MIC24051 Datasheet, PDF (1/34 Pages) Micrel Semiconductor – 12V, 6A High-Efficiency Buck Regulator

MIC24051
12V, 6A High-Efficiency Buck Regulator
with Hyper Speed Control^®
Features
• Hyper Speed Control^® Architecture Enables:
- High Delta V Operation (V_IN = 19V and V_OUT
= 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
• 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
• 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
General Description
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.
Microchip’s Hyper Speed Control^® architecture allows
for ultra-fast transient response while reducing the
output capacitance and also makes (High V_IN)/(Low
V_OUT) operation possible. This adaptive t_ON ripple
control architecture combines the advantages of
fixed-frequency operation and fast transient response
in a single device.
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.
The 6A HyperLight Load^® part, MIC24052, is also
available on Microchip’s web site.
Typical Application Schematic
MIC24051
28-PIN QFN
2.2μF
10k
PG
V_IN
4.5V TO 19V
4.7μF
x2
10k
EN
MIC24051
VDD
PVDD
BST
SGND
PG
SW
CS
VIN
PVIN
PGND
FB
EN
0.1μF
2.2μH
0.1μF
19.6k
4.7nF
2.49k
2.00k
V_OUT
1.8V/6A
100μF
 2016 Microchip Technology Inc.
DS20005658A-page 1