EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8570EDD#PBF
LT8570IDD#PBF
LT8570HDD#PBF
LT8570EMS8E#PBF
LT8570IMS8E#PBF
LT8570HMS8E#PBF
LT8570EDD-1#PBF
LT8570IDD-1#PBF
LT8570HDD-1#PBF
LT8570EMS8E-1#PBF
LT8570IMS8E-1#PBF
LT8570HMS8E-1#PBF
TAPE AND REEL
LT8570EDD#TRPBF
LT8570IDD#TRPBF
LT8570HDD#TRPBF
LT8570EMS8E#TRPBF
LT8570IMS8E#TRPBF
LT8570HMS8E#TRPBF
LT8570EDD-1#TRPBF
LT8570IDD-1#TRPBF
LT8570HDD-1#TRPBF
http://www.linear.com/product/LT8570#orderinfo
PART MARKING*
LGRY
LGRY
LGRY
LTGRZ
LTGRZ
LTGRZ
LGSB
LGSB
LGSB
LTGSC
LTGSC
LTGSC
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 150°C
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 150°C
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 150°C
– 40°C to 125°C
– 40°C to 125°C
– 40°C to 150°C
LT8570EMS8E-1#TRPBF
LT8570IMS8E-1#TRPBF
LT8570HMS8E-1#TRPBF
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
85701fa
For more information
www.linear.com/LT8570
LT8570/LT8570-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Voltage Range
Positive Feedback Voltage
Negative Feedback Voltage
Positive FBX Pin Bias Current
Negative FBX Pin Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency, f
OSC
Switching Frequency in Foldback
Switching Frequency Set Range
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio
f
SYNC
/f
OSC
Minimum Off-Time
Minimum On-Time
Switch Current Limit
V
SHDN
= 2.5V, Not Switching
V
SHDN
= 0V
2.55V ≤ V
IN
≤ 40V
R
T
= 56.2k
R
T
= 422k
Compared to Normal f
OSC
SYNCing or Free Running
CONDITIONS
– 40°C to 125°C
– 40°C to 150°C
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
MIN
2.55
2.9
1.185
–3
81
81
1.204
3
83.3
83.3
200
60
1.2
0
0.01
1.5
200
1/6
1.7
1
0.05
1.77
235
1500
0.4
65
3/4
100
100
0.75
0.5
0.4
0.375
0.25
0.2
250
250
0.01
6
1.31
1.27
40
44
12
0
ns
ns
A
A
A
A
A
A
mV
mV
µA
µA
V
V
mV
V
µA
µA
µA
TYP
MAX
40
40
1.220
12
85
86
UNITS
V
V
V
mV
µA
µA
µmhos
V/V
mA
µA
%/V
MHz
kHz
Ratio
kHz
V
V
%
V
FBX
= Positive Feedback Voltage, Current Into Pin
V
FBX
= Negative Feedback Voltage, Current Out of Pin
l
l
l
l
1.23
165
200
1.3
35
l
l
l
V
SYNC
= 0V to 2V
Switch V
CESAT
Switch Leakage Current
Soft-Start Charging Current
SHDN
Minimum Input
Voltage High
SHDN
Minimum Input Voltage Hysteresis
SHDN
Input Voltage Low
SHDN
Pin Bias Current
Minimum Duty Cycle (Note 3), LT8570
Maximum Duty Cycle (Notes 3, 4), LT8570, f
OSC
= 1.5MHz
Maximum Duty Cycle (Notes 3, 4), LT8570, f
OSC
= 200kHz
Minimum Duty Cycle (Note 3), LT8570-1
Maximum Duty Cycle (Notes 3, 4), LT8570-1, f
OSC
= 1.5MHz
Maximum Duty Cycle (Notes 3, 4), LT8570-1, f
OSC
= 200kHz
I
SW
= 0.4A (LT8570)
I
SW
= 0.2A (LT8570-1)
V
SW
= 5V
V
SS
= 0.5V
Active Mode,
SHDN
Rising
Active Mode,
SHDN
Falling
Shutdown Mode
V
SHDN
= 3V
V
SHDN
= 1.3V
V
SHDN
= 0V
l
l
l
l
l
l
0.6
0.27
0.15
0.3
0.15
0.075
1
0.85
0.8
0.5
0.43
0.4
l
l
l
4
1.23
1.21
1
8
1.4
1.33
0.3
56
15
0.1
l
9
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 LT8570E/LT8570-1E are 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
LT8570I/LT8570-1I are guaranteed over the full –40°C to 125°C operating
junction temperature range. The LT8570H/LT8570-1H are guaranteed over
the full –40°C to 150°C operating junction temperature range. Operating
lifetime is derated at junction temperatures greater than 125°C.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Note 4:
Current limit measured at equivalent of listed switching frequency.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
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