Datasheet

2
LT1619
1619fa
Input Voltage (V
IN
) ................................... –0.3V to 20V
Gate Drive Supply Voltage (DRV) ............. –0.3V to 20V
Shutdown/Synch Voltage (S/S) ................ –0.3V to 20V
Feedback Voltage (FB) .............................................. V
IN
Compensation Voltage (V
C
) ...................................... 3V
Gate Drive Output Current (GATE) ........................ ±1.5A
Current Sense Voltage (SENSE) .................–0.5V to V
IN
Operating Temperature Range (Note 2) .. –40°C to 85°C
Junction Temperature (Note 3)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 200°C/W
T
JMAX
= 125°C, θ
JA
= 120°C/W
(Note 1)
ORDER PART
NUMBER
MS8 PART MARKING
LT1619EMS8
LTHC
1
2
3
4
S/S
FB
V
C
GND
8
7
6
5
V
IN
DRV
GATE
SENSE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
ORDER PART
NUMBER
S8 PART MARKING
LT1619ES8
1619
1
2
3
4
8
7
6
5
TOP VIEW
V
IN
DRV
GATE
SENSE
S/S
FB
V
C
GND
S8 PACKAGE
8-LEAD PLASTIC SO
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage Measured at the FB Pin ● 1.22 1.24 1.26 V
Reference Line Regulation 1.9V ≤ V
IN
≤ 18V 0.004 0.05 %/V
FB Input Bias Current V
FB
= V
REF
10 25 nA
Error Amplifier Transconductance 80 170 260 µΩ
–1
Error Amplifier Output Source Current V
FB
= 1V, V
COMP
= 1V 4 8.7 14 µA
Error Amplifier Output Sink Current V
FB
= 1.5V, V
COMP
= 1V 4 8.7 14 µA
Error Amplifier Clamp Voltage V
FB
= 1V 1.6 2.2 V
Undervoltage Lockout Threshold 1.65 1.85 V
Input Voltage Range ● 1.9 18 V
Switching Frequency 1.9V ≤ V
IN
≤ 18V ● 220 300 360 kHz
Synchronization Frequency Range 370 500 kHz
Maximum Duty Cycle ● 88 92 %
Current Limit Threshold ● 40 53 66 mV
Burst Mode Operation Current Limit 10 mV
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= V
DRV
= 2.5V, V
S/S
= V
IN
, COMP open, V
SENSE
= 0V unless otherwise noted.
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ELECTRICAL CHARACTERISTICS