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参数资料
| 型号： | LTC3549EDCB#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 1/16页 |
| 文件大小： | 352K |
| 代理商： | LTC3549EDCB#TR |
LTC3549
1
3549f
LOAD CURRENT (mA)
30
EFFICIENCY
(%)
90
100
20
10
80
50
70
60
40
0.1
10
100
1k
3549 TA02
0
1
0.1
0.01
0.001
0.0001
1
VIN = 1.8V
VIN = 2.5V
VIN = 3.1V
POWER LOST
AT VIN = 2.5V
POWER
LOSS
(W)
250mA Low VIN Buck
Regulator in 2mm × 3mm DFN
The LTC3549 is a high efciency, 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 50A
dropping to < 1A 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 efciency at light loads, further
extending battery life.
The internal synchronous switch increases efciency and
eliminates the need for an external Schottky diode. Internal
soft-start offers controlled output voltage rise time at start-
up without the need for external components.
■
2 AA-Cell Applications
■
Cellular Phones
■
Digital Cameras
■
MP3 Players
■
1.6V to 5.5V Input Voltage Range
■
Internal Soft-Start
■
Low Ripple Burst Mode Operation
Output Ripple: <20mVP-P
IQ: 50A
■
2.25MHz Constant-Frequency Operation
■
High Efciency: Up to 93%
■
250mA Output Current (VIN = 1.8V, VOUT = 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 <1A Supply Current
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Overtemperature Protection
■
Available in a Low Prole (0.75mm) 6-Lead
(2mm x 3mm) DFN Package
High Efciency Step-Down Converter
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, 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.
VIN
RUN
MODE
VFB
SW
GND
LTC3549
3.3
H*
VOUT
1.5V
200k
4.7
F
CER
*TDK VLF3012AT-3R3MR87
VIN
1.8V TO
5.5V
137k
3549 TA01
22pF
4.7
F
CER
Burst Mode Efciency, VOUT = 1.5V
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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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