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LTC3707

更新时间： 2023-12-20 18:46:27
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
32页 388K
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高效、两相同步降压型开关稳压器

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LTC3707 数据手册

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LTC3707  
The l denotes the specifications which apply over the full operating  
ELECTRICAL CHARACTERISTICS  
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
= 1.2V; (Note 4)  
MIN  
TYP  
MAX UNITS  
g
Transconductance Amplifier GBW  
I
3
MHz  
mGBW1, 2  
TH1, 2  
I
Q
Input DC Supply Current  
Normal Mode  
Standby  
(Note 5)  
EXTV Tied to V  
= 5V  
350  
125  
20  
μA  
μA  
μA  
CC  
OUT1  
= 0V, V  
= 0V, V  
V
V
> 2V  
RUN/SS1, 2  
RUN.SS1, 2  
STBYMD  
STBYMD  
Shutdown  
= Open  
35  
l
V
Forced Continuous Threshold  
Forced Continuous Pin Current  
0.76  
0.800  
–0.18  
4.3  
0.84  
–0.1  
4.8  
V
FCB  
I
V
= 0.85V  
–0.30  
μA  
V
FCB  
FCB  
V
Burst Inhibit (Constant Frequency)  
Threshold  
Measured at FCB pin  
BINHIBIT  
l
l
UVLO  
Undervoltage Lockout  
Feedback Overvoltage Lockout  
Sense Pins Total Source Current  
Master Shutdown Threshold  
Keep-Alive Power On-Threshold  
Maximum Duty Factor  
V
Ramping Down  
3.5  
0.86  
–60  
0.6  
4
V
V
IN  
V
OVL  
Measured at V  
0.84  
–90  
0.4  
0.88  
OSENSE1, 2  
I
(Each Channel); V  
–
– = V  
+
+ = 0V  
μA  
V
SENSE  
SENSE1 , 2  
SENSE1 , 2  
V
V
V
V
Ramping Down  
STBYMD MS  
STBYMD  
STBYMD  
KA  
Ramping Up, RUN  
= 0V  
1.5  
2
V
STBYMD  
SS1, 2  
DF  
In Dropout  
98  
0.5  
1.0  
99.4  
1.2  
%
μA  
V
MAX  
I
Soft-Start Charge Current  
V
V
V
= 1.9V  
RUN/SS1, 2  
RUN/SS1, 2  
V
ON RUN/SS Pin ON Threshold  
V Rising  
RUN/SS1, RUN/SS2,  
1.5  
2.0  
RUN/SS1, 2  
RUN/SS1, 2  
V
LT RUN/SS Pin Latchoff Arming  
Threshold  
V
Rising from 3V  
4.1  
4.75  
V
RUN/SS1, RUN/SS2,  
I
I
RUN/SS Discharge Current  
Soft Short Condition V  
= 0.5V;  
0.5  
2
4
5
μA  
μA  
SCL1, 2  
OSENSE1, 2  
V
V
V
= 4.5V  
RUN/SS1, 2  
OSENSE1, 2  
OSENSE1, 2  
Shutdown Latch Disable Current  
= 0.5V  
1.6  
SDLHO  
V
Maximum Current Sense Threshold  
= 0.7V, V  
– – = 5V  
OSENSE1 , 2  
65  
62  
75  
75  
85  
88  
mV  
mV  
SENSE(MAX)  
l
TG Transition Time:  
Rise Time  
Fall Time  
(Note 6)  
TG1, 2 t  
TG1, 2 t  
C
C
= 3300pF  
60  
60  
110  
110  
ns  
ns  
r
f
LOAD  
LOAD  
= 3300pF  
BG Transition Time:  
Rise Time  
Fall Time  
(Note 6)  
LOAD  
LOAD  
BG1, 2 t  
BG1, 2 t  
C
C
= 3300pF  
= 3300pF  
50  
50  
110  
100  
ns  
ns  
r
f
TG/BG t  
Top Gate Off to Bottom Gate On Delay  
Synchronous Switch-On Delay Time  
1D  
C
C
= 3300pF Each Driver  
80  
ns  
LOAD  
BG/TG t  
Bottom Gate Off to Top Gate On Delay  
Top Switch-On Delay Time  
2D  
= 3300pF Each Driver  
80  
ns  
ns  
LOAD  
t
Minimum On-Time  
Tested with a Square Wave (Note 7)  
180  
ON(MIN)  
INTV Linear Regulator  
CC  
V
V
V
V
V
Internal V Voltage  
6V < V < 30V, V = 4V  
EXTCC  
4.8  
4.5  
5.0  
0.2  
100  
4.7  
0.2  
5.2  
2.0  
200  
V
%
INTVCC  
CC  
IN  
INT  
INTV Load Regulation  
I
CC  
I
CC  
I
CC  
= 0 to 20mA, V  
= 4V  
EXTVCC  
LDO  
LDO  
CC  
EXT  
EXTV Voltage Drop  
= 20mA, V  
= 5V  
EXTVCC  
mV  
V
CC  
l
EXTV Switchover Voltage  
= 20mA, EXTV Ramping Positive  
CC  
EXTVCC  
LDOHYS  
CC  
EXTV Hysteresis  
V
CC  
Oscillator  
f
Oscillator Frequency  
Lowest Frequency  
V
V
= Open (Note 8)  
= 0V  
190  
120  
220  
140  
250  
160  
kHz  
kHz  
OSC  
FREQSET  
f
LOW  
FREQSET  
3707fb  
3
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