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参数资料
| 型号： | LTC3544BEUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ QUAD 16QFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 4 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 100mA，200mA（2），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： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3544B
Quad Synchronous
Step-Down Regulator: 2.25MHz,
300mA, 200mA, 200mA, 100mA
High Efficiency: Up to 95%
Four Independent Regulators Provide Up to 300mA,
2.25V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diodes Required
Low Dropout Operation: 100% Duty Cycle
Pulse Skipping at Low Load for Minimum Ripple
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws <1μA Supply Current
Current Mode Operation for Excellent Line and Load
Overtemperature Protected
Low Profile (3mm × 3mm) 16-Lead QFN Package
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments
FEATURES
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200mA, 200mA and 100mA Output Current
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■
■
Transient Response
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APPLICATIONS
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TYPICAL APPLICATION
DESCRIPTION
The LTC ? 3544B is a quad, high efficiency, monolithic
synchronous buck regulator using a constant frequency,
current mode architecture. The four regulators operate in-
dependently with separate run pins. The 2.25V to 5.5V input
voltage range makes the LTC3544B well suited for single
Li-Ion/polymer battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
runtime in portable systems. At moderate and low output
load levels PWM pulse skip mode operation provides very
low output ripple voltage for noise sensitive applications.
Switching frequency is internally set to 2.25MHz, al-
lowing the use of small surface mount inductors and
capacitors.
The internal synchronous switches increase efficiency
and eliminate the need for external Schottky diodes. Low
output voltages are easily supported with the 0.8V feedback
reference voltage.
The LTC3544B is available in a low profile (0.75mm)
(3mm × 3mm) QFN package.
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks 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, 5994885.
V CC
PV IN
4.7μH
40
V IN
2.25V TO 5.5V
V OUT2
1.5V
4.7μF
CER
High Efficiency Quad Step-Down Converter
4.7μF
CER
RUN200B RUN200A
SW200B SW200A
93.1k
V FB200B V FB200A
107k
LTC3544B
3.3μH
100k
V OUT3
0.8V
4.7μF
CER
Efficiency vs Load Current, 300mA
Channel, All Other Channels Off
100
V OUT = 1.5V
90 T A = 25°C
80
70
EFFICIENCY
60
50
POWER LOSS
1
0.1
V OUT4
1.8V
4.7μF
CER
3.3μH
133k
107k
RUN300
SW300
V FB300
GNDA
PGND
RUN100
SW100
V FB100
10μH
59k
118k
V OUT1
1.2V
4.7μF
CER
30
20
10
0
0.0001
0.001
V IN = 2.5V
V IN = 3.6V
V IN = 4.3V
0.01 0.1
1
0.01
0.001
3544B TA01a
LOAD CURRENT (A)
3544B TA01b
3544bfb
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3544EUD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3544EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3544EUDPBF | 制造商:Linear Technology 功能描述:2.25MHz Sync Step-Down Converter LTC3544 |
| LTC3544EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
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