MIC4680-3.3BM Micrel Inc, MIC4680-3.3BM Datasheet
MIC4680-3.3BM
Specifications of MIC4680-3.3BM
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MIC4680-3.3BM Summary of contents
Page 1
... Frequency compensation is provided internally for fast transient response and ease of use. The MIC4680 is available in the 8-pin SOIC with a –40°C to +125°C junction temperature range. Typical Application MIC4680-3.3BM +6V to +34V 15µF ...
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... Micrel, Inc. Ordering Information Part Number Standard Pb-Free MIC4680BM MIC4680YM MIC4680-3.3BM MIC4680-3.3YM MIC4680-5.0BM MIC4680-5.0YM Pin Configuration Pin Description Pin Number Pin Name 1 SHDN 2 VIN – 8 GND March 2008 Voltage Junction Temp. Range Adj. –40°C to +125°C 3.3V –40°C to +125°C 5.0V – ...
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... Feedback Voltage [Adjustable] (V Storage Temperature (T ) .........................–65°C to +150°C s (5) EDS Rating Electrical Characteristics V = 12V 500mA 25°C, bold values indicate –40°C ≤ LOAD J Parameter Condition MIC4680 [Adjustable] Feedback Voltage (±1%) (±1%) 8V ≤ Maximum Duty Cycle V = 1.0V FB Output Leakage Current V = 34V 34V, V ...
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... March 2008 = +125°C. J Device Under Test +12V SHDN FB GND SOIC-8 5–8 Current Limit Test Circuit 0.8V 1V 1.6V Shutdown Hysteresis 4 Min Typ 2 1.6 1.0 –10 –0.5 –10 –1.5 160 68µ OFF 2V V IN(max) MIC4680 Max Units V 0 µA 10 µA °C M9999-032808 ...
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... OUT 1.228 -50 - 100 125 150 TEMPERATURE (°C) 5V Output Efficiency 24V 60 12V 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT CURRENT (A) 5 MIC4680 Shutdown Current vs. Input Voltage 100 INPUT VOLTAGE (V) Frequency vs. Supply Voltage 202 201 200 199 198 197 196 SUPPLY VOLTAGE (V) Saturation Voltage vs ...
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... Micrel, Inc. Functional Characteristics Frequency Foldback The MIC4680 folds the switching frequency back during a hard short-circuit condition to reduce the energy per cycle and protect the device. March 2008 Safe Operating Area 1.5 Minimum 1.4 Current Limit 1.3 1.2 1.1 1.0 0.9 ...
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... Micrel, Inc. Bode Plots The following bode plots show that the MIC4680 is stable over all conditions using a 68µF inductor (L) and a 220µF output capacitor ( assure stability good practice to maintain a phase margin of greater than 35°. OUT March 2008 7 MIC4680 M9999-032808 ...
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... Com- parator Reset Error 1.23V Amp Bandgap Reference MIC4680-x.x GND Fixed Regulator Internal Regulator 200kHz Thermal Current Oscillator Shutdown Com- parator Reset Error 1.23V Amp Bandgap Reference MIC4680 [adj.] Adjustable Regulator Current Limit SW Driver 1A Switch ⎛ ⎜ OUT REF ⎝ R2 ⎛ ...
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... A lower feedback voltage increases the duty cycle. The MIC4680 uses a voltage- mode control architecture. Output Switching When the internal switch is on, an increasing current ...
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... OUT − REF 60V Schottky B260A Vishay-Diode, Inc*** or SS26 General Semiconductor 10 MIC4680BM SHDN FB ENABLE GND 5–8 Figure 1a. Adjustable Regulator Circuit L1 68µH 1.5A Coiltronics UP2B-680 or Sumida CDRH125-680MC** or Sumida CDRH124-680MC** MIC4680 L1 V OUT R1 C OUT OUT 220µF 10V AVX TPSE227010R0060 M9999-032808 ...
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... Figure 3. Output Current vs. Ground Plane Area When designing with the MIC4680 good practice to connect pins 5 through 8 to the largest ground plane 2 that is practical for the specific design. . This Checking the Maximum Junction Temperature: For this example, with an output power (P ...
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... Increasing the Maximum Output Current The maximum output current at high input voltages can be increased for a given board layout. The additional three components shown in Figure 4 will reduce the overall loss in the MIC4680 by about 20% at high V and high I . OUT Even higher output current can be achieved by using the MIC4680 to switch an external FET ...
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... AVX 220µF 10V 3 Vishay-Diodes, Inc. Schottky General Semiconductor 4 Coiltronics 68µH, 1.5A, nonshielded 5 Sumida 68µH, 1.5A, nonshielded Sumida 68µH, 1.5A, shielded (6) Micrel 1A 200kHz power-SO-8 buck regulator 13 Figure 6d. Bottom-Side Silk Screen Figure 6e. Bottom-Side Copper M9999-032808 MIC4680 Qty ...
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... Micrel, Inc. Application Circuits For continuously updated circuits using the MIC4680, see Application Hint 37 at www.micrel.com. J1 +34V max. Figure 7. Constant Current and Constant Voltage Battery Charger +4.5V to +17V U1 MIC4680BM MIC4417BM4 SHDN GND SOIC-8 5–8 March 2008 Figure 8. +12V to –12V/150mA Buck-Boost Converter ...
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... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully March 2008 8-Pin SOIC (M) indemnify Micrel for any damages resulting from such use or sale. © 2000 Micrel, Incorporated. 15 MIC4680 M9999-032808 ...