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LT1073 Datasheet(PDF) 4 Page - Linear Technology

Part # LT1073
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1073 Datasheet(HTML) 4 Page - Linear Technology

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LT1073
4
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Temperature
Recommended Minimum
Inductance Value
Guaranteed Minimum Output
Current at 5V vs VIN
PI FU CTIO S
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 collec-
tor, can sink 100
µA.
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 (Pin 8): On the LT1073 (adjustable) this pin
goes to the comparator input. On the LT1073-5 and
LT1073-12, this pin goes to the internal application resis-
tor that sets output voltage.
BLOCK DIAGRA S
LT1073
LT1073-5 and LT1073-12
TEMPERATURE (
°C)
–50
100
1073 G07
050
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
Ω RESISTOR
MUST BE CONNECTED
BETWEEN ILIM AND VIN
–
+
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



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