MIC3809 MICREL, MIC3809 Datasheet
MIC3809
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MIC3809 Summary of contents
Page 1
... The high-speed internal 4MHz error amplifier allows MIC3808/9 operation up to 1MHz. The MIC3808 has a turn-on threshold of 12.5V whereas the MIC3809 has a lower turn-on threshold of 4.3V. Both devices are available in SOP-8 and MSOP-8 package options with an operating range of –40°C to +85°C. ...
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... MIC3808/3809 Ordering Information Part Number Standard Lead-Free MIC3808BM MIC3808YM MIC3809BM MIC3809YM MIC3808BMM MIC3808YMM MIC3809BMM MIC3809YMM Pin Configuration Pin Description Pin Number Pin Name 1 COMP MIC3808/3809 Turn On Turn Off Threshold Threshold Temperature Range 12.5V 8.3V 4.3V 4.1V 12.5V 8.3V 4.3V 4.1V COMP 1 8 VDD OUTA ...
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... MOSFET gate charge (Qg), average OUT current can be calculated from × F, where F is frequency. To OUT prevent noise problems, bypass V to GND with a ceramic capacitor as DD close to the chip as possible. A 1µF decoupling capacitor is recommended. 3 Micrel www.DataSheet4U.com to GND. DD current DD current DD MIC3808/3809 ...
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... OSC ) ......................... –40°C to +85° ...................................................... 160°C .................................................... 206°C/W JA Min Typ Max 180 200 220 0.44 0.5 0.56 1.95 2 2.05 – 0.3 2.5 –0.15 –0.5 3.1 3.6 4 1.9 2.2 2.5 0.45 0.5 0.55 70 200 –200 5 10 0.7 0.75 0.8 0.35 0.8 1.2 0 Micrel Units kHz V/V V µ V April 2005 ...
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... Undervoltage Lockout Section Start Threshold MIC3808, Note 9 MIC3809 Minimum Operating Voltage MIC3808 After Start MIC3809 Hysteresis MIC3808 MIC3809 Soft Start Section COMP Rise Time FB = 1.8V, Rise from 0. Overall Section Startup Current V DD Operating Supply Current 0V, Notes 9 and 10 VDD Zener Shunt Voltage ...
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... V (V) DD MIC3809 Current Limit Threshold vs 0.505 0.503 0.501 0.499 0.497 0.495 0.493 ( Micrel www.DataSheet4U.com MIC3809 Oscillator Variation vs 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0 Pin Capacitance vs. Deadtime 200 175 150 ...
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... Supply Current DD vs. Temperature 10V -40 - 100120140 TEMPERATURE (°C) April 2005 Error Ampifier 120 180 160 100 140 80 120 60 100 Magnitude Phase - 10k 100K 1M 10M 10 100 1k FREQUENCY (Hz) 7 Micrel www.DataSheet4U.com MIC3808/3809 ...
Page 8
... The MIC3808 high-speed power supply controller with push-pull output drive capability. MIC3808 has a higher V turn-on threshold and more hysteresis between V and turn-off than the MIC3809. The outputs of the controller operate in a push-pull fashion with a guaranteed dead time between them. A block diagram of the MIC3808/9 controller is shown in Figure 1 ...
Page 9
... The output of the error amplifier (COMP pin) is limited to typically 3.65V to prevent the COMP pin from rising up too high during startup or during a transient condition. This feature improves the transient response of the power supply. 9 Micrel www.DataSheet4U.com /2) and remains DD dead time dead time ...
Page 10
... additional 0.1uf capacitor between the V oscillator frequency setting resistor and the ground end of the oscillator capacitor may be necessary if the resistor is a distance away from the main 1µF bypass capacitor 10 Micrel www.DataSheet4U.com and GND pins of the MIC3808/ DD end DD April 2005 ...
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... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify ...