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參數(shù)資料
| 型號(hào)： | MIC2179 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 1.5A Synchronous Buck Regulator |
| 中文描述： | 1.5A的同步降壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大小： | 131K |
| 代理商： | MIC2179 |
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June 1998
1
MIC2179
MIC2179
Micrel
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.
The MIC2179 operates from a 4.5V to 16.5V input and
features 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
5
μ
A.
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 intelli-
gent system, which chooses the appropriate mode according
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-
tion and makes the regulator control loop easy to compen-
sate. 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
100μF
6.3V
V
3.3V/600mA
L1
22μH
C4
6.8nF
C3
0.01μF
MIC
2179-3.3
PWM
Skip Mode
PWM Mode
SYNC
EN
R2
10k
V
5.4V to 16.5V
C1
10μF
20V
U1
15
5
13
8
9–12
14
7
1,2,
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.
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
150m
internal power MOSFETs at 12V input
200kHz preset switching frequency
Low quiescent current
1.0mA in PWM mode
600
μ
A in skip mode
< 5
μ
A 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. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2179BSM | 1.5A Synchronous Buck Regulator |
| MIC2182-5.0BM | High-Efficiency Synchronous Buck Controller Final Information |
| MIC2182 | High-Efficiency Synchronous Buck Controller Final Information |
| MIC2182-3.3BM | High-Efficiency Synchronous Buck Controller Final Information |
| MIC2182-3.3BSM | High-Efficiency Synchronous Buck Controller Final Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2179_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.5A Synchronous Buck Regulator |
| MIC2179-3.3BSM | 功能描述:直流/直流開(kāi)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(kāi)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 |
| MIC2179-3.3BSM TR | 功能描述:直流/直流開(kāi)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(kāi)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 |
| MIC2179-3.3YSM | 功能描述:直流/直流開(kāi)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(kāi)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 |
| MIC2179-3.3YSM TR | 功能描述:直流/直流開(kāi)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(kāi)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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