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LTC3445EUF#PBF

更新时间： 2024-01-28 16:01:33
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
24页 466K
描述
LTC3445 - I<sup>2</sup>C Controllable Buck Regulator with Two LDOs in a 4mm x 4mm QFN; Package: QFN; Pins: 24; Temperature Range: -40&deg;C to 85&deg;C

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中文翻译

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LTC3445EUF#PBF 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：HVQCCN,
针数：24Reach Compliance Code：compliant
风险等级：5.28模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE最大输入电压：5.5 V
最小输入电压：2.5 V标称输入电压：3.6 V
JESD-30 代码：S-PQCC-N24JESD-609代码：e3
长度：4 mm湿度敏感等级：1
功能数量：1端子数量：24
最高工作温度：70 °C最低工作温度：
最大输出电流：0.8 A封装主体材料：PLASTIC/EPOXY
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：0.8 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：1800 kHz温度等级：COMMERCIAL
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：30宽度：4 mm

LTC3445EUF#PBF 数据手册

 浏览型号LTC3445EUF#PBF的Datasheet PDF文件第2页浏览型号LTC3445EUF#PBF的Datasheet PDF文件第3页浏览型号LTC3445EUF#PBF的Datasheet PDF文件第4页浏览型号LTC3445EUF#PBF的Datasheet PDF文件第5页浏览型号LTC3445EUF#PBF的Datasheet PDF文件第6页浏览型号LTC3445EUF#PBF的Datasheet PDF文件第7页 
LTC3445  
2
I C Controllable  
Buck Regulator with Two LDOs  
in a 4mm × 4mm QFN  
U
FEATURES  
DESCRIPTIO  
Buck Regulator  
The LTC®3445 contains a high efficiency monolithic syn-  
chronous current mode buck regulator, two LDO regula-  
tors, a PowerPathTM controller and an I2CTM interface.  
■
High Efficiency: Up to 93%  
■
600mA Output Current (VCC1 = 3V, VOUT = 1.3V)  
■
Programmable Output Voltage: 0.85V to 1.55V  
Thebuckregulatorhasa6-bitprogrammableoutputrange  
of 0.85V to 1.55V. Also, the buck regulator uses either a  
constant (1.5MHz) or a spread spectrum switching fre-  
quency. Using the spread spectrum option allows for a  
lower noise regulated output as well as low noise at the  
input. In addition, the regulated output voltage slew rate is  
programmable via the I2C interface.  
■
2.5V to 5.5V Input Voltage Range  
1.5MHz Constant Frequency or Spread Spectrum  
Option  
Soft-Start  
■
■
LDOs  
■
Two LDO Regulators: 0.3V Dropout at 50mA  
PowerPath Controller  
The LTC3445 contains two LDO voltage regulators. The  
regulator output voltages are externally resistor program-  
mable. Each LDO is capable of delivering up to 50mA.  
■
Dynamically Regulates VCC BATT  
I2C  
■
Standard (100kHz) or Fast Mode (400kHz)  
24-Lead (4mm × 4mm) QFN Package  
The LTC3445 contains control circuitry (PowerPath) for  
automatic back-up battery selection. VBACKUP is typically  
a coin cell.  
■
U
APPLICATIO S  
Typicalsupplycurrentduringoperationisonly360µAand  
drops to 27µA in shutdown. The 2.5V to 5.5V input  
voltage range makes the LTC3445 ideal for single Li-Ion  
battery-powered applications. Automatic Burst Mode®  
operation increases efficiency at light loads, further ex-  
tending battery life.  
■
Intel’s Microprocessor Supply (PXA27X)  
■
Portable Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
PowerPath is a trademark of Linear Technology Corporation.  
I2C is a trademark of Philips Electronics N.V.  
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,  
6611131, Spread Spectrum patent pending.  
U
TYPICAL APPLICATIO  
V
CC  
Efficiency and Power Loss  
V
BACKUP  
vs Load Current, V  
= 3.6V  
CC1  
4.7µF  
CER  
20k  
V
V
V
CC1  
CC1  
CC2  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
V
V
BATTFAULT  
nBATT_FAULT  
TRACK  
V
BACKUP  
EFFICIENCY  
3V  
COIN  
CELL  
3V  
TYP  
V
BATT  
BACKUP  
CC  
+
4.7µF  
DAC MIN  
DAC MAX  
CER  
2.2µH  
0.85V  
TO 1.55V  
PWR_EN  
RUN  
SDA  
SCL  
SW  
FB  
4.7µF  
CER  
2
DAC MAX  
LTC3445  
I C BUS  
DAC MIN  
1.3V  
1.1V  
LDO1  
V
CC  
10µF  
CER  
705k  
503k  
604k  
604k  
POWER LOSS  
1.0  
V
OR GND  
ADD7  
ADD6  
CC1  
CC1  
LDO1FB  
LDO2  
20k  
V
OR GND  
nV _FAULT  
CC  
PGOOD  
10µF  
CER  
0.1  
1000  
0.1  
1
10  
100  
LDO2FB  
GND  
3445 TA01  
LOAD CURRENT (mA)  
3445 TA01b  
3445fa  
1
1234567...24

中文翻译

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LTC3445EUF#PBF 替代型号

型号 品牌 替代类型 描述 数据表
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