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PDF MIC2176-2 Data sheet ( Hoja de datos )
| Número de pieza | MIC2176-2 | |
| Descripción | Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control | |
| Fabricantes | Micrel Semiconductor | |
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MIC2176-1/-2/-3
Wide Input Voltage, Synchronous Buck
Controllers Featuring Adaptive On-Time
Control
Hyper Speed Control™ Family
General Description
Features
The Micrel MIC2176-1/-2/-3 is a family of constant-frequency,
synchronous buck controllers featuring a unique digitally
modified adaptive ON-time control architecture. The MIC2176
family operates over an input supply range of 4.5V to 75V
and can be used to supply up to 15A of output current. The
output voltage is adjustable down to 0.8V with a guaranteed
accuracy of ±1%, and the device operates at a constant
switching frequency of 100kHz, 200kHz, and 300kHz.
Micrel’s Hyper Speed ControlTM architecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes (High VIN)/(Low VOUT) operation possible.
This digitally modified adaptive tON ripple control architecture
combines the advantages of fixed-frequency operation and
fast transient response in a single device.
The MIC2176 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, fold-back current limit, “hiccup” mode short-
circuit protection and thermal shutdown.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
• Hyper Speed ControlTM architecture enables
- High delta V operation (VIN = 75V and VOUT = 1.2V)
- Small output capacitance
• 4.5V to 75V input voltage
• Output down to 0.8V with ±1% accuracy
• Any CapacitorTM Stable
- Zero-ESR to high-ESR output capacitance
• 100kHz/200kHz/300kHz switching frequency
• Internal compensation
• 6ms Internal soft-start
• Foldback current limit and “hiccup” mode short-circuit
protection
• Thermal shutdown
• Supports safe start-up into a pre-biased output
• –40°C to +125°C junction temperature range
• Available in 10-pin MSOP package
Applications
• Distributed power systems
• Networking/Telecom Infrastructure
• Printers, scanners, graphic cards and video cards
___________________________________________________________________________________________________________
Typical Application
MIC2176-2 Adjustable Output 200KHz Buck Converter
95
90
85
80
75
70
65
60
55
50
45
40
0
Efficiency
vs. Output Current
28VIN
48VIN
60VIN
MIC2176-2
VOUT = 3.3V
VDD = 5V LINEAR
1234
OUTPUT CURRENT (A)
5
Hyper Speed Control, 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
November 2010
M9999-111710-A
1 page  
Micrel, Inc.
MIC2176
Electrical Characteristics(4) (Continued)
VIN = VHSD = 48V, VDD = 5V; VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min.
Typ.
Max.
Soft Start
Soft-Start time
6
Short Circuit Protection
Current-Limit Threshold
Short-Circuit Threshold
FET Drivers
DH, DL Output Low Voltage
VFB = 0.8V
VFB = 0V
ISINK = 10mA
DH, DL Output High Voltage
ISOURCE = 10mA
DH On-Resistance, High State
DH On-Resistance, Low State
DL On-Resistance, High State
DL On-Resistance, Low State
SW Leakage Current
HSD Leakage Current
Thermal Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Hysteresis
VSW = 48V, VDD = 5V, VBST = 53V
VSW = 48V, VDD = 5V, VBST = 53V
TJ Rising
103 130
19 48
VDD - 0.1V
Or
VBST - 0.1V
2.1
1.8
1.8
1.2
160
25
162
77
0.1
3.3
3.3
3.3
2.3
55
55
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. Specification for packaged product only.
5. The application is fully functional at low VDD (supply of the control section) if the external MOSFETs have enough low voltage VTH.
6. Measured in test mode.
7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 360ns.
Units
ms
mV
mV
V
V
Ω
Ω
Ω
Ω
µA
µA
°C
°C
November 2010
5 M9999-111710-A
5 Page 
Micrel, Inc.
Functional Characteristics (Continued)
MIC2176
November 2010
11 M9999-111710-A
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC2176-2.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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