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LT1073CS8 Datasheet(PDF) 4 Page - Analog Devices

Part # LT1073CS8
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
PDF  17 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT1073CS8 Datasheet(HTML) 4 Page - Analog Devices

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LT1073
4
Rev B
–
+
A1
A2
COMPARATOR
DRIVER
212mV
REFERENCE
OSCILLATOR
GAIN BLOCK/ERROR AMP
VIN
SET
A0
ILIM
SW1
Q1
SW2
FB
GND
1073 BD01
–
+
A1
A2
COMPARATOR
DRIVER
212mV
REFERENCE
OSCILLATOR
GAIN BLOCK/ERROR AMP
VIN
SET
A0
ILIM
SW1
Q1
SW2
GND
1073 BD02
R1
R2
940k
SENSE
LT1073-5: R1 = 40k
LT1073-12: R2 = 16.3k
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature
Recommended Minimum
Inductance Value
Guaranteed Minimum Output
Current at 5V vs VIN
TEMPERATURE (°C)
–50
100
1073 G07
0
50
150
140
130
120
110
100
90
80
70
60
50
–25
25
75
125
VIN = 1.5V
INPUT VOLTAGE (V)
1073 G08
300
250
200
150
100
50
0
1.0
2.0
3.0 3.5
1.5
2.5
4.0 4.5 5.0
RLIM = 0V
VIN (V)
1.0
1000
100
10
1.5
2.0
2.5
3.0
3.5
1073 G09
FOR VIN > 1.6V A
68 RESISTOR
MUST BE CONNECTED
BETWEEN ILIM AND VIN
PIN FUNCTIONS
BLOCK DIAGRAMS
ILIM (Pin 1): Connect this pin to VIN for normal use. Where
lower current limit is desired, connect a resistor between
ILIM and VIN. A 220Ω resistor will limit the switch current
to approximately 400mA.
VIN (Pin 2): Input Supply Voltage
SW1 (Pin 3): Collector of Power Transistor. For step-up
mode connect to inductor/diode. For step-down mode
connect to VIN.
SW2 (Pin 4): Emitter of Power Transistor. For step-up
mode connect to ground. For step-down mode connect
to inductor/diode. This pin must never be allowed to go
more than a Schottky diode drop below ground.
GND (Pin 5): Ground.
AO (Pin 6): Auxiliary Gain Block (GB) Output. Open col-
lector, can sink 100µA.
SET (Pin 7): GB Input. GB is an op amp with positive
input connected to SET pin and negative input connected
to 212mV reference.
FB/SENSE(Pin8):OntheLT1073(adjustable)thispingoes
to the comparator input. On the LT1073-5 and LT1073-12,
this pin goes to the internal application resistor that sets
output voltage.
LT1073
LT1073-5 and LT1073-12



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