MIC24051
12V, 6A High-Efficiency Buck Regulator
®
with Hyper Speed Control
Features
General Description
• Hyper Speed Control® Architecture Enables:
The MIC24051 is a constant-frequency, synchronous
buck regulator featuring a unique adaptive on-time
control architecture. The MIC24051 operates over an
input supply range of 4.5V to 19V and provides a
regulated output of up to 6A of output current. The
output voltage is adjustable down to 0.8V with a
guaranteed accuracy of ±1%, and the device operates
at a switching frequency of 600 kHz.
- High Delta V Operation (VIN = 19V and VOUT
= 0.8V)
- Small Output Capacitance
• 4.5V to 19V Voltage Input
• 6A Output Current Capability, up to 95%
Efficiency
• Adjustable Output from 0.8V to 5.5V
• ±1% Feedback Accuracy
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.
• 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
The MIC24051 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.
• Supports Safe Start-Up into a Pre-Biased Load
• –40°C to +125°C Junction Temperature Range
• Available in a 28-pin 5 mm x 6 mm QFN Package
Applications
• Servers and Workstations
• Routers, Switches, and Telecom Equipment
• Base Stations
The 6A HyperLight Load® part, MIC24052, is also
available on Microchip’s web site.
Typical Application Schematic
MIC24051
28-PIN QFN
MIC24051
VDD
PVDD
2.2μF
BST
0.1μF
SGND
10k
10k
2.2μH
0.1μF
19.6k
VOUT
1.8V/6A
SW
CS
PG
PG
VIN
VIN
PVIN
4.7nF
4.5V TO 19V
100μF
4.7μF
x2
2.49k
2.00k
PGND
EN
FB
EN
2016 Microchip Technology Inc.
DS20005658A-page 1