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LTC1708-PG PDF预览

LTC1708-PG

更新时间： 2023-12-20 18:44:56
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
32页 335K
描述
双通道、可调、5 位 VID 高效率、两相、电流模式同步降压型 DC/DC控制器

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中文翻译

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LTC1708-PG 数据手册

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LTC1708-PG  
Dual Adjustable 5-Bit VID  
High Efficiency, 2-Phase Current Mode  
Synchronous Buck DC/DC Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®1708 is a dual adjustable 5-bit VID program-  
mablestep-downswitchingregulatorcontrollerthatdrives  
all N-Channel power MOSFET stages. A constant fre-  
quency current mode architecture allows adjustment of  
the frequency up to 300kHz. Power loss and noise due to  
the ESR of the input capacitance are minimized by oper-  
ating the two main controller output stages out of phase.  
■
Out-of-Phase Controllers Reduce Input Capacitance  
and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes COUT  
Power Good Output Monitors Both Outputs  
5-Bit Mobile VID Control, VOUT: 0.9V to 2.0V  
Dual N-Channel MOSFET Synchronous Drive  
±1% Output Voltage Accuracy  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
DC Programmed Fixed Frequency 150kHz to 300kHz  
Wide VIN Range: 3.5V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
OPTI-LOOP compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The precision 0.8V reference is compat-  
ible with future microprocessor generations, and a wide  
3.5V to 30V (36V maximum) input supply range that  
encompasses all battery chemistries. A power good out-  
put indicates when the output voltages are within 7.5% of  
their programmed value.  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Remote Output Voltage Sense  
Low Shutdown Current: 20µA  
A RUN/SS pin for each controller provides both soft-start  
and an optional timed, short-circuit shutdown. Other  
protection features include: internal foldback current lim-  
iting and an output overvoltage crowbar. The forced  
continuous control pin (FCB) can be used to inhibit Burst  
Mode operation or to regulate a third, flyback output.  
5V and 3.3V Standby Regulators  
Selectable Constant Frequency, Burst Mode® and  
Continuous OperUation  
APPLICATIO S  
■
Notebook and Palmtop Computers, PDAs  
Portable Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
V
IN  
4.75V TO 28V  
C
+
IN  
1µF  
10µF  
4.7µF  
D3  
CERAMIC  
D4  
50V  
V
VIDV INTV  
CC  
IN  
CC  
CERAMIC  
M3a  
M3b  
TG1  
TG2  
M1  
×4  
L1  
1µH  
L2  
C
0.47µF  
C
B2  
0.1µF  
B1  
BOOST1  
SW1  
BOOST2  
SW2  
LTC1708-PG  
2.2µH  
M2  
BG1  
BG2  
D1  
D2  
VID0 TO VID4  
PGND  
5 VID BITS  
+
+
SENSE1  
SENSE2  
R
R
SENSE2  
0.01Ω  
SENSE1  
1000pF  
1000pF  
PGOOD  
0.003Ω  
–
–
SENSE1  
SENSE2  
V
1.5V  
4A  
OUT2  
ATTNIN  
EAIN2  
V
OUT1  
R4  
63.4k  
1%  
0.925V TO  
2.00V  
I
I
C
TH1  
TH2  
OUT1  
C
OUT1a  
C
C
C2  
M1: IRF7811  
+
C1  
270µF  
2V  
C
OUT  
RUN/SS1 SGND RUN/SS2  
+
10µF  
R3  
20k  
1%  
1500pF  
220pF  
R
14.1A  
M2: 1RF7809  
180µF  
4V  
6.3V  
CERAMIC  
R
C1  
M3a, M3b: FDS6982  
L1: VISHAY 5050CE  
ATTNOUT CONNECTED TO EAIN1  
SP  
×4  
C
C
C2  
15k  
SS1  
0.1µF  
SS2  
0.1µF  
22k  
SP  
1628 F01  
Figure 1. High Efficiency VID Controlled, 2-Output Step-Down Converter  
1708f  
1
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中文翻译

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