LDS3985PU33R

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May 2017 DocID11039 Rev 10 1/21 This is information on a product in full production. www.st.com LDS3985 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 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 Description The 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 Packages Output voltage (V) SOT23-5L DFN6 (3 x 3 mm) DFN6 (3 x 3 mm) automotive-grade LDS3985M15R LDS3985PU15R 1.5 LDS3985M18R LDS3985PU18RY (1) 1.8 LDS3985M25R 2.5 LDS3985M28R LDS3985PU28R 2.8 LDS3985M30R 3.0 LDS3985M33R LDS3985PU33R LDS3985PU33RY(1) 3.3 LDS3985M50R 5.0 Notes: (1)Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 and Q002 or equivalent.

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Contents LDS3985 2/21 DocID11039 Rev 10 Contents 1 Diagram ............................................................................................ 3 2 Pin configuration ............................................................................. 4 3 Maximum ratings ............................................................................. 5 4 Electrical characteristics ................................................................ 6 5 Typical performance characteristics ........................................... 10 6 Package information ..................................................................... 13 6.1 SOT23-5L package information ...................................................... 13 6.2 SOT23-5L packing information ........................................................ 15 6.3 DFN6 (3 x 3 mm) package information ........................................... 16 6.4 DFN6 (3 x 3 mm) packing information ............................................. 18 7 Revision history ............................................................................ 20

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LDS3985 Diagram DocID11039 Rev 10 3/21 1 Diagram Figure 1: Schematic diagram

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Pin configuration LDS3985 4/21 DocID11039 Rev 10 2 Pin configuration Figure 2: Pin connections (top view for SOT23-5L, and for DFN6 (3 x 3 mm)) Table 2: Pin description Pin for SOT23-5L Pin for DFN6 (3 x 3 mm) Symbol Name and function 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 Bypass pin: an external capacitor to be connected (usually 10 nF) to minimize noise voltage 5 3 VO LDO output voltage - 2 N.C. Not connected

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LDS3985 Maximum ratings DocID11039 Rev 10 5/21 3 Maximum ratings Table 3: Absolute maximum ratings Symbol Parameter Value Unit VI DC input voltage -0.3 to 6 (1) V VO DC output voltage -0.3 to VI + 0.3 V VINH Inhibit input voltage -0.3 to VI + 0.3 V IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range -65 to 150 °C TOP Operating junction temperature range -40 to 125 °C Operating junction temperature range, automotive grade version - 40 to 85 °C Notes: (1)The input pin is able to withstand non repetitive spike of 6.5 V for 200 ms. Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4: Thermal data Symbol Parameter SOT23-5L DFN6 (3 x 3 mm) Unit RthJC Thermal resistance junction-case 81 10 °C/W RthJA Thermal resistance junction-ambient 255 55 °C/W

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Electrical characteristics LDS3985 6/21 DocID11039 Rev 10 4 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 5: LDS3985 electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit VI Operating input voltage 2.5 6 V VO Output voltage < 2.5 V IO = 1 mA -50 50 mV TJ = - 40 to 125 °C -75 75 VO Output voltage ≥ 2.5 V IO = 1 mA -2 2 % VO(NOM) TJ= - 40 to 125 °C -3 3 ∆VO Line regulation (1) VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 125 °C -0.1 0.1 %/V VO = 4.7 to 5 V -0.19 0.19 ∆VO Load regulation IO = 1 mA to 300 mA, VO ≤ 2.5 V TJ = - 40 to 125 °C 0.005 0.01 %/mA ∆VO Load regulation IO = 1 mA to 300 mA, VO ≥ 2.5 V TJ = - 40 to 125 °C 0.0008 0.004 %/mA ∆VO Output AC line regulation (2) VI = VO(NOM) + 1 V, IO = 300 mA, tR = tF = 30 µs 5 mVPP IQ Quiescent current ON mode: VINH = 1.4 V IO = 0 85 µA IO = 0, TJ = - 40 to 125 °C 150 IO = 0 to 300 mA 200 IO = 0 to 300 mA, TJ = - 40 to 125 °C 300 OFF mode: VINH = 0.4 V 0.003 TJ = - 40 to 125 °C 1.5 VDROP Dropout voltage (3) IO = 1 mA 0.4 mV IO = 1 mA, TJ = - 40 to 125 °C 2 IO = 150 mA 60 IO = 150 mA, TJ = - 40 to 125 °C 100 IO = 300 mA 150 IO = 300 mA, TJ = - 40 to 125 °C 250

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LDS3985 Electrical characteristics DocID11039 Rev 10 7/21 Symbol Parameter Test condition Min. Typ. Max. Unit ISC Short-circuit current RL = 0 600 mA SVR Supply voltage rejection VI = VO(NOM)+ 0.25 V ± VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V, VI = 2.55 V f = 1 kHz 55 dB f = 10 kHz 50 IO(PK) Peak output current VO ≥ VO(NOM) - 5% 300 550 mA VINH Inhibit input logic low VI = 2.5 V to 6 V, TJ = - 40 to 125 °C 0.4 V Inhibit input logic high 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 = 2.2 µF 30 µVRMS tON Turn-on time (4) CBYP = 33 nF 240 µs TSHDN Thermal shutdown (5) 160 °C CO Output capacitor Capacitance 2.2 22 µF ESR 5 5000 mΩ Notes: (1)For VO(NOM) < 2 V, VI = 2.5 V. (2)For VO(NOM) = 1.25 V, VI = 2.5 V. (3)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. (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. (5)Typical thermal protection hysteresis is 20 °C.

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Electrical characteristics LDS3985 8/21 DocID11039 Rev 10 Table 6: LDS3985 (automotive grade) electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit VI Operating input voltage 2.5 6 V VO Output voltage < 2.5 V IO = 1 mA -50 50 mV TJ = - 40 to 85 °C -75 75 VO Output voltage ≥ 2.5 V IO = 1 mA -2 2 % VO(NOM) TJ= - 40 to 85 °C -3 3 ∆VO Line regulation (1) VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 85 °C -0.1 0.1 %/V VO = 4.7 to 5 V -0.19 0.19 ∆VO Load regulation IO = 1 mA to 300 mA, VO ≤ 2.5 V TJ = - 40 to 85 °C 0.005 0.01 %/mA ∆VO Load regulation IO = 1 mA to 300 mA, VO ≥ 2.5 V TJ = - 40 to 85 °C 0.0008 0.004 %/mA ∆VO Output AC line regulation (2) VI = VO(NOM) + 1 V, IO = 300 mA tR = tF = 30 µs 5 mVPP IQ Quiescent current ON mode: VINH = 1.4 V IO = 0 85 µA IO = 0, TJ = - 40 to 85 °C 150 IO = 0 to 300 mA 200 IO = 0 to 300 mA, TJ = - 40 to 85 °C 300 OFF mode: VINH = 0.4 V 0.003 TJ = - 40 to 85 °C 1.5 VDROP Dropout voltage (3) IO = 1 mA 0.4 mV IO = 1 mA, TJ = -40 to 85 °C 2 IO = 150 mA 60 IO = 150 mA, TJ = - 40 to 85 °C 100 IO = 300 mA 150 IO = 300 mA, TJ = - 40 to 85 °C 250 ISC Short-circuit current RL = 0 600 mA SVR Supply voltage rejection VI = VO(NOM) + 0.25 V ± VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V VI = 2.55 V f = 1 kHz 55 dB f = 10 kHz 50

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LDS3985 Electrical characteristics DocID11039 Rev 10 9/21 Symbol Parameter Test condition Min. Typ. Max. Unit IO(PK) Peak output current VO ≥ VO(NOM) - 5% 300 550 mA VINH Inhibit input logic low VI = 2.5 V to 6 V, TJ = - 40 to 85 °C 0.4 V Inhibit input logic high 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 = 2.2 µF 30 µVRMS tON Turn-on time (4) CBYP = 33 nF 240 µs TSHDN Thermal shutdown (5) 160 °C CO Output capacitor Capacitance 2.2 22 µF ESR 5 5000 mΩ Notes: (1)For VO(NOM) < 2 V, VI = 2.5 V. (2)For VO(NOM) = 1.25 V, VI = 2.5 V. (3)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. (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. (5)Typical thermal protection hysteresis is 20 °C.