EN/UVLO Voltage ......................................................42V
BIAS Voltage .............................................. –0.3V to 15V
Operating Junction Temperature (Notes 2 and 3)
LT8601E ............................................. –40°C to 125°C
LT8601I.............................................. –40°C to 125°C
Storage Temperature Range .............. –65°C to 150°C
40 39 38 37 36 35 34 33 32 31
PG1 1
GND 2
SW1 3
BST1 4
BST2 5
SW2 6
SW2 7
GND 8
GND 9
BIAS 10
UJ PACKAGE
40-LEAD (6mm
×
6mm) PLASTIC QFN
θ
JA
= 33°C/W,
θ
JC
= 2°C/W
EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT8601EUJ#PBF
LT8601IUJ#PBF
TAPE AND REEL
LT8601EUJ#TRPBF
LT8601IUJ#TRPBF
http://www.linear.com/product/LT8601#orderinfo
PART MARKING*
LT8601
LT8601
PACKAGE DESCRIPTION
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
8601fa
For more information
www.linear.com/LT8601
LT8601
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= PV
IN1
= PV
IN2
= 12V, EN/UVLO = 3V, PV
IN3
= 3.3V unless otherwise
noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Minimum Operating Voltage to Start
V
IN
Quiescent Current, Shutdown
V
IN
Quiescent Current, Operating
EN/UVLO Threshold
EN/UVLO Input Current
Oscillator
Switching Frequency
SYNC Input Frequency Range
SYNC Input Voltage Low
SYNC Input Voltage High
SYNC Input Current
Channel 1
Feedback Voltage
Input Current FB1
FB1 Voltage Line Regulation
SW1 Peak Current Limit
SW1 Leakage Current
SW1 Top On Resistance
SW1 Bottom On Resistance
Lower FB1 Power Good Threshold
Upper FB1 Power Good Threshold
PG1 Output Voltage Low
PG1 Leakage Current
TRKSS1 Pull-Up Current
Minimum Switch-On Time
Minimum Switch-Off Time
Channel 2
Feedback Voltage
Input Current FB2
FB2 Voltage Line Regulation
SW2 Peak Current Limit
SW2 Leakage Current
SW2 Top On Resistance
SW2 Bottom On Resistance
Lower FB2 Power Good Threshold
Upper FB2 Power Good Threshold
PG2 Output Voltage Low
I
SW2
= 1A
I
SW2
= 1A
Percentage of V
FB2
Percentage of V
FB2
I
PG2
= –350µA
l
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
l
l
MIN
TYP
2.7
3.1
0.1
30
70
MAX
3
3.5
1
UNITS
V
V
µA
µA
µA
EN/UVLO = 0.4V
All Channels Active, No Load (Note 4)
All Channels Active,100µA on V
OUT2
(Note 4)
EN/UVLO Rising
EN/UVLO Falling
EN/UVLO = 1.2V, V
IN
= 42V
R
T
= 28.7k
R
T
= 254k
l
l
l
l
l
l
l
1.15
1.0
−40
1.8
0.225
0.25
1.2
−100
0.988
−100
1.2
1.15
1.25
1.2
40
V
V
nA
MHz
MHz
MHz
V
V
nA
V
nA
%/V
A
µA
mΩ
mΩ
2
0.25
2.2
0.275
2.2
0.3
100
1
0.002
1.012
100
0.01
3.0
1
V
IN
= 3V to 42V
V
IN
= PV
IN1
= PV
IN2
= 6V
I
SW1
= 1A
I
SW1
= 1A
Percentage of V
FB1
Percentage of V
FB1
I
PG1
= –350μA
PG1 = 5V, FB1 = 1V
TRKSS1 = 0.2V
I
SW1
= 1A
I
SW1
= 1A
0.988
−100
l
l
l
l
2.3
2.7
0.1
240
170
89
105
92
108
0.13
95
111
0.3
30
3.1
%
%
V
μA
μA
ns
ns
1.5
2.4
60
70
1
0.002
1.012
100
0.01
4.5
1
V
nA
%/V
A
µA
mΩ
mΩ
V
IN
= 3V to 42V
V
IN
= PV
IN1
= PV
IN2
= 6V
3.5
4.0
0.1
150
100
89
105
92
108
0.13
95
111
0.3
%
%
V
8601fa
For more information
www.linear.com/LT8601
3
LT8601
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= PV
IN1
= PV
IN2
= 12V, EN/UVLO = 3V, PV
IN3
= 3.3V unless otherwise
noted. (Note 2)
PARAMETER
PG2 Leakage Current
TRKSS2 Pull-Up Current
Minimum Switch-On Time
Minimum Switch-Off Time
Channel 3
Operating Voltage
Feedback Voltage
Input Current FB3
FB3 Voltage Line Regulation
SW3 Current Limit
SW3 Leakage
SW3 PMOS On Resistance
SW3 NMOS On Resistance
Lower FB3 Power Good Threshold
Upper FB3 Power Good Threshold
PG3 Output Voltage Low
PG3 Leakage Current
RUN3 Threshold Voltage
RUN3 Input Current
Soft-Start Time
Minimum Switch-On Time
Minimum Switch-Off Time
PV
IN3
UVLO
Power-On Reset
CPOR Pull-Up Current
POR Delay Time
RST
Output Voltage Low
RST
Pull-Up Current
RST
Leakage Current
POREN Threshold
POREN Pull-Up Current
POREN = 0V
CPOR = 0V
CPOR = 1000pF
I
RST
= –100μA
POR Timed Out,
RST
= 0V
RST
= 6V, EN/UVLO = 0V
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
PG2 = 5V, FB2 = 1V
TRKSS2 = 0.2V
I
SW2
= 2A
I
SW2
= 2A
l
MIN
1.5
TYP
2.4
55
70
MAX
30
3.1
UNITS
µA
µA
ns
ns
2.6
790
–100
0.002
2.6
3.2
0.1
150
120
800
5.5
810
100
0.01
3.8
1
V
mV
nA
%/V
A
µA
mΩ
mΩ
V
IN
= 3V to 42V
PV
IN3
= 5.5V
I
SW3
= 1A
I
SW3
= 1A
Percentage of V
FB3
Percentage of V
FB3
I
PG3
= –350μA
PG3 = 5V, FB3 = 0.8V
RUN3 = 3.3V
I
SW3
= 1A
I
SW3
= 1A
l
l
l
l
l
l
l
l
89
105
92
108
0.13
95
111
0.3
30
0.74
100
1.3
%
%
V
µA
V
nA
ms
ns
ns
0.695
–100
0.7
0.72
1
70
70
2.35
2
2.6
V
μA
31
35.2
0.1
20
39.4
0.2
40
ms
V
μA
nA
V
μA
–40
1.15
0.8
1.2
1.2
1.25
1.6
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT8601E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT8601I is guaranteed to meet performance specifications from –40°C
to 125°C junction temperature. High junction temperatures degrade
operating lifetimes. Operating lifetime is derated at junction temperatures
above 125°C.
Note 3:
This IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum junction temperature will reduce
lifetime.
Note 4:
All three channels enabled as shown in the application circuit
titled, “Details of the Front Page Application” (using the 1MHz component
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