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LTC1267-ADJ5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1267-ADJ5 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 1 page 1 LTC1267 LTC1267-ADJ/LTC1267-ADJ5 Dual High Efficiency Synchronous Step-Down Switching Regulators Figure 1. High Efficiency Dual 3.3V, 5V S FEATURE DESCRIPTIO The LTC®1267 series are dual synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. The LTC1267 is composed of two sepa- rateregulatorblocks,eachdrivingapairofexternalcomple- mentary power MOSFETs at switching frequencies up to 400kHz. The LTC1267 uses a constant off-time current- mode architecture to provide constant ripple current in the inductor and provide excellent line and load transient response. A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage,providingsignificantefficiencyimprovementwhen operating at high input voltage. The output current level is user-programmable via an external current sense resistor. The LTC1267 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space. I Dual Outputs: 3.3V and 5V, Two Adjustables or Adjustable and 5V I Wide VIN Range: 4V to 40V I Ultra-High Efficiency: Up to 95% I Low Supply Current in Shutdown: 20 µA I Current Mode Operation for Excellent Line and Load Transient Response I High Efficiency Maintained Over a Wide Output Current Range I Independent Micropower Shutdown I Very Low Dropout Operation: 100% Duty Cycle I Synchronous FET Switching for High Efficiency I Available in Standard 28-Pin SSOP I Notebook and Palmtop Computers I Battery-Operated Digital Devices I Portable Instruments I DC Power Distribution Systems S APPLICATI , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. APPLICATI TYPICAL 1000pF + + + 1000pF PGATE 3 PDRIVE 3 SENSE+ 3 SENSE– 3 SENSE– 5 SHDN3 PDRIVE 5 SHDN5 NGATE 3 PGND3 SGND3 CT3 ITH3 ITH5 CT5 SGND5 PGND5 NGATE 5 SENSE+ 5 PGATE 5 VCC3 VCC VIN CAP3 CAP5 MSHDN VCC5 EXT VCC LTC1267 CT5 270pF 7 11 9 10 15 16 20 22 RC5 1k CC3 3300pF CC5 3300pF CT3 270pF RC3 1k 1 2 3 0.15 µF 0.15 µF 8 1N4148 26 27 1 28 25 24 18 17 19 23 4 5 14 13 12 6 VOUT5 5V 2A COUT5 220 µF 10V × 2 RSENSE5 0.05 Ω P-CH Si9435DY L5 33 µH D5 MBRS140T3 N-CH Si9410DY CIN5 100 µF 50V + 3.3 µF 0.1 µF 0.1 µF CIN3 100 µF 50V P-CH Si9435DY N-CH Si9410DY D3 MBRS140T3 COUT3 220 µF 10V × 2 L3 20 µH RSENSE3 0.05 Ω VOUT3 3.3V 2A VIN 5.4V to 25V RSENSE3: KRL SL-1R050J L3: COILTRONICS CTX20-4 RSENSE5: KRL SL-1R050J L5: COILTRONICS CTX33-4 SHDN3, SHDN5, MSHDN 0V = NORMAL, >2V = SHDN LTC1267 • F01 + 3.3 µF + 1N4148 FOR INFORMATION PURPOSES ONLY OBSOLETE: Contact Linear Technology for Potential Replacement |
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