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ILC6390 数据表(PDF) 1 Page - Fairchild Semiconductor |
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ILC6390 数据表(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page www.fairchildsemi.com Rev.1.2 ©2001 Fairchild Semiconductor Corporation Features • 85% conversion efficiency at 50mA out • Start-up voltages as low as 900mV • ±2.5% accurate outputs • Complete switch design with only 3 external components • Automatically senses load variations to select the optimal duty cycle and extend conversion efficiency over a wide range • External transistor configuration to run as switcher controller • Shutdown to 0.5µ A Applications • Cellular phones, pagers • Cameras, video recorders • Palmtops and PDAs Description 50 mA boost converter using Pulse Frequency Modulation, or PFM, technique, in 5-lead SOT-89 or a 5-lead SOT-23 package. Only 3 external components are needed to complete the switcher design. The ILC6390 automatically senses load variations to choose between 55% and 75% duty cycles. Normal operation is 55% duty at 155kHz; when load currents exceed the internal comparator trip point, a “turbo mode” kicks in to provide extended on-time switching (75% duty at 100kHz oscillation). Requiring only 30µA of supply current, the ILC6390 achieves efficiencies as high as 85% at 5V yet shuts down to 0.5µA max. Standard voltages offered are 2.5, 3.3, and 5.0V and is available in both a 5 lead SOT-23 and 5 lead SOT-89 package for small footprint applications. In addition, the ILC6391 is configured to drive an external transistor to achieve higher power levels. 2 ILC6390CM 1 3 13 L V IN GND CE SD + C L V OUT ILC6390CP 1 2 3 45 CE V OUT C L + L SD V IN GND ILC6391CM 1 2 3 45 CE V OUT C L + L SD V IN GND R Tr ILC6391CP 1 2 3 45 CE V OUT C L + L SD V IN GND C B R B Tr Figures 1 & 2 L: 100µH (SUMIDA, CD-54) SD: Diode (Schottky diode; MATSUSHITA MA 735) CL: 16V 47µF (Tantalum Capacitor; NICHICON, f93) Figures 3 & 4 L: 47µH (SUMIDA, CD-54) SD: Diode (Schottky diode; MATSUSHITA MA735) CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93) RB: 1k Ω CB: 3300pF Tr: 2SC3279, 2SDI628G Typical Applications ILC6390/91 SOT-89 Step-Up PFM Switcher with Auto-Load Sense ©2001 Fairchild Semiconductor Corporation |
类似零件编号 - ILC6390 |
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类似说明 - ILC6390 |
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