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MIC2179 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2179 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 16 page June 1998 1 MIC2179 MIC2179 Micrel MIC2179 1.5A Synchronous Buck Regulator General Description The Micrel MIC2179 is a 200kHz synchronous buck (step- down) switching regulator designed for high-efficiency, bat- tery-powered applications. The MIC2179 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 1.5A 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 MIC2179 achieves high efficiency over a wide output current range by operating in either PWM or skip mode. The operating mode is externally selected, typically by an intelli- gent system, which chooses the appropriate mode according to operating conditions, efficiency, and noise requirements. The switching frequency is preset to 200kHz and can be synchronized to an external clock signal of up to 300kHz. The MIC2179 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 MIC2179 and is packaged in a 20-lead SSOP package with an operating temperature range of –40 °C to +85°C. Typical Application BIAS SGND COMP PGND FB SW VIN C2 100µF 6.3V VOUT 3.3V/600mA L1 22µH C4 6.8nF C3 0.01µF MIC 2179-3.3 PWM Skip Mode PWM Mode SYNC EN R2 10k VIN 5.4V to 16.5V C1 10µF 20V U1 15 5 13 8 9–12 14 7 1,2, 19,20 3,4 16,17 D1 MBRM120 PWRGD 6 R1 20k Output Good Output Low Pins 4 and 18 are not connected. Pins 3 and 4 can be connected together for a low-impedance connection. Features • 4.5V to 16.5V input voltage range • Dual-mode operation for high efficiency (up to 96%) PWM mode for > 150mA load current Skip mode for <150mA load current • 150m Ω internal power MOSFETs at 12V input • 200kHz preset switching frequency • Low quiescent current 1.0mA in PWM mode 600 µA in skip mode < 5 µA in shutdown mode • Current-mode control Simplified loop compensation Superior line regulation • 100% duty cycle for low dropout operation • 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 Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com |
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