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MIC2177 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2177 Datasheet(HTML) 1 Page - Micrel Semiconductor |
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1 / 16 page  April 1999 1 MIC2177 MIC2177 Micrel MIC2177 Micrel MIC2177 2.5A Synchronous Buck Regulator General Description The Micrel MIC2177 is a 200kHz synchronous buck (step- down) switching regulator designed for high-efficiency, bat- tery-powered applications. The MIC2177 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 2.5A output current. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. It also features a shutdown mode that reduces quiescent current to less than 5 µA. The MIC2177 achieves high efficiency over a wide output current range by switching between PWM and skip mode. Operating mode is automatically selected according to output conditions. Switching frequency is preset to 200kHz and can be synchronized to an external clock signal of up to 300kHz. The MIC2177 uses current-mode control with internal current sensing. Current-mode control provides superior line regula- tion and makes the regulator control loop easy to compen- sate. The output is protected with pulse-by-pulse current limiting and thermal shutdown. Undervoltage lockout turns the output off when the input voltage is less than 4.5V. The MIC2177 is packaged in a 20-lead wide power SO package with an operating temperature range of –40 °C to +85 °C. See the MIC2178 for externally selected PWM or skip-mode operation. Typical Application Features • 4.5V to 16.5V input voltage range • Dual-mode operation for high efficiency (up to 96%) PWM mode for > 200mA load current Skip mode for < 200mA load current • 100m Ω internal power MOSFETs at 12V input • 200kHz preset switching frequency • Low quiescent current 1.0mA in PWM mode 500 µA in skip mode < 5 µA in shutdown mode • 100% duty cycle for low dropout operation • Current-mode control Simplified loop compensation Superior line regulation • Current limit • Thermal shutdown • Undervoltage lockout Applications • High-efficiency, battery-powered supplies • Buck (step-down) dc-to-dc converters • Cellular telephones • Laptop computers • Hand-held instruments • Battery Charger BIAS SGND EN COMP PGND FB OUT VIN C3 220µF 10V VOUT 5V/2.5A L1, 33µH C5 10nF C4 0.01µF MIC2177-5.0 AUTO SYNC R7 15k VIN 6V to 16.5V C1 22µF 35V U1 20 18 11 13 14–17 19 12 4–7 3,8 1,2,9 D1 MBRS140 SW 10 ENABLE ON C6 2.2nF AUTO MODE PWM MODE Mode OFF C2 22µF 35V C7 220µF 10V 70 75 80 85 90 95 100 10 100 1000 2500 OUTPUT CURRENT (mA) 5V Output Efficiency V IN = 6V SKIP PWM |
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Similar Description - MIC2177 |
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