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LTC3890EUH

更新时间： 2024-11-24 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 435K
描述
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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LTC3890EUH 数据手册

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LTC3890  
60V Low I ,  
Q
Dual, 2-Phase Synchronous  
Step-Down DC/DC Controller  
DESCRIPTION  
FEATURES  
The LTC®3890 is a high performance dual step-down  
switching regulator DC/DC controller that drives all N-  
channel synchronous power MOSFET stages. A constant  
frequency current mode architecture allows a phase-lock-  
able frequency of up to 850kHz. Power loss and noise due  
totheESRoftheinputcapacitorareminimizedbyoperating  
the two controller output stages out-of-phase.  
n
Wide V Range: 4V to 60V (65V Abs Max)  
IN  
n
n
n
n
Low Operating I : 50μA (One Channel On)  
Q
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Selectable Continuous, Pulse Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
n
n
n
The50ꢀAno-loadquiescentcurrentextendsoperatingrun  
timeinbattery-poweredsystems.OPTI-LOOP® compensa-  
tion allows the transient response to be optimized over  
a wide range of output capacitance and ESR values. The  
LTC3890 features a precision 0.8V reference and power  
good output indicators. A wide 4V to 60V input supply  
range encompasses a wide range of intermediate bus  
voltages and battery chemistries.  
n
n
n
n
n
n
n
n
n
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 : < 14μA  
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-up  
Q
Independent TRACK/SS pins for each controller ramp the  
IN  
CC  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
ThePLLIN/MODEpinselectsamongBurstModeoperation,  
pulse skipping mode, or continuous conduction mode at  
light loads. For a leaded package version (28-lead Narrow  
SSOP), see the LTC3890-1 data sheet.  
Small Low Profile (0.75mm) 5mm × 5mm QFN Package  
APPLICATIONS  
n
Automotive Always-On Systems  
L, LT, LTC, LTM, Burst Mode and OPTI-LOOP 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,  
7230497.  
n
Battery Operated Digital Devices  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter  
Efficiency and Power Loss vs  
V
IN  
Output Current (Buck)  
9V TO 60V  
22μF  
4.7μF  
10000  
1000  
100  
100  
90  
80  
70  
60  
50  
40  
30  
20  
V
V
= 12V  
OUT  
IN  
V
IN  
INTV  
CC  
= 3.3V  
TG1  
TG2  
0.1μF  
0.1μF  
BOOST1  
SW1  
BOOST2  
SW2  
4.7μH  
8μH  
BG1  
BG2  
LTC3890  
PGND  
10  
+
+
SENSE1  
SENSE1  
SENSE2  
0.01Ω  
0.008Ω  
1
–
–
V
SENSE2  
OUT2  
V
OUT1  
3.3V  
5A  
10  
0
8.5V  
3A  
V
V
ITH2  
FB1  
FB2  
0.1  
10  
100k  
100k  
10.5k  
ITH1  
0.0001 0.001  
0.01  
0.1  
1
470μF  
1000pF  
34.8k  
1000pF  
34.8k  
330μF  
TRACK/SS1 SGND TRACK/SS2  
0.1μF  
OUTPUT CURRENT (A)  
31.6k  
3890 TA01b  
0.1μF  
3890 TA01  
3890f  
1
1234567...36

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