- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44985 > LT3570EUF#PBF (LINEAR TECHNOLOGY CORP) 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 PDF資料下載
參數(shù)資料
| 型號(hào)： | LT3570EUF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 283K |
| 代理商： | LT3570EUF#PBF |
LT3570
9
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LT3574IMS#TRPBF | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3570EUF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A Buck Converter, 1.5A Boost Converter and LDO Controller |
| LT3570FE | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LT3570IFE#TRPBF | 功能描述:IC REG BUCK/BST/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LT3570IFE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A Buck Converter, 1.5A Boost Converter and LDO Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。