MIC24052 Datasheet, PDF (1/34 Pages) Micrel Semiconductor – 12V, 6A High-Efficiency Buck Regulator

MIC24052
12V, 6A High-Efficiency Buck Regulator
with HyperLight Load^®
Features
• HyperLight Load^® Efficiency: up to 80% at 10 mA
• Hyper Speed Control^® Architecture Enables:
- High Delta V Operation (V_IN = 19V and V_OUT
= 0.8V)
- Small Output Capacitance
• 4.5V to 19V Input Voltage Range
• 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
• 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 MIC24052 is a constant-frequency, synchronous
DC/DC buck regulator featuring a unique adaptive
on-time control architecture. The MIC24052 operates
over an input supply range of 4.5V to 19V. It has an
internal linear regulator which provides a regulated 5V
to power the internal control circuitry. The MIC24052
operates at a constant 600 kHz switching frequency in
continuous-conduction mode and can be used to
provide up to 6A of output current. The output voltage
is adjustable down to 0.8V.
Microchip’s HyperLight Load^® architecture provides
the same high-efficiency and ultra-fast transient
response as the Hyper Speed Control^® architecture
under medium to heavy loads, but also maintains high
efficiency under light load conditions by transitioning to
variable-frequency, discontinuous-mode operation.
The MIC24052 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, thermal
shutdown, internal soft-start to reduce the inrush
current, foldback current limit and “hiccup mode”
short-circuit protection. The MIC24052 includes a
power good (PG) output to allow simple sequencing.
The 6A Hyper Speed Control part, MIC24051, is also
available on Microchip’s web site.
Typical Application Schematic
MIC24052
28-PIN QFN
2.2μF
10k
PG
V_IN
4.5V TO 19V
4.7μF
x2
10k
EN
MIC24052
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.
DS20005659A-page 1