参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20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
Error Amp
The LTC3444 error amplifier is a voltage mode amplifier.
The internal loop compensation is designed to optimize
transient response to control input change when the
proper output L-C and R1 values are used. Refer to
Figure 1.
Internal loop compensation is selected by grounding the
V C pin. The loop is designed to exhibit a single pole roll-off
(–20dB/dec) with a crossover frequency of ~100KHz.
External compensation can be used by connecting the
compensation components from FB to V C . The V C pin
must be allowed to float when using external compensa-
tion. If external compensation is used the internal com-
pensation is automatically disabled. A Type III compensa-
Internal Current Limit
There are two different current limit circuits in the LTC3444.
The two circuits have internally fixed thresholds.
The first circuit sources current out of the FB pin to drop
the output voltage once the peak input current exceeds
2.5A minimum. During conditions where V OUT is near
ground, such as during a short circuit or during startup,
this threshold is cut in half, providing current foldback
protection.
The second circuit is a high-speed peak current limit
amplifier that shuts off P-channel MOSFET switch A if the
input current exceeds 3.5A typical. The delay to output for
this amplifier is typically 50ns.
tion network is typically required to meet the output
transient requirements of WCDMA.
During start-up, the ramp rate of the error amp output is
controlled to provide a soft-start function. Refer to
Figure 2.
V OUT
ERROR AMP
20 μ A
+
1.22V
R1
TO PWM
COMPARATORS
V C
–
FB
8
R3
V CONTROL
R2
INTERNAL
COMPENSATION
NETWORK
INT
ON
V IN
0.5 μ A
V OUT
GND = INTERNAL
V C
7
OPEN = EXTERNAL
3444 F01
Figure 1. Error Amplifier with Compensation Select Function
3444fb
8
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相关代理商/技术参数 |
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|---|---|
| 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:* |
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