LTC3787
ELECTRICAL CHARACTERISTICS
SYMBOL
VBIAS
V
FB
I
FB
V
REFLNREG
V
LOADREG
PARAMETER
Chip Bias Voltage Operating Range
Regulated Feedback Voltage
Feedback Current
Reference Line Voltage Regulation
Output Voltage Load Regulation
(Note 4)
I
TH
= 1.2V (Note 4)
(Note 4)
VBIAS = 6V to 38V
Measured in Servo Loop;
ΔI
TH
Voltage = 1.2V to 0.7V
Measured in Servo Loop;
ΔI
TH
Voltage = 1.2V to 2V
g
m
I
Q
Error Amplifier Transconductance
Input DC Supply Current
Pulse-Skipping or Forced Continuous Mode
Sleep Mode
Shutdown
INTV
CC
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
V
RUN
> 1.28V
V
RUN
< 1.28V
V
SS
= GND
V
FB
= 1.1V, I
LIM
= INTV
CC
V
FB
= 1.1V, I
LIM
= Float
V
FB
= 1.1V, I
LIM
= GND
V
FB
= 1.1V, I
LIM
= INTV
CC
V
FB
= 1.1V, I
LIM
= Float
V
FB
= 1.1V, I
LIM
= GND
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
CONDITIONS
MIN
4.5
1.188
1.200
±5
0.002
0.01
–0.01
2
1.2
135
8
l
l
l
TYP
MAX
38
1.212
±50
0.02
0.1
–0.1
UNITS
V
V
nA
%/V
%
%
mmho
mA
μA
μA
V
V
V
mV
μA
μA
Main Control Loop
I
TH
= 1.2V
(Note 5)
RUN = 5V; V
FB
= 1.25V (No Load)
RUN = 5V; V
FB
= 1.25V (No Load)
RUN = 0V
V
INTVCC
Ramping Up
V
INTVCC
Ramping Down
V
RUN
Rising
3.6
1.18
300
20
4.3
1.38
UVLO
V
RUN
V
RUNHYS
I
RUNHYS
I
RUN
I
SS
V
SENSE1,2(MAX)
4.1
3.8
1.28
100
4.5
0.5
7
90
68
42
–12
–10
–9
2.5
10
100
75
50
0
0
0
13
110
82
56
12
10
9
38
μA
mV
mV
mV
mV
mV
mV
V
μA
μA
ns
ns
ns
ns
Ω
Ω
Ω
Ω
ns
ns
%
ns
3787fc
V
SENSE(MATCH)
Matching Between V
SENSE1(MAX)
and
V
SENSE2(MAX)
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V
IN
)
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
Bottom Gate Off to Top Gate On Switch-On
Delay Time
Maximum BG Duty Factor
Minimum BG On-Time
V
SENSE(CM)
I
SENSE1,2+
I
SENSE1,2–
t
r(TG1,2)
t
f(TG1,2)
t
r(BG1,2)
t
r(BG1,2)
R
UP(TG1,2)
R
DN(TG1,2)
R
UP(TG1,2)
R
DN(TG1,2)
t
D(TG/BG)
t
D(BG/TG)
DF
BG1,2(MAX)
t
ON(MIN)
V
FB
= 1.1V, I
LIM
= Float
V
FB
= 1.1V, I
LIM
= Float
C
LOAD
= 3300pF (Note 6)
C
LOAD
= 3300pF (Note 6)
C
LOAD
= 3300pF (Note 6)
C
LOAD
= 3300pF (Note 6)
200
20
20
20
20
1.2
1.2
1.2
1.2
300
±1
C
LOAD
= 3300pF (Each Driver)
C
LOAD
= 3300pF (Each Driver)
70
70
96
(Note 7)
110
3
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
