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MIC2176-3のメーカーはMicrel Semiconductorです、この部品の機能は「Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control」です。 |
部品番号 | MIC2176-3 |
| |
部品説明 | Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control | ||
メーカ | Micrel Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとMIC2176-3ダウンロード(pdfファイル)リンクがあります。 Total 30 pages
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
Pin Description (Continued)
Pin
Number
9
10
Pin Name
SW
BST
Pin Function
Switch Node and Current-Sense input (Input): High current output driver return. The SW pin connects
directly to the switch node. Due to the high-speed switching on this pin, the SW pin should be routed
away from sensitive nodes. The SW pin also senses the current by monitoring the voltage across the
low-side MOSFET during OFF time. In order to sense the current accurately, connect the low-side
MOSFET drain to the SW pin using a Kelvin connection.
Boost (Output): Bootstrapped voltage to the high-side N-channel internal MOSFET driver. A Schottky
diode is connected between the VDD pin and the BST pin. A boost capacitor of 0.1μF is connected
between the BST pin and the SW pin. Adding a small resistor in series with the BST pin can slow
down the turn-on time of high-side N-Channel MOSFETs.
November 2010
3 M9999-111710-A
3Pages Micrel, Inc.
Typical Characteristics
VIN Operating Supply Current
vs. Input Voltage
30
25
20
15
10
5
0
0
MIC2176-2
VOUT = 3.3V
IOUT = 0A
VDD = 5V
SWITCHING
10 20 30 40 50 60 70
INPUT VOLTAGE (V)
0.808
0.806
0.804
0.802
0.800
0.798
0.796
0.794
0.792
0
Feedback Voltage
vs. Input Voltage
VOUT = 3.3V
VDD = 5V
IOUT = 0A
10 20 30 40 50 60
INPUT VOLTAGE (V)
70
Switching Frequency
vs. Input Voltage
240
220
200
MIC2176-2
VOUT = 3.3V
IOUT = 0A
VDD = 5V
180
160
0
10 20 30 40 50 60 70
INPUT VOLTAGE (V)
MIC2176
40
35
30
25
20
15
10
5
0
0
VIN Shutdown Current
vs. Input Voltage
VDD = 5V
VEN = 0V
10 20 30 40 50 60 70
INPUT VOLTAGE (V)
1.0%
0.8%
0.6%
Total Regulation
vs. Input Voltage
VOUT = 3.3V
VDD = 5V
IOUT = 0A to 5A
0.4%
0.2%
0.0%
0
10 20 30 40 50 60 70
INPUT VOLTAGE (V)
VDD Operating Supply Current
vs. Input Voltage
10
8
6
MIC2176-2
4 VOUT = 3.3V
IOUT = 0A
2
VDD = 5V
SWITCHING
0
0 10 20 30 40 50 60 70
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
20
15
10
5
VOUT = 1.2V
VDD = 5V
0
0 10 20 30 40 50 60 70
INPUT VOLTAGE (V)
November 2010
6 M9999-111710-A
6 Page | |||
ページ | 合計 : 30 ページ | ||
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PDF ダウンロード | [ MIC2176-3 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
MIC2176-1 | Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control | Micrel Semiconductor |
MIC2176-2 | Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control | Micrel Semiconductor |
MIC2176-3 | Wide Input Voltage Synchronous Buck Controllers Featuring Adaptive On-Time Control | Micrel Semiconductor |