(Notes 3, 4) ........................................... –40°C to 125°C
Solder Temperature .............................................. 245°C
Storage Temperature ............................. –55°C to 125°C
RUN SYNC RT
LGA PACKAGE
77-LEAD (15mm 9mm 2.82mm)
T
JMAX
= 125°C,
θ
JA
= 15.7°C/W,
θ
JCtop
= 13.6°C/W,
θ
JCbottom
= 4.5°C/W,
θ
JB
= 9.4°C/W
θ
VALUES DETERMINED PER JESD 51-12
WEIGHT = 1.1g
ORDER INFORMATION
LEAD FREE FINISH
LTM8042EV#PBF
LTM8042IV#PBF
LTM8042EV-1#PBF
LTM8042IV-1#PBF
TRAY
LTM8042EV#PBF
LTM8042IV#PBF
LTM8042EV-1#PBF
LTM8042IV-1#PBF
PART MARKING*
LTM8042V
LTM8042V
LTM8042-1V
LTM8042-1V
PACKAGE DESCRIPTION
77-Lead (15mm
×
9mm
×
2.82mm) LGA
77-Lead (15mm
×
9mm
×
2.82mm) LGA
77-Lead (15mm
×
9mm
×
2.82mm) LGA
77-Lead (15mm
×
9mm
×
2.82mm) LGA
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–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/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
80421fa
2
LTM8042/LTM8042-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC(MIN)
I
LED
PARAMETER
Minimum Input DC Voltage
LTM8042 LED Current
LTM8042-1 LED Current
R
CTL
= 6.81k
V
CLAMP
ΔI
OUT
/I
OUT
I
QVCC
f
SW
Open LED Clamp Voltage
Output Current Line Regulation
V
CC
Supply Current
Switching Frequency
Boost Mode, LED
+
Open
LTM8042, 6V < BSTOUT/BKIN < 30V
LTM8042-1, 6V < BSTOUT/BKIN < 30V
PWM = 0V
RUN = 0V
RT = 90.9k
RT = 22.1k
RT = 6.04k
SS = 0.5V, Out of Pin
V
SYNC
= 2V
1.5
CTL = 0V, Flows Out of Pin
1.5
0.4
60
1.5
0.4
60
Relative to LED
+
, 100k from LED
+
to TG
Relative to LED
+
, 100k from LED
+
to TG
PWM = 0V
1.5
0.4
100
200
0
–7
120
100
100
0.22
0.68
1.7
6
0.3
60
0.4
CTL Open
CTL Open, R
CTL
= 6.81k
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, buck mode with 4Ω load.
CONDITIONS
l
MIN
3
0.9
0.45
0.34
0.17
TYP
MAX
1.05
0.55
0.39
0.20
UNITS
V
A
A
A
A
V
%
%
0.5
36
0.5
0.5
4.2
0.1
0.25
0.8
2
9
1
0.27
0.92
2.3
12
2.5
mA
μA
MHz
MHz
MHz
μA
MHz
μA
V
V
μA
V
V
μA
V
V
μA
V
V
V
V
μA
I
SS
f
SYNC
I
SYNC
V
SYNC(IL)
V
SYNC(IH)
I
CTL
V
RUN(IH)
V
RUN(IL)
I
RUN
V
PWM(IH)
V
PWM(IL)
I
PWM
V
TG(OH)
V
TG(OL)
V
TGEN(IH)
V
TGEN(IL)
I
TGEN
Soft-Start Pin Current
Synchronization Frequency Range
SYNC Pull-Down Current (Into the Pin)
SYNC Input Low
SYNC Input High
CTL Input Bias Current
RUN Input Voltage High
RUN Input Voltage Low
RUN Pin Bias Current
PWM Input Voltage High
PWM Input Voltage Low
PWM Pin Bias Current
TG Output High Voltage
TG Output Low Voltage
TGEN Input Voltage High
TGEN Input Voltage Low
TGEN Pin Bias Current
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:
Absolute maximum voltage at V
CC
, RUN, PWM, TGEN, BSTIN/
BKLED
–
pins is 40V for non-repetitive one second transients and 30V for
continuous operation.
Note 3:
The LTM8042E/LTM8042E-1 are guaranteed to meet performance
specifications from 0°C to 125°C ambient. Specifications over the full
–40°C to 125°C internal operating temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTM8042I/LTM8042I-1 are guaranteed to meet specifications over
the full –40°C to 125°C internal operating temperature range. Note that
the maximum internal temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.
Note 4:
This device includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum internal operating temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
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