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参数资料
| 型号： | LTC3549EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.25A 6DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.61 V ~ 5.5 V |
| 输入电压： | 1.6 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 250mA |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
| 其它名称： | LTC3549EDCB#TRMPBFDKR |
LTC3549
250mA Low V IN Buck
Regulator in 2mm × 3mm DFN
FEATURES
DESCRIPTIO
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1.6V to 5.5V Input Voltage Range
Internal Soft-Start
Low Ripple Burst Mode ? Operation
Output Ripple: <20mV P-P
I Q : 50μA
2.25MHz Constant-Frequency Operation
High Ef?ciency: Up to 93%
250mA Output Current (V IN = 1.8V, V OUT = 1.2V)
450mA Peak Inductor Current
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.611V Reference Voltage
Stable with Ceramic Capacitors
Shutdown Mode Draws <1μA Supply Current
Current Mode Operation for Excellent Line and Load
Transient Response
Overtemperature Protection
Available in a Low Pro?le (0.75mm) 6-Lead
(2mm x 3mm) DFN Package
The LTC ? 3549 is a high ef?ciency, monolithic synchronous
buck regulator using a constant-frequency, current mode
architecture. The output voltage is adjusted via an external
resistor divider.
A ?xed switching frequency of 2.25MHz is supported.
This switching frequency allows the use of small surface
mount inductors and capacitors, including ceramics.
Supply current during Burst Mode operation is only 50μA
dropping to < 1μA in shutdown. The 1.6V to 5.5V input
voltage range makes the LTC3549 ideally suited for single
cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH
battery-powered applications. 100% duty cycle capabil-
ity provides low dropout operation, extending battery
life in portable systems. Burst Mode operation can be
user-enabled, increasing ef?ciency at light loads, further
extending battery life.
The internal synchronous switch increases ef?ciency and
eliminates the need for an external Schottky diode. Internal
soft-start offers controlled output voltage rise time at start-
APPLICATIO S
up without the need for external components.
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2 AA-Cell Applications
Cellular Phones
Digital Cameras
MP3 Players
, 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 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATIO
100
Burst Mode Ef?ciency, V OUT = 1.5V
1
High Ef?ciency Step-Down Converter
90
V IN
1.8V TO
5.5V
4.7 μ F
CER
LTC3549
SW
V IN
RUN
3.3 μ H*
22pF
V OUT
1.5V
4.7 μ F
CER
80
70
60
50
0.1
0.01
MODE
*TDK VLF3012AT-3R3MR87
V FB
GND
137k 200k
3549 TA01
40
30
20
10
0
V IN = 1.8V
V IN = 2.5V
V IN = 3.1V
POWER LOST
AT V IN = 2.5V
0.001
0.0001
0.1
1
10 100 1k
LOAD CURRENT (mA)
3549 TA02
3549f
1
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| LTC3550EDHC#PBF | 功能描述:IC CHARGER BATT DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC3550EDHC#TRPBF | 功能描述:IC CHARGER BATT DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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