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AS3642 Datasheet(PDF) 5 Page - ams AG |
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AS3642 Datasheet(HTML) 5 Page - ams AG |
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5 / 27 page  www.austriamicrosystems.com/AS3642 1.2-2 4 - 26 AS3642 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics VVIN = +2.7V to +5.5V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB = +25ºC, unless otherwise specified. Table 3. Electrical Characteristics Symbol Parameter Condition Min Typ Max Unit General Operating Conditions VVIN Supply Voltage 2.7 3.7 4.5 V VVINREDUCE D_FUNC Supply Voltage AS3642 functionally working, but not all parameters fulfilled 1 2.5 5.0 V ISHUTDOWN Shutdown Current SCL=L, SDA=L, VVIN<3.7V, 0ºC < TAMB < 50ºC 0.5 1.0 µA ISTANBY Standby Current interface active, VVIN<3.7V 0.5 5 µA TAMB Operating Temperature -30 25 85 ºC DCDC Step Up Converter VVOUT DCDC Boost output Voltage (pin VOUT) For high supply voltages the output voltage can reach up to VVOUTMAX (the AS3642 always runs in PWM mode unless VVOUT>VVOUTMAX or during startup) 2.8 4.7 V Eta Efficiency ILED_OUT=300mA,VVOUT=4.2V 82 % fCLK Operating Frequency All internal timings are derived from this oscillator -7.5% 4.0 +7.5% MHz DCDC operating frequency for short pulses (close to 100% operating mode) -7.5% 1.0 +7.5% Current Source ILED_OUT LED_OUT current source output 0500 mA ILED_OUT LED_OUT current source accuracy ILED_OUT=300mA -7 +7 % ILED_OUT RAMP LED_OUT ramp time at ILED_OUT=300mA Ramp-up During startup 0.6 1.0 ms Ramp-down after AS3642 is disabled by interface 0.2 0.7 ms ILED_OUT RIPPLE LED_OUT current ripple ILED_OUT = 300mA 10 mAPP VILED_COMP LED_OUT current source voltage compliance Minimum voltage between pin VOUT and LED_OUT for operation of the current source (applicable for current_mode=00, 01 and10) 210 350 mV Protection and Fault Detection Functions (see page 10) VVOUTMAX VVOUT overvoltage protection DCDC Converter Overvoltage Protection 5.0 5.25 5.5 V ILIMIT Current Limit for coil LDCDC (Pin SW) measured at 50% PWM duty cycle 2 maximum 40000s lifetime operation in overcurrent limit 0.7 0.8 0.9 A VLEDSHORT Flash LED short circuit detection voltage Voltage measured on pin LED_OUT 1.45 1.65 V |
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