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LTC3890

更新时间： 2024-11-05 11:45:59
品牌 Logo 应用领域
Linear Systems /
页数 文件大小 规格书
40页 464K
描述
60V Low IQ, Dual, 2-Phase Synchronous Step-Down

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LTC3890 数据手册

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LTC3890  
60V Low I , Dual, 2-Phase  
Q
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-channelsynchronouspowerMOSFETstages.Aconstant  
frequency current mode architecture allows a phase-  
lockable frequency of up to 850kHz. Power loss and noise  
due to the ESR of the input capacitor are minimized by  
operating the two controller output stages out-of-phase.  
n
Wide V Range: 4V to 60V (65V Abs Max)  
IN  
n
Low Operating I : 50µA (One Channel On)  
Q
n
n
n
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
The50μAno-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  
Q
Independent TRACK/SS pins for each controller ramp the  
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.  
Internal LDO Powers Gate Drive from V or EXTV  
IN  
CC  
No Current Foldback During Start-Up  
Small Low Profile (0.75mm) 5mm × 5mm QFN Package  
applicaTions  
n
Automotive Always-On Systems  
n
Battery Operated Digital Devices  
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
Distributed DC Power Systems  
Typical applicaTion  
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter  
Efficiency and Power Loss  
V
vs Output Current  
IN  
9V TO 60V  
22µF  
10000  
1000  
100  
100  
90  
80  
70  
60  
50  
40  
30  
20  
4.7µF  
V
V
= 12V  
IN  
OUT  
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
10  
0
OUT1  
3.3V  
5A  
8.5V  
3A  
V
V
ITH2  
FB1  
FB2  
0.1  
100k  
100k  
10.5k  
ITH1  
0.0001 0.001  
0.01  
0.1  
1
10  
470µF  
1000pF  
34.8k  
1000pF  
330µF  
OUTPUT CURRENT (A)  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
3890 TA01b  
31.6k  
34.8k  
0.1µF  
3890 TA01a  
3890fb  
1
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