Datasheet

2
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
sn1767 1767fas
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Input Voltage .......................................................... 25V
BOOST Pin Above SW ............................................ 20V
Max BOOST Pin Voltage .......................................... 35V
SHDN Pin ............................................................... 25V
FB Pin Voltage .......................................................... 6V
FB Pin Current ....................................................... 1mA
ELECTRICAL CHARACTERISTICS
(Note 1)
PARAMETER CONDITION MIN TYP MAX UNITS
Maximum Switch Current Limit T
A
= 0°C to 125°C 1.5 2 3 A
T
A
= < 0°C 1.3 3 A
Oscillator Frequency 3.3V < V
IN
< 25V 1.1 1.25 1.4 MHz
● 1.1 1.5 MHz
Switch On Voltage Drop I
SW
= –1.5A, 0°C ≤ T
A
≤ 125°C and –1.3A, T
A
< 0°C 330 400 mV
● 500 mV
V
IN
Undervoltage Lockout (Note 3) ● 2.47 2.6 2.73 V
V
IN
Supply Current V
FB
= V
NOM
+ 17% ● 1 1.3 mA
Shutdown Supply Current V
SHDN
= 0V, V
IN
= 25V, V
SW
= 0V 6 20 µA
● 45 µA
Feedback Voltage 3V < V
IN
< 25V, 0.4V < V
C
< 0.9V LT1767 (Adj) 1.182 1.2 1.218 V
(Note 3) ● 1.176 1.224 V
LT1767-1.8 ● 1.764 1.8 1.836 V
LT1767-2.5 ● 2.45 2.5 2.55 V
LT1767-3.3 ● 3.234 3.3 3.366 V
LT1767-5 ● 4.9 5 5.1 V
FB Input Current LT1767 (Adj) ● –0.25 –0.5 µA
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 15V, V
C
= 0.8V, Boost = V
IN
+ 5V, SHDN, SYNC and switch open unless otherwise noted.
SYNC Pin Current .................................................. 1mA
Operating Junction Temperature Range (Note 2)
LT1767E .......................................... –40°C to 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART NUMBER
1
2
3
4
BOOST
V
IN
SW
GND
8
7
6
5
SYNC
V
C
FB
SHDN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 110°C/W
LTLS
LTWG
LTWD
LTWE
LTWF
LT1767EMS8
LT1767EMS8-1.8
LT1767EMS8-2.5
LT1767EMS8-3.3
LT1767EMS8-5
GROUND PIN CONNECTED
TO LARGE COPPER AREA
MS8 PART MARKING
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 40°C/W
LT1767EMS8E
LT1767EMS8E-1.8
LT1767EMS8E-2.5
LT1767EMS8E-3.3
LT1767EMS8E-5
EXPOSED GND PAD
CONNECTED TO LARGE
COPPER AREA ON PCB
MS8E PART MARKING
LTZG
LTZH
LTZJ
LTZK
LTZL
1
2
3
4
BOOST
V
IN
SW
GND
8
7
6
5
SYNC
V
C
FB
SHDN
TOP VIEW
MS8E PACKAGE
8-LEAD PLASTIC MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.