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LTC3786_15 Datasheet, PDF (3/34 Pages) Linear Technology – Low IQ Synchronous Boost Controller
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LTC3786
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 UNITS
Main Control Loop
VBIAS
Chip Bias Voltage Operating Range
4.5
38
V
VFB
IFB
VREFLNREG
VLOADREG
gm
IQ
Regulated Feedback Voltage
Feedback Current
ITH = 1.2V (Note 4)
(Note 4)
Reference Line Voltage Regulation
Output Voltage Load Regulation
Error Amplifier Transconductance
Input DC Supply Current
Pulse-Skipping or Forced Continuous Mode
Sleep Mode
Shutdown
VBIAS = 6V to 38V
(Note 4)
Measured in Servo Loop;
∆ITH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
∆ITH Voltage = 1.2V to 2V
ITH = 1.2V
(Note 5)
RUN = 5V; VFB = 1.25V (No Load)
RUN = 5V; VFB = 1.25V (No Load)
RUN = 0V
l 1.188 1.200 1.212
V
±5
±50
nA
0.002 0.02
%/V
l
0.01
0.1
%
l
–0.01 –0.1
%
2
mmho
0.8
mA
55
80
µA
8
20
µA
UVLO
VRUN
VRUNHYS
IRUNHYS
IRUN
ISS
VSENSE(MAX)
VSENSE(CM)
ISENSE+
ISENSE–
tr(TG)
tf(TG)
tr(BG)
tf(BG)
RUP(TG)
RDN(TG)
RUP(BG)
RDN(BG)
tD(TG/BG)
INTVCC Undervoltage Lockout Thresholds
RUN Pin On Threshold
RUN Pin Hysteresis
RUN Pin Hysteresis Current
RUN Pin Current
Soft-Start Charge Current
Maximum Current Sense Threshold
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage VIN)
SENSE+ Pin Current
SENSE– Pin Current
Top Gate Rise Time
Top Gate Fall Time
Bottom Gate Rise Time
Bottom Gate Fall Time
Top Gate Pull-Up Resistance
Top Gate Pull-Down Resistance
Bottom Gate Pull-Up Resistance
Bottom Gate Pull-Down Resistance
Top Gate Off to Bottom Gate On Switch-On
Delay Time
VINTVCC Ramping Up
VINTVCC Ramping Down
VRUN Rising
VRUN > 1.28V
VRUN < 1.28V
VSS = 0V
VFB = 1.1V
VFB = 1.1V
VFB = 1.1V
CLOAD = 3300pF (Note 6)
CLOAD = 3300pF (Note 6)
CLOAD = 3300pF (Note 6)
CLOAD = 3300pF (Note 6)
CLOAD = 3300pF (Each Driver)
l
4.1
4.3
V
l 3.6
3.8
V
l 1.18 1.28 1.38
V
100
mV
4.5
µA
0.5
µA
7
10
13
µA
l 68
75
82
mV
2.5
38
V
200
300
µA
±1
µA
20
ns
20
ns
20
ns
20
ns
1.2
Ω
1.2
Ω
1.2
Ω
1.2
Ω
80
ns
tD(BG/TG)
Bottom Gate Off to Top Gate On Switch-On
Delay Time
CLOAD = 3300pF (Each Driver)
80
ns
DFMAXBG
tON(MIN)
Maximum BG Duty Factor
Minimum BG On-Time
(Note 7)
96
%
110
ns
3786fa
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