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LTC3448 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3448 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LTC3448 3448f ■ High Efficiency: Up to 96% ■ Very Low Quiescent Supply Current: 32 µA During Linear Regulator Operation ■ 600mA Output Current (Buck Converter) ■ Optionally Operates as Linear Regulator Below 3mA—External or Automatic ON/OFF ■ 2.5V to 5.5V Input Voltage Range ■ 1.5MHz or 2.25MHz Constant Frequency Operation or External Synchronization ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ 0.6V Reference Allows Low Output Voltages ■ Shutdown Mode Draws < 1 µA Supply Current ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Overtemperature Protected ■ Low Profile (3mm × 3mm) 8-Lead DFN and 8-Lead MSOP Packages ■ Cellular Telephones ■ Personal Information Appliances ■ Wireless and DSL Modems ■ Digital Still Cameras ■ MP3 Players ■ Portable Instruments 1.5V High Efficiency Regulator with Automatic LDO Mode 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode Efficiency and Power Loss vs Load Current FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO The LTC ®3448isahighefficiency,monolithic,synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 32 µA (linear regulator mode) and drops to <1 µAinshutdown.The 2.5V to 5.5V input voltage range makes the LTC3448 ide- ally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extend- ing battery life in portable systems. At moderate output load levels, PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. The LTC3448 automatically switches into linear regulator operation at very low load currents to maintain <5mVP-P output voltage ripple. Supply current in this mode is typically 32 µA. The switch to linear regulator mode occurs at a threshold of 3mA. Linear regulator operation can be set to on, off or automatic turn on/off. Switching frequency is selectable at either 1.5MHz or 2.25MHz, allowing the use of small surface mount induc- tors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feed- back reference voltage. The LTC3448 is available in a low profile 3mm × 3mm DFN package or thermally enhanced 8-lead MSOP. VIN 474k 22pF 316k CIN 4.7 µF VIN 2.5V TO 5.5V LTC3448 FREQ SYNC 2.2 µH 3448 TA01a SW RUN VOUT MODE VFB GND COUT 4.7 µF VOUT 1.5V , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131. Others pending. LOAD CURRENT (A) 30 90 100 20 10 80 50 70 60 40 0.0001 0.01 0.1 1 23448 TA01b 0 1 0.1 0.01 0.001 0.0001 0.001 VIN = 3.6V VOUT = 1.5V TA = 25°C POWER LOSS EFFICIENCY |
Similar Part No. - LTC3448_15 |
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Similar Description - LTC3448_15 |
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