Maker : National Semiconductor
Part No. : LM3354-37

  Datasheet PDF : LM3354-37.pdf
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Product Information

LM3354-3.7 Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter November 2002 LM3354-3.7 Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter General Description The LM3354 is a CMOS switched capacitor DC/DC converter that produces a regulated output voltage by automatically stepping up (boost) or stepping down (buck) the input voltage. It accepts an input voltage between 2.5V and 5.5V. The LM3354 is also available with standard output voltages of 1.8V, 3.3V, 3.7V, 4.1V (ideal for white LED applications), and 5.0V. If other output voltage options between 1.8V and 5.0V are desired, please contact your National Semiconductor representative. The LM3354’s proprietary buck-boost architecture enables up to 90mA of load current at an average efficiency greater than 75%. Typical operating current is only 375 µA and the typical shutdown current is only 2.3 µA. The LM3354 is available in a 10-pin MSOP package. This package has a maximum height of only 1.1 mm. The high efficiency of the LM3354, low operating and shutdown currents, small package size, and the small size of the overall solution make this device ideal for battery powered, portable, and hand-held applications. See the LM3352 for up to 200mA of output current or the LM3355 for up to 50mA of output current. Features n Regulated VOUT with ± 3% accuracy n Standard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V also available n Custom output voltages available from 1.8V to 5.0V in 100 mV increments with volume order n 2.5V to 5.5V input voltage range n Up to 90mA output current n > 75% average efficiency n Uses few, low-cost external components n Very small solution size n 375 µA typical operating current n 2.3 µA typical shutdown current n 1 MHz typical switching frequency n Architecture and control methods provide high load current and good efficiency n MSOP-10 package n Over-temperature protection Applications n White LED display backlights n 1-cell Lilon battery-operated equipment including PDAs, hand-held PCs, cellular phones n Flat panel displays n Hand-held instruments n Li-Ion, NiCd, NiMH, or alkaline battery powered systems Typical Operating Circuit 20057301 © 2002 National Semiconductor Corporation DS200573 www.national.com LM3354-3.7 Connection Diagram 20057302 Top View MSOP-10 Pin Package See NS Package Number MM Ordering Information Order Number LM3354MMX-3.7 LM3354MM-3.7 Package Type MSOP-10 MSOP-10 NSC Package Drawing MUB10A MUB10A Supplied As 3.5k Units, Tape and Reel 1k Units, Tape and Reel Pin Description Pin Number 1 2 3 4 5 6 7 8 9 10 Name VIN C1− C1+ GND GND CFIL SD VOUT C2− C2+ Input Supply Voltage Negative Terminal for C1 Positive Terminal for C1 Ground Ground Filter Capacitor, a 1µF capacitor is recommended. Shutdown, active low Regulated Output Voltage Negative Terminal for C2 Positive Terminal for C2 Function www.national.com 2 LM3354-3.7 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. All Pins Power Dissipation (TA = 25˚C) (Note 2) TJMAX (Note 2) θJA (Note 2) Storage Temperature Lead Temperature (Soldering, 5 sec.) −0.5V to 5.6V Internally Limited 150˚C 250˚C/W −65˚C to +150˚C 260˚C ESD Rating (Note 3) Human Body Model Machine Model 1.5 kV 100V Operating Ratings Input Voltage (VIN) Output Voltage (VOUT) Ambient Temperature (TA) (Note 2) Junction Temperature (T J) (Note 2) 2.5V to 5.5V 1.8V to 5.0V −40˚C to +85˚C −40˚C to +120˚C Electrical Characteristics Limits in standard typeface are for TA = 25˚C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: C1 = C2 = 0.33 µF; CIN = 10 µF; COUT = 10 µF; CFIL = 1 µF; VIN = 3.5V. Parameter LM3354-3.7 Output Voltage (V OUT) VIN = (2.7, 5.5) V IL = (1, 70) mA VIN = (2.8, 4.0) V IL = (1, 90) mA VIN = (4.3, 5.5) V IL = (1, 90) mA Efficiency Outp...

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