MIC4680-3.3YM Micrel Inc, MIC4680-3.3YM Datasheet
MIC4680-3.3YM
Specifications of MIC4680-3.3YM
Available stocks
Related parts for MIC4680-3.3YM
MIC4680-3.3YM Summary of contents
Page 1
... SOIC. The MIC4680 is available in 3.3V and 5V fixed output versions or adjustable output down to 1.25V. The MIC4680 has an input voltage range 34V, with excellent line, load, and transient response. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. In shutdown mode, the regulator draws less than 2µ ...
Page 2
... 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 – ...
Page 3
... 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 ...
Page 4
... 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 ...
Page 5
... 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 ...
Page 6
... 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 ...
Page 7
... 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 ...
Page 8
... 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 ⎛ ...
Page 9
... 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 ...
Page 10
... 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 ...
Page 11
... 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 ...
Page 12
... 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 ...
Page 13
... 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 ...
Page 14
... 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 ...
Page 15
... 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 ...