LT1317 Datasheet, PDF (2/16 Pages) Linear Technology – Micropower, 600kHz PWM DC/DC Converters

LT1317/LT1317B
ABSOLUTE AXI U RATI GS (Note 1)
V_IN, LBO Voltage ..................................................... 12V
SW Voltage ............................................... – 0.4V to 30V
FB Voltage .................................................... V_IN + 0.3V
V_C Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ V_LBI ≤ 1V
SHDN Voltage ............................................................ 6V
Junction Temperature .......................................... 125°C
Operating Temperature Range
Commercial ........................................... 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V_C 1
FB 2
SHDN 3
GND 4
8 LBO
7 LBI
6 V_IN
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T_JMAX = 125°C, θ_JA = 160°C/W
ORDER PART
NUMBER
LT1317CMS8
LT1317BCMS8
MS8 PART MARKING
LTHA
LTHB
TOP VIEW
V_C 1
FB 2
SHDN 3
GND 4
8 LBO
7 LBI
6 V_IN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
T_JMAX = 125°C, θ_JA = 120°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1317CS8
LT1317BCS8
LT1317IS8
LT1317BIS8
S8 PART MARKING
1317
1317B
1317I
1317BI
ELECTRICAL CHARACTERISTICS
Commercial Grade V_IN = 2V, V_SHDN = 2V, T_A = 25°C, unless otherwise noted.
SYMBOL PARAMETER
I_Q
Quiescent Current
V_FB
Feedback Voltage
I_B
FB Pin Bias Current (Note 2)
Input Voltage Range
g_m
Error Amp Transconductance
A_V
Error Amp Voltage Gain
Maximum Duty Cycle
Switch Current Limit (Note 3)
Burst Mode Operation Switch Current Limit
f_OSC
Switching Frequency
CONDITIONS
MIN
Not Switching, V_SHDN = 2V (LT1317) q
V_SHDN = 0V (LT1317/LT1317B)
q
V_SHDN = 2V, Switching (LT1317B)
V_SHDN = 2V, Switching (LT1317B)
q
1.22
q 1.20
q
q 1.5
∆I = 5µA
q 70
V_IN = 2.5V, Duty Cycle = 30%
V_IN = 2.5V, Duty Cycle = 30%
Duty Cycle = 30% (LT1317)
q 80
710
q 660
q 520
2
TYP
MAX UNITS
100
160
µA
25
40
µA
4.8
6.5
mA
7.5
mA
1.24
1.26
V
1.24
1.26
V
12
60
nA
12
V
140
240 µmhos
700
V/V
85
%
800
1300
mA
1350
mA
275
mA
620
720
kHz