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PDF MIC24052 Data sheet ( Hoja de datos )
| Número de pieza | MIC24052 | |
| Descripción | 6A High-Efficiency Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC24052
12V, 6A High-Efficiency Buck Regulator
SuperSwitcher II
General Description
Features
The Micrel MIC24052 is a constant-frequency,
synchronous DC/DC buck regulator featuring adaptive on-
time control architecture. The MIC24052 operates over a
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 600kHz 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.
Micrel’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 Micrel’s web site.
• HyperLight Load efficiency – up to 80% at 10mA
• Hyper Speed Control architecture enables
− High delta V operation (VIN = 19V and VOUT = 0.8V)
− Small output capacitance
• Input voltage range: 4.5V to 19V
• Output current up to 6A
• Up to 95% efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% FB accuracy
• Any Capacitor™ stable − zero-to-high ESR
• 600kHz switching frequency
• Power good (PG) output
• Foldback current-limit and “hiccup mode” short-circuit
protection
• Safe start-up into pre-biased loads
• –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
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
___________________________________________________________________________________________________________
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
1234567
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
December 2012
M9999-120312-A
1 page  
Micrel, Inc.
MIC24052
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
VEN = 12V
6
Oscillator
Switching Frequency (6)
Maximum Duty Cycle (7)
VOUT = 2.5V
VFB = 0V
450 600
82
Minimum Duty Cycle
VFB = 1.0V
0
Minimum Off-Time
300
Soft-Start
Soft-Start time
Short-Circuit Protection
Peak Inductor Current-Limit
Threshold
Peak Inductor Current-Limit
Threshold
Short-Circuit Current
Internal FETs
VFB = 0.8V, TJ = 25°C
VFB = 0.8V, TJ = 125°C
VFB = 0V
3
7.5 11
6.6 11
8
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
SW Leakage Current
VIN Leakage Current
Power Good (PG)
Power Good Threshold Voltage
Power Good Hysteresis
Power Good Delay Time
Power Good Low Voltage
Thermal Protection
ISW = 3A
ISW = 3A
VEN = 0V
VEN = 0V
Sweep VFB from Low to High
Sweep VFB from High to Low
Sweep VFB from Low to High
Sweep VFB < 0.9 × VNOM, IPG = 1mA
42
12.5
85 92
5.5
100
70
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
TJ Rising
160
15
Max. Units
V
0.6 V
30 µA
750 kHz
%
%
ns
ms
17 A
17 A
A
mΩ
mΩ
60 µA
25 µA
95 %VOUT
%VOUT
µs
200 mV
°C
°C
December 2012
5 M9999-120312-A
5 Page 
Micrel, Inc.
Functional Characteristics (Continued)
MIC24052
December 2012
11 M9999-120312-A
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC24052.PDF ] | |
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