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參數(shù)資料
| 型號： | MIC2179-5.0YSMTR |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | LEAD FREE, MO-150, SSOP-20 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 353K |
| 代理商： | MIC2179-5.0YSMTR |
June 2009
1
M9999-063009
Micrel, Inc.
MIC2179
MIC2179
1.5A Synchronous Buck Regulator
General Description
The Micrel MIC2179 is a 200kHz synchronous buck (step-
down) switching regulator designed for high-efficiency, bat-
tery-powered applications.
TheMIC2179operatesfroma4.5Vto16.5Vinputandfeatures
internal power MOSFETs that can supply up to 1.5A output
current. It can operate with a maximum duty cycle of 100%
for use in low-dropout conditions. It also features a shutdown
mode that reduces quiescent current to less than 5A.
The MIC2179 achieves high efficiency over a wide output
current range by operating in either PWM or skip mode. The
operating mode is externally selected, typically by an intel-
ligentsystem,whichchoosestheappropriatemodeaccording
to operating conditions, efficiency, and noise requirements.
The switching frequency is preset to 200kHz and can be
synchronized to an external clock signal of up to 300kHz.
The MIC2179 uses current-mode control with internal current
sensing. Current-mode control provides superior line regula-
tionandmakestheregulatorcontrolloopeasytocompensate.
The output is protected with pulse-by-pulse current limiting
and thermal shutdown. Undervoltage lockout turns the output
off when the input voltage is less than 4.5V.
The MIC2179 and is packaged in a 20-lead SSOP package
with an operating temperature range of –40°C to +85°C.
Typical Application
BIAS
SGND
COMP
PGND
FB
SW
VIN
C2
100F
6.3V
VOUT
3.3V/600mA
L1
22H
C4
6.8nF
C3
0.01F
MIC
2179-3.3
PWM
Skip Mode
PWM Mode
SYNC
EN
VIN
5.4V to 16.5V
C1
10F
20V
U1
15
5
13
8
9–12
14
7
1,2,
19,20
3,4
16,17
D1
MBRM120
PWRGD
6
R1
20k
Output Good
Output Low
Pins 4 and 18 are not connected.
Pins 3 and 4 can be connected
together for a low-impedance
connection.
R5
4.02k
Features
4.5V to 16.5V input voltage range
Dual-mode operation for high efficiency (up to 96%)
PWM mode for > 150mA load current
Skip mode for <150mA load current
150mΩ internal power MOSFETs at 12V input
200kHz preset switching frequency
Low quiescent current
1.0mA in PWM mode
600A in skip mode
< 5A in shutdown mode
Current-mode control
Simplified loop compensation
Superior line regulation
100% duty cycle for low dropout operation
Current limit
Thermal shutdown
Undervoltage lockout
Applications
High-efficiency, battery-powered supplies
Buck (step-down) dc-to-dc converters
Cellular telephones
Laptop computers
Hand-held instruments
Battery Charger
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2179BSM | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A 200kHz Synchronous Switcher in SSOP Pkg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2179BSM TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A 200kHz Synchronous Switcher in SSOP Pkg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2179SYM | 制造商:RF Micro Devices Inc 功能描述: |
| MIC2179YSM | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A 200kHz Synchronous Switcher in SSOP Pkg (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2179YSM TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A 200kHz Synchronous Switcher in SSOP Pkg (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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