NSC LM3354MMX-5.0, LM3354MMX-3.3, LM3354MMX-1.8, LM3354MM-5.0, LM3354MM-4.1 Datasheet
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February 2002
LM3354
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 available with standard output voltages of 1.8V, 3.3V, 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
nRegulated VOUT with ±3% (5.0V, 4.1V, and 3.3V options) or ±4% (1.8V option) accuracy
nStandard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V
nCustom output voltages available from 1.8V to 5.0V in 100 mV increments with volume order
n2.5V to 5.5V input voltage range
nUp to 90mA (5.0V, 4.1V, and 1.8V options) or 70mA (3.3V option) output current
n>75% average efficiency
nUses few, low-cost external components
nVery small solution size
n375 µA typical operating current
n2.3 µA typical shutdown current
n1 MHz typical switching frequency
nArchitecture and control methods provide high load current and good efficiency
nMSOP-10 package
nOver-temperature protection
Applications
nWhite LED display backlights
n1-cell Lilon battery-operated equipment including PDAs, hand-held PCs, cellular phones
nFlat panel displays
nHand-held instruments
nLi-Ion, NiCd, NiMH, or alkaline battery powered systems
Typical Operating Circuit
DS200188-1
Converter DC/DC Capacitor Switched Boost-Buck 90mA Regulated LM3354
© 2002 National Semiconductor Corporation |
DS200188 |
www.national.com |
LM3354
Connection Diagram
DS200188-2
Top View
MSOP-10 Pin Package
See NS Package Number MM
Ordering Information
Order Number |
Package Type |
NSC Package Drawing |
Supplied As |
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LM3354MMX-5.0 |
MSOP-10 |
MUB10A |
3.5k Units, Tape and Reel |
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LM3354MM-5.0 |
MSOP-10 |
MUB10A |
1k Units, Tape and Reel |
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LM3354MMX-4.1 |
MSOP-10 |
MUB10A |
3.5k Units, Tape and Reel |
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LM3354MM-4.1 |
MSOP-10 |
MUB10A |
1k Units, Tape and Reel |
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LM3354MMX-3.3 |
MSOP-10 |
MUB10A |
3.5k Units, Tape and Reel |
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LM3354MM-3.3 |
MSOP-10 |
MUB10A |
1k Units, Tape and Reel |
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LM3354MMX-1.8 |
MSOP-10 |
MUB10A |
3.5k Units, Tape and Reel |
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LM3354MM-1.8 |
MSOP-10 |
MUB10A |
1k Units, Tape and Reel |
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Pin Description
Pin Number |
Name |
Function |
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1 |
VIN |
Input Supply Voltage |
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2 |
C1− |
Negative Terminal for C1 |
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3 |
C1+ |
Positive Terminal for C1 |
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4 |
GND |
Ground |
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5 |
GND |
Ground |
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6 |
CFIL |
Filter Capacitor, a 1µF capacitor is recommended. |
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7 |
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Shutdown, active low |
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SD |
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8 |
VOUT |
Regulated Output Voltage |
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9 |
C2− |
Negative Terminal for C2 |
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10 |
C2+ |
Positive Terminal for C2 |
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www.national.com |
2 |
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 |
−0.5V to 5.6V |
Power Dissipation (TA = 25ÊC) |
Internally Limited |
(Note 2) |
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TJMAX (Note 2) |
150ÊC |
θJA (Note 2) |
250ÊC/W |
Storage Temperature |
−65ÊC to +150ÊC |
Lead Temperature (Soldering, 5 sec.) |
260ÊC |
ESD Rating (Note 3) |
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Human Body Model |
1.5 kV |
Machine Model |
100V |
Operating Ratings
Input Voltage (VIN) |
2.5V to 5.5V |
Output Voltage (VOUT) |
1.8V to 5.0V |
Ambient Temperature (TA) (Note 2) |
−40ÊC to +85ÊC |
Junction Temperature (T J) (Note 2) |
−40ÊC to +120ÊC |
Electrical Characteristics
Limits in standard typeface are for TA = 25ÊC, 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 |
Conditions |
Min |
Typ |
Max |
Units |
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(Note 5) |
(Note 4) |
(Note 5) |
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LM3354-5.0 |
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Output Voltage (V OUT) |
3.4V < VIN < 5.5V; |
4.85/4.8 |
5.0 |
5.15/5.2 |
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1 mA < ILOAD < 90 mA |
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3.1V < VIN < 5.5V; |
4.85/4.8 |
5.0 |
5.15/5.2 |
V |
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1 mA < ILOAD < 55 mA |
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2.9V < VIN < 5.5V; |
4.85/4.8 |
5.0 |
5.15/5.2 |
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1 mA < ILOAD < 30 mA |
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Efficiency |
ILOAD = 15 mA |
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85 |
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% |
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ILOAD = 40 mA, VIN = 3.8V |
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85 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 10 µF ceramic |
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LM3354-4.1 |
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Output Voltage (V OUT) |
2.9V < VIN < 5.5V; |
3.977/3.936 |
4.1 |
4.223/4.264 |
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1 mA < ILOAD < 90 mA |
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V |
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2.5V < VIN < 5.5V; |
3.977/3.936 |
4.1 |
4.223/4.264 |
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1 mA < ILOAD < 40 mA |
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Efficiency |
ILOAD = 15 mA |
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80 |
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% |
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ILOAD= 70 mA |
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75 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 10 µF ceramic |
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LM3354-3.3 |
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Output Voltage (V OUT) |
2.9V < VIN < 5.5V; |
3.201/3.168 |
3.3 |
3.399/3.432 |
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1 mA < ILOAD < 70 mA |
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V |
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2.5V < VIN < 5.5V; |
3.201/3.168 |
3.3 |
3.399/3.432 |
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1 mA < ILOAD < 70 mA |
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Efficiency |
ILOAD = 15 mA |
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90 |
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% |
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ILOAD= 70 mA |
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70 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 10 µF ceramic |
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LM3354-1.8 |
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Output Voltage (V OUT) |
2.9V < VIN < 5.5V; |
1.728/1.710 |
1.8 |
1.872/1.89 |
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1 mA < ILOAD < 90 mA |
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V |
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2.5V < VIN < 5.5V; |
1.728/1.710 |
1.8 |
1.872/1.89 |
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1 mA < ILOAD < 80 mA |
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Efficiency |
ILOAD = 15 mA |
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75 |
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% |
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ILOAD= 70 mA |
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70 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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25 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 10 µF ceramic |
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LM3354
3 |
www.national.com |
LM3354
Electrical Characteristics (Continued)
Limits in standard typeface are for TA = 25ÊC, 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 |
Conditions |
Min |
Typ |
Max |
Units |
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(Note 5) |
(Note 4) |
(Note 5) |
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LM3354-ALL OUTPUT VOLTAGE VERSIONS |
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Operating Quiescent |
Measured at Pin VIN; |
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375 |
475 |
µA |
Current |
I LOAD = 0A (Note 6) |
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Shutdown Quiescent |
SD Pin at 0V (Note 7) |
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2.3 |
5 |
µA |
Current |
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Switching Frequency |
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0.6 |
1 |
1.4 |
MHz |
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SD Input Threshold Low |
2.5V < VIN < 5.5V |
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0.2 VIN |
V |
SD Input Threshold High |
2.5V < VIN < 5.5V |
0.8 VIN |
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V |
SD Input Current |
Measured at SD Pin; |
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0.3 |
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µA |
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SD Pin = VIN = 5.5V |
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Note 1: ªAbsolute Maximum Ratingsº 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 ªElectrical Characteristicsº.
Note 2: As long as TA ≤ +85ÊC, all electrical characteristics hold true and the junction temperature should remain below +120ÊC except for the 5V output option. The 5V option requires that TA ≤ +60ÊC.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin.
Note 4: Typical numbers are at 25ÊC 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.
Typical Performance Characteristics Unless otherwise specified TA = 25ÊC.
VOUT vs. VIN |
VOUT vs. VIN |
DS200188-41 |
DS200188-42 |
www.national.com |
4 |
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