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| 型号： | LTC3541EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 368K |
| 描述： | IC REG DL BCK/LINEAR SYNC 10-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 2.25MHz |
| 电压/电流 - 输出 1： | 0.8 V ~ 5 V，500mA |
| 电压/电流 - 输出 2： | 0.4 V ~ 4.1 V，300mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 0.9 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC3541
3541fa
High Efficiency
Buck + VLDO Regulator
?/DIV>
PDAs/Palmtop PCs
?/DIV>
Digital Cameras
?/DIV>
Cellular Phones
?/DIV>
PC Cards
?/DIV>
Wireless and DSL Modems
?/DIV>
Other Portable Power Systems
?/DIV>
High Effciency, 500mA Buck Plus 300mA VLDO
TM
Regulator
Auto Start-Up Powers Buck Output Prior to
VLDO/Linear Regulator Output
?/DIV>
Independent High Effciency, 500mA Buck
(V
IN
: 2.7V to 5.5V)
?/DIV>
300mA VLDO Regulator with 30mA Standalone Mode
?/DIV>
No External Schottky Diodes Required
?/DIV>
Buck Output Voltage Range: 0.8V to 5V
?/DIV>
VLDO Input Voltage Range (LV
IN
): 0.9V to 5.5V
?/DIV>
VLDO Output Voltage Range VLDO: 0.4V to 4.1V
?/DIV>
Selectable Fixed Frequency, Pulse-Skip Operation or
Burst Mode
?/DIV>
Operation
?/DIV>
Short-Circuit Protected
?/DIV>
Current Mode Operation for Excellent Line and Load
Transient Response
?/DIV>
Constant Frequency Operation: 2.25MHz
?/DIV>
Low Dropout Buck Operation: 100% Duty Cycle
?/DIV>
Small, Thermally Enhanced, 10-Lead (3mm ?3mm)
DFN Package
PPLICATIO S
EATURES
ESCRIPTIO
YPICAL APPLICATIO
, LT, LTc and LTM are registered trademarks of Linear Technology corporation.
LDO is a trademark of Linear Technology corporation.
ll other trademarks are the property of their respective owners.
r t t . .P t nt in l in 4 117 111 1 4 4 4
2
The LTC
?/DIV>
3541 combines a synchronous buck DC/DC
converter with a very low dropout linear regulator
(VLDO) to provide up to two output voltages from a single
input voltage with minimal external components. When
configured for dual output operation, the LTC3541s auto
start-up feature will bring the Buck output into regulation
in a controlled manner prior to enabling the VLDO regulator
output without the need for external pin control. VLDO/
linear regulator output prior to Buck output sequencing
may also be obtained via external pin control. The input
voltage range is ideally suited for Li-Ion battery-powered
applications, as well as powering sub-3.3V logic from 5V
or 3.3V rails.
The synchronous buck converter provides a high efficiency
output, typically 90%, capable of providing up to 500mA
of continuous output current while switching at 2.25MHz,
allowing the use of small surface mount inductors and ca-
pacitors. A mode-select pin allows Burst Mode operation
to be enabled for higher efficiency at light load currents, or
disabled for lower noise, constant frequency operation.
The VLDO regulator provides a low noise, low voltage
output capable of providing up to 300mA of continuous
output current using only a 2.2礔 ceramic capacitor. The
input supply voltage of the VLDO regulator (LV
IN
) may
come from the buck regulator or a separate supply.
SW
V
IN
ENBUCK
BUCKFB
LV
IN
ENVLDO
MODE
GND
LFB
LV
OUT
PGND
LTC3541
150k
V
OUT2
1.5V
300mA
2.2礔
115k
2.2礖
10礔
V
IN
2.9V TO 5.5V
243k
22pF
412k
OUT1
2.5V
00mA
LTC3541 Typical Application
Buck (Burst) Efficiency and Power Loss vs Load Current
LOAD CURRENT (mA)
1
40
50
60
70
80
10
100
1000
3541 TA01b
30
20
10
0
90
100
0.001
0.01
0.1
0.0001
1
V
IN
= 3.3V
V
OUT
= 2.5V
EFFICIENCY
POWER LOSS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3542 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, 2.25MHz Synchronous Step-Down DC/DC Converter |
| LTC3542-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter |
| LTC3542EDC#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.25MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.25MHZ, 500mA, DFN-6; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:500mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-DFN ;RoHS Compliant: Yes |
| LTC3542EDC#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色产品:BD91x Series Step-Down Regulators 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:2 输出电压:3.3V，0.8 V ~ 2.5 V 输入电压:4.5 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:1MHz 电流 - 输出:1.5A 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-VFQFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:VQFN020V4040 产品目录页面:1373 (CN2011-ZH PDF) 其它名称:BD9152MUV-E2TR |
| LTC3542EDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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