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LTC3720EGN

更新时间： 2024-02-29 21:44:27
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管控制器
页数 文件大小 规格书
24页 294K
描述
Single Phase VRM8.5 Current Mode Step-Down Controller

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LTC3720EGN 数据手册

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LTC3720  
ELECTRICAL CHARACTERISTICS  
The ● denotes specifications which apply over the full operating  
temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
4
MAX  
UNITS  
V
V
V
RUN Pin Latchoff Enable Threshold  
RUN Pin Latchoff Threshold  
Soft-Start Charge Current  
Soft-Start Discharge Current  
Undervoltage Lockout  
RUN/SS Pin Rising  
RUN/SS Pin Falling  
4.5  
RUN/SS(LE)  
RUN/SS(LT)  
RUN/SS(C)  
RUN/SS(D)  
3.5  
–1.2  
1.8  
V
I
I
–0.5  
0.8  
–3  
3
µA  
µA  
V
(UVLO)  
V
V
Falling  
Rising  
●
●
3.4  
3.5  
3.9  
4.0  
V
V
IN  
IN  
IN  
TG R  
TG R  
BG R  
BG R  
TG Driver Pull-Up On Resistance  
TG Driver Pull-Down On Resistance  
BG Driver Pull-Up On Resistance  
BG Driver Pull-Down On Resistance  
TG Rise Time  
TG High  
TG Low  
BG High  
BG Low  
2
2
3
3
4
2
Ω
Ω
UP  
DOWN  
UP  
3
Ω
1
Ω
DOWN  
TG t  
TG t  
C
C
C
C
= 3300pF  
= 3300pF  
= 3300pF  
= 3300pF  
20  
20  
20  
20  
ns  
ns  
ns  
ns  
r
f
LOAD  
LOAD  
LOAD  
LOAD  
TG Fall Time  
BG t  
BG t  
BG Rise Time  
r
f
BG Fall Time  
Internal V Regulator  
CC  
V
Internal V Voltage  
6V < V < 30V, V = 4V  
EXTVCC  
●
●
4.7  
4.5  
5
5.3  
V
%
INTVCC  
CC  
IN  
∆V  
Internal V Load Regulation  
I
I
I
= 0mA to 20mA, V = 4V  
EXTVCC  
–0.1  
4.7  
±2  
LDO(LOADREG)  
CC  
CC  
CC  
CC  
V
EXTV Switchover Voltage  
= 20mA, V  
= 20mA, V  
Rising  
= 5V  
V
EXTVCC  
CC  
EXTVCC  
EXTVCC  
∆V  
∆V  
EXTV Switch Drop Voltage  
150  
200  
300  
mV  
mV  
EXTVCC  
CC  
EXTV Switchover Hysteresis  
EXTVCC(HYS)  
CC  
PGOOD Output  
∆V  
∆V  
∆V  
PGOOD Upper Threshold  
PGOOD Lower Threshold  
PGOOD Hysteresis  
V
V
V
Rising  
5.5  
7.5  
–7.5  
1
9.5  
–9.5  
2
%
%
%
V
FBH  
FB  
Falling  
–5.5  
FBL  
FB  
Returning  
FB(HYS)  
FB  
V
PGOOD Low Voltage  
I
= 5mA  
0.15  
0.4  
PGL  
PGOOD  
VID DAC  
V
V
V
Operating Supply Voltage Range  
VID0-VID4 Logic Threshold Voltage  
VID0-VID4 Leakage Current  
DAC Output Accuracy  
3.1  
0.4  
5.5  
2
V
V
CC  
V
V
V
= 3.3V  
CC  
1.2  
0.01  
0
VID(T)  
VID(LEAK)  
-V  
= V  
±1  
µA  
%
VID0 VID4  
CC  
∆V  
Programmed from  
OSENSE  
1.05V to 1.825V (Note 5), V = 5V  
–0.25  
0.25  
OSENSE  
CC  
R
R
Pull-Up Resistance on VID  
V
= 0.6V (Note 6)  
DIODE  
28  
6
40  
10  
1
56  
14  
10  
kΩ  
kΩ  
µA  
PULLUP  
Resistance from V  
Supply Current  
to V  
FB  
VID  
OSENSE  
I
(Note 7)  
VCC  
Note 1: Absolute Maximum Ratings are those values beyond which the life of  
Note 5: The LTC3720 VID DAC is tested in a feedback loop that adjusts  
toachieveaspecifiedfeedbackvoltage(V =0.8V)foreachDACVID  
a device may be impaired.  
V
OSENSE  
code.  
FB  
Note2:TheLTC3720Eisguaranteedtomeetperformancespecificationsfrom  
0°C to 70°C. Specifications over the –40°C to 85°C operating temperature  
range are assured by design, characterization and correlation with statistical  
process controls.  
Note 6: Each built-in pull-up resistor attached to VID inputs also has a series  
diode connected to V to allow input voltages higher than the V supply  
CC  
CC  
without damage or clamping. (See Operation section for further details.)  
Note 3: T is calculated from the ambient temperature T and power  
Note 7: Supply current is specified with all VID inputs floating. Due to the  
internal pull-ups on the VID pins, the supply current will increase depending  
on the number of grounded VID lines. Each grounded VID line will draw  
J
A
dissipation P as follows:  
D
LTC3720EGN: T = T + (P • 95°C/W)  
J
A
D
approximately (V – 0.6V)/40k mA. (See Operation section for further  
CC  
Note 4: The LTC3720 is tested in a feedback loop that adjusts V to achieve  
FB  
details.)  
a specified error amplifier output voltage (I ).  
TH  
3720f  
3
1234567...24

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