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MIC24051YJL TR 数据手册 - Micrel（迈瑞）
制造商:
Micrel（迈瑞）
分类:
DC/DC转换器
封装:
QFN-28
描述:
MICREL SEMICONDUCTOR MIC24051YJL TR 直流-直流开关降压(逐步递减)稳压器, 可调, 4.5V-19V输入, 800mV-5.5V输出, 6A输出, QFN-28
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MIC24051YJL TR数据手册
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MIC24051
12V, 6A High-Efficiency Buck Regulator
SuperSwitcher II
HyperLight Load is a registered trademark of Micrel, Inc.
Hyper Speed Control, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November
2012
M9999-112612-A
General Description
The Micrel 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 600kHz.
Micrel’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 Micrel’s web site.
All support documentation can be found on Micrel’s web
site at: www.micrel.com
.
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
• 600kHz 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 28-pin 5mm × 6mm QFN package
Applications
• Servers and work stations
• Routers, switches, and telecom equipment
• Base stations
_________________________________________________________________________________________________________________________
Typical Application
Efficiency (VIN = 12V)
vs. Output Current
50
55
60
65
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8
OUTPUT CURRENT (A)
EFFICIENCY (%)
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
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