LT1111 Datasheet, PDF (3/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1111
ELECTRICAL CHARACTERISTICS V_IN = 3V, Military or Commercial Version
SYMBOL PARAMETER
Reference Line Regulation
A_V
Gain Block Gain
I_LIM
Current Limit
Current Limit Temperature Coefficient
Switch OFF Leakage Current
Maximum Excursion Below GND
CONDITIONS
5V ≤ V_IN ≤ 30V
2V ≤ V_IN ≤ 5V
R_L = 100k (Note 3)
220Ω from I_LIM to V_IN
Measured at SW1 Pin, V_SW1 = 12V
I_SW1≤ 10µA, Switch OFF
MIN TYP MAX
q
0.02 0.075
0.20 0.400
q 1000 6000
400
q
– 0.3
1
10
– 400 – 350
UNITS
%/ V
%/ V
V/ V
mA
%/°C
µA
mV
V_IN = 3V, – 55°C ≤ T_A ≤ 125°C unless otherwise noted.
SYMBOL
I_Q
f_OSC
DC
t_ON
PARAMETER
Quiescent Current
Oscillator Frequency
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch ON Time: Step-Up Mode
Step-Down Mode
Reference Line Regulation
V_SAT
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
CONDITIONS
Switch OFF
Full Load
I_LIM Tied to V_IN
V_OUT = 5V, V_IN = 12V
2V ≤ V_IN ≤ 5V, 25°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,
0°C ≤ T_A ≤ 125°C
I_SW = 500mA T_A = – 55°C
LT1111M
MIN TYP MAX
q
300
500
q
45
72
100
q
40
50
62
q
20
55
q
5
q
3
7
11
9
0.2
0.4
0.8
0.5
0.65
1.5
2.0
UNITS
µA
kHz
%
%
µs
µs
%/ V
%/ V
V
V
V
V_IN = 3V, 0°C ≤ T_A ≤ 70°C unless otherwise noted.
SYMBOL
I_Q
f_OSC
DC
t_ON
V_SAT
PARAMETER
Quiescent Current
Oscillator Frequency
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch ON Time: Step-Up Mode
Step-Down Mode
Reference Line Regulation
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
CONDITIONS
Switch OFF
Full Load
I_LIM Tied to V_IN
V_OUT = 5V, V_IN = 12V
2V ≤ V_IN ≤ 5V
V_IN = 3V, I_SW = 650mA
V_IN = 12V, I_SW = 650mA
LT1111C
MIN TYP MAX
q 300
450
q
54
72
95
q
43
50
59
q
24
34
50
q 5.0
7
9.0
q 3.3
5
7.8
q
0.2
0.7
q
0.5
0.65
q
1.1
1.50
UNITS
µA
kH
%
%
µs
µs
%/V
V
V
The q denotes specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
Note 2: 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 3: 100k resistor connected between a 5V source and the A0 pin.
3