Maker : National Semiconductor
Part No. : LM3355

  Datasheet PDF : LM3355.pdf
  Cross Reference : LM3355 Cross Reference
  Buy Component : LM3355 Find Stock and Price

Shortcut : LM335  LM335  LM335  LM3350  LM3350MM  LM3350MMX  LM3351  LM3351MM  LM3351MMX  LM3352  LM3352MTC-2.5  LM3352MTC-3.0  LM3352MTC-3.3  LM3352MTCX-2.5  LM3352MTCX-3.0  LM3352MTCX-3.3  LM3354  LM3354-37  LM3354MM-1.8  LM3354MM-3.3  LM3354MM-3.7  LM3354MM-4.1  LM3354MM-5.0  LM3354MMX-1.8  LM3354MMX-3.3  LM3354MMX-3.7  LM3354MMX-4.1  LM3354MMX-5.0  LM3355  LM335A  LM335A  LM335A  LM335AH  LM335AZ  LM335H  LM335M  LM335Z  LM335Z 

Product Information

LM3355 Regulated 50 mA Buck-Boost Switched Capacitor DC/DC Converter December 2001 LM3355 Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter General Description The LM3355 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 LM3355 is available with a standard output voltage of 4.1V (ideal for white LED applications). If other output voltage options between 1.8V and 4.1V are desired for other applications, please contact your National Semiconductor representative. The LM3355’s proprietary buck-boost architecture enables up to 50 mA 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 LM3355 is available in a 10-pin MSOP package. This package has a maximum height of only 1.1 mm. The high efficiency of the LM3355, 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. Features n Regulated VOUT with ± 3% accuracy n Standard output voltage of 4.1V n Custom output voltages available from 1.8V to 4.1V in 100 mV increments n 2.5V to 5.5V input voltage n Up to 50 mA 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 switching frequency (typical) 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 NiCd, NiMH, or alkaline battery powered systems Typical Operating Circuit DS200219-1 © 2001 National Semiconductor Corporation DS200219 www.national.com LM3355 Connection Diagram DS200219-2 Top View MSOP-10 Pin Package See NS Package Number MUB10A Ordering Information Order Number LM3355MMX-4.1 LM3355MM-4.1 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 LM3355 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 4.1V −40˚C to +85˚C −40˚C to +125˚C Electrical Characteristics Limits in standard typeface are for TA = 25˚C, and limits in boldface type apply over the full operating temperature range of −40˚C ≤ TA ≤ 85˚C. Unless otherwise specified: C1 = C2 = 0.33 µF; CIN = 10 µF; COUT = 10 µF; CFIL = 1 µF; VIN = 3.5V. Parameter LM3355-4.1 Output Voltage (V OUT) Conditions VIN = 3.5V; I = 50 mA Min (Note 5) 4.038 3.977/3.936 3.977/3.936 Typ (Note 4) 4.1 4.1 4.1 80 75 75 Max (Note 5) 4.162 4.223/4.264 4.223/4.264 Units LOAD 2.6V < VIN < 5.5V; 1 mA < ILOAD < 50 mA 2.5V < VIN ...

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