Datasheet

2
LT1507
Input Voltage ........................................................... 16V
Boost Pin Voltage .................................................... 25V
Shutdown Pin Voltage ............................................... 7V
FB Pin Voltage (Adjustable Part)............................. 3.5V
FB Pin Current (Adjustable Part)............................. 1mA
Sense Voltage (Fixed 3.3V Part) ................................ 5V
Sync Pin Voltage ....................................................... 7V
Operating Ambient Temperature Range
LT1507C.................................................. 0°C to 70°C
LT1507I .............................................. –40°C to 85°C
Max Operating Junction Temperature................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
T
JMAX
= 125°C, θ
JA
= 80°C/W TO 120°C/ W (N)
T
JMAX
= 125°C, θ
JA
= 120°C/W TO 170°C/ W (S)
DEPENDING ON PC BOARD LAYOUT
1
2
3
4
8
7
6
5
TOP VIEW
V
C

FB/SENSE
GND
SYNC
BOOST
V
IN

V
SW

SHDN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1507CN8
LT1507CN8-3.3
LT1507CS8
LT1507CS8-3.3
LT1507IN8
LT1507IN8-3.3
LT1507IS8
LT1507IS8-3.3
S8 PART MARKING
ELECTRICAL CHARACTERISTICS
T
J
= 25°C, V
IN
= 5V, V
C
= 1.5V, boost open, switch open unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (Adjustable) 2.39 2.42 2.45 V
All Conditions ● 2.36 2.48 V
Sense Voltage (3.3V) 3.25 3.3 3.35 V
All Conditions ● 3.23 3.37 V
Sense Pin Resistance ● 4.0 6.6 9.5 kΩ
Reference Voltage Line Regulation 4.3V ≤ V
IN
≤ 15V ● 0.01 0.03 %/V
FB Input Bias Current ● 0.5 2 µA
Error Amplifier Voltage Gain (Note 8) (Note 1) 150 400
Error Amplifier Transconductance (Note 8) ∆I(V
C
) = ±10µA 1500 2000 2700 µmho
● 1100 3000 µmho
V
C
Pin to Switch Current
Transconductance 2 A/V
Error Amplifier Source Current V
FB
= 2.1V or V
SENSE
= 2.9V ● 150 225 320 µA
Error Amplifier Sink Current V
FB
= 2.7V or V
SENSE
= 3.7V 2 mA
V
C
Pin Switching Threshold Duty Cycle = 0 0.9 V
V
C
Pin High Clamp V
FB
= 2.1V or V
SENSE
= 2.9V 2.1 V
Switch Current Limit V
C
Open, V
FB
= 2.1V or V
SENSE
= 2.9V DC ≤ 50% ● 1.50 2 3 A
V
IN
≥ 5V, V
BOOST
= V
IN
+ 5V DC = 80% ● 1.35 3 A
Switch On Resistance (Note 6) I
SW
= 1.5A, V
BOOST
= V
IN
+ 5V 0.3 0.4 Ω
● 0.5 Ω
Maximum Switch Duty Cycle V
FB
= 2.1V or V
SENSE
= 2.9V 90 93 %
● 86 93 %
1507I
1507I3
1507
15073