3
LT1107
1107fa
LT1107C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch OFF ● 450 µA
f
OSC
Oscillator Frequency ● 50 63 88 kHz
DC Duty Cycle Step-Up Mode ● 62 69 78 %
Step-Down Mode, V
IN
= 12V ● 50 60 70 %
t
ON
Switch ON Time Step-Up Mode ● 8 11 13.5 µs
Step-Down Mode, V
IN
= 12V ● 6 9 12.0 µs
Reference Line Regulation 2V ≤ V
IN
≤ 5V ● 0.2 0.7 %/V
V
SAT
Switch Saturation Voltage, Step-Up Mode V
IN
= 3V, I
SW
= 650mA ● 0.5 0.65 V
Switch Saturation Voltage, Step-Down Mode V
IN
= 12V, I
SW
= 650mA ● 1.1 1.5 V
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating temperature range, V
IN
= 3V, – 55°C ≤ T
A
≤ 125°C, unless
otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.2V to 1.3V range.
Note 3: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed-output versions
will always be within the specified range.
Note 4: 100k resistor connected between a 5V source and the AO pin.
The ● denotes the specifications which apply over the full operating
temperature range, V
IN
= 3V, military or commercial version, T
A
= 25°C, unless otherwise noted.
The ● denotes the specifications which apply over the full operating temperature range, V
IN
= 3V, 0°C ≤ T
A
≤ 70°C, unless otherwise
noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Pin Bias Current LT1107, V
FB
= 0V ● 70 120 nA
Set Pin Bias Current V
SET
= V
REF
● 70 300 nA
V
OL
Gain Block Output Low I
SINK
= 300µA, V
SET
= 1V ● 0.15 0.4 V
Reference Line Regulation 5V ≤ V
IN
≤ 30V ● 0.02 0.075 %/V
A
V
Gain Block Gain R
L
= 100k (Note 4) ● 1000 6000 V/V
Current Limit 220Ω to I
LIM
to V
IN
400 mA
Current Limit Temperature Coefficient ● –0.3 %/°C
Switch OFF Leakage Current Measured at SW1 Pin, V
SW1
= 12V 1 10 µA
V
SW2
Maximum Excursion Below GND I
SW1
≤ 10µA, Switch OFF –400 –350 mV
LT1107M
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch OFF ● 500 µA
f
OSC
Oscillator Frequency ● 40 63 95 kHz
DC Duty Cycle Step-Up Mode ● 56 69 81 %
Step-Down Mode, V
IN
= 12V ● 45 60 73 %
t
ON
Switch ON Time Step-Up Mode ● 71115 µs
Step-Down Mode, V
IN
= 12V ● 5913 µs
Reference Line Regulation 2V ≤ V
IN
≤ 5V, 0°C ≤ T
A
≤ 125°C 0.2 0.4 %/V
2.4V ≤ V
IN
≤ 5V, T
A
= –55°C 0.8 %/V
V
SAT
Switch Saturation Voltage, Step-Up Mode 0°C ≤ T
A
≤ 125°C, I
SW
= 500mA 0.5 0.65 V
T
A
= –55°C, I
SW
= 400mA 0.5 0.65 V
Switch Saturation Voltage, Step-Down Mode V
IN
= 12V, I
SW
= 500mA
0°C ≤ T
A
≤ 125°C 1.5 V
T
A
= –55°C 2.0 V
