参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV WCDMA 8-DFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，WCDMA 功率放大器应用 |
| 输入电压： | 2.75 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5 V |
| 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 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LTC3444
Micropower Synchronous
Buck-Boost DC/DC Converter
for WCDMA Applications
FEATURES
DESCRIPTIO
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Optimized Features for WCDMA Handsets
Regulated Output with Input Voltages
Above, Below, or Equal to the Output
0.5V to 5V Output Range
Up to 400mA Continuous Output Current From
a Single Lithium-Ion Cell
Minimal External Components
1.5MHz Fixed Frequency Operation
Internal Loop Compensation for Fast Response
<25 μ s Full Scale Output Slewing; C OUT 4.7 μ F
Output Disconnect in Shutdown
2.75V to 5.5V Input
<1 μ A Shutdown Current
Internal Soft-Start
Output Overvoltage Protection
Single Inductor, No Schottky Diodes Required
Small, Thermally Enhanced 8-Lead (3mm × 3mm)
DFN Package
The LTC ? 3444 is a highly efficient, fixed frequency, buck-
boost DC/DC converter, which operates from input volt-
ages above, below, and equal to the output voltage. The
topology incorporated in the IC provides a continuous
transfer function through all operating modes, making the
product ideal for a single Lithium-Ion or multi-cell
applications where the output voltage can vary over a wide
range.
The LTC3444 has been optimized for use in 3G WCDMA
applications. A unique design yields high efficiency at
very low output voltages while also eliminating external
components. The high speed error amplifier provides the
fast transient response required to slew the RF power
amplifier from standby to transmit and transmit to stand
by power levels. Output overvoltage protection protects
the RF power amplifier.
Operating frequency is internally set to 1.5MHz to mini-
mize external component size while maximizing efficiency.
APPLICATIO S
■ WCDMA Applications–3G Handsets with High Speed
Data Rate Capability
■ MP3 Players
Other features include <1 μ A shutdown current, internal
soft-start, peak current limit and thermal shutdown. The
LTC3444 is available in a small, thermally enhanced
8-lead (3mm × 3mm) DFN package.
■
Digital Cameras
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6404251, 6166527.
TYPICAL APPLICATIO
SW1
2.2 μ H
LTC3444
SW2
340k
V OUT
0.8V TO 4.2V
LTC3444 Dynamic Response
3.1V TO 4.2V
V IN
V OUT
4.7 μ F
+
Li-Ion
4.7 μ F
SHDN
GND
FB
V C
205k
V OUT
V CONTROL
V CONTROL
267k
10 μ s/DIV
V IN = 3.6V, V OUT = 0.8V TO 4.2V
V CONTROL = 2.36V TO 0.28V, I LOAD = 100mA
DAC
3444 G16a
3444 TA01
3444fb
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3445 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN |
| LTC3445EUF | 制造商:Linear Technology 功能描述:Conv DC-DC Triple Step Down 2.5V to 5.5V 24-Pin QFN EP |
| LTC3445EUF#PBF | 功能描述:IC REG TRPL BUCK/LINEAR 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3445EUF#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Triple Step Down 2.5V to 5.5V 24-Pin QFN EP T/R |
| LTC3445EUF#TRPBF | 功能描述:IC REG TRPL BUCK/LINEAR 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
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