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LTC3858EUH-2#PBF PDF预览

LTC3858EUH-2#PBF

更新时间： 2024-02-12 01:54:43
品牌 Logo 应用领域
凌特 - Linear 开关
页数 文件大小 规格书
40页 444K
描述
LTC3858-2 - Low IQ, Dual 2-Phase Synchronous Step-Down Controller; Package: QFN; Pins: 32; Temperature Range: -40°C to 85°C

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LTC3858EUH-2#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,
针数：32Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16Is Samacsys：N
其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 24 V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 VJESD-30 代码：S-PQCC-N32
JESD-609代码：e3长度：5 mm
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封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：NOT SPECIFIED
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：PHASE-SHIFT
最大切换频率：900 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：NOT SPECIFIED
宽度：5 mmBase Number Matches：1

LTC3858EUH-2#PBF 数据手册

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LTC3858-2  
Low I , Dual  
Q
2-Phase Synchronous  
Step-Down Controller  
FEATURES  
DESCRIPTION  
n
Low Operating I : 170μA (One Channel On)  
The LTC®3858-2 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.  
Q
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
n
n
n
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  
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  
LTC3858-2differsfromtheLTC3858byhavingtheovervolt-  
ageprotectioncrowbarandshort-circuitlatchoffdisabled.  
A wide 4V to 38V input supply range encompasses a wide  
rangeofintermediatebusvoltagesandbatterychemistries.  
n
n
n
n
n
n
n
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitor  
Low Shutdown I : 8μA  
Q
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-Up  
5mm × 5mm QFN Package  
IN  
CC  
Independent soft-start pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
L,LT,LTC,LTM,BurstMode,OPTI-LOOP,μModule,PolyPhase,LinearTechnologyandtheLinear  
APPLICATIONS  
logoareregisteredtrademarksandNoR  
andUltraFastaretrademarksofLinearTechnology  
SENSE  
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.  
Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258.  
n
Automotive Systems  
n
Battery Operated Digital Devices  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
V
IN  
9V TO 38V  
22μF  
50V  
100  
90  
10000  
1000  
100  
10  
4.7μF  
V
INTV  
CC  
IN  
TG1  
TG2  
80  
0.1μF  
0.1μF  
EFFICIENCY  
BOOST1  
SW1  
BOOST2  
SW2  
3.3μH  
7.2μH  
70  
60  
50  
POWER LOSS  
BG1  
BG2  
LTC3858-2  
PGND  
40  
30  
20  
10  
0
+
+
SENSE1  
SENSE2  
1
0.01Ω  
193k  
0.007Ω  
V
V
= 12V  
OUT  
FIGURE 13 CIRCUIT  
IN  
–
= 3.3V  
–
V
SENSE2  
OUT2  
SENSE1  
FB1  
V
OUT1  
3.3V  
5A  
8.5V  
3.5A  
V
V
FB2  
0.1  
62.5k  
150μF  
0.0001 0.001  
0.01  
0.1  
1
10  
I
I
TH2  
TH1  
SS1  
680pF  
15k  
680pF  
15k  
OUTPUT CURRENT (A)  
150μF  
SGND  
SS2  
20k  
38582 TA01b  
20k  
0.1μF  
0.1μF  
38582 TA01a  
38582f  
1
1234567...40

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