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107312 View Datasheet(PDF) - Linear Technology

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107312 Datasheet PDF : 16 Pages
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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
220Between ILIM and VIN
Current Limit Temperature Coefficient
750
mA
400
mA
–0.3
%/°C
ILEAK
VSW2
Switch OFF Leakage Current
Maximum Excursion Below GND
Measured at SW1 Pin
ISW1 10µA, Switch Off
1
10
µA
–400 –350
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
–50 –25
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
–50 –25
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 ()
1000
1073 G03
“Gain Block” Gain
1800
1600
VIN = 1.5V
RL = 100k
1400
1200
1000
800
600
400
200
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1073 G06
3
 

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