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EC4304BNB2R Datasheet(PDF) 2 Page - E-CMOS Corporation |
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EC4304BNB2R Datasheet(HTML) 2 Page - E-CMOS Corporation |
2 / 11 page PWM Control 1.2A Step-Down Converter EC4304B E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 11 2011/10/06 PIN DESCRIPTION SYMBO L SOT-23 SOT-89 DESCRIPTION LX 1 1 Drain of NDMOS switch GND 2 2 Ground ADJ 3 3 Multi-function On/Off and brightness control pin: • Leave floating for normal operation.(VADJ = VREF = 1.25V giving nominal average output current IOUTnom = 0.1/RS) • Drive with DC voltage (0V < VADJ < 2.5V) to adjust output current from 0% to 200% of IOUTnom • Drive with PWM signal from open-collector or open-drain transistor, to adjust output current. Adjustment range 0% to 100% of IOUTnom for f >10kHz and 0% to 100% of IOUTnom for f < 500Hz ISENS E 4 4 Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom = 0.1/RS VIN 5 5 Input voltage (7V to 30V). Decouple to ground with 10uF or higher X7R ceramic capacitor close to device ABSOLUTE MAXIMUM RATINGS Parameter Symbol Value Unit Voltage on intput pin relative to GND VIN -0.3 to +36 V ISENSE pin Voltage -5 to +0.3 V ADJ and EN pin Voltage -0.3 to +6 V Operating Temperature Rang TA -40 to +125 C Maximum Soldering Temperature (at leads, 10 sec) TLEAD 300 C Storage Temperature Rang TS -65 to +150 C Power Dissipation, PD @ TA = 25°C SOT-23 0.35 W SOT-89 0.5 Package Thermal Resistance, θJA SOT-23 250 °C/W SOT-89 200 |
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