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LTC3857EUH#PBF

更新时间： 2024-01-17 17:47:17
品牌 Logo 应用领域
凌特 - Linear 开关
页数 文件大小 规格书
38页 452K
描述
LTC3857 - Low IQ, Dual, 2-Phase Synchronous Step-Down Controller; Package: QFN; Pins: 32; Temperature Range: -40°C to 85°C

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LTC3857EUH#PBF 技术参数

是否Rohs认证：符合生命周期：Transferred
零件包装代码：QFN包装说明：HVQCCN, LCC32,.2SQ,20
针数：32Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：3.51Is Samacsys：N
其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 24V模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：38 V最小输入电压：4 V
标称输入电压：12 VJESD-30 代码：S-PQCC-N32
JESD-609代码：e3长度：5 mm
湿度敏感等级：1功能数量：1
端子数量：32最高工作温度：85 °C
最低工作温度：标称输出电压：5.1 V
封装主体材料：PLASTIC/EPOXY封装代码：HVQCCN
封装等效代码：LCC32,.2SQ,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）：260
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：PHASE-SHIFT最大切换频率：850 kHz
技术：CMOS温度等级：OTHER
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：5 mm
Base Number Matches：1

LTC3857EUH#PBF 数据手册

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LTC3857  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down  
Controller  
FEATURES  
DESCRIPTION  
The LTC®3857 is a high performance dual step-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
current mode architecture allows a phase-lockable fre-  
quency of up to 850kHz. Power loss and noise due to the  
ESRoftheinputcapacitorESRareminimizedbyoperating  
the two controller output stages out of phase.  
n
Low Operating I : 50μA (One Channel On)  
Q
n
n
n
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
Wide V Range: 4V to 38V (40V Abs Max)  
IN  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
n
n
n
OUT  
Phase-Lockable Frequency (75kHz-850kHz)  
Programmable Fixed Frequency (50kHz-900kHz)  
Selectable Continuous, Pulse-Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
Selectable Current Limit  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitors  
Output Overvoltage Protection  
Low Shutdown I : <8μA  
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-up  
5mm × 5mm QFN Package  
The 50ꢀA no-load quiescent current extends operating run  
time in battery-powered systems. The LTC3857 features a  
precision0.8Vreferenceandpowergoodoutputindicators.  
A wide 4V to 38V input supply range encompasses a wide  
range of intermediate bus voltages and battery chemistries.  
n
n
n
n
n
n
n
n
n
Independent TRACK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
The PLLIN/MODE pin selects among Burst Mode opera-  
tion,pulse-skippingmode,orcontinuousinductorcurrent  
mode at light loads.  
Q
IN  
CC  
For a leaded 28-lead SSOP package with a fixed current  
limit and one PGOOD output, without phase modulation  
or a clock output, see the LTC3857-1 data sheet.  
APPLICATIONS  
n
Automotive Always-On Systems  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, μModule, Linear Technology and the  
Linear logo are registered trademarks and No R  
and UltraFast are trademarks of Linear  
SENSE  
n
Battery Operated Digital Devices  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 5481178, 5929620, 6177787, 6144194, 5408150,  
6580258, 5705919, 6100678.  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
Efficiency and Power Loss  
High Efficiency Dual 3.3V/8.5V Step-Down Converter  
V
IN  
vs Output Current  
9V TO 38V  
22μF  
50V  
100  
90  
10000  
1000  
100  
10  
4.7μF  
V
V
= 12V  
IN  
OUT  
V
IN  
INTV  
CC  
= 3.3V  
TG1  
TG2  
FIGURE 13 CIRCUIT  
80  
0.1μF  
0.1μF  
BOOST1  
SW1  
BOOST2  
SW2  
3.3μH  
7.2μH  
70  
60  
50  
BG1  
BG2  
LTC3857  
PGND  
40  
30  
20  
10  
0
+
+
SENSE1  
SENSE1  
SENSE2  
0.010Ω  
193k  
0.007Ω  
1
–
–
V
SENSE2  
OUT2  
V
OUT1  
3.3V  
5A  
8.5V  
3.5A  
V
V
I
FB1  
FB2  
0.1  
62.5k  
I
0.000010.0001 0.001 0.01  
0.1  
1
10  
TH1  
TH2  
150μF  
680pF  
15k  
680pF  
150μF  
OUTPUT CURRENT (A)  
TRACK/SS1 SGND TRACK/SS2  
0.1μF  
20k  
3857 TA01b  
20k  
15k  
0.1μF  
3857 TA01  
3857fd  
1
1234567...38

中文翻译

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LTC3857EUH#PBF 替代型号

型号 品牌 替代类型 描述 数据表
LTC3857EUH#TRPBF Linear

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