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LT1073_1 Datasheet, PDF (3/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V | |||
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LT1073
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IREV
Reverse Battery Current
(Note 5)
ILIM
Current Limit
220⦠Between ILIM and VIN
Current Limit Temperature Coefficient
750
mA
400
mA
â0.3
%/°C
ILEAK
VSW2
Switch OFF Leakage Current
Maximum Excursion Below GND
Measured at SW1 Pin
ISW1 ⤠10µA, Switch Off
1
10
µA
â400 â350
mV
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 point
of the comparator fall within the 202mV to 222mV range.
Note 4: 100k resistor connected between a 5V source and the AO pin.
Note 5: The LT1073 is guaranteed to withstand continuous application of
1.6V applied to the GND and SW2 pins while VIN, ILIM and SW1 pins are
grounded.
Note 3: This specification guarantees that the output voltage of the fixed
versions will always fall within the specified range. The waveform at the
SENSE pin will exhibit a sawtooth shape due to the comparator hysteresis.
TYPICAL PERFOR A CE CHARACTERISTICS
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
1.2
VIN = 1.5V
1.0
VIN = 1.25V
0.8
VIN = 1V
0.6
VIN = 5V
0.4
VIN = 3V
VIN = 2V
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2
ISWITCH (A)
1073 G01
FB Pin Bias Current vs
Temperature
20
18
16
14
12
10
8
6
4
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
1073 G04
Switch ON Voltage Step-Down Mode
(SW1 Pin Connected to VIN)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
ISWITCH (A)
1073 G02
SET Pin Bias Current vs
Temperature
200
175
150
125
100
75
50
25
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
1073 G05
Maximum Switch Current vs RLIM
1200
1100
L = 82µH
1000
VIN = 3V
900
800
700
600
500
VIN = 1.5V
400
300
200
100
10
100
RLIM (â¦)
1000
1073 G03
âGain Blockâ Gain
1800
1600
VIN = 1.5V
RL = 100k
1400
1200
1000
800
600
400
200
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
1073 G06
3
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