mic4690 Micrel Semiconductor, mic4690 Datasheet
mic4690
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mic4690 Summary of contents
Page 1
... The MIC4690, housed in an SO-8, can replace larger TO-220 and TO-263 packages in many applications. The MIC4690 allows for a high degree of safety. It has a wide input voltage range 34V, allowing for used in applications where input voltage transients may be present. ...
Page 2
... Pin Description Pin Number Pin Name 1 SHDN 2 VIN 5-8 GND MIC4690 Lead-Free Voltage Temperature Range MIC4690YM Adjustable –40°C to +125°C SHDN 1 8 GND VIN SOP-8 (M) Pin Function Shutdown (Input): Logic low enables regulator. Logic high (>1.5V) shuts down regulator ...
Page 3
... Max 1.217 1.230 1.243 1.205 1.255 1.193 1.230 1.267 1.180 1.280 100 1.5 220 300 450 500 550 1.2 50 500 4 20 1.3 2.5 3.0 2 1.5 1.25 0.8 –10 –0.7 10 –10 –1.5 10 160 MIC4690 Micrel Units µA µA KHz kHz V µ µA µA °C ...
Page 4
... MIC4690 Test Circuit Shutdown Input Behavior MIC4690 Device Under Test +12V 2 3 VIN SHDN FB GND SOP-8 5–8 Current Limit Test Circuit ON GUARANTEED GUARANTEED ON 0.8V 2V TYPICAL ON 0V 1.25V 1.5V Shutdown Hysteresis 4 18µH I OFF OFF TYPICAL OFF V IN(max) Micrel April 2005 ...
Page 5
... V = 5.0V OUT 68 0 0.2 0.4 0.6 0.8 1 1.2 1.4 OUTPUT CURRENT (A) Frequency Foldback vs. Temperature 300 250 200 150 100 V = 12V OUT 100mA OUT 0 - 100 150 Temperature (°C) Shutdown Current vs. Temperature 3 12V SHDN IN 3 OUT 2.5 2.0 1.5 1.0 0.5 0 -40 - 100120140 TEMPERATURE (°C) MIC4690 ...
Page 6
... MIC4690 Functional Characteristics Load Transient TIME (100µs/div) MIC4690 1.5A 0A 100mV V = 12V OUT SOA for MIC4690* 1.4 1 1.0 0.8 0.6 0 OUT T = 50°C 0 125° INPUT VOLTAGE (V) MIC4690BM 1N4148 82‰ SHDN FB 2.2nF GND Snubber Circuit ...
Page 7
... The MIC4690 is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply Voltage The MIC4690 operates from a +4V to +30V (transients to 34V) unregulated input. Highest efficiency operation is from a supply voltage around +12V. See the efficiency curve on page 5. ...
Page 8
... Note 1. All resistors 1% Figure 1b. Recommended Components for Common Ouput Voltages MIC4690 +6.8V to +30V HUTDOWN ENABLE Figure 1a. Adjustable Regulator Circuit 22µF, 35V 2A, 40V 18µH Vishay-Dale Schotty Sumida 595D226X0035D2T SS24 ...
Page 9
... There are two methods of determining the minimum ground plane area required by the MIC4690. Quick Method Make sure that MIC4690 pins 5 though 8 are connected to a ground plane with a minimum area of 6cm plane should be as close to the MIC4690 as possible. The area may be distributed in any shape around the package or on any pcb layer as long as there is good thermal contact to pins 5 though 8 ...
Page 10
... Power SOP-8 µ µ MIC4690 The feedback pin should be kept as far way from the switching elements (usually L1 and D1) as possible. A circuit with sample layouts are provided. See Figures 6a though 6e. Gerber files are available upon request ...
Page 11
... Panasonic 47µF, 50V, 8mm X 11.5mm 2 AVX 22µF, 35V 2 Vishay Vitramon 0.1µF 50V 1 Vishay Sprague 220µF, 10V 3 Micro Commercial Corp Schottky 2A, 40A Diode Inc 4 Sumida 18µH, 1. Micrel Semiconductor 1A 200kHz power-SO-8 buck regulator 11 Micrel Qty SAT 1 MIC4690 ...
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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 MIC4690 MAX) ...