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PDF MIC26903 Data sheet ( Hoja de datos )
| Número de pieza | MIC26903 | |
| Descripción | Synchronous DC-to-DC Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
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Hay una vista previa y un enlace de descarga de MIC26903 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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MIC26903
28V, 9A Hyper Light Load™
Synchronous DC/DC Buck Regulator
SuperSwitcher IIG™
General Description
Features
The Micrel MIC26903 is a constant-frequency,
synchronous DC/DC buck regulator featuring adaptive on-
time control architecture. The MIC26903 operates over a
supply range of 4.5V to 28V. It has an internal linear
regulator which provides a regulated 5V to power the
internal control circuitry. MIC26903 operates at a constant
600kHz switching frequency in continuous conduction
mode and can be used to provide up to 9A of output
current. The output voltage is adjustable down to 0.8V.
Micrel’s Hyper Light 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 MIC26903 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
MIC26903 includes a Power Good (PG) output to allow
simple sequencing.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
• Hyper Light Load™ efficiency – up to 80% at 10mA
• Hyper Speed Control™ architecture enables
− High delta V operation (VIN = 28V and VOUT = 0.8V)
− Small output capacitance
• Input voltage range: 4.5V to 28V
• Output current up to 9A
• Up to 95% efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% FB accuracy
• Any CapacitorTM 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
• 5mm × 6mm MLF® package
• –40°C to +125°C junction temperature range
Applications
• Distributed power systems
• Telecom/networking infrastructure
• Printers, scanners, graphic cards and video cards
___________________________________________________________________________________________________________
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
VIN = 12V
3 69
OUTPUT CURRENT (A)
12
Hyper Speed Control, Hyper Light Load, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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
July 2011
M9999-071311-A
1 page  
Micrel, Inc.
MIC26903
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.
Max.
Units
Soft-Start
Soft-Start time
5 ms
Short-Circuit Protection
Current-Limit Threshold
Current-Limit Threshold
Short-Circuit Current
Internal FETs
Top-MOSFET RDS (ON)
Bottom-MOSFET RDS (ON)
SW Leakage Current
VIN Leakage Current
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
VFB = 0.8V, TJ = 25°C
VFB = 0.8V, TJ = 125°C
VFB = 0V
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
TJ Rising
12.5
11.25
85
15 20
15 20
4
A
A
A
27
10.5
60
25
mΩ
mΩ
µA
µA
92 95 %VOUT
5.5 %VOUT
100 µs
70 200 mV
160 °C
15 °C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
3. The device is not guaranteed to function outside operating range.
4. PD(MAX) = (TJ(MAX) – TA)/ θJA, where θJA depends upon the printed circuit layout. A 5 square inch 4 layer, 0.62”, FR-4 PCB with 2oz finish copper weight
per layer is used for the θJA.
5. Specification for packaged product only.
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 300ns.
July 2011
5 M9999-071311-A
5 Page 
Micrel, Inc.
Functional Characteristics
MIC26903
July 2011
11 M9999-071311-A
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC26903.PDF ] | |
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