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MIC2184YQS-TR

更新时间： 2024-11-12 08:18:47
品牌 Logo 应用领域
美国微芯 - MICROCHIP 开关光电二极管
页数 文件大小 规格书
12页 127K
描述
SWITCHING CONTROLLER, 440kHz SWITCHING FREQ-MAX, PDSO16

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MIC2184YQS-TR 数据手册

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MIC2184  
Micrel, Inc.  
MIC2184  
Low Voltage Buck PWM Control IC  
General Description  
Features  
Micrel’s MIC2184 is a high efficiency PWM buck control IC.  
With its wide input voltage range of 2.9V to 14V, the MIC2184  
can be used to efficiently step voltages down in 1- or 2-cell Li  
Ion battery powered applications, as well as in fixed 3.3V, 5V,  
or 12V systems.  
• Input voltage range: 2.9V to 14V  
• >90% efficiency  
• Oscillator frequency of 400kHz  
• Frequency divide-by-two pin  
• Frequency sync to 600kHz  
• FrequOut oscillator output allows simple charge pump  
implementation in low voltage systems  
• 1.245V reference output  
Efficiencies over 90% are achievable over a wide range of  
load conditions with the MIC2184’s PWM control scheme.  
The operating frequency can be divided by two by raising the  
• Front edge blanking  
FREQ/2pintoV . Thisallowstheusertooptimizeefficiency  
DD  
• 5Ω output driver  
versus board space. It also allows the MIC2184 to be exter-  
• Soft start  
nally synchronized to frequencies below its nominal 400KHz.  
• PWM current mode control  
• 1µA shutdown current  
The MIC2184 features an oscillator output, FreqOut, which  
can be used to implement a simple charge pump in low  
voltage applications. The output of the charge pump can be  
• Cycle-by-cycle current limiting  
• Frequency foldback short circuit protection  
• Adjustable under-voltage lockout  
• 16 pin narrow-body SOIC and QSOP package options  
fed into the gate drive power circuitry via the V P pin,  
IN  
allowing enhanced gate drive, hence higher efficiencies,  
despite low input voltages.  
Applications  
MIC2184 features a 1µA shutdown mode, and a program-  
mableundervoltagelockout, makingitwellsuitedforportable  
applications.  
• 3.3V to 2.5V/1.8V/1.5V conversion  
• DC power distribution systems  
• Wireless Modems  
The MIC2184 is available in 16 pin SOP and QSOP package  
options with a junction temperture range range from –40°C  
to +125°C.  
• ADSL line cards  
• 1-and 2-cell Li Ion battery operated equipment  
• Satellite Phones  
Typical Application  
VIN = 3.3V  
16  
15mΩ  
120µF (x2)  
MIC2184 EFFICIENCY  
VINP  
6.3V  
100  
1
9
VINA  
CSH  
CSL  
95  
90  
85  
7
2
8
EN/UVLO  
FreqOut  
FREQ/2  
VDD  
14  
OUTP  
Q3  
80  
75  
70  
65  
60  
55  
50  
VOUT  
Si9803DY(x2)  
16  
10  
4
2.5V @5A  
MIC2184  
4.7µH  
V
V
f
= 3.3V  
IN  
OUT  
S
= 2.5V  
= 200kHz  
COMP  
3
12  
6
220µF(x2)  
6.3V  
SS  
PGND  
FB  
13  
VREF  
0
1
2
3
4
5
OUTPUT CURRENT (A)  
SYNC SGND  
11  
5
Adjustable Output Buck Converter  
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-042205  
April 2005  
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