(Note 3) ...................................................... –40 to 125°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range .................. –65°C to 150°C
52 51 50 49 48 47 46 45 44 43 42 41
FLT1
1
FLT2
2
FLT3
3
PWM1 4
PWM2 5
PWM3 6
V
REF
7
CTRL1 8
CTRL2 9
CTRL3 10
RT 11
SYNC 12
UKG PACKAGE
VARIATION: UKG52(47)
52-LEAD (7mm
×
8mm) PLASTIC QFN
θ
JA
= 28°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3797EUKG#PBF
LT3797IUKG#PBF
TAPE AND REEL
LT3797EUKG#TRPBF
LT3797IUKG#TRPBF
PART MARKING*
LT3797UKG
LT3797UKG
PACKAGE DESCRIPTION
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) 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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
3797f
2
For more information
www.linear.com/LT3797
LT3797
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Minimum Operation Voltage
V
IN
Overvoltage Lockout
V
IN
Shutdown I
Q
V
IN
Operating I
Q
(Not Switching)
INTV
CC
Operating I
Q
(Not Switching)
V
REF
Voltage
V
REF
Line Regulation
SENSEP1-SENSEN1, SENSEP2-SENSEN2,
SENSEP2-SENSEN2 Current Limit Threshold
SENSEP1, SENSEP2, SENSEP3 Input Bias Current Current Out of Pin, SENSEP1, SENSEP2,
SENSEP3 = 0V
SENSEN1, SENSEN2, SENSEN3 Input Bias Current Current Out of Pin
Integrated INTV
CC
Power Supply
INTV
CC
Regulation Voltage
INTV
CC
Undervoltage Lockout Threshold
INTV
CC
Line Regulation (ΔV
INTVCC
/ΔV
IN
)
Error Amplifiers
LED Current Sense Threshold (ISP1-ISN1,
ISP2-ISN2, ISP3-ISN3)
8/10th LED Current Sense Threshold (ISP1-ISN1,
ISP2-ISN2, ISP3-ISN3)
1/10th LED Current Sense Threshold (ISP1-ISN1,
ISP2-ISN2, ISP3-ISN3)
CTRL1, CTRL2, CTRL3 Range for Linear Current
Sense Threshold Adjustment
CTRL1, CTRL2, CTRL3 Input Bias Current
CTRL1, CTRL2, CTRL3 Idle Mode Threshold
LED Current Sense Amplifier Input Common Mode
Range (ISN1, ISN2, ISN3)
LED Overcurrent Protection Threshold
(ISP1-ISN1, ISP2-ISN2, ISP3-ISN3)
ISP1, ISP2, ISP3 Input Bias Current (Active)
ISP1, ISP2, ISP3 Input Bias Current (Idle)
ISP1, ISP2, ISP3, FBH1, FBH2, FBH3 = 48V
ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 48V
ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 0V
PWM1, PWM2, PWM3=0V , ISP1, ISP2, ISP3, ISN1,
ISN2, ISN3 = 48V
PWM1, PWM2, PWM3, ISP1, ISP2, ISP3, ISN1,
ISN2, ISN3 = 0V
ISN1, ISN2, ISN3 Input Bias Current (Active)
ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 48V
ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 0V
Current Out of Pin, CTRL1, CTRL2, CTRL3 = 0.3V
Falling
Hysteresis
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
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