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| 型号： | MIC2178-5.0YWM |
| 厂商： | Micrel Inc |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V 2.5A 20SOIC |
| 标准包装： | 38 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.5 V ~ 16.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 20-SOIC（宽型） |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-2155 MIC2178-5.0YWM-ND |
MIC2178
General Description
The Micrel MIC2178 is a 200kHz synchronous buck (step-
down) switching regulator designed for high-efficiency, bat-
tery-powered applications.
The MIC2178 operates from a 4.5V to 16.5V input and
features internal power MOSFETs that can supply up to 2.5A
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 MIC2178 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 MIC2178 uses current-mode control with internal current
sensing. Current-mode control provides superior line regula-
Micrel, Inc.
MIC2178
2.5A Synchronous Buck Regulator
Features
? 4.5V to 16.5V input voltage range
? Dual-mode operation for high efficiency (up to 96%)
PWM mode for > 200mA load current
Skip mode for < 200mA load current
? 100m ? 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
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 MIC2178 and is packaged in a 20-lead wide power SOIC
package with an operating temperature range of –40 ° C to
+85 ° C.
See the MIC2177 for automatic selection of PWM or skip-
mode operation.
Typical Application
V IN
5.4V to 18V
?
?
?
?
?
?
?
High-efficiency, battery-powered supplies
Buck (step-down) dc-to-dc converters
Palmtop computers
Laptop computers
Cellular telephones
Hand-held instruments
Battery Chargers
C1
22 μ F
35V
Ouput Good
Output Low
C2
22 μ F
35V
R1
20k
ON
OFF
Skip Mode
PWM Mode
ENABLE
20
11
10
18
U1 1,2,9
VIN
EN MIC2178-5.0 OUT
PWRGD SW
PWM PGND
SYNC FB
10
3,8
4–7
12
L1, 33 μ H
D1
MBRS140
C5
220 μ F
10V
V OUT
5V/2.5A
C6
220 μ F
10V
100
95
90
85
80
5V Output
Efficiency
V IN = 6V
COMP SGND
BIAS
R1
10k
C3
6.8nF
13
14–17
19
C4
0.01 μ F
R2
10k
75
70
10
SKIP
PWM
100 1000 2500
OUTPUT CURRENT (mA)
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
March 2005
1
M9999-031805
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2178BWM | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2178BWM TR | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2178YWM | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2178YWM TR | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2178YWMTR | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
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