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Part: LM3355MM-4.1
Category:
Power Management
-> Regulators
-> Switching Regulators
-> Switched Capacitor Converters
Description: LM3355 - Regulated 50mA Buck-boost Switched Capacitor DC/DC Converter, Package: Mini Soic, Pin Nb=10
Company: National Semiconductor Corporation
Datasheet: Download LM3355MM-4.1 datasheet File size : 113 kB
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Datasheet text preview:
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
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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
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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) JA (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 < 5.5V; 1 mA < ILOAD < 40 mA Efficiency Output Voltage Ripple (Peak-to-Peak) Operating Quiescent Current Shutdown Quiescent Current Switching Frequency SD Input Threshold Low SD Input Threshold High SD Input Current 2.5V < VIN < 5.5V 2.5V < VIN < 5.5V Measured at SD Pin; SD Pin = VIN = 5.5V ILOAD = 10 mA ILOAD= 50 mA ILOAD = 50 mA C OUT = 10 µF ceramic Measured at Pin VIN; I LOAD = 0A (Note 6) SD Pin at 0V (Note 7)
V
% mVP-P
LM3355-ALL OUTPUT VOLTAGE VERSIONS 375 2.3 0.60 0.8 VIN 0.3 1 475 5 1.40 0.2 VIN µA µA MHz V V µA
Note 1: "Absolute Maximum Ratings" indicate limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see "Electrical Characteristics". Note 2: As long as TA +85°C, all electrical characteristics hold true and the junction temperature should remain below +125°C. Note 3: The Human Body Model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The Machine Model is a 200 pF capacitor discharged directly into each pin. Note 4: Typical numbers are at 25°C and represent the most likely norm. Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed by correlation using standard Statistical Quality Control methods (SQC). All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 6: The VOUT pin is forced to 200 mV above the typical VOUT. This is to insure that the internal switches are off. Note 7: The output capacitor COUT is fully discharged before measurement.
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