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LTC3856EUH-TRPBF

更新时间： 2024-02-23 20:49:18
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
40页 2221K
描述
2-Phase Synchronous Step-Down DC/DC Controller with Diffamp

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中文翻译

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LTC3856EUH-TRPBF 数据手册

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LTC3856  
2-Phase Synchronous  
Step-Down DC/DC  
Controller with Diffamp  
FeaTures  
n
DescripTion  
PolyPhase® Controller Reduces Input and Output  
The LTC®3856 is a single output, dual channel PolyPhase  
synchronous step-down DC/DC controller that drives all  
N-channel power MOSFET stages. This device includes a  
high speed differential amplifier for remote output volt-  
age sense. Power loss and supply noise are minimized by  
operating the two controller output stages out-of-phase  
and up to 12-phase operation can be achieved.  
Capacitance and Power Supply Induced Noise  
n
Wide V Range: 4.5V to 38V Operation  
IN  
n
±±.ꢀ5ꢁ% ±.ꢂV Reꢃerence Voltage Accuracy  
n
High Eꢃficiency: Up to 95ꢁ  
Programmable Burst Mode® Operation or  
n
Stage Shedding™ ꢃor Highest Light Load Eꢃficiency  
n
Active Voltage Positioning (AVP)  
The LTC3856 monitors the output current by sensing  
the voltage drop across the output inductor (DCR) or by  
using a sense resistor. DCR temperature compensation  
maintains an accurate current sense threshold over a  
broad temperature range. A constant-frequency, current  
mode architecture allows a phase-lockable frequency of  
up to 770kHz.  
n
R
SENSE  
or DCR Current Sensing  
n
n
n
n
n
n
n
n
n
Programmable DCR Temperature Compensation  
Phase-Lockable Fixed Frequency: 25±kHz to ꢀꢀ±kHz  
True Remote Sense Diꢃꢃerential Amplifier  
Dual N-Channel MOSFET Synchronous Drive  
V
V
Range: 0.6V to 5V without Differential Amplifier  
Range: 0.6V to 3.3V with Differential Amplifier  
OUT  
OUT  
A wide 4.5V to 38V input supply range encompasses  
most intermediate bus voltages and battery chemistries.  
Burst Mode operation, continuous or Stage Shedding  
modes are supported. A TK/SS pin shared by both chan-  
nels ramps the output voltage during start-up.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase, Burst Mode and OPTI-LOOP  
are registered trademarks and Stage Shedding is a trademark 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, 6498466,  
6580258, 6611131, 6674274.  
Adjustable Soft-Start or V  
Tracking  
OUT  
Stackable for Up to 12-Phase Operation  
32-Pin (5mm × 5mm) QFN and 38-Pin TSSOP Packages  
applicaTions  
n
Telecom and Datacom Systems  
n
Industrial and Medical Instruments  
n
DC Power Distribution Systems  
Computer Systems  
n
Typical applicaTion  
Eꢃficiency and Power Loss  
vs Output Current  
High Eꢃficiency 1.5V/5±A Step-Down Converter  
V
100  
90  
100  
10  
1
IN  
V
V
= 12V  
4.5V TO  
20V  
IN  
OUT  
10µF  
s 4  
30.1k  
= 1.5V  
DIFFOUT  
TG1  
BOOST1  
SW1  
V
IN  
S
0.33µH  
S
Burst Mode  
OPERATION  
V
FB  
0.1µF  
80  
ILIM  
20k  
LTC3856  
S
70  
RUN  
BG1  
S
S
PLLIN  
PGOOD  
CLKOUT  
PHASMD  
MODE  
ITEMP  
FREQ  
60  
50  
+
SENSE1  
–
SENSE1  
TG2  
BOOST2  
SW2  
40  
30  
20  
10  
0
S
0.33µH  
V
1.5V  
50A  
OUT  
0.1µF  
S
S
S
0
BG2  
122k  
EXTV  
INTV  
S
S
CC  
CC  
+
100µF  
s 8  
DIFFN  
DIFFP  
SENSE2  
SENSE2  
4.7µF  
–
–1  
100  
0.1  
1
10  
I
TH  
TK/SS GND AVP ISET  
2200pF  
1.5k  
LOAD CURRENT (A)  
0.1µF  
3856 TA01b  
S
3856 TA01a  
3856f  
ꢀ
1234567...40

中文翻译

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