LT1107_15 Datasheet, PDF (3/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1107
ELECTRICAL CHARACTERISTICS The q 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.
SYMBOL
V_OL
A_V
V_SW2
PARAMETER
Feedback Pin Bias Current
Set Pin Bias Current
Gain Block Output Low
Reference Line Regulation
Gain Block Gain
Current Limit
Current Limit Temperature Coefficient
Switch OFF Leakage Current
Maximum Excursion Below GND
CONDITIONS
LT1107, V_FB = 0V
V_SET = V_REF
I_SINK = 300µA, V_SET = 1V
5V ≤ V_IN ≤ 30V
R_L = 100k (Note 4)
220Ω to I_LIM to V_IN
Measured at SW1 Pin, V_SW1 = 12V
I_SW1 ≤ 10µA, Switch OFF
MIN TYP MAX
q
70 120
q
70 300
q
0.15 0.4
q
0.02 0.075
q 1000 6000
400
q
– 0.3
1
10
– 400 – 350
UNITS
nA
nA
V
%/V
V/V
mA
%/°C
µA
mV
The q denotes the specifications which apply over the full operating temperature range, V_IN = 3V, – 55°C ≤ T_A ≤ 125°C, unless
otherwise noted.
SYMBOL
I_Q
f_OSC
DC
PARAMETER
Quiescent Current
Oscillator Frequency
Duty Cycle
t_ON
Switch ON Time
Reference Line Regulation
V_SAT
Switch Saturation Voltage, Step-Up Mode
Switch Saturation Voltage, Step-Down Mode
CONDITIONS
Switch OFF
Step-Up Mode
Step-Down Mode, V_IN = 12V
Step-Up Mode
Step-Down Mode, V_IN = 12V
2V ≤ V_IN ≤ 5V, 0°C ≤ T_A ≤ 125°C
2.4V ≤ V_IN ≤ 5V, T_A = – 55°C
0°C ≤ T_A ≤ 125°C, I_SW = 500mA
T_A = – 55°C, I_SW = 400mA
V_IN = 12V, I_SW = 500mA
0°C ≤ T_A ≤ 125°C
T_A = – 55°C
LT1107M
MIN TYP MAX
q
500
q
40
63
95
q
56
69
81
q
45
60
73
q
7
q
5
11
15
9
13
0.2 0.4
0.8
0.5 0.65
0.5 0.65
1.5
2.0
UNITS
µA
kHz
%
%
µs
µs
%/V
%/V
V
V
V
V
The q 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
LT1107C
MIN TYP MAX
UNITS
I_Q
Quiescent Current
Switch OFF
f_OSC
Oscillator Frequency
DC
Duty Cycle
Step-Up Mode
Step-Down Mode, V_IN = 12V
t_ON
Switch ON Time
Step-Up Mode
Step-Down Mode, V_IN = 12V
Reference Line Regulation
2V ≤ V_IN ≤ 5V
V_SAT
Switch Saturation Voltage, Step-Up Mode
V_IN = 3V, I_SW = 650mA
Switch Saturation Voltage, Step-Down Mode V_IN = 12V, I_SW = 650mA
q
450
µA
q
50
63
88
kHz
q
62
69
78
%
q
50
60
70
%
q
8
11 13.5
µs
q
6
9 12.0
µs
q
0.2 0.7
%/V
q
0.5 0.65
V
q
1.1 1.5
V
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.
1107fa
3