ADP1173 Analog Devices, ADP1173 Datasheet - Page 3

• Manufacturer Part Number: ADP1173
• Description: Micropower DC-DC Converter
• Manufacturer: Analog Devices

CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP1173 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
REV. 0
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (V
SW1 Pin Voltage (V
SW2 Pin Voltage (V
Feedback Pin Voltage (ADP1173) . . . . . . . . . . . . . . . . . . . 5 V
Sense Pin Voltage (ADP1173, –3.3, –5, –12) . . . . . . . . . 36 V
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Maximum Switch Current . . . . . . . . . . . . . . . . . . . . . . . .1.5 A
Operating Temperature Range . . . . . . . . . . . . . 0 C to +70 C
Storage Temperature Range . . . . . . . . . . . . . –65 C to 150 C
Lead Temperature, (Soldering, 10 sec) . . . . . . . . . . . . +300 C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
Model
ADP1173AN
ADP1173AR
ADP1173AN-3.3
ADP1173AR-3.3
ADP1173AN-5
ADP1173AR-5
ADP1173AN-12
ADP1173AR-12
*N = Plastic DIP, SO = Small Outline Package.
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum
ratings for extended periods of time may affect device reliability.
ALKALINE
4X NICAD
CELLS
*L1 = COILTRONICS CTX100-4
OR
Figure 1. Step-Up or Step-Down Converter
+
470µF
7
IN
SET
GND
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V
SW1
SW2
I
LIM
ADP1173
ORDERING GUIDE
1
5
56
) . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
) . . . . . . . . . . . . . . . . . . –0.5 V to V
SW2
V
2
4
IN
SW1
100µH
AO
L1*
FB
Output
Voltage
ADJ
ADJ
3.3 V
3.3 V
5 V
5 V
12 V
12 V
3
6
8
+
470µF
470k
IRF7203
240
24k
75k
+
Package
Options*
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8
470µF
+5V
OUTPUT
AT 100mA
IN
–3–
Mnemonic
I
V
SW1
SW2
GND
AO
SET
FB/SENSE
LIM
IN
SW1
SW2
I
V
LIM
8-Lead Plastic DIP
IN
1
2
3
4
*FIXED VERSIONS
(Not to Scale)
ADP1173
TOP VIEW
N-8
PIN FUNCTION DESCRIPTIONS
For normal conditions this pin is connected to
V
should be connected between I
Limiting the switch current to 400 mA is
achieved by connecting a 220
Input Voltage.
Collector Node of Power Transistor.
For step-down configuration, connect to V
for step-up configuration, connect to an
inductor/diode.
Emitter Node of Power Transistor. For step-
down configuration, connect to inductor/
diode; for step-up configuration, connect to
ground. Do not allow this pin to drop more
than a diode drop below ground.
Ground.
Auxiliary Gain (GB) Output. The open
collector can sink 100 A.
Gain Amplifier Input. The amplifier has
positive input connected to the SET pin and
negative input is connected to 1.245 V
reference.
On the ADP1173 (adjustable) version this pin
is connected to the comparator input. On the
ADP1173-3.3, ADP1173-5 and ADP1173-12,
the pin goes directly to the internal application
resistor that sets the output voltage.
Function
PIN CONFIGURATIONS
IN
8
7
6
5
. When lower current is required, a resistor
SET
AO
FB (SENSE)*
GND
WARNING!
SW1
SW2
I
V
LIM
IN
8-Lead Plastic SO
1
2
3
4
*FIXED VERSIONS
(Not to Scale)
ADP1173
TOP VIEW
ADP1173
ESD SENSITIVE DEVICE
SO-8
LIM
resistor.
and V
8
7
6
5
SET
AO
GND
FB (SENSE)*
IN.
IN
;