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Part: LD2985AXX47
Category:
Power Management
-> Regulators
-> Voltage Regulators
Description: Very Low Drop And Low Noise Voltage Regulato With Inhibit Function
Company: ST Microelectronics, Inc.
Datasheet: Download LD2985AXX47 datasheet File size : 447 kB
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Datasheet text preview:
LD2985 SERIES
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
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VERY LOW DROPOUT VOLTAGE (280mV AT 150mA AN D 7mV AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (2mA TYP. AT 150mA LOAD AND 80µA AT NO L OA D ) OUTPUT CURR ENT UP TO 150mA LOGIC CONTROLLED ELECTRONIC S H U T D OW N OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V INTERNAL CURRENT AND THERMAL LIMIT AVAILABLE IN ± 1% TOLLER ANCE (AT 25°C, A VERSION) LOW OUTPUT NOISE VOLTAGE 30µVrms SMALLEST PACKAGE SOT23-5L TEMPERATURE RAN GE: -40°C TO 125°C
SOT23-5L
DESCRIPTION The LD2985 is a 150mA 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 1µA when INHIBIT pin is pulled low. Shutdown Logic C ontrol 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=10nF, connected between bypass pin and GND reduce the noise to 30µVrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
SCHEMATIC DIAGRAM
July 2003
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LD2985 SERIES
AB SOLUTE MAXIMUM RATINGS
Symbol VI VINH IO Ptot Tstg Top DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 16 16 Internally limited Internally limited -65 to +150 -40 to +125 °C °C Unit V V
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
THERMA L DATA
Symbol Rthj-case Parameter Thermal Resistance Junction-case SOT23-5L 81 Unit °C/W
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
Pin N° Symbol 1 2 3 Name and Function
4 SOT23-5L 5
IN Input Port GND Ground Pin 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 0.18V Bypass Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. OUT Output Port
ORDERING CODES
A VERSION LD2985AM15R LD2985AM18R LD2985AM25R LD2985AM28R LD2985AM285R LD2985AM30R LD2985AM31R LD2985AM32R LD2985AM33R LD2985AM35R LD2985AM36R LD2985AM38R LD2985AM40R LD2985AM47R LD2985AM50R B VERSION LD2985BM15R LD2985BM18R LD2985BM25R LD2985BM28R LD2985BM285R LD2985BM30R LD2985BM31R LD2985BM32R LD2985BM33R LD2985BM35R LD2985BM36R LD2985BM38R LD2985BM40R LD2985BM47R LD2985BM50R OUTPUT VOLTAGES 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V
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LD2985 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2985A (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1µF, CO = 1µF, unless otherwise specified)
Symbol V Op VO Parameter Operating Input Voltage Output Voltage VI = 2.5V IO = 1 to 50mA IO = 1 to 50mA VO Output Voltage VI = 2.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.85V IO = 1 to 50mA IO = 1 to 50mA VO Output Voltage VI = 4.0V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.1V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.2V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.3V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.6V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 5.0V IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C TJ= -40 to 125°C Test Conditions Min. 2.5 1.485 1.462 1.447 1.782 1.755 1.737 2.475 2.4375 2.4125 2.772 2.730 2.702 2.821 2.778 2.750 2.970 2.925 2.895 3.069 3.022 2.9915 3.168 3.120 3.088 3.267 3.2175 3.1845 3.465 3.412 3.377 3.564 3.510 3.474 3.762 3.705 3.667 3.96 3.9 3.86 4 3.8 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.5 1.8 1.5 Typ. Max. 16 1.515 1.538 1.553 1.818 1.845 1.863 2.525 2.5625 2.5875 2.828 2.870 2.898 2.879 2.921 2.950 3.030 3.075 3.105 3.131 3.1775 3.2085 3.232 3.280 3.312 3.333 3.3825 3.4155 3.535 3.587 3.622 3.636 3.690 3.726 3.838 3.895 3.933 4.04 4.1 4.14 Unit V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V
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