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MIC2179YSM Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC2179YSM Datasheet(HTML) 3 Page - Micrel Semiconductor |
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3 / 13 page  June 2009 3 M9999-063009 Micrel, Inc. MIC2179 Electrical Characteristics(3) VIN = 7.0V; TA = 25°C, bold indicates –40°C ≤ TA ≤ 85°C; unless noted. Symbol Parameter Condition Min Typ Max Units ISS Input Supply Current PWM mode, output not switching, 1.0 1.5 mA 4.5V ≤ VIN ≤ 16.5V skip mode, output not switching, 600 750 µA 4.5V ≤ VIN ≤ 16.5V VEN = 0V, 4.5V ≤ VIN ≤ 16.5V 1 25 µA VBIAS Bias Regulator Output Voltage VIN = 16.5V 3.10 3.30 3.4 V VFB Feedback Voltage MIC2179 [adj.]: VOUT = 3.3V, ILOAD = 0 1.22 1.245 1.27 V VOUT Output Voltage MIC2179 [adj.]: VOUT = 3.3V, 3.20 3.3 3.40 V 5V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 1A 3.14 3.46 V MIC2179-5.0: ILOAD = 0 4.85 5.0 5.15 V MIC2179-5.0: 4.85 5.0 5.15 6V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 1A 4.75 5.25 V MIC2179-3.3: ILOAD = 0 3.20 3.3 3.40 V MIC2179-3.3: 3.20 3.3 3.40 V 5V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 1A 3.14 3.46 V VTH Undervoltage Lockout upper threshold 4.25 4.35 V VTL lower threshold 3.90 4.15 V IFB Feedback Bias Current MIC2179 [adj.] 60 150 nA MIC2179-5.0, MIC2179-3.3 20 40 µA AVOL Error Amplifier Gain 0.6V ≤ VCOMP ≤ 0.8V 15 18 20 Error Amplifier Output Swing upper limit 0.9 1.5 V lower limit 0.05 0.1 V Error Amplifier Output Current source and sink 15 25 35 µA fO Oscillator Frequency 160 200 240 kHz DMAX Maximum Duty Cycle VFB = 1.0V 100 % tON min Minimum On-Time VFB = 1.5V 300 400 ns SYNC Frequency Range 220 300 kHz SYNC Threshold 0.8 1.6 2.2 V SYNC Minimum Pulse Width 500 ns ISYNC SYNC Leakage VSYNC = 0V to 5.5V –1 0.01 1 µA ILIM Current Limit PWM mode, VIN = 12V 3.4 4.3 5.5 A skip mode 600 mA RON Switch On-Resistance high-side switch, VIN = 12V 160 350 mΩ low-side switch, VIN = 12V 140 350 mΩ ISW Output Switch Leakage VSW = 16.5V 1 10 µA Absolute Maximum Ratings(1) Supply Voltage [100ms transient] (VIN) .........................18V Output Switch Voltage (VSW)...................................................18V Output Switch Current (ISW)......................................... 6.0A Enable, PWM Control Voltage (VEN, VPWM)..................18V Sync Voltage (VSYNC)......................................................6V Operating Ratings(2) Supply Voltage (VIN).......................................4.5V to 16.5V Junction Temperature Range (TJ) ............ –40°C to +125°C |
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