LTC3788-1(RevA) 데이터 시트보기 (PDF) - Linear Technology
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LTC3788-1 Datasheet PDF : 30 Pages
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LTC3788-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VLOADREG
gm1, 2
IQ
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop;
l
ΔITH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
l
ΔITH Voltage = 1.2V to 2V
Error Amplifier Transconductance
ITH = 1.2V
Input DC Supply Current
(Note 5)
Pulse-Skipping or Forced Continuous Mode RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
(One Channel On)
and RUN2 = 5V; VFB1(2) = 1.25V (No Load)
Pulse-Skipping or Forced Continuous Mode RUN1,2 = 5V; VFB1,2 = 1.25V (No Load)
(Both Channels On)
0.01
0.1
–0.01 –0.1
2
0.9
1.2
Sleep Mode
(One Channel On)
Sleep Mode
(Both Channels On)
RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
and RUN2 = 5V; VFB1(2) = 1.25V (No Load)
RUN1,2 = 5V; VFB1,2 = 1.25V (No Load)
125
190
200
300
Shutdown
RUN1,2 = 0V
8
20
UVLO
VRUN1, 2
VRUNHYS
IRUN1, 2
IRUN1, 2
INTVCC Undervoltage Lockout Thresholds
RUN Pin On Threshold
RUN Pin Hysteresis
RUN Pin Hysteresis Current
RUN Pin Current
VINTVCC Ramping Up
VINTVCC Ramping Down
VRUN Rising
VRUN > 1.28V
VRUN < 1.28V
l
4.1
4.3
l 3.6
3.8
l 1.18 1.28 1.38
100
4.5
0.5
ISS1, 2
VSENSE(MAX)
VSENSE(CM)
ISENSE1, 2+
ISENSE1, 2–
Soft-Start Charge Current
VSS = GND
Maximum Current Sense Threshold
VFB = 1.1V
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage VIN)
SENSE+ Pin Current
VFB = 1.1V
SENSE– Pin Current
VFB = 1.1V
10
l 68
75
82
2.5
38
200
300
±1
t r (TG1, 2)
Top Gate Rise Time
CLOAD = 3300pF (Note 6)
20
t f(TG1,2)
Top Gate Fall Time
CLOAD = 3300pF (Note 6)
20
t r (BG1, 2)
Bottom Gate Rise Time
CLOAD = 3300pF (Note 6)
20
t f(BG1, 2)
Bottom Gate Fall Time
CLOAD = 3300pF (Note 6)
20
RUP(TG1, 2)
Top Gate Pull-Up Resistance
1.2
RDN(TG1, 2)
Top Gate Pull-Down Resistance
1.2
RUP(TG1, 2)
Bottom Gate Pull-Up Resistance
1.2
RDN(TG1, 2)
Bottom Gate Pull-Down Resistance
1.2
t D(TG/BG)
Top Gate Off to Bottom Gate On
CLOAD = 3300pF (Each Driver)
70
Switch-On Delay Time
t D(BG/TG)
Bottom Gate Off to Top Gate On
CLOAD = 3300pF (Each Driver)
70
Switch-On Delay Time
DFMAX(BG1,2) Maximum BG Duty Factor
96
tON(MIN)
Minimum BG On-Time
(Note 7)
110
UNITS
%
%
mmho
mA
mA
μA
μA
μA
V
V
V
mV
μA
μA
μA
mV
V
μA
μA
ns
ns
ns
ns
Ω
Ω
Ω
Ω
ns
ns
%
ns
37881fa
3
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