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CM3708IS Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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CM3708IS Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 6 page  CM3708 3A LOW-NOISE PWM STEP-DOWN REGULATOR 2004/09/15 Rev. 1.2 Champion Microelectronic Corporation Page 4 FUNCTIONAL DESCRIPTION The CM3708 step-down, pulse-width-modulated (PWM), DC-DC converter has an adjustable output range from VREF to the input voltage (VIN). An internal synchronous rectifier improves efficiency and eliminates an external Schottky diode. Fixed-frequency operation enables easy post-filtering, thereby providing excellent noise characteristics. As a result, the CM3708 is an ideal choice for many small wireless systems. VREF The reference voltage could be ranged from 1.1V to VIN. OUPUTS The output voltage pins (LX1, LX2) are tied to the RF power amp, via an external inductor. Output voltage is determined by the VREF inputs. INPUTS The input voltage reference pin, VREF determine the output voltages (LX1, LX2). If a specific voltage is forced at the VREF pin, the output voltage follows the voltage at the VREF pin. OTHER SUPPLY VOLTAGES Several inputs are provided for the supply voltages: PVIN and VIN. The PVIN provide the power supply to the power MOSFETs. VIN provides the voltage supply to the logic section and internal error amplifiers. FEEDBACK The VFB pin is an input that can be used for closed loop compensation. This input is derived from the voltage output. AGND pin is a contact node of internal resistor divider for remote sense. APPLICATION CIRCUIT R2 200k 2 1 C5 470uf/6.3V C3 10uf/6.3V J2 DC-INPUT 1 2 J1 Vout 1 2 U1 CM3708 2 1 3 13 14 15 16 4 5 6 7 8 9 10 11 12 PVIN1 VIN1 LX1 PGND2 LX2 PVIN2 VIN2 PGND1 AGND SD VREF AGSEN AGND NC VFB AGND C12 102 PVIN PVIN VIN L1 3.3uH C9 104 C10 100uf/6.3V C2 104 C11 104 PVIN VREF C6 100uf/6.3V C1 220uf/6.3V R1 5R1 C4 104 VIN R3 1k 2 1 C7 104 C8 104 |
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