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AAT2687 Datasheet(PDF) 4 Page - Advanced Analogic Technologies |
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AAT2687 Datasheet(HTML) 4 Page - Advanced Analogic Technologies |
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4 / 20 page  AAT2687 PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters SystemPowerTM PRODUCT DATASHEET 4 2687.2008.06.1.0 www .analogictech.com AAT2687 PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters SystemPowerTM PRODUCT DATASHEET 4 2687.2008.06.1.0 www .analogictech.com Electrical Characteristics1 VIN1 = 12.0V, VIN2 =3.3V; TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C. Symbol Description Conditions Min Typ Max Units Channel 1: Step-Down Converter VIN1 Input Voltage 6.0 24.0 V VUVLO1 UVLO Threshold VIN1 Rising 5.0 V VIN1 Hysteresis 300 mV VIN1 Falling 3.0 V VOUT1 Output Voltage Range 1.5 5.5 V VFB1 Feedback Pin Voltage TA = 25°C 0.591 0.600 0.609 V VOUT Output Voltage Accuracy IOUT1 = 0A to 4.5A -2.5 2.5 % ΔVOUT/VOUT ΔVIN Line Regulation VIN1 = 6V to 24V, VOUT1 = 3.3V, IOUT1 = 4.5A 0.06 %/V ΔVOUT/VOUT ΔIOUT Load Regulation VIN1 = 12V, VOUT1 = 3.3V, IOUT1 = 0A to 4.5A 0.18 %/A IQ1 Quiescent Current VEN1 = High, No load 0.6 mA ISHDN1 Shutdown Current VEN1 = Low, VL1 = 0V 35.0 μA VOCP1 Over-Current Offset Voltage VEN1 = High, VIN1 = 6.0V to 24.0V, TA = 25°C 80 100 120 mV ILX1 LX Pin Leakage Current VIN1 = 24.0V, VEN1 = Low -1.0 1.0 μA DMAX Maximum Duty Cycle 85 % TON(MIN) Minimum On-Time VIN1 = 6.0 to 24.0V 100 ns RDSON(H) High Side On-Resistance VL1 = 4.5V 35 mΩ FOSC1 Oscillator Frequency 350 490 650 kHz FFOLDBACK1 Short Circuit Foldback Frequency Current Limit Triggered 100 kHz TS1 Start-Up Time From Enable Channel 1 to Output Regulation 2.5 ms Channel 2: 600mA Linear Low Dropout (LDO) Regulator VIN2 Input Voltage 2.7 5.5 V VDO2 Dropout Voltage 98% x VOUT2(NOM), IOUT2 = 600mA 1000 1300 mV IQ2 Quiescent (Ground) Current No load 70 125 μA ISHDN2 Shutdown Current VEN2 = GND 1.0 μA VOUT2(TOL) Output Voltage Tolerance IOUT2 = 1mA to 600mA, VIN2 = 2.7V to 5.5V, TA = 25°C -2.0 +2.0 % IOUT2 = 1mA to 600mA, VIN2 = 2.7V to 5.5V, TA = -40°C to 85°C -3.5 +3.5 % eN Output Noise BW = 300Hz to 50kHz 250 μVRMS PSRR Power Supply Rejection Ratio IOUT2 = 10mA 1kHz 67 dB 10kHz 47 1MHz 45 ILIMIT2 Current Limit 700 800 mA TS2 Enable Start-Up Delay From Enable Channel 2 to Output Regulation 15 μs Over-Temperature, EN Logic TSD1,2 Over-Temperature Shutdown Threshold 135 °C Over-Temperature Shutdown Hysteresis 15 °C VEN1,EN2(L) Enable Threshold Low 0.6 V VEN1(H) Enable Threshold High 2.5 V VEN2(H) Enable Threshold High 1.4 V IEN1,EN2 Input Low Current -1.0 1.0 μA 1. The AAT2687 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range and is assured by design, characterization and correla- tion with statistical process controls. |
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