參數(shù)資料
型號(hào)： MIC2177
廠商： Micrel Semiconductor,Inc.
英文描述： 2.5A Synchronous Buck Regulator
中文描述： 包2.5a同步降壓穩(wěn)壓器
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 181K
代理商： MIC2177
April 1999
1
MIC2177
MIC2177
Micrel
MIC2177
2.5A Synchronous Buck Regulator
General Description
The Micrel MIC2177 is a 200kHz synchronous buck (step-
down) switching regulator designed for high-efficiency, bat-
tery-powered applications.
The MIC2177 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 MIC2177 achieves high efficiency over a wide output
current range by switching between PWM and skip mode.
Operating mode is automatically selected according to output
conditions. Switching frequency is preset to 200kHz and can
be synchronized to an external clock signal of up to 300kHz.
The MIC2177 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 MIC2177 is packaged in a 20-lead wide power SO
package with an operating temperature range of –40
°
C to
+85
°
C.
See the MIC2178 for externally selected PWM or skip-mode
operation.
Typical Application
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
500
μ
A in skip mode
< 5
μ
A in shutdown mode
100% duty cycle for low dropout operation
Current-mode control
Simplified loop compensation
Superior line regulation
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
BIAS
SGND
EN
COMP
PGND
FB
OUT
VIN
C3
220μF
10V
V
5V/2.5A
L1, 33μH
C5
10nF
C4
0.01μF
MIC2177-5.0
AUTO
SYNC
R7
15k
V
6V to 16.5V
C1
22μF
35V
U1
20
18
11
13
14–17
19
12
4–7
3,8
1,2,9
D1
MBRS140
SW
10
ENABLE
ON
C6
2.2nF
AUTO
PWM
Mode
OFF
C2
22μF
35V
C7
220μF
10V
70
75
80
85
90
95
100
10
100
1000 2500
E
OUTPUT CURRENT (mA)
5V Output
Efficiency
V
IN
= 6V
SKIP
PWM
相關(guān)PDF資料
PDF描述
MIC2177BWM 2.5A Synchronous Buck Regulator
MIC2178-5.0BWM 2.5A Synchronous Buck Regulator
MIC2178-3.3BWM 2.5A Synchronous Buck Regulator
MIC2178BWM 2.5A Synchronous Buck Regulator
MIC2178 2.5A Synchronous Buck Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MIC2177_08 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2.5A Synchronous Buck Regulator
MIC2177-3.3BWM 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5A 200kHz Synchronous Switcher 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
MIC2177-3.3BWM TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5A 200kHz Synchronous Switcher 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
MIC2177-3.3YWM 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5A 200kHz Synchronous Switcher (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
MIC2177-3.3YWM TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5A 200kHz Synchronous Switcher (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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