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LT1767EMS8E-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LT1767EMS8E-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1767/LT1767-1.8/ LT1767-2.5/LT1767-3.3/LT1767-5 sn1767 1767fas Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators s 1.5A Switch in a Small MSOP Package s Constant 1.25MHz Switching Frequency s High Power Exposed Pad (MS8E) Package s Wide Operating Voltage Range: 3V to 25V s High Efficiency 0.22 Ω Switch s 1.2V Feedback Reference Voltage s Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V s 2% Overall Output Tolerance s Uses Low Profile Surface Mount Components s Low Shutdown Current: 6 µA s Synchronizable to 2MHz s Current Mode Loop Control s Constant Maximum Switch Current Rating at All Duty Cycles* The LT ®1767 is a 1.25MHz monolithic buck switching regulator. A high efficiency 1.5A, 0.22 Ω switch is included on the die together with all the control circuitry required to complete a high frequency, current mode switching regu- lator. Current mode control provides fast transient re- sponse and excellent loop stability. New design techniques achieve high efficiency at high switching frequencies over a wide operating range. A low dropout internal regulator maintains consistent perfor- mance over a wide range of inputs from 24V systems to Li- Ion batteries. An operating supply current of 1mA im- proves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 6 µA. Maximum switch current remains constant at all duty cycles. Syn- chronization allows an external logic level signal to in- crease the internal oscillator from 1.4MHz to 2MHz. The LT1767 is available in an 8-pin MSOP fused leadframe package and a low thermal resistance exposed pad pack- age. Full cycle-by-cycle short-circuit protection and ther- mal shutdown are provided. High frequency operation allows the reduction of input and output filtering compo- nents and permits the use of chip inductors. s DSL Modems s Portable Computers s Wall Adapters s Battery-Powered Systems s Distributed Power , LTC and LT are registered trademarks of Linear Technology Corporation. Efficiency vs Load Current 12V to 3.3V Step-Down Converter BOOST LT1767-3.3 VIN OUTPUT 3.3V 1.2A* VIN 12V 1767 TA01 C2 0.1 µF CC 1.5nF RC 4.7k D1 UPS120 C1 10 µF CERAMIC C3 2.2 µF CERAMIC D2 CMDSH-3 L1 5 µH VSW FB SHDN OPEN OR HIGH = ON GND VC SYNC *MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING. LOAD CURRENT (A) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1767 TA01a 95 90 85 80 75 70 VIN = 10V VOUT = 5V VIN = 5V VOUT = 3.3V *Patent Pending APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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