参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20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
Buck Region (V IN > V OUT )
Switch D is always on and switch C is always off during this
mode. When the internal control voltage, V CI , is above
voltage V1, Switch A is on. During the off time of switch A,
synchronous switch B turns on for the remainder of the
time. Switches A and B will alternate similar to a typical
synchronous buck regulator. As the control voltage in-
creases, the duty cycle of switch A increases until the
maximum duty cycle of the converter in buck mode
reaches DMAX_BUCK, given by:
DMAX_BUCK = 100% – D4 SW
Buck-Boost or Four Switch (V IN ~ V OUT )
When the internal control voltage, V CI , is above voltage V2,
but below V3, switch pair AD remain on for duty cycle
DMAX_BUCK, and the switch pair AC begins to phase in.
As switch pair AC phases in, switch pair BD phases out
accordingly. When the V CI voltage reaches the edge of the
buck-boost range, at voltage V3, the AC switch pair
completely phase out the BD pair, and the boost phase
begins at duty cycle D4 SW . The input voltage, V IN , where
the four switch region begins is given by:
where D4 SW = duty cycle % of the four switch range.
D4 SW = (125ns ? f) ? 100 %
V IN =
V OUT
1 – ( 125 ns ? f )
V
where f = operating frequency, Hz.
Beyond this point the “four switch,” or Buck-Boost region
is reached.
The point at which the four switch region ends is given by:
V IN = V OUT (1–D) = V OUT (1–125ns ? f) V
3444fb
11
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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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