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LTC3858IGN-1#TRPBF PDF预览

LTC3858IGN-1#TRPBF

更新时间： 2024-09-30 20:05:55
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
38页 439K
描述
LTC3858-1 - Low IQ, Dual 2-Phase Synchronous Step-Down Controller; Package: SSOP; Pins: 28; Temperature Range: -40°C to 85°C

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LTC3858IGN-1#TRPBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP28,.25
针数：28Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 24V
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：38 V
最小输入电压：4 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G28JESD-609代码：e3
长度：9.893 mm湿度敏感等级：1
功能数量：1端子数量：28
最高工作温度：125 °C最低工作温度：-40 °C
标称输出电压：5.1 V封装主体材料：PLASTIC/EPOXY
封装代码：SSOP封装等效代码：SSOP28,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 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：900 kHz技术：CMOS
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.635 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：3.9 mmBase Number Matches：1

LTC3858IGN-1#TRPBF 数据手册

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LTC3858-1  
Low I , Dual  
Q
2-Phase Synchronous  
Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3858-1 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  
input capacitor ESR are minimized by operating the two  
controller outputs out of phase.  
n
Low Operating I : 170μA (One Channel On)  
Q
n
n
n
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
Wide V Range: 4V to 38V  
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  
Burst Mode® Operation at Light Loads  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start  
The 170ꢀA no-load quiescent current extends operating  
life in battery powered systems. OPTI-LOOP compensa-  
tion allows the transient response to be optimized over  
a wide range of output capacitance and ESR values. The  
LTC3858-1featuresaprecision0.8Vreferenceandapower  
goodoutputindicator. Awide4Vto38Vinputsupplyrange  
encompasses a wide range of intermediate bus voltages  
and battery chemistries.  
n
n
n
n
n
n
n
n
n
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Output Latchoff Protection During Short Circuit  
Independent soft-start pins for each controller ramp the  
outputvoltagesduringstart-up.Theoutput Latchofffeature  
protects the circuit in short-circuit conditions.  
Low Shutdown I : 8μA  
Q
Internal LDO Powers Gate Drive from V or EXTV  
IN  
CC  
No Current Foldback During Start-Up  
Tiny 4mm × 5mm QFN and Narrow SSOP Packages  
For a leadless 32-pin QFN package with the additional fea-  
tures of adjustable current limit, clock out, phase modula-  
tionandtwoPGOODoutputs,seetheLTC3858datasheet.  
L,LT,LTC,LTM,BurstMode,OPTI-LOOP,μModule,LinearTechnologyandtheLinearlogo  
APPLICATIONS  
n
Automotive Systems  
areregisteredtrademarksandNoR  
andUltraFastaretrademarksofLinearTechnology  
SENSE  
n
Battery Operated Digital Devices  
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.  
Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258.  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
V
Efficiency and Power Loss  
IN  
9V TO 38V  
22μF  
50V  
vs Load Current  
4.7μF  
V
INTV  
CC  
100  
90  
10000  
1000  
100  
10  
IN  
TG1  
TG2  
0.1μF  
0.1μF  
BOOST1  
SW1  
BOOST2  
SW2  
3.3μH  
7.2μH  
80  
70  
EFFICIENCY  
BG1  
BG2  
60  
50  
LTC3858-1  
PGND  
POWER LOSS  
= 12V  
+
+
40  
30  
20  
10  
0
SENSE1  
SENSE1  
SENSE2  
0.01Ω  
193k  
0.007Ω  
–
1
–
V
8.5V  
3.5A  
SENSE2  
OUT2  
V
V
V
OUT1  
3.3V  
5A  
IN  
OUT  
V
V
= 3.3V  
FB1  
FB2  
I
TH2  
62.5k  
FIGURE 12 CIRCUIT  
0.1 10  
OUTPUT CURRENT (A)  
I
TH1  
SS1  
0.1  
150μF  
680pF  
15k  
680pF  
15k  
150μF  
SGND  
SS2  
0.0001 0.001  
0.01  
1
20k  
20k  
0.1μF  
0.1μF  
38581 TA01b  
38581 TA01  
38581fd  
1
1234567...38

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