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参数资料
| 型号： | LT3570EUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件页数： | 20/20页 |
| 文件大小： | 283K |
| 代理商： | LT3570EUF#TRPBF |
LT3570
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3570fb
OPERATION
The LT3570 is a constant frequency, current mode, buck
converter and boost converter with an NPN LDO regula-
tor. Operation can be best understood by referring to the
Block Diagram.
If all of the SHDN pins are held low, the LT3570 is shut
down and draws zero quiescent current. When any of the
pins exceed 1.4V the internal bias circuits turn on. Each
regulator will only begin regulating when its corresponding
SHDN pin is pulled high.
Each switching regulator controls the output voltage in
a similar manner. The operation of the switchers can be
understood by looking at the boost regulator. A pulse
from the oscillator sets the RS ip-op A4 and turns on
the internal NPN bipolar power switch Q1. Current in Q1
and the external inductor L1 begins to increase. When
this current exceeds a level determined by the voltage at
VC1, comparator A3 resets A4, turning off Q1. The current
in L1 ows through the external Schottky diode D1 and
begins to decrease. The cycle begins again at the next
pulse from the oscillator. In this way, the voltage on the
VC1 pin controls the current through the inductor to the
output. The internal error amplier A1 regulates the output
voltage by continually adjusting the VC1 pin voltage. The
threshold for switching on the VC1 pin is approximately
750mV and an active clamp of 1.15V limits the output
current. The soft-start capacitor C6A allows the part to
slowly start up by ramping the internal reference.
The driver for the buck regulator can operate from either
VIN2 or from the BOOST pin. An external capacitor and
diode are used to generate a voltage at the BOOST pin that
is higher than the input supply. This allows the driver to
saturate the internal bipolar NPN power switch for efcient
operation. The driver for the boost regulator is operated
from VIN1.
The BIAS pin allows the internal circuitry to draw its
current from a lower voltage supply than the input. This
reduces power dissipation and increases efciency. If the
voltage on the BIAS pin falls below 2.5V, then the LT3570
quiescent current will ow from VIN2.
相关PDF资料 |
PDF描述 |
|---|---|
| LT3570EUF#PBF | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 |
| LT3571IUD#PBF | 0.57 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PQCC16 |
| LT3571EUD#PBF | 0.57 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PQCC16 |
| LT3571EUD#TRPBF | 0.57 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PQCC16 |
| LT3574EMS#PBF | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3570FE | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Buck Converter, 1.5A Boost Converter and LDO Controller |
| LT3570IFE#PBF | 功能描述:IC REG BUCK/BST/LINEAR 20TSSOP 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:* |
| LT3570IFE#TRPBF | 功能描述:IC REG BUCK/BST/LINEAR 20TSSOP 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:* |
| LT3570IFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Buck Converter, 1.5A Boost Converter and LDO Controller |
| LT3570IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Buck Converter, 1.5A Boost Converter and LDO Controller |
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