MIC4690_05 MICREL [Micrel Semiconductor], MIC4690_05 Datasheet
MIC4690_05
Related parts for MIC4690_05
MIC4690_05 Summary of contents
Page 1
MIC4690 General Description The MIC4690 SuperSwitcher™ easy-to-use, 500kHz step-down PWM voltage regulator. The MIC4690 achieves over 1A of continuous output current over a wide input voltage range in an 8-lead SO (small outline) package. The high switching frequency ...
Page 2
MIC4690 Ordering Information Part Number Standard MIC4690BM Pin Configuration 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 ...
Page 3
MIC4690 Absolute Maximum Ratings Supply Voltage (V ), Note 3 ...................................... +34V IN Shutdown Voltage (V ) ............................. –0. SHDN Steady-State Output Switch Voltage (V Feedback Voltage (V ) .............................................. +12V FB Storage Temperature (T ) ....................... –65°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 ...
Page 5
MIC4690 Typical Characteristics Reference Voltage vs. Temperature 1.243 1.241 1.239 1.237 1.235 1.233 1.231 V = 12V 1.229 1.227 OUT I = 100mA 1.225 OUT 1.223 -40 - 100120140 TEMPERTURE (°C) ...
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 ...
Page 7
MIC4690 Block Diagrams SHDN 500kHz Oscillator MIC4690 [adj.] Functional Description 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 ...
Page 8
MIC4690 Applications Information Adjustable Regulators Adjustable regulators require a 1.23V feedback signal. Rec- ommended voltage-divider resistor values for common out- put voltages are included in Figure 1b. For other voltages, the resistor values can be determined using the following formulas: ...
Page 9
MIC4690 Thermal Considerations The MIC4690 SuperSwitcher™ features the power-SOP-8. This package has a standard 8-lead small-outline package profile, but with much higher power dissipation than a stan- dard SOP-8. Micrel's MIC4690 SuperSwitcher™ family are the first dc-to-dc converters to take ...
Page 10
MIC4690 To minimize stray inductance and ground loops, keep trace lengths, indicated by the heavy lines in Figure 5, as short as possible. For example, keep D1 close to pin 3 and pins 5 through 8, keep L1 away from ...
Page 11
MIC4690 Printed Circuit Board Layouts Figure 6b. Top-Side Silk Screen Figure 6c. Top-Side Copper Abbreviated Bill of Material (Critical Components) Reference Part Number C1 595D2260035D2T ECE-A1HFS470 TPSD226M035R0300 C2, C6 VJ0805Y104KXAMB C4 594D227X0010D2T D1 SS24 B240A L1 CDRH6D38-180MC U1 MIC4690BM 1 ...
Page 12
MIC4690 Package Information 0.026 (0.65) 0.157 (3.99) 0.150 (3.81) 0.064 (1.63) 0.045 (1.14) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to ...