|
|
MIC22205のメーカーはMicrel Semiconductorです、この部品の機能は「Synchronous Buck Regulator」です。 |
部品番号 | MIC22205 |
| |
部品説明 | Synchronous Buck Regulator | ||
メーカ | Micrel Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとMIC22205ダウンロード(pdfファイル)リンクがあります。 Total 29 pages
MIC22205
2A, Integrated, Switch, High-Efficiency,
Synchronous Buck Regulator with
Frequency Programmable up to 4MHz
General Description
The Micrel MIC22205 is a high-efficiency, 2A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22205 is optimized for highest efficiency, achieving
more than 95% efficiency while still switching at 1MHz.
The ultra-high speed control loop keeps the output voltage
within regulation even under the extreme transient load
swings commonly found in FPGAs and low-voltage ASICs.
The output voltage is pre-bias safe and can be adjusted
down to 0.7V to address all low-voltage power needs.
The MIC22205 offers a full range of sequencing and
tracking options. The Enable/Delay (EN/DLY) pin,
combined with the Power Good (PG) pin, allows multiple
outputs to be sequenced in any way during turn-on and
turn-off. The Ramp Control™ (RC) pin allows the device to
be connected to another product in the MIC22xxx and/or
MIC68xxx family, to keep the output voltages within a
certain ∆V on start-up.
The MIC22205 is available in a 12-pin 3mm x 3mm MLF®
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range: 2.9V to 5.5V
• Output voltage adjustable down to 0.7V
• Output load current up to 2A
• Safe start-up into a pre-biased output
• Full sequencing and tracking capability
• Power Good (PG) output
• Efficiency > 95% across a broad load range
• Programmable frequency 300kHz to 4MHz
• Ultra-fast transient response
• Easy RC compensation
• 100% maximum duty cycle
• Fully-integrated MOSFET switches
• Thermal-shutdown and current-limit protection
• 12-pin 3mm x 3mm MLF®
• –40°C to +125°C junction temperature range
Applications
• High power density point-of-load conversion
• Servers, routers, and base stations
• DVD recorders / Blu-ray players
• Computing peripherals
• FPGAs, DSP, and low-voltage ASIC power
_________________________________________________________________________________________________________________________
Typical Application
MIC22205 2A 1MHz Synchronous Output Converter
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (VIN = 5V)
vs. Output Current
3.3V
1.8V
VIN = 5V
0.5 1 1.5
OUTPUT CURRENT (A)
2
Ramp Control is a trademark 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
August 2011
M9999-082511-A
1 Page Micrel, Inc.
MIC22205
Pin Description (Continued)
Pin Number
10
11
12
EP
Pin Name
PGND
NC
EN/DLY
GND
Description
Power Ground: Internal ground connection to the source of the internal N-Channel MOSFETs.
No Connect: Leave this pin open. Do not connect to ground or route other signal through this.
Enable/Delay (Input): This pin is internally fed with a 1µA current source from SVIN. A delayed
turn on is implemented by adding a capacitor to this pin. The delay is proportional to the
capacitor value. The internal circuits are held off until EN/DLY reaches the enable threshold of
1.24V. This pin is pulled low when the input voltage is lower than the UVLO threshold.
Exposed Pad (Power): Must be connected to the GND plane for full output power to be realized.
August 2011
3 M9999-082511-A
3Pages Micrel, Inc.
Typical Characteristics
VIN Operating Supply Current
vs. Input Voltage
16
VOUT = 1.8V
14 IOUT = 0A
SWITCHING
12
10
8
6
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Load Regulation
vs. Input Voltage
0.6%
0.4%
VOUT = 1.8V
IOUT = 0A to 2A
0.2%
0.0%
-0.2%
-0.4%
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Switching Frequency
vs. Input Voltage
1100
1050
VOUT = 1.8V
IOUT = 0A
1000
950
900
850
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MIC22205
VIN Shutdown Current
vs. Input Voltage
10
VEN/DLY = 0V
8
6
4
2
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
10
8 VOUT = 1.8V
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Enable Input Current
vs. Input Voltage
1.50
1.25
VEN/DLY = VIN
1.00
0.75
0.50
0.25
0.00
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Feedback Voltage
vs. Input Voltage
0.724
0.716
0.708
VOUT = 1.8V
0.700
0.692
0.684
0.676
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Enable Threshold
vs. Input Voltage
1.50
1.40
Rising
1.30
1.20
Falling
1.10
1.00
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Power Good Threshold/VREF
Ratio vs. Input Voltage
14.0
13.0
12.0
11.0
10.0
9.0
VREF = 0.7V
8.0
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
August 2011
6 M9999-082511-A
6 Page | |||
ページ | 合計 : 29 ページ | ||
|
PDF ダウンロード | [ MIC22205 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 |
MIC22200 | 2A Integrated Switch Synchronous Buck Regulator | Micrel Semiconductor |
MIC22205 | Synchronous Buck Regulator | Micrel Semiconductor |