LD2985BM285R

LD2985 Very low drop and low noise voltage regulator with inhibit function Datasheet - production data Description SOT23-5L Features • Very low dropout voltage (280 mV at 150 mA and 7 mV at 1 mA load) • Very low quiescent current (2 mA typ. at 150 mA load and 80 µA at no load) • Output current up to 150 mA The LD2985 is a 150 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 µA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). 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. An external capacitor, CBYP = 10 nF, connected between bypass pin and GND reduces the noise to 30 µVrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. • Logic controlled electronic shutdown Table 1. Device summary • Output voltage of 1.8, 2.5, 2.8, 3, 3.1, 3.3, 5 V Order codes Output voltages • Low output noise voltage 30 µVrms LD2985BM18R 1.8 V • Small package SOT23-5L LD2985BM25R 2.5 V • Temperature range: - 40 °C to 125 °C LD2985BM28R 2.8 V LD2985BM30R 3.0 V LD2985BM31R 3.1 V LD2985BM33R 3.3 V LD2985BM50R 5.0 V • Internal current and thermal limit August 2021 This is information on a product in full production. DocID8189 Rev 16 1/18 www.st.com 18 Contents LD2985 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.6 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 DocID8189 Rev 16 LD2985 1 Diagram Diagram Figure 1. Schematic diagram DocID8189 Rev 16 3/18 Pin configuration 2 LD2985 Pin configuration Figure 2. Pin connections (top view) 4 5 1 2 3 SC12360 Table 2. Pin description Pin n° Symbol Name and function 1 IN 2 GND 3 INHIBIT Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18 V 4 Bypass Bypass pin: capacitor to be connected to GND in order to improve the thermal noise performance 5 OUT Input port Ground pin Output port Table 3. Thermal data Symbol 4/18 Parameter Value Unit RthJC Thermal resistance junction-case 81 °C/W RthJA Thermal resistance junction-ambient 255 °C/W DocID8189 Rev 16 LD2985 3 Maximum ratings Maximum ratings Table 4. Absolute maximum ratings Symbol VI VINH Note: Parameter Value Unit DC input voltage -0.3 to 16 V INHIBIT input voltage -0.3 to 16 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 Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. DocID8189 Rev 16 5/18 Electrical characteristics 4 LD2985 Electrical characteristics TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VINH= 2 V, CI = CO = 1 µF, unless otherwise specified. Table 5. Electrical characteristics Symbol VOP VO VO VO VO VO Parameter Operating input voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage VO Load regulation VO ISC Test conditions Output voltage Short-circuit current 6/18 Line regulation Typ. 2.5 1.8 Max. Unit 16 V VI = 2.8 V 1.755 IO = 1 to 150 mA 1.746 1.854 IO = 1 to 150 mA, TJ= -40 to 125 °C 1.728 1.872 VI = 3.5 V 2.437 IO = 1 to 150 mA 2.425 2.575 IO = 1 to 150 mA, TJ= -40 to 125 °C 2.4 2.6 VI = 3.8 V 2.73 IO = 1 to 150 mA 2.716 2.884 IO = 1 to 150 mA, TJ= -40 to 125 °C 2.688 2.912 VI = 4.0 V 2.925 IO = 1 to 150 mA 2.91 3.09 IO = 1 to 150 mA, TJ= -40 to 125 °C 2.88 3.12 VI = 4.1 V 3.023 IO = 1 to 150 mA 3.007 3.193 IO = 1 to 150 mA, TJ= -40 to 125 °C 2.976 3.224 VI = 4.3 V 3.218 IO = 1 to 150 mA 3.201 3.399 IO = 1 to 150 mA, TJ= -40 to 125 °C 3.168 3.432 2.5 2.8 3.0 3.1 3.3 IO = 1 to 150 mA, TJ= -40 to 125 °C 1.845 5.15 IO = 1 to 150 mA, TJ= -40 to 125 °C 4.8 5.2 V mV 5.125 400 DocID8189 Rev 16 V 3.382 4.85 VI = VO + 1 V to 16 V, IO = 1 mA, TJ= -40 to 125 °C V 3.177 IO = 1 to 150 mA 0.003 V 3.075 4.875 RL = 0 V 2.87 20 5 V 2.562 VI = 6.0 V VI = VO + 1 V to 16 V, IO = 1 mA ΔVO/ΔVI Min. V mA 0.014 0.032 %/VI LD2985 Electrical characteristics Table 5. Electrical characteristics (continued) Symbol Parameter Test conditions Min. IO = 0 Typ. Max. 1 3 IO = 0, TJ= -40 to 125 °C 5 IO = 1 mA 7 IO = 1 mA, TJ= -40 to 125 °C VDROP Dropout voltage IO = 10 mA 40 mV 120 IO = 50 mA, TJ= -40 to 125 °C 280 IO = 150 mA, TJ= -40 to 125 °C 80 IO = 0, TJ= -40 to 125 °C 100 IO = 1 mA, TJ= -40 to 125 °C 200 IO = 10 mA, TJ= -40 to 125 °C µA 600 IO = 50 mA, TJ= -40 to 125 °C 2000 IO = 150 mA, TJ= -40 to 125 °C 0 VINH