4
LT1307/LT1307B
1307fa
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Industrial Grade –40°C to 85°C. V
IN
= 1.1V, V
SHDN
= V
IN
, LT1307/LT1307B unless otherwise noted.
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 1.8 mA
V
SHDN
= 0V ● 13µA
V
FB
Feedback Voltage ● 1.195 1.22 1.245 V
I
B
FB Pin Bias Current (Note 3) V
FB
= V
REF
● 10 27 100 nA
Reference Line Regulation 1V ≤ V
IN
≤ 2V (–40°C) 0.6 1.1 %/V
1V ≤ V
IN
≤ 2V (85°C) 3.2 %/V
2V ≤ V
IN
≤ 5V ● 0.3 0.8 %/V
Minimum Input Voltage –40°C 1.1 1.2 V
85°C 0.8 1.0 V
Input Voltage Range ● 5V
g
m
Error Amp Transconductance ∆I = 5µA ● 25 35 65 µmhos
A
V
Error Amp Voltage Gain –40°C35V/V
85°C30V/V
f
OSC
Switching Frequency ● 500 600 750 kHz
Maximum Duty Cycle –40°C8084%
85°C7580%
Switch Current Limit (Note 4) DC = 40% ● 0.6 1.25 A
DC = 75% 0.5 A
Switch V
CESAT
I
SW
= 500mA, V
IN
= 1.2V (–40°C) 250 350 mV
I
SW
= 500mA (85°C) 330 400 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 ● 186 200 210 mV
LBO Output Low I
SINK
= 10µA ● 0.1 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V ● 0.1 0.3 µA
LBI Input Bias Current (Note 5) V
LBI
= 150mV ● 530nA
Low-Battery Detector Gain 1MΩ Load (–40°C) 1000 6000 V/V
1MΩ Load (85°C) 400 V/V
Switch Leakage Current V
SW
= 5V ● 0.01 3 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specifications for commercial (C) grade devices are guaranteed
but not tested at –20°C. MS8 package devices are designed for and
intended to meet commercial temperature range specifications but are not
tested at – 20°C or 0°C.
Note 3: Bias current flows into FB pin.
Note 4: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator.
Note 5: Bias current flows out of LBI pin.
Note 6: The LT1307/LT1307B will withstand continuous application of
1.6V applied to the GND pin while V
IN
and SW are grounded.
