LT1308A/ LT1308B
W W W
U
(Note 1)
ABSOLUTE AXI U RATI GS
V , SHDN, LBO Voltage ......................................... 10V Operating Temperature Range
IN
SW Voltage ............................................... –0.4V to 36V
FB Voltage ....................................................... V + 1V
V Voltage ................................................................ 2V
C
Commercial ............................................ 0°C to 70°C
Extended Commerial (Note 2) ........... –40°C to 85°C
Industrial ........................................... –40°C to 85°C
IN
LBI Voltage ................................................. –0.1V to 1V Storage Temperature Range ................ –65°C to 150°C
Current into FB Pin .............................................. ±1mA Lead Temperature (Soldering, 10 sec)................. 300°C
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
LBO
LBI
V
1
2
3
4
5
6
7
14
13
12
11
10
9
C
TOP VIEW
FB
SHDN
GND
GND
GND
GND
V
1
2
3
4
8
7
6
5
LBO
LBI
LT1308ACF
LT1308BCF
C
LT1308ACS8
LT1308AIS8
LT1308BCS8
LT1308BIS8
V
IN
FB
SHDN
GND
V
IN
V
IN
SW
SW
SW
SW
8
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
F PACKAGE
14-LEAD PLASTIC TSSOP
1308B
1308BI
1308A
1308AI
TJMAX = 125°C, θJA = 80°C/W
(Note 6)
T
JMAX = 125°C, θJA = 80°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
Commercial Grade 0°C to 70°C. V = 1.1V, VSHDN = V , unless otherwise noted.
IN
IN
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Q
Quiescent Current
Not Switching, LT1308A
Switching, LT1308B
140
2.5
0.01
240
4
1
µA
mA
µA
V
= 0V (LT1308A/LT1308B)
SHDN
V
Feedback Voltage
●
●
●
1.20
1.22
27
1.24
80
V
FB
I
B
FB Pin Bias Current
Reference Line Regulation
(Note 3)
1.1V ≤ V ≤ 2V
nA
0.03
0.01
0.4
0.2
%/V
%/V
IN
2V ≤ V ≤ 10V
IN
Minimum Input Voltage
0.92
60
1
V
µmhos
V/V
kHz
g
m
Error Amp Transconductance
Error Amp Voltage Gain
Switching Frequency
∆I = 5µA
A
V
100
600
90
f
V
IN
= 1.2V
●
●
500
82
2
700
4.5
OSC
Maximum Duty Cycle
Switch Current Limit
%
Duty Cyle = 30% (Note 4)
= 2A (25°C, 0°C), V = 1.5V
3
A
Switch V
I
SW
290
330
350
400
mV
mV
CESAT
IN
I
SW
= 2A (70°C), V = 1.5V
IN
Burst Mode Operation Switch Current Limit
(LT1308A)
V
IN
= 2.5V, Circuit of Figure 1
400
mA
2
Linear [ Linear ]
