Datasheet
LT1073
3
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 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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
REV
Reverse Battery Current (Note 5) 750 mA
I
LIM
Current Limit 220Ω Between I
LIM
and V
IN
400 mA
Current Limit Temperature Coefficient –0.3 %/°C
I
LEAK
Switch OFF Leakage Current Measured at SW1 Pin 1 10 µA
V
SW2
Maximum Excursion Below GND I
SW1
≤ 10µA, Switch Off –400 –350 mV
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.5V unless otherwise specified.
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 V
IN
, I
LIM
and SW1 pins are
grounded.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
Switch ON Voltage Step-Down Mode
(SW1 Pin Connected to V
IN
)
Maximum Switch Current vs R
LIM
I
SWITCH
(A)
0
V
CESAT
(V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4 0.6 0.8
1073 G01
1.0 1.2
V
IN
= 1.25V
V
IN
= 1.5V
V
IN
= 5V
V
IN
= 2V
V
IN
= 1V
V
IN
= 3V
I
SWITCH
(A)
0
SWITCH ON VOLTAGE (V)
0.6
1073 G02
0.2 0.4 0.8
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.1 0.3 0.5 0.7
R
LIM
(Ω)
10
SWITCH CURRENT (mA)
1200
1100
1000
900
800
700
600
500
400
300
200
100
100 1000
1073 G03
L = 82µH
V
IN
= 3V
V
IN
= 1.5V
FB Pin Bias Current vs
Temperature
SET Pin Bias Current vs
Temperature
“Gain Block” Gain
TEMPERATURE (°C)
–50
FB BIAS CURRENT (nA)
100
1073 G04
050
20
18
16
14
12
10
8
6
4
–25 25 75 125
TEMPERATURE (°C)
–50
SET PIN BIAS CURRENT (nA)
100
1073 G05
050
200
175
150
125
100
75
50
25
0
–25 25 75 125
TEMPERATURE (°C)
–50
GB GAIN (V/V)
100
1073 G06
050
1800
1600
1400
1200
1000
800
600
400
200
0
–25 25 75 125
V
IN
= 1.5V
R
L
= 100k