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MIC2127A Datasheet(PDF) 1 Page - Microchip Technology |
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MIC2127A Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 38 page  2016 Microchip Technology Inc. DS20005676B-page 1 MIC2127A Features • Hyper Speed Control® Architecture Enables: - High Input to Output Voltage Conversion Ratio Capability - Any Capacitor™ Stable - Ultra-Fast Load Transient Response • Wide 4.5V-75V Input Voltage Range • Adjustable Output Voltage from 0.6V to 30V • 270 kHz-800 kHz Programmable Switching Fre- quency • Built-In 5V Regulator for Single-Supply Operation • Auxiliary Bootstrap LDO for Improving System Efficiency • Internal Bootstrap Diode • Selectable Light Load Operating Mode • Enable Input and Power Good Output • Programmable Current Limit • Hiccup Mode Short-Circuit Protection • Soft Start, Internal Compensation and Thermal Shutdown • Supports Safe Start-Up into a Prebiased Output Applications • Networking/Telecom Equipment • Base Station, Servers • Distributed Power Systems • Industrial Power Supplies General Description The MIC2127A is a constant-frequency synchronous buck controller featuring a unique adaptive on-time control architecture. The MIC2127A operates over an input voltage range from 4.5V-75V. The output voltage is adjustable down to 0.6V with an accuracy of ±1%. The device operates with programmable switching frequency from 270 kHz-800 kHz. The MIC2127A features a MODE pin that allows the user to select either Continuous Conduction mode or Hyper Light Load (HLL) mode under light loads. An auxiliary bootstrap LDO improves the system efficiency by supplying the MIC2127A internal circuit bias power and gate drivers from the output of the converter. A logic level enable (EN) signal can be used to enable or disable the controller. The MIC2127A can start-up monotonically into a prebiased output. The MIC2127A features an open drain power good signal (PG) that signals when the output is in regulation and can be used for simple power supply sequencing. The MIC2127A offers a full suite of protection features to ensure protection of the IC during Fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, “hiccup” mode short-circuit protection, internal soft start of 5 ms to reduce inrush current during start-up and thermal shut- down. The MIC2127A is available in a 16-pin 3 mm x 3 mm VQFN package, with an operating junction temperature range from –40°C to +125°C. Typical Application PVDD VDD PG EN MODE FREQ EXTVDD FB ILIM SW BST VIN VIN 4.5V * to 75V VOUT 5V@5A VOUT VIN 4.7 μF 2.2 μFX3 47 μF 10 μH 0.1 μF 0.1 μF 4.7 nF 1 μF 4.7 μF 10 36 k 7.5 k 1 k 100 k 60 k 1.3 k VIN MIC2127A PGND AGND DH DL 330 μF + 0.1 μF Q1 Q2 Q1,Q3: SiR878ADP L1: SRP1265A-100M, Bourns C1: 10SVP330M *Output voltage follows input voltage when the input is below the target output voltage L1 C1 VDD 75V, Synchronous Buck Controller Featuring Adaptive On-Time Control |
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