Datasheet

2
LT1614
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
V
IN
, SHDN, LBO Voltage ......................................... 12V
SW Voltage ............................................... –0.4V to 30V
NFB Voltage ............................................................ –3V
V
C
Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ V
LBI
≤ 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature...........................................125°C
Operating Temperature Range
LT1614C................................................. 0°C to 70°C
LT1614I ............................................. –40°C to 85°C
Extended Commercial
Temperature Range (Note 2) .................. –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current 12mA
V
SHDN
= 0V 5 10 µA
Feedback Voltage ● –1.21 –1.24 –1.27 V
NFB Pin Bias Current (Note 3) V
NFB
= –1.24V ● –2.5 –4.5 –7 µA
Reference Line Regulation 1V ≤ V
IN
≤ 2V 0.6 1.1 %/V
2V ≤ V
IN
≤ 6V 0.3 0.8 %/V
Minimum Input Voltage 0.92 1 V
Maximum Input Voltage ● 6V
Error Amp Transconductance ∆I = 5µA16µmhos
Error Amp Voltage Gain 100 V/V
Switching Frequency ● 500 600 750 kHz
Maximum Duty Cycle 73 80 %
● 70 80 %
Switch Current Limit (Note 4) 0.75 1.2 A
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 160°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1614CS8
LT1614IS8
S8 PART MARKING
1614
1614I
ORDER PART
NUMBER
LT1614CMS8
LT1614IMS8
MS8 PART MARKING
LTID
LTJB
1
2
3
4
NFB
V
C
SHDN
GND
8
7
6
5
LBO
LBI
V
IN
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 120°C/W
1
2
3
4
8
7
6
5
TOP VIEW
LBO
LBI
V
IN
SW
NFB
V
C
SHDN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Commercial Grade 0°C to 70°C. V
IN
= 1.5V, V
SHDN
= V
IN
unless
otherwise noted.
(Note 1)