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ILC6383CIRADJX Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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ILC6383CIRADJX Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 15 page www.fairchildsemi.com REV. 1.2.6 6/13/02 Features • Guaranteed start up in PWM at 0.9V input • Synchronous rectification requires no external diode • True load disconnect from battery input in shutdown • Up to 75mA at 3.3V and 40mA at 5V from 1V input • Up to 375mA at 3.3V and 300mA at 5V from 3V input • Peak efficiency > 90% • 1µA battery input current in shutdown (with VOUT = 0V) • Internal Oscillator frequency: 300kHz to ±15% • ILC6383: Fixed 3.3V or 5V output • ILC6383-ADJ: Adjustable output to 6V maximum • Low battery detector with 100ms transient rejection delay • Powergood output flag when VOUT is in regulation Applications • Cellular Phones, Pagers • Palmtops, PDAs and portable electronics • High efficiency 1V step up converters Description The ILC6383 series of step-up DC-DC converters operate from 1-cell to 3-cell input. They are direct replacement for ILC6382, in applications where SYNC pin is not used. The PFM or PWM operating mode is user selectable through SEL pin connected to ground or left open, respectively. The choice should be dependent upon the current to be delivered to the load: PFM is recommended for input voltage higher than 1.5V and loads below 100mA, while PWM is recom- mended for more than 50mA load current and in noise sensi- tive applications. In shutdown mode, the device allows true load disconnect from battery input. Designed for wireless communications applications, the oscillator frequency is set at 300kHz with no harmonics at sub 20kHz audio band or at 455kHz IF band. Internal synchronous rectification and externally selectable PFM/PWM mode of operation allows the selection of the best efficiency at light or full load. The ILC6383 is capable of delivering 75mA at 3.3V output from a single cell input. The ILC6383-XX offers 3.3V or 5V fixed output voltage while the ILC6383-ADJ allows adjustable output voltage to 6V maximum. Output voltage accuracy is ±3.5% over full operating temperature range. Additional features include power good output (POK) and an internal low battery detector with 100ms transient rejection delay. The device will reject low battery input transients under 100ms in duration. The ILC6383 series is available in a space saving eight lead micro SOP (MSOP-8) package. ILC6383 1-Cell to 3-Cell Boost DC-DC Converter with True Load Disconnect, 3.3V, 5V or Adjustable Output 47 µF ON OFF VIN 1 to 3-cell R5 R6 15 µH L COUT R1 R2 ILC6383-ADJ MSOP-8 LX VIN LBI/SD SEL GND LBO VFB VOUT VOUT VOUT = 1.25 (1+R1/R2) 1 2 3 4 8 7 6 5 CIN + + 47 µF ILC6383-XX 1 3 2 4 8 6 7 5 LX VIN LBI/SD SEL GND LBO POK VOUT ON OFF VIN 1 to 3-cell R5 R6 15 µH MSOP-8 L VOUT 47 µF COUT Low Battery Detector Output Power Good Output CIN + + PWM PFM PWM PFM 47 µF Figure 1. ILC6383CIR-XX Figure 2. ILC6383CIR-ADJ Typical Applications |
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