LTC3865/LTC3865-1
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loops
V
V
Input Voltage
4.5
38
V
IN
Output Voltage Sensing (E-Grade)
(Note 4) I
Voltage = 1.2V
OSENSE1,2
TH1,2
l
l
l
l
l
l
l
l
l
VID11 = VID21 = GND, VID12 = VID22 = GND
VID11 = VID21 = GND, VID12 = VID22 = Float
VID11 = VID21 = GND, VID12 = VID22 = INTV
VID11 = VID21 = Float, VID12 = VID22 = GND
VID11 = VID21 = Float, VID12 = VID22 = Float
1.089
0.990
1.188
1.485
0.596
1.782
2.463
3.251
4.925
1.100
1.000
1.200
1.500
0.602
1.800
2.500
3.300
5.000
1.111
1.010
1.212
1.515
0.608
1.818
2.538
3.350
5.075
V
V
V
V
V
V
V
V
V
CC
VID11 = VID21 = Float, VID12 = VID22 = INTV
CC
VID11 = VID21 = INTV , VID12 = VID22 = GND
CC
CC
CC
VID11 = VID21 = INTV , VID12 = VID22 = Float
VID11 = VID21 = INTV , VID12 = VID22 = INTV
CC
Output Voltage Sensing (I-Grade)
(Note 4) I
Voltage = 1.2V
TH1,2
l
l
l
l
l
l
l
l
l
VID11 = VID21 = GND, VID12 = VID22 = GND
VID11 = VID21 = GND, VID12 = VID22 = Float
VID11 = VID21 = GND, VID12 = VID22 = INTV
VID11 = VID21 = Float, VID12 = VID22 = GND
VID11 = VID21 = Float, VID12 = VID22 = Float
1.084
0.985
1.182
1.478
0.593
1.773
2.450
3.234
4.900
1.100
1.000
1.200
1.500
0.602
1.800
2.500
3.300
5.000
1.117
1.015
1.218
1.523
0.611
1.827
2.550
3.366
5.100
V
V
V
V
V
V
V
V
V
CC
VID11 = VID21 = Float, VID12 = VID22 = INTV
CC
VID11 = VID21 = INTV , VID12 = VID22 = GND
CC
CC
CC
VID11 = VID21 = INTV , VID12 = VID22 = Float
VID11 = VID21 = INTV , VID12 = VID22 = INTV
CC
I
Feedback Current
(Note 4) VID11 = VID21 = VID12 = VID22 = Float
–10
–50
nA
OSENSE1,2
V
V
Reference Voltage Line Regulation
Output Voltage Load Regulation
V
= 4.5V to 38V (Note 4)
0.002
0.02
%/V
REFLNREG
LOADREG
IN
(Note 4)
Measured in Servo Loop; ∆I Voltage = 1.2V to 0.7V
Measured in Servo Loop; ∆I Voltage = 1.2V to 1.6V
l
l
0.01
–0.01
0.1
–0.1
%
%
TH
TH
g
m1,2
Transconductance Amplifier g
I = 1.2V; Sink/Source 5µA; (Note 4)
TH1,2
2.2
mmho
m
I
Input DC Supply Current
Normal Mode
Shutdown
(Note 5)
IN
RUN1,2
Q
V
V
= 15V
3
30
mA
µA
= 0V
50
UVLO
UVLO
Undervoltage Lockout on INTV
UVLO Hysteresis
V
Ramping Down
3.3
0.55
0.66
1
V
V
CC
INTVCC
HYS
l
V
Feedback Overvoltage Lockout
Sense Pins Total Current
Maximum Duty Cycle
Measured at V
with VID Pins Floating
0.64
0.68
2
V
OVL
OSENSE1,2
I
(Each Channel); V
= 3.3V
SENSE1,2
µA
%
SENSE
DF
MAX
In Dropout
94
0.9
1.1
95
I
Soft-Start Charge Current
RUN Pin On Threshold
RUN Pin On Hysteresis
RUN Pin Current Hysteresis
V
= 0V
1.3
1.22
80
1.7
µA
V
TK/SS1,2
TK/SS1,2
l
V
V
V
, V Rising
1.35
RUN1,2
RUN1 RUN2
mV
µA
RUN1,2HYS
RUN1,2HYS
I
4.5
l
l
l
l
V
Maximum Current Sense Threshold
(E-Grade)
V
V
V
= 3.3V, I = 0V
24
44
30
50
36
56
mV
mV
mV
mV
SENSE(MAX)
ITH1,2
ITH1,2
ITH1,2
LIM
= 3.3V, I = Float
LIM
= 3.3V, I = INTV
68
75
82
LIM
CC
In Overvoltage Condition
–63
–53
–43
l
l
l
l
Maximum Current Sense Threshold
(I-Grade)
V
V
V
= 3.3V, I = 0V
22
42
30
50
38
58
V
V
V
V
ITH1,2
ITH1,2
ITH1,2
LIM
= 3.3V, I = Float
LIM
= 3.3V, I = INTV
66
75
84
LIM
CC
In Overvoltage Condition
–65
–53
–41
TG R
TG R
BG R
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
TG High
2.6
1.5
3
Ω
Ω
UP
TG Low
DOWN
UP
BG High
Ω
3865f
ꢃ