Features
• Hyper Speed Control® architecture enables
- High Delta V Operation (VIN = 28V and VOUT
= 0.8V)
- Small Output Capacitance
• Input Voltage Range: 4.5V to 28V
• Output Current Up to 9A
• Up to 95% Efficiency
• Adjustable Output Voltage from 0.8V to 5.5V
• ±1% FB Accuracy
• Any Capacitor™ Stable: Zero-to-High ESR
• 600 kHz Switching Frequency
• No External Compensation
• Power Good (PG) Output
• Foldback Current-Limit and “Hiccup Mode”
Short-Circuit Protection
• Safe Start-Up into Pre-Biased Loads
• –40°C to +125°C Junction Temperature Range
• Available in a 28-Lead 5 mm x 6 mm VQFN
Package
Applications
• Distributed Power Systems
• Communications/Networking Infrastructure
• Set-Top Box, Gateways, and Routers
• Printers, Scanners, Graphics Cards, and Video
Cards
General Description
The MIC26901 is a constant-frequency, synchronous
buck regulator that features a unique adaptive on-time
control architecture. The MIC26901 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 0.8V with an
ensured accuracy of ±1%, and the device operates at
a switching frequency of 600 kHz.
Microchip’s 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 MIC26901 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, 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.