Features • Regulated VOUT with ±3% accuracy • Standard output voltage options: 2.5V, 3.0V and 3.3V • Custom output voltages available from 1.8V to 4.0V in 100 mV increments • 2.5V to 5.5V input voltage • Up to 200 mA output current • >80% average efficiency • Uses few, low-cost external components • Very small solution size • 400 µA typical operating current • 2.5 µA typical shutdown current • 1 MHz switching frequency (typical) • Architecture and control methods provide high load current and good efficiency • TSSOP-16 package • Over-temperature protection Description The LM3352 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 LM3352 is available in three standard output voltage versions: 2.5V, 3.0V and 3.3V. If other output voltage options between 1.8V and 4.0V are desired, please contact your National Semiconductor representative. The LM3352's proprietary buck-boost architecture enables up to 200 mA of load current at an average efficiency greater than 80%. Typical operating current is only 400 µA and the typical shutdown current is only 2.5 µA. The LM3352 is available in a 16-pin TSSOP package. This package has a maximum height of only 1.1 mm. The high efficiency of the LM3352, 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. Applications • 1-cell Lilon battery-operated equipment including PDAs, hand-held PCs, cellular phones • Flat panel displays • Hand-held instruments • NiCd, NiMH, or alkaline battery powered systems • 3.3V to 2.5V and 5.0V to 3.3V conversion

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Typical Application click for larger image	Connection Diagram click for larger image
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Datasheet

Title		Size	Date	Other Language
	LM3352 Regulated 200 mA Buck-Boost Switched Capacitor DC/DC Converter	545 Kbytes	20-Oct-04

Featured Application Notes

Title		Size	Date	Other Language
	AN-1144: Application Note 1144 Maximizing Start-up Loads with the LM3352 Regulated Buck/Boost Switched Capacitor Converter	62 Kbytes	4-Oct-04

More Application Notes

Title		Size	Date	Other Language
	AN-1142: Application Note 1142 LM2661/3/4 Evaluation Board	186 Kbytes	4-Oct-04
	AN-225: Application Note 225 IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation	89 Kbytes	2-Oct-02
	AN-1214: Application Note 1214 LM3354/5 Evaluation Board	167 Kbytes	10-May-04
	AN-272: Application Note 272 Op Amp Booster Designs	382 Kbytes	2-Oct-02
	AN-295: Application Note 295 A High Performance Industrial Weighing System	117 Kbytes	4-Oct-04
	AN-298: Application Note 298 Isolation Techniques for Signal Conditioning	379 Kbytes	2-Oct-02
	AN-286: Application Note 286 Applications of the LM392 Comparator Op Amp IC	135 Kbytes	2-Oct-02
	AN-1251: Application Note 1251 Switched Capacitor Circuits Provide Efficient and Functional White LED Drive	55 Kbytes	26-Sep-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM3352MTC-2.5/NOPB RoHS	TSSOP	Lifetime buy Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.79 each at 1K+ pcs	rail of 92
LM3352MTC-3.0/NOPB RoHS	TSSOP	Lifetime buy Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 81	$1.79 each at 1K+ pcs	rail of 92

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM3352MTC-2.5	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM3352MTC-3.0	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM3352MTC-3.3	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3352MTC-2.5	CS065	2	38968	52	0	4402000	1	1249079519
LM3352MTC-3.0	CS065	2	38968	52	0	4402000	1	1249079519
LM3352MTC-3.3	CS065	2	38968	52	0	4402000	1	1249079519

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM3352MTC-2.5	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM3352MTC-3.0	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM3352MTC-3.3	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008