描述 Description

The MIC261203-ZA is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-time control architecture. The MIC261203-ZA operates over an input supply range of 4.5V to 28V and provides a regulated output of up to 12A 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 VINLow 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 MIC261203-ZA offers a full suite of features to ensure protection of the IC during fault conditions. These include undervoltage 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
? 12A output current capability and 95% peak efficiency
? Adjustable output 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 — 6mm QFN package