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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LTC1625IGN Datenblatt(PDF) 1 Page - Linear Technology |
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LTC1625IGN Datenblatt(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1625 No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator FEATURES DESCRIPTION s Highest Efficiency Current Mode Controller s No Sense Resistor Required s Stable High Current Operation s Dual N-Channel MOSFET Synchronous Drive s Wide VIN Range: 3.7V to 36V s Wide VOUT Range: 1.19V to VIN s ±1% 1.19V Reference s Programmable Fixed Frequency with Injection Lock s Very Low Drop Out Operation: 99% Duty Cycle s Forced Continuous Mode Control Pin s Optional Programmable Soft Start s Pin Selectable Output Voltage s Foldback Current Limit s Output Overvoltage Protection s Logic Controlled Micropower Shutdown: IQ < 30µA s Available in 16-Lead Narrow SSOP and SO Packages The LTC ®1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode TM operation at low load currents reduces switching losses and low dropout operation extends oper- ating time in battery-powered systems. A forced continu- ous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external ca- pacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 3.7V (3.9V for LTC1625I) to 36V at the input and 1.19V to VIN at the output. TYPICAL APPLICATION Figure 1. High Efficiency Step-Down Converter + + VIN TK SYNC LTC1625 RUN/SS VOSENSE TG SW CB 0.22µF DB CMDSH-3 CC 2.2nF RC 10k M2 Si4410DY D1 MBRS140T3 M1 Si4410DY CVCC 4.7µF 1625 F01 L1 10 µH CIN 10 µF 30V ×2 BOOST INTVCC BG ITH VPROG SGND PGND + COUT 100 µF 10V ×3 VOUT 3.3V 4.5A VIN 5V TO 28V CSS 0.1 µF LOAD CURRENT (A) 0.01 80 90 100 0.1 1 10 1625 TA01 70 60 VIN = 10V VOUT = 5V VOUT = 3.3V Efficiency vs Load Current APPLICATIONS s Notebook and Palmtop Computers, PDAs s Cellular Telephones and Wireless Modems s Battery Chargers s Distributed Power , LTC and LT are registered trademarks of Linear Technology Corporation. No RSENSE and Burst Mode are trademarks of Linear Technology Corporation. |
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Ähnliche Beschreibung - LTC1625IGN |
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