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LT3508IUF#TR PDF预览

LT3508IUF#TR

更新时间： 2024-02-06 10:43:42
品牌 Logo 应用领域
凌特 - Linear 开关
页数 文件大小 规格书
26页 314K
描述
IC 3.2 A DUAL SWITCHING CONTROLLER, 1060 kHz SWITCHING FREQ-MAX, PQCC24, 4 X 4 MM, PLASTIC, MO-220WGGD-X, QFN-24, Switching Regulator or Controller

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LT3508IUF#TR 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete零件包装代码：QFN
包装说明：4 X 4 MM, PLASTIC, MO-220WGGD-X, QFN-24针数：24
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.12
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：36 V
最小输入电压：3.7 V标称输入电压：12 V
JESD-30 代码：S-PQCC-N24JESD-609代码：e0
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：125 °C最低工作温度：-40 °C
最大输出电流：3.2 A封装主体材料：PLASTIC/EPOXY
封装代码：HVQCCN封装等效代码：LCC24,.16SQ,20
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）：235认证状态：Not Qualified
座面最大高度：0.8 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
最大切换频率：1060 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn/Pb)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：20宽度：4 mm
Base Number Matches：1

LT3508IUF#TR 数据手册

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LT3508  
Dual Monolithic 1.4A  
Step-Down Switching  
Regulator  
FEATURES  
DESCRIPTION  
The LT®3508 is a dual current mode PWM step-down  
DC/DC converter with internal power switches capable of  
generatingtwo1.4Aoutputs. Thewideinputvoltagerange  
of 3.7V to 36V makes the LT3508 suitable for regulating  
power from a wide variety of sources, including automo-  
tivebatteries,24Vindustrialsuppliesandunregulatedwall  
adapters. Bothconvertersaresynchronizedtoasingleos-  
cillatorprogrammableupto2.5MHzandrunwithopposite  
phases, reducing input ripple current. Its high operating  
frequency allows the use of small, low cost inductors and  
ceramic capacitors, resulting in low, predictable output  
ripple. Each regulator has independent tracking and soft-  
start circuits and generates a power good signal when its  
output is in regulation, easing power supply sequencing  
and interfacing with microcontrollers and DSPs.  
n
Wide Input Voltage Range: 3.7V to 36V  
n
Two 1.4A Output Switching Regulators with Internal  
Power Switches  
n
Adjustable 250kHz to 2.5MHz Switching Frequency  
n
Synchronizable over the Full Frequency Range  
n
Anti-Phase Switching Reduces Ripple  
n
Uses Small Inductors and Ceramic Capacitors  
n
Accurate Programmable Undervoltage Lockout  
n
Independent Tracking, Soft-Start and Power Good  
Circuits Ease Supply Sequencing  
Output Adjustable Down to 800mV  
n
n
Small 4mm × 4mm 24-Pin QFN or 16-Pin Thermally  
Enhanced TSSOP Surface Mount Packages  
APPLICATIONS  
Cycle-by-cycle current limit, frequency foldback and ther-  
malshutdownprovideprotectionagainstshortedoutputs,  
and soft-start eliminates input current surge during start-  
up. The low current (<2μA) shutdown mode enables easy  
power management in battery-powered systems.  
n
Automotive  
n
DSP Power Supplies  
n
Wall Transformer Regulation  
n
DSL and Cable Modems  
n
PCI Express  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners.  
TYPICAL APPLICATION  
3.3V and 5V Dual Output Step-Down Converter with Output Sequencing  
V
IN  
ON OFF  
5.6V TO 36V  
Efficiency  
4.7ꢀF  
V
V
SHDN  
IN1 IN2  
95  
90  
85  
80  
75  
70  
65  
OUT2  
5V  
V
= 12V  
IN  
BOOST1  
BOOST2  
V
V
= 5V  
1.4A  
OUT2  
OUT1  
0.22ꢀF  
0.22ꢀF  
6.8ꢀH  
10ꢀH  
OUT1  
3.3V  
1.4A  
SW1  
SW2  
= 3.3V  
LT3508  
35.7k  
56.2k  
FB1  
FB2  
V
V
C2  
C1  
11.5k  
22ꢀF  
51k  
TRACK/SS1  
TRACK/SS2  
PG1  
PG2  
43k  
10ꢀF  
10.7k  
100k  
GND RT/SYNC  
52.3k  
= 700kHz  
150pF  
1nF  
100pF  
0
0.5  
1
1.5  
LOAD CURRENT (A)  
POWER  
GOOD  
f
SW  
3508 TA01a  
3508 TA01b  
3508fd  
1
1234567...26

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