LT3570
1
3570fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.5A Buck Converter,
1.5A Boost Converter and
LDO Controller
The LT
?/DIV>
3570 is a buck and boost converter with internal
power switches and LDO controller. Each converter is
designed with a 1.5A current limit and an input range from
2.5V to 36V, making the LT3570 ideal for a wide variety
of applications. Switching frequencies up to 2.1MHz are
programmed with an external timing resistor and the
oscillator can be synchronized to an external clock up to
2.75MHz.
The LT3570 features a programmable soft-start function
that limits the feedback voltage during start-up helping
prevent overshoot and limiting inrush current. The LDO
controller is capable of delivering up to 10mA of base
current to an external NPN transistor.
Ef ciency
n
 2.5V to 36V Input Voltage Range
n
 Programmable Switching Frequency 
  from 500kHz to 2.1MHz
n
 Synchronizable Up to 2.75MHz
n
 V
OUT(MIN)
: 0.8V
n
 Independent Soft-Start for Each Converter
n
 Separate V
IN
 Supplies for Each Converter
n
 Duty Cycle Range: 0% to 90% at 1MHz
n
 Available in 24-Lead (4mm ?4mm) QFN and
  20-Lead TSSOP Packages
n
 Cable and Satellite Set-Top Boxes
n
 Automotive Systems
n
 Telecom Systems
n
 Dying Gasp Systems
n
 TFT LCD Displays
V
IN1
SHDN1
SHDN2
SHDN3
SHDN1
SHDN2
SHDN3
SW1
FB1
100nF
1nF
10nF
22糉
2.2糉
V
OUT3
2.5V
100mA
32.4k
V
OUT2
3.3V
1A
22k
143k
V
OUT1
12V
275mA
V
IN
5V
22k
10.0k
10.2k
22.1k
10.2k
3570 TA01a
15.8k
10糉
10糉
1nF
10nF
3.3糎
6.8糎
D2
D3
D1
BOOST
SW2
FB2
SS2
NPN_DRV
FB3
V
C2
SS1
V
C1
V
IN2
V
IN3
BIAS
R
T
SYNC
LT3570
GND
Q1
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
I
OUT2
 (A)
0
70
75
80
85
90
95
100
0.2   0.4   0.6   0.8
3570 TA01b
1.0
f
SW
 = 1.2MHz
V
IN
 = 5V
V
OUT1
 = 12V
V
OUT2
 = 3.3V
V
OUT3
 = 2.5V
I
OUT1
 = 275mA
I
OUT3
 = 100mA
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相关代理商/技术参数
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
LT3570IUF#PBF 功能描述:IC REG TRPL BCK/BST/LINEAR 24QFN 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:*
LT3570IUF#TRPBF 功能描述:IC REG TRPL BCK/BST/LINEAR 24QFN 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:*
LT3570IUF-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
LT3570IUF-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
LT3571EUD#PBF 功能描述:IC REG BOOST ADJ 0.47A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
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