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PDF MIC24051 Data sheet ( Hoja de datos )
| Número de pieza | MIC24051 | |
| Descripción | 6A High-Efficiency Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC24051
12V, 6A High-Efficiency Buck Regulator
SuperSwitcher II
General Description
Features
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 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.
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.
• Hyper Speed Control architecture enables
- 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
• 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
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (VIN = 12V)
vs. Output Current
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
123 4567
OUTPUT CURRENT (A)
8
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
1 page  
Micrel, Inc.
Electrical Characteristics(5) (Continued)
PVIN = VIN = VEN = 12V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min.
Typ.
Enable Control
EN Logic Level High
1.8
EN Logic Level Low
EN Bias Current
Oscillator
Switching Frequency(6)
Maximum Duty Cycle(7)
Minimum Duty Cycle
Minimum Off-Time
VEN = 12V
VOUT = 2.5V
VFB = 0V
VFB = 1.0V
6
450 600
82
0
300
Soft-Start
Soft-Start Time
3
Short-Circuit Protection
Peak Inductor Current-Limit
Threshold
Short-Circuit Current
Internal FETs
VFB = 0.8V, TJ = 25°C
VFB = 0.8V, TJ = 125°C
VFB = 0V
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
ISW = 1A
ISW = 1A
SW Leakage Current
VEN = 0V
VIN Leakage Current
Power Good (PG)
VEN = 0V
PG Threshold Voltage
PG Hysteresis
PG Delay Time
Sweep VFB from Low to High
Sweep VFB from High to Low
Sweep VFB from Low to High
PG Low Voltage
Thermal Protection
Sweep VFB < 0.9 × VNOM, IPG = 1mA
Over-Temperature Shutdown
TJ Rising
Over-Temperature Shutdown
Hysteresis
Notes:
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 300ns.
7.5 11
6.6 11
8
42
12.5
85 92
5.5
100
70
160
15
MIC24051
Max.
Units
V
0.6 V
30 µA
750 kHz
%
%
ns
ms
17
A
17
A
mΩ
mΩ
60 µA
25 µA
95 %VOUT
%VOUT
µs
200 mV
°C
°C
November 2012
5 M9999-112612-A
5 Page 
Micrel, Inc.
Functional Characteristics (Continued)
MIC24051
November 2012
11 M9999-112612-A
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC24051.PDF ] | |
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