参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20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
OPERATIO
The LTC3444 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 single Lithium-Ion or multi-cell applica-
tions where the output voltage can vary over a wide range.
The LTC3444 is designed to provide dynamic voltage
control in space constrained 3G WCDMA applications.
Due to the high operating frequency and integrated loop
compensation a complete WCDMA application requires
only six additional components; input and output capaci-
tors (ceramic), an inductor, and three resistors. The high
speed error amplifier and integrated loop compensation
provide the fast transient response required to slew the RF
power amplifier’s voltage rail from standby to transmit
and transmit to standby levels in < 25 μ s while minimizing
output overshoot or undershoot.
Efficiency under low output voltage conditions
(standby mode) is improved by using an N-channel
MOSFET in parallel to P-channel MOSFET switch D.
This parallel MOSFET eliminates the need for an external
Schottky. Output overvoltage protection protects the RF
power amplifier from voltages greater than 5.5V.
When used with the proper inductance and output capaci-
tance, the LTC3444 internal compensation is designed to
be consistent with the transient requirements of a typical
WCDMA application. External compensation can be used
with other combinations of inductance and output capaci-
tance, however, the transient response may not be
consistent with typical WCDMA requirements.
Output voltage programming is accomplished via a sum-
ming resistor input to the feedback resistive divider string.
The output voltage varies inversely with the command
voltage. When using the internal loop compensation,
resistor R1 in the feedback resistive divider string must be
340k. There are no constraints on R1 when using external
compensation. However, lower value resistors will de-
crease the resistance value required for programming the
output voltage. Care must be taken not to load down the
control voltage source.
3444fb
7
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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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