Datasheet

LTM8040
2
8040fa
ABSOLUTE MAXIMUM RATINGS
V
IN
............................................................................36V
BIAS .......................................................................... 25V
BIAS + V
IN
................................................................. 51V
LEDA, LPWR .............................................................15V
PWM .........................................................................10V
ADJ .............................................................................6V
RT ...............................................................................3V
SHDN ........................................................................36V
SHDN Above V
IN
.........................................................6V
Internal Operating Temperature (Note 2) ...–40°C to 125°C
Max Solder Temperature ....................................... 245°C
(Note 1)
PIN CONFIGURATION
LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE (NOTE 3)
LTM8040EV#PBF LTM8040EV#PBF LTM8040V
66-Lead 15mm × 9mm × 4.32mm LGA Package
0°C to 125°C
LTM8040IV#PBF LTM8040IV#PBF LTM8040V
66-Lead 15mm × 9mm × 4.32mm LGA Package
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
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/
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
3.5 4 V
Input Quiescent Current Not Switching 2.6 4 mA
SHDN Current SHDN = 0.3V
SHDN = 2.65V
0.01
10.3
2μA
μA
LEDA Current ADJ Open
R
ADJ
= 5.11k
l
l
0.98
0.965
0.49
0.481
1
0.5
1.02
1.035
0.51
0.525
A
A
A
A
ADJ Bias Current ADJ = 0V, Current Flows Out of Pin 245 μA
ADJ Pull-up Resistor 5 5.11 5.22 kΩ
Switching Frequency RT Open 470 500 530 kHz
SHDN Threshold 2.65 V
PWM Threshold V
IH
V
IL
1.2
0.4
V
V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, SHDN = 5V, V
PWM
= 5V, unless otherwise noted (Note 3).
ORDER INFORMATION
V
IN
BANK 3
LEDA
BANK 1
GND
BANK 2
PWM
SHDN
ADJ
RT
BIAS
GND
LPWR
T
JMAX
= 125°C, θ
JA
= 13°C/W, θ
JC
= 4.4°C/W, WEIGHT = 1.73g
66 LEAD (15mm × 9mm × 4.32mm)
θ
JA
DERIVED FROM 6.35cm × 6.35cm 4 LAYER PCB