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LTC3850EUF-PBF

更新时间： 2024-02-02 14:48:58
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
36页 520K
描述
Dual, 2-Phase Synchronous Step-Down Switching Controller

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LTC3850EUF-PBF 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：5.31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：30 V最小输入电压：4 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G28
JESD-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：85 °C
最低工作温度：-40 °C最大输出电流：0.1 A
标称输出电压：5 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：860 kHz技术：CMOS
温度等级：INDUSTRIAL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：3.899 mm

LTC3850EUF-PBF 数据手册

 浏览型号LTC3850EUF-PBF的Datasheet PDF文件第2页浏览型号LTC3850EUF-PBF的Datasheet PDF文件第3页浏览型号LTC3850EUF-PBF的Datasheet PDF文件第4页浏览型号LTC3850EUF-PBF的Datasheet PDF文件第5页浏览型号LTC3850EUF-PBF的Datasheet PDF文件第6页浏览型号LTC3850EUF-PBF的Datasheet PDF文件第7页 
LTC3850/LTC3850-1  
Dual, 2-Phase  
Synchronous Step-Down  
Switching Controller  
DESCRIPTION  
The LTC®3850 is a high performance dual synchronous  
step-down switching regulator controller that drives all  
N-channel power MOSFET stages. A constant-frequency  
current mode architecture allows a phase-lockable fre-  
quency of up to 780kHz. Power loss and supply noise are  
minimized by operating the two controller output stages  
out of phase.  
OPTI-LOOP® compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The LTC3850 features a precision 0.8V  
reference and a power good output indicator. A wide 4V to  
24V(28Vmaximum/30VforLTC3850I)inputsupplyrange  
encompasses most battery chemistries and intermediate  
bus voltages.  
FEATURES  
n
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
n
High Efficiency: Up to 95%  
n
R
or DCR Current Sensing  
SENSE  
n
n
n
n
n
1% 0.8V ꢀutput Voltage Accuracy  
Phase-Lockable Fixed Frequency 250kHz to 780kHz  
Supports Pre-Biased Output  
Dual N-Channel MOSFET Synchronous Drive  
Wide V Range: 4V to 24V (30V for LTC3850I)  
IN  
Operation  
n
n
n
n
n
Adjustable Soft-Start Current Ramping or Tracking  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Power Good Output Voltage Monitor  
28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow  
SSOP Packages  
Independent TK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit condi-  
tions. The MODE/PLLIN pin selects among Burst Mode®  
operation, pulse-skipping mode, or continuous inductor  
current mode and allows the IC to be synchronized to an  
external clock.  
APPLICATIONS  
n
Notebook and Palmtop Computers  
n
Portable Instruments  
n
Battery-Operated Digital Devices  
DC Power Distribution Systems  
n
TheLTC3850isavailableinlowprofile28-pin4mm×4mm,  
4mm × 5mm QFN and narrow SSOP packages.  
L, LT, LTC, LTM, OPTI-LOOP and BURST MODE are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.  
Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.  
TYPICAL APPLICATION  
High Efficiency Dual 3.3V/2.5V Step-Down Converter  
Efficiency  
V
IN  
100  
95  
10000  
1000  
100  
7V TO  
24V  
22μF  
50V  
V
V
= 12V  
IN  
OUT  
4.7μF  
= 3.3V  
EFFICIENCY  
V
PGOOD INTV  
IN  
CC  
90  
TG1  
TG2  
0.1μF  
0.1μF  
85  
BOOST1  
SW1  
BOOST2  
SW2  
2.2μH  
2.2μH  
80  
75  
LTC3850  
2.2k  
BG2  
PGND  
BG1  
70  
65  
60  
55  
50  
2.2k  
500kHz  
MODE/PLLIN  
I
FREQ/PLLFLTR  
POWER LOSS  
1000  
LIM  
+
–
+
SENSE1  
RUN1  
SENSE1  
SENSE2  
0.1μF  
0.1μF  
RUN2  
–
V
SENSE2  
OUT1  
3.3V  
5A  
V
OUT2  
10  
10000  
V
FB1  
V
FB2  
2.5V  
10  
100  
5A  
63.4k  
43.2k  
I
I
LOAD CURRENT (mA)  
TH1  
TH2  
10nF  
10k  
220pF  
15k  
220pF  
15k  
38501 TA01b  
TK/SS1 SGND TK/SS2  
100μF  
6V  
100μF  
6V  
20k  
20k  
0.1μF  
0.1μF  
38501 TA01  
38501fb  
1
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