INTEGRATED CIRCUITS LP2985-XX Micropower 150 mA low noise, low dropout linear regulator Product data File under Integrated Circuits, Standard Analog 2001 Oct 03 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX GENERAL DESCRIPTION The LP2985-XX is a 150 mA, fixed output voltage regulator designed to provide very low dropout and low noise in battery powered and portable applications. The output voltage is preset to 1.8, 2.8, 3.0, 3.3, 3.6, or 5.0 V. Designed with an optimized PNP process, the LP2985-XX achieves unequalled performance in all specifications critical to battery-powered designs such as low supply-current, low dropout voltage, low power consumption, small size, fast dynamic response to line and load, precision output, etc. This regulator consists of an internal voltage reference, an error amplifier, a driver with current limiter and a thermal shut-down mechanism. The LP2985-XX is housed in a SOT23-5 5-lead package. FEATURES APPLICATIONS • Very low consumption current: 85 mA typ. (when not loaded), • Cellular phones, cordless phones, and 2-way radios • Electronic notebooks, PDAs and palmtop computers • Cameras, VCRs and camcorders • PCMCIA cards • Modems • Battery-powered or hand-held instruments 0.1 mA max. (when off) • Very low dropout voltage: 100 mV typ. (IOUT = 50 mA) • High precision output voltage: ±2% • Output current capacity: 150 mA • Low noise: 30 mVRMS @ 20 Hz to 80 kHz (Cn= 10 nF) • Good line regulation: 0.01%/V typ. • Good load regulation: 30 mV typ. (IOUT = 1 to 150 mA) • Low temperature drift co-efficient to VOUT: ±100 ppm/°C • Built-in current limit and thermal shut-down • Wide operating temperature range: –30 to +85 °C • Preset output voltages: 1.8, 2.8, 3.0, 3.3, 3.6, or 5.0 V SIMPLIFIED DEVICE DIAGRAM LP2985-XX VIN 1 3 5 BIAS VOUT CURRENT LIMIT ON/OFF DRIVER REFERENCE NOISE 4 THERMAL SHUTDOWN GND 2 SL01545 Figure 1. Simplified device diagram. 2001 Oct 03 2 853–2291 27197 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX ORDERING INFORMATION PACKAGE TYPE NUMBER LP2985-XXD NAME DESCRIPTION TEMPERATURE RANGE SOT23-5, SOT25, SO5 plastic small outline package; 5 leads (see dimensional drawing) –30 to +85 °C NOTE: The device has five voltage output options, indicated by the XX on the Type Number. XX VOLTAGE (Typical) 18 1.8 V 28 2.8 V 30 3.0 V 33 Part number marking Each device is marked with a four letter code. The first three letters designate the product. The fourth letter, represented by ‘x’, is a date tracking code. Part number Marking LP2985-18D AABx LP2985-28D AACx LP2985-30D ABGx 3.3 V LP2985-33D ABHx 36 3.6 V LP2985-36D ANBx 50 5.0 V LP2985-50D ABJx PIN CONFIGURATION PIN DESCRIPTION PIN 1 GND 2 ON/OFF 5 VOUT LP2985-XX VIN 3 4 SYMBOL DESCRIPTION 1 VIN Voltage input. 2 GND Device ground. 3 ON/OFF ON/OFF control pin. Connect to VIN if not used. 4 NOISE Noise decrease pin, for connecting external capacitor. 5 VOUT Voltage output. NOISE SL01544 Figure 2. Pin configuration. MAXIMUM RATINGS SYMBOL PARAMETER MIN. MAX. UNIT VIN Supply voltage –0.3 +12.0 V Toper Operating temperature –30 +85 °C Tstg Storage temperature –40 +150 °C PD Power dissipation – 150 mW 2001 Oct 03 3 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX ELECTRICAL CHARACTERISTICS Tamb = 25 °C, VIN = VOUT(nom) + 1 V, VON/OFF = 2.0 V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS ICC No-load input current IOUT = 0 mA ICC(OFF) Standby input current VON/OFF VOUT Output voltage MIN. TYP. MAX. UNIT – 85 130 µA – 0 0.1 µA 98 – 102 % Vnom LP2885-18 1.764 1.8 1.836 V LP2885-28 2.744 2.8 2.856 V LP2885-30 2.940 3.0 3.060 V LP2885-33 3.234 3.3 3.366 V LP2885-36 3.528 3.6 3.672 V LP2885-50 4.900 5.0 5.100 V VIN–VOUT Dropout voltage VIN = VOUT(typ) + 1 to 10 V – 0.1 0.2 V ∆VLNR Line regulation VIN = VOUT(typ) + 1 to 10 V – 10 20 mV ∆VLDR Load regulation IOUT = 1 to 150 mA – 30 90 mV ∆VOUT/∆T VOUT temperature coefficient –30 °C ≤ Tj ≤ +85 °C – 100 – ppm/°C RR1 Ripple rejection 1 f = 120 Hz; Vripple = 1 V 50 70 – dB RR2 Ripple rejection 2 f = 1 kHz; Cn = 0.01 µF; Vripple = 1 V – 60 – dB Vn Output noise voltage fBW = 20 Hz to 80 kHz; Cn = 0.01 µF – 30 – µVRMS ION/OFF ON/OFF pin input current VON/OFF = 5.0 V – 5 15 µA VOFF ON/OFF low threshold voltage –0.3 – 0.4 V VON ON/OFF high threshold voltage 1.6 – VIN + 0.3 V 2001 Oct 03 4 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output, resulting in a decrease in output voltage. TECHNICAL DISCUSSION As illustrated in Figure 3, the LP2985-XX consists of a band-gap voltage reference, an error amplifier, P-channel pass transistor, current limit circuit and an internal feedback voltage divider. The output voltage is fed back through an internal resistor voltage divider connected to the VOUT pin. An external bypass capacitor connected to the NOISE pin reduces noise at the output. Additional functional blocks include a current-limiter, thermal sensor and shut-down logic. The current-limiter monitors and controls the pass-transistor’s gate voltage, limiting the output current to its specified maximum value. Thus it can withstand a short-circuited output for an indefinite amount of time without damaging the part. The reference is connected to the error amplifier’s inverting input. The error amplifier compares the reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass transistor’s gate is pulled lower, which allows more current to pass to the output and increase the LP2985-XX VIN 1 3 5 BIAS CURRENT LIMIT ON/OFF DRIVER REFERENCE NOISE 4 THERMAL SHUTDOWN GND 2 SL01545 Figure 3. Block diagram. 2001 Oct 03 5 VOUT Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX good frequency characteristics is needed. Set it as close to the circuit as possible and make the wiring as short as possible. The value of the output capacitance must be at least 1 µF and must have B-type temperature characteristics. Also it must have the ESR (Equivalent Series Resistance) value within the stable range shown in the ESR versus IO plot. APPLICATION INFORMATION The following points have to be kept in mind for good performance while using these devices: Input Capacitor An input capacitor of greater than 1 µF is required between the LP2985-XX input pin and the circuit ground (the amount of capacitance may be increased without limit). This capacitor must be located as close as possible to the VIN or GND pin (not more than 1 cm away from the pin) and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor will work. ON/OFF (Chip Enable) Pin The ON/OFF pin must be actively terminated, not floating. If the function is not to be used, the pin should be tied to VIN. Line Impedance of VIN and GND The VIN and GND lines should be sufficiently wide to minimize impedance. If the impedance of these lines is high, there is a chance to pick up noise or malfunction. Output Capacitor Phase compensation is used for securing stable operation even if the load current varies. For this reason, an output capacitor with OUTPUT VOLTAGE 1 µF 5 4 VOUT NOISE VIN GND ON/OFF 1 2 3 0.01 µF SUPPLY VOLTAGE 1 µF SL01546 Figure 4. Typical application circuit, device always ON. TEST CIRCUITS A 1 µF V TEST LOAD 5 4 VOUT NOISE VIN GND ON/OFF 1 2 3 0.01 µF A A SUPPLY VOLTAGE 1 µF SL01547 Figure 5. Test circuit. 2001 Oct 03 6 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX PACKING METHOD The LP2985-XX is packed in reels, as shown in Figure 6. GUARD BAND TAPE REEL ASSEMBLY TAPE DETAIL COVER TAPE CARRIER TAPE BARCODE LABEL BOX SL01305 Figure 6. Tape and reel packing method 2001 Oct 03 7 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX SOT23-5: plastic small outline package; 5 leads; body width 1.5 mm 1.35 2001 Oct 03 1.2 1.0 0.025 0.55 0.41 0.22 0.08 3.00 2.70 1.70 1.50 0.55 0.35 8 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX NOTES 2001 Oct 03 9 Philips Semiconductors Product data Micropower 150 mA low noise, low dropout linear regulator LP2985-XX Data sheet status Data sheet status [1] Product status [2] Definitions Objective data Development This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A. [1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. Definitions Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Koninklijke Philips Electronics N.V. 2001 All rights reserved. Printed in U.S.A. Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 Date of release: 10-01 For sales offices addresses send e-mail to: [email protected]. Document order number: 2001 Oct 03 10 9397 750 08962