MIC24053 Datasheet, PDF (1/32 Pages) Micrel Semiconductor – 12V, 9A High-Efficiency Buck Regulator

MIC24053
12V, 9A 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
• 9A 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 Startup into a Pre-Biased Load
• –40°C to +125°C Junction Temperature Range
• Available in 28-pin 5 mm x 6 mm QFN Package
Applications
• Servers, Workstations
• Routers, Switches, and Telecom Equipment
• Base Stations
General Description
The MIC24053 is a constant-frequency, synchronous
buck regulator featuring a unique adaptive on-time
control architecture. The MIC24053 operates over an
input supply range of 4.5V to 19V and provides a
regulated output of up to 9A 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.
The 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 MIC24053 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. pin is provided.
Typical Application Circuit
MIC24053
5x6 QFN
2.2μF
10k
PG
V_IN
4.5V to 19V
10k
4.7μF
x2
EN
MIC24053
VDD
PVDD
BST
SGND
PG
SW
CS
VIN
PVIN
PGND
FB
EN
0.1μF
2.2μH
0.1μF
19.6k
2.49k _4.7nF
V_OUT
1.8V/9A
100μFx2
2.00k
 2015 Microchip Technology Inc.
DS20005668A-page 1