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PDF MIC28304 Data sheet ( Hoja de datos )
| Número de pieza | MIC28304 | |
| Descripción | 70V 3A Power Module | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC28304 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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MIC28304
70V 3A Power Module
Hyper Speed Control™ Family
General Description
Micrel’s MIC28304 is synchronous step-down regulator
module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC-to-DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor and an inductor in a single package. The
MIC28304 operates over an input supply range from 4.5V
to 70V and can be used to supply up to 3A of output
current. The output voltage is adjustable down to 0.8V with
a guaranteed accuracy of ±1%. The device operates with
programmable switching frequency from 200kHz to
600kHz.
Micrel’s HyperLight Load™ architecture provides the same
high-efficiency and ultra-fast transient response as the
Hyper Speed Control™ architecture under the medium to
heavy loads, but also maintains high efficiency under light
load conditions by transitioning to variable frequency,
discontinuous-mode operation.
The MIC28304 offers a full suite of protection features.
These include undervoltage lockout, internal soft-start,
foldback current limit, “hiccup” mode short-circuit
protection, and thermal shutdown.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Easy to use
− Stable with low-ESR ceramic output capacitor
− No compensation and no inductor to choose
• 4.5V to 70V input voltage
• Single-supply operation
• Power Good (PG) output
• Low radiated emission (EMI) per EN55022, Class B
• Adjustable current limit
• Adjustable output voltage from 0.9V to 24V
(also limited by duty cycle)
• 200kHz to 600kHz, programmable switching frequency
• Supports safe start-up into a pre-biased output
• –40°C to +125°C junction temperature range
• Available in 64-pin, 12mm × 12mm × 3mm QFN
package
Applications
• Distributed power systems
• Industrial, medical, telecom, and automotive
Typical Application
Hyper Speed Control, HyperLight Load, 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
March 25, 2014
Revision 1.1
1 page  
Micrel, Inc.
MIC28304
Electrical Characteristics(4) (Continued)
PVIN = VIN = 12V, VOUT = 5V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min. Typ. Max.
Enable Control
EN Logic Level High
EN Logic Level Low
1.8
0.6
EN Hysteresis
EN Bias Current
Oscillator
VEN = 12V
200
5 20
Switching Frequency
Maximum Duty Cycle
FREQ pin = open
RFREQ = 100kΩ (FREQ pin-to-GND)
400 600 750
300
85
Minimum Duty Cycle
Minimum Off-Time
Soft-Start(5)
VFB > 0.8V
0
140 200 260
Soft-Start Time
Short-Circuit Protection(5)
5
Current-Limit Threshold (VCL)
Short-Circuit Threshold
Current-Limit Source Current
Short-Circuit Source Current
Leakage
VFB = 0.79V
VFB = 0V
VFB = 0.79V
VFB = 0V
−30 −14
0
−23 −7
9
60 80 100
27 36 47
SW, BSTR Leakage Current
Power Good(5)
50
Power Good Threshold Voltage
Power Good Hysteresis
Power Good Delay Time
Power Good Low Voltage
Thermal Protection
Sweep VFB from low-to-high
Sweep VFB from high-to-low
Sweep VFB from low-to-high
VFB < 90% x VNOM, IPG = 1mA
85 90 95
6
100
70 200
Overtemperature Shutdown
Overtemperature Shutdown Hysteresis
TJ Rising
160
4
Units
V
V
mV
µA
kHz
%
%
ns
ms
mV
mV
µA
µA
µA
%VOUT
%VOUT
µs
mV
°C
°C
March 25, 2014
5
Revision 1.1
5 Page 
Micrel, Inc.
Typical Characteristics (Continued)
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
PVDD Voltage
vs. Temperature
IPVDD = 10mA
IPVDD = 40mA
VIN = 12V
IOUT = 0A
FSW = 600kHz
-25 0 25 50 75 100 125
TEMPERATURE (°C)
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
-50
PVDD UVLO Threshold
vs. Temperature
RISING
FALLING
VIN = 12V
IOUT = 0A
FSW = 600kHz
-25 0 25 50 75
TEMPERATURE (°C)
100 125
EN Bias Current
vs. Temperature
100
VIN = 12V
80 VEN = 0V
FSW = 600kHz
60
40
20
0
-50
-25 0 25 50 75
TEMPERATURE (°C)
100 125
Enable Threshold
vs. Temperature
1.5
VIN = 12V
1.4
1.3
RISING
VOUT = 5V
FSW = 600kHz
1.2
1.1
1.0 FALLING
0.9
0.8
0.7
0.6
0.5
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
Feedback Voltage
vs. Temperature (MIC28304-2)
0.812
0.808
0.804
0.800
0.796
0.792
-50 -25
VIN = 12V
VOUT = 5.0V
IOUT = 0A
FSW = 600kHz
0 25 50 75 100 125
TEMPERATURE (°C)
0.4%
0.3%
0.2%
Load Regulation
vs. Temperature (MIC28304-2)
VIN = 12V
VOUT = 5.0V
IOUT = 0A TO 3A
FSW = 600kHz
0.1%
0.0%
-0.1%
-0.2%
-0.3%
-50
-25 0 25 50 75
TEMPERATURE (°C)
100 125
MIC28304
Output Peak Current Limit
vs. Temperature
10
8
6
4
VIN = 12V
2
VOUT = 5.0V
FSW = 600kHz
0
-50
-25 0 25 50 75
TEMPERATURE (°C)
100 125
VIN Operating Supply Current
vs. Temperature (MIC28304-2)
40
36
32
28
24
20
16 VIN = 12V
12 VOUT = 5.0V
IOUT = 0A
8 FSW = 600kHz
4
0
-50 -25
0
25 50 75 100 125
TEMPERATURE (°C)
1.00%
0.50%
Line Regulation
vs. Temperature (MIC28304-2)
VIN = 7V TO 70V
VOUT = 5.0V
IOUT = 0A
FSW = 600kHz
0.00%
-0.50%
-1.00%
-50
-25 0 25 50 75 100 125
TEMPERATURE (°C)
March 25, 2014
11
Revision 1.1
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC28304.PDF ] | |
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