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参数资料
| 型号： | LTC3547EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ .3A DL 8DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 300mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3547
Dual Monolithic
300mA Synchronous
Step-Down Regulator
FEATURES
DESCRIPTIO
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High Ef?ciency Dual Step-Down Outputs: Up to 96%
300mA Output Current per Channel at V IN = 3V
Automatic Low Ripple Burst Mode Operation
(20mV P-P )
Only 40μA Quiescent Current During Operation
(Both Channels)
2.25MHz Constant-Frequency Operation
2.5V to 5.5V Input Voltage Range
Low Dropout Operation: 100% Duty Cycle
Internally Compensated for All Ceramic Capacitors
Independent Internal Soft-Start for Each Channel
Current Mode Operation for Excellent Line and Load
Transient Response
0.6V Reference Allows Low Output Voltages
Short-Circuit Protected
Ultralow Shutdown Current: I Q < 1μA
Low Pro?le (0.75mm) 8-Lead 3mm × 2mm
DFN Package
The LTC ? 3547 is a dual, 2.25MHz, constant-frequency,
synchronous step-down DC/DC converter in a tiny 3mm
× 2mm DFN package. 100% duty cycle provides low drop-
out operation, extending battery life in portable systems.
Low output voltages are supported with the 0.6V feed-
back reference voltage. Each regulator can supply 300mA
continuous output current.
The input voltage range is 2.5V to 5.5V, making it ideal for
Li-Ion and USB powered applications. Supply current dur-
ing operation is only 40μA and drops to < 1μA in shutdown.
Automatic Burst Mode ? operation increases ef?ciency at
light loads, further extending battery life.
An internally set 2.25MHz switching frequency allows
the use of tiny surface mount inductors and capacitors.
Internal soft-start reduces inrush current during start-
up. All outputs are internally compensated to work with
ceramic capacitors. The LTC3547 is available in a low
APPLICATIO S
pro?le (0.75mm) 3mm × 2mm DFN package. The LTC3547
is also available in a ?xed output voltage con?guration,
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Cellular Telephones
Digital Still Cameras
Wireless and DSL Modems
PDAs/Palmtop PCs
Portable Media Players
eliminating the need for the external feedback networks
(see Table 2).
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6580258, 5481178, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATIO
Dual Monolithic Buck Regulator in 8-Lead 3mm × 2mm DFN
100
90
Ef?ciency vs Output Current
for V OUT = 2.5V
1
V IN
2.5V TO 5.5V
4.7 μ F
RUN2 V IN RUN1
80
70
60
0.1
V OUT2
1.8V AT
L2
4.7 μ H
LTC3547
SW2
SW1
L1
4.7 μ H
V OUT1
2.5V AT
50
40
0.01
300mA
4.7 μ F
10pF
475k
237k
V FB2
GND
V FB1
150k
10pF
475k
300mA
4.7 μ F
30
20
10
0
V IN = 2.7V
V IN = 3.6V
V IN = 4.2V
0.001
0.0001
0.1
1
10 100
1000
3547 TA01
OUTPUT CURRENT (mA)
3547 TA01b
3547fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3548 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator |
| LTC3548-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548AEDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
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