xx Ordering information Table 10. Order codes Packages SOT23-5L DFN6 DFN6 Output voltage (automotive grade) LDS3985M125R (1) 1.25 V (1) 1.35 V LDS3985M135R LDS3985M15R LDS3985PU15R 1.5 V LDS3985M18R 1.8 V LDS3985M20R (1) 2.0 V LDS3985M21R (1) 2.1 V LDS3985M22R (1) 2.2 V LDS3985M25R 2.5 V LDS3985M26R (1) 2.6 V LDS3985M27R (1) 2.7 V LDS3985M28R LDS3985M285R LDS3985M29R LDS3985PU28R 2.8 V (1) 2.85 V (1) 2.9 V LDS3985M30R LDS3985M33R 3.
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LDS3985xx 9 Revision history Revision history Table 11. Document revision history Date Revision 02-Dec-2004 1 First release. 10-Apr-2007 2 Added: new package TSOT23-5L. 16-May-2007 3 Added: new mechanical data DFN6D and order codes updated. 06-Sep-2007 4 Added: Table 1 in cover page. 11-Jun-2008 5 Modified: Table 10 on page 20. 11-Jul-2009 6 Modified: Table 10 on page 20. 29-Jul-2010 7 Modified: Table 1 on page 1 and Table 10 on page 20.
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LDS3985xx Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.