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MIC2182-5.0YSM Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2182-5.0YSM Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 28 page April 22, 2004 1 M9999-042204 MIC2182 Micrel MIC2182 High-Efficiency Synchronous Buck Controller General Description Micrel’s MIC2182 is a synchronous buck (step-down) switch- ing regulator controller. An all N-channel synchronous archi- tecture and powerful output drivers allow up to a 20A output current capabilty. The PWM and skip-mode control scheme allows efficiency to exceed 95% over a wide range of load current, making it ideal for battery powered applications, as well as high current distributed power supplies. The MIC2182 operates from a 4.5V to 32V input and can operate with a maximum duty cycle of 86% for use in low- dropout conditions. It also features a shutdown mode that reduces quiescent current to 0.1 µA. The MIC2182 achieves high efficiency over a wide output current range by automatically switching between PWM and skip mode. Skip-mode operation enables the converter to maintain high efficiency at light loads by turning off circuitry pertaining to PWM operation, reducing the no-load supply current from 1.6mA to 600 µA. The operating mode is inter- nally selected according to the output load conditions. Skip mode can be defeated by pulling the PWM pin low which reduces noise and RF interference. The MIC2182 is available in a 16-pin SOP (small-outline package) and SSOP (shrink small-outline package) with an operating range from –40 °C to +85°C. Typical Application VDD BST C6 0.1 µF R1 2k R7 100k VIN 4.5V to 30V* VOUT 3.3V/4A GND C2 2.2nF C4 1nF C3 0.1 µF C5 0.1 µF C1 0.1 µF C9 4.7 µF 16V C11 22uf 35V x2 D2 SD103BWS Q2* Si4884 D1 B140 C7 220uf 10V ×2 L1 10 µH R2 0.02 Ω Q1* Si4884 HSD VSW LSD PGND CSH VOUT VREF SGND GND MIC2182-3.3BSM VIN EN/UVLO SS PWM COMP SYNC C13, 1nF 10 6 2 1 3 5 4 7 9 8 12 13 15 16 14 11 * 30V maximum input voltage limit is due to standard 30V MOSFET selection. See “Application Information” section for 5V to 3.3V/10A and other circuits. 4.5V–30V* to 3.3V/4A Converter Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com Features • 4.5V to 32V Input voltage range • 1.25V to 6V Output voltage range • 95% efficiency • 300kHz oscillator frequency • Current sense blanking • 5 Ω impedance MOSFET Drivers • Drives N-channel MOSFETs • 600 µA typical quiescent current (skip-mode) • Logic controlled micropower shutdown (I Q < 0.1µA) • Current-mode control • Cycle-by-cycle current limiting • Built-in undervoltage protection • Adjustable undervoltage lockout • Easily synchronizable • Precision 1.245V reference output • 0.6% total regulation • 16-pin SOP and SSOP packages • Frequency foldback overcurrent protection • Sustained short-circuit protection at any input voltage • 20A output current capability Applications • DC power distribution systems • Notebook and subnotebook computers • PDAs and mobile communicators • Wireless modems • Battery-operated equipment |
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