Table of Contents
Advertisement
LTC3875
ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifications are at T
SYMBOL
PARAMETER
V
Maximum Current Sense Threshold
SENSE(MAX)(DC)
+
with SNSD
Pin to V
V
Maximum Current Sense Threshold
SENSE(MAX)(NODE)
+
with SNSD
Pin to GND
I
Channel-to-Channel Current
MISMATCH
Mismatch
I
Input DC Supply Current
Q
Normal Mode
Shutdown
UVLO
Undervoltage Lockout
UVLO Hyst
UVLO Hysteresis
V
Feedback Overvoltage Lockout
OVL
I
Soft-Start Charge Current
TK/SS1,2
V
RUN Pin On Threshold
RUN1,2
V
RUN Pin On Hysteresis
RUN1,2HYS
Driver Functions
TG Transition Time
TG1,2 t
Rise Time
r
TG1,2 t
Fall Time
f
BG Transition Time
BG1,2 t
Rise Time
r
BG1,2 t
Fall Time
f
TG/BG t
Top Gate Off to Bottom Gate On
1D
Delay Synchronous Switch-On
Delay Time
BG/TG t
Bottom Gate Off to Top Gate On
2D
Delay Synchronous Switch-On
Delay Time
t
Minimum On-Time
ON(MIN)
4
The
l
= 25°C (Note 2). V
A
CONDITIONS
0°C to 85°C
–
V
= 1.2V, ILIM = 0V
OUT
SNS
(s)
–
V
= 1.2V, ILIM = 1/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 1/2 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 3/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = INTV
SNS
(s)
–40°C to 125°C
–
V
= 1.2V, ILIM = 0V
SNS
(s)
–
V
= 1.2V, ILIM = 1/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 1/2 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 3/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = INTV
SNS
(s)
–
V
= 1.2V, ILIM = 0V
SNS
(s)
–
V
= 1.2V, ILIM = 1/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 1/2 INTV
SNS
(s)
–
V
= 1.2V, ILIM = 3/4 INTV
SNS
(s)
–
V
= 1.2V, ILIM = INTV
SNS
(s)
ILIM = Float, ENTMPB = Float
(Thermal Balance Disabled)
(Note 5)
V
= 15V (without EXTV
IN
V
= 0V
RUN1,2
V
Ramping Down
INTVCC
Measured at V
OSNS1,2
V
= 0V
TK/SS1,2
V
, V
Rising
RUN1
RUN2
(Note 6)
C
= 3300pF
LOAD
C
= 3300pF
LOAD
(Note 6)
C
= 3300pF
LOAD
C
= 3300pF
LOAD
C
= 3300pF Each Driver
LOAD
C
= 3300pF Each Driver
LOAD
(Note 7)
For more information
denotes the specifications which apply over the specified operating
= 15V, V
IN
RUN1,2
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
Enabled)
CC
+
www.linear.com/LTC3875
= 5V unless otherwise noted.
MIN
TYP
MAX
9
10
11
14
15
16
19
20
21
23.5
25
26.5
28.5
30
31.5
8.5
10
11.5
l
13.5
15
16.5
l
17.5
20
22.5
l
22
25
28
l
26.5
30
33.5
l
45
50
55
l
70
75
80
l
95
100
105
l
117.5
125
132.5
l
142.5
150
157.5
l
5
7
10
40
60
3.5
3.7
4.0
0.5
0.625
0.645
0.665
l
1.0
1.25
1.5
l
1.1
1.22
1.35
l
80
25
25
25
25
30
30
90
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
%
mA
µA
V
V
V
µA
V
mV
ns
ns
ns
ns
ns
ns
ns
3875fb
Advertisement
Table of Contents
