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CM3718IS Datasheet(PDF) 4 Page - Champion Microelectronic Corp. |
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CM3718IS Datasheet(HTML) 4 Page - Champion Microelectronic Corp. |
4 / 10 page CM3718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR FUNCTIONAL DESCRIPTION The CM3718 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 CM3718 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 (LX) 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 (LX). 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 TP1 BNC 1 3 4 VCC R4 470 2 1 L1 3.3uH/2A C2 105 R5 0 R3 100k 2 1 U3 CM3718-8PIN VDD JP1 JUMPER C3 470 D1 SK12 VCC JP2 JUMPER J3 VREF-OUT 1 2 R7 0 2 1 JP3---->USEING EXTERNAL VOLTAGE SETING BOARD (PIN 1,2 SHORT) C4 105 VDD J2 VTT 1 2 NOTE: J1 PWR/IN 1 2 R1 100k 2 1 C7 104 C6 47uf/6.3V C5 104P JP3 CON3 3 2 1 JP4 on/off sw U2 CM-431 1 3 R2 1k 2 1 C1 100uf/6.3V D2 SK12 R8 5.1 2 1 2006/10/11 Rev. 1.6 Champion Microelectronic Corporation Page 4 |
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