MIC26903Z数据手册Microchip中文资料规格书

描述 Description

The MIC26903-ZA is a constant-frequency, synchronous buck regulator featuring a unique adaptive ON-time control architecture. The MIC26903-ZA operates over an input supply range of 4.5V to 28V and provides a regulated output of up to 9A of output current. The output voltage is adjustable down to 0.6V with a guaranteed accuracy of ±1%, and the device operates at a switching frequency of 600kHz.Hyper Speed Control™ architecture allows for ultra-fast transient response while reducing the output capacitance and also makes (High VIN)/(Low VOUT) operation possible. This adaptive tON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device.The MIC26603-ZA offers a full suite of features to ensure protection of the IC during fault conditions. These include under voltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, \"hiccup mode\" short-circuit protection, and thermal shutdown. An open-drain Power Good (PG) pin is provided.

特性 Features

• Hyper Speed Control™ architecture enables
•High Delta V operation (VIN = 28V and VOUT = 0.6V)
•Small output capacitance
• 4.5V to 28V voltage input
• 9A output current capability and 95% peak efficiency
• Adjustable output voltage from 0.6V to 5.5V
• ±1% feedback accuracy
• Any Capacitor™ stable - zero-to-high ESR
• 600kHz switching frequency
• No external compensation
• Power Good (PG) output
• Foldback I-limit and \"hiccup\" mode short-circuit protection
• Supports safe startup into a pre-biased load
• -40°C to +125°C junction temperature range
• Available in 28-pin 5mm x 6mm QFN package