Datasheet

3
LT1307/LT1307B
1307fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle 25°C, 0°C8084%
70°C76%
Switch Current Limit (Note 4) DC = 40% ● 0.6 1.25 A
DC = 75% 0.5 A
Switch V
CESAT
I
SW
= 500mA (25°C, 0°C) 295 350 mV
I
SW
= 500mA (70°C) 400 mV
Burst Mode Operation Switch Current Limit L = 10µH 100 mA
(LT1307 Only) L = 22µH50mA
Shutdown Pin Current V
SHDN
= V
IN
● 2.5 4.0 µA
V
SHDN
= 0V ● –1.5 –2.5 µA
LBI Threshold Voltage ● 190 200 210 mV
LBO Output Low I
SINK
= 10µA ● 0.1 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V ● 0.01 0.1 µA
LBI Input Bias Current (Note 5) V
LBI
= 150mV ● 525nA
Low-Battery Detector Gain 1MΩ Load (25°C, 0°C) 1000 3000 V/V
1MΩ Load (70°C) 500 V/V
Switch Leakage Current V
SW
= 5V ● 0.01 3 µA
Reverse Battery Current (Note 6) 750 mA
Commercial Grade T
A
= – 20°C, V
IN
= 1.1V, V
SHDN
= V
IN
, unless otherwise noted (Note 2).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current V
FB
= 1.3V, Not Switching (LT1307) 50 100 µA
V
FB
= 1.3V, Not Switching (LT1307B) 1.1 1.6 mA
V
SHDN
= 0V 1 3 µA
V
FB
Feedback Voltage 1.195 1.22 1.245 V
g
m
Error Amp Transconductance ∆I = 5µA253565µmhos
A
V
Error Amp Voltage Gain 35 100 V/V
f
OSC
Switching Frequency 500 600 750 kHz
Maximum Duty Cycle 80 84 %
Switch V
CESAT
I
SW
= 500mA, V
IN
= 1.2V 250 350 mV
Shutdown Pin Current V
SHDN
= V
IN
2.5 4.0 µA
V
SHDN
= 0V –1.5 –2.5 µA
LBI Threshold Voltage 186 200 210 mV
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
= 1.1V, V
SHDN
= V
IN
, LT1307/LT1307B unless otherwise noted.
ELECTRICAL CHARACTERISTICS