LT1111_15 Datasheet, PDF (3/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1111
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C.V_IN = 3V, Military or Commercial Version
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
I_FB
Feedback Pin Bias Current
LT1111, V_FB = 0V
q
70
120
nA
I_SET
Set Pin Bias Current
V_OL
Gain Block Output Low
Reference Line Regulation
A_V
Gain Block Gain
I_LIM
Current Limit
Current Limit Temperature Coefficient
V_SET = V_REF
I_SINK = 300µA, V_SET = 1.00V
5V ≤ V_IN ≤ 30V
2V ≤ V_IN ≤ 5V
R_L = 100k (Note 4)
220Ω from I_LIM to V_IN
q
70
300
nA
q
0.15
0.4
V
q
0.02 0.075
%/V
0.20 0.400
%/V
q 1000 6000
V/ V
400
mA
q
– 0.3
%/°C
Switch OFF Leakage Current
Maximum Excursion Below GND
Measured at SW1 Pin, V_SW1 = 12V
I_SW1≤ 10µA, Switch OFF
1
10
µA
– 400 – 350
mV
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A = 25°C.
V_IN = 3V, 0°C ≤ T_A ≤ 70°C unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
LT1111C
MIN TYP MAX
UNITS
I_Q
Quiescent Current
f_OSC
Oscillator Frequency
DC
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch OFF
Full Load
q 300
450
µA
q
54
72
95
kH
q
43
50
59
%
q
24
34
50
%
t_ON
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
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
q 5.0
7
9.0
µs
q 3.3
5
7.8
µs
q
0.2
0.7
%/V
q
0.5
0.65
V
q
1.1
1.50
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 1.20V to 1.30V 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 A0 pin.
1111fd
3