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ADP1108 Datasheet(PDF) 3 Page - Analog Devices

Part No. ADP1108
Description  Micropower DC-DC Converter Adjustable and Fixed 3.3 V, 5 V, 12 V
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1108 Datasheet(HTML) 3 Page - Analog Devices

 
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ADP1108
–3–
REV. 0
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
SW1 Pin Voltage (VSW1) . . . . . . . . . . . . . . . . . . . . . . . . +50 V
SW2 Pin Voltage (VSW2) . . . . . . . . . . . . . . . . . . –0.5 V to VIN
Feedback Pin Voltage (ADP1108) . . . . . . . . . . . . . . . . +5.5 V
Sense Pin Voltage (ADP1108, 3.3, 5, 12) . . . . . . . . . . . +36 V
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Maximum Switch Current . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A
Operating Temperature Range . . . . . . . . . . . . . 0
°C to 170°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-
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 rating
conditions for extended periods may affect device reliability.
ORDERING GUIDE
Model
Output Voltage
Package*
ADP1108AN
ADJ
N-8
ADP1108AR
ADJ
SO-8
ADP1108AN-3.3
3.3 V
N-8
ADP1108AR-3.3
3.3 V
SO-8
ADP1108AN-5
5 V
N-8
ADP1108AR-5
5 V
SO-8
ADP1108AN-12
12 V
N-8
ADP1108AR-12
12 V
SO-8
*N = Plastic DIP, SO = Small Outline Package.
PIN CONFIGURATIONS
8-Lead Plastic DIP
8-Lead SOIC
(N-8)
(SO-8)
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADP1108
ILIM
VIN
SW1
SW2
FB (SENSE)*
SET
AO
GND
* FIXED VERSIONS
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADP1108
ILIM
VIN
SW1
SW2
FB (SENSE)*
SET
AO
GND
* FIXED VERSIONS
PIN FUNCTION DESCRIPTIONS
Mnemonic
Function
ILIM
For normal conditions this pin is connected to
VIN. When lower current is required, a resistor
should be connected between ILIM and VIN.
Limiting the switch current to 400 mA is
achieved by connecting a 220
Ω resistor.
VIN
Input Voltage.
SW1
Collector of Power Transistor. For step-down
configuration, connect to VIN. For step-up
configuration, connect to an inductor/diode.
SW2
Emitter of Power Transistor. For step-down
configuration, connect to inductor/diode. For
step-up configuration, connect to ground. Do
not allow this pin to go more than a diode
drop below ground.
GND
Ground.
AO
Auxiliary Gain (GB) Output. The open
collector can sink 100
µA.
SET
Gain Amplifier Input. The amplifier has
positive input connected to SET pin and
negative input connected to 1.245 V reference.
FB/SENSE
On the ADP1108 (adjustable) version this pin
is connected to the comparator input. On the
ADP1108-3.3, ADP1108-5 and ADP1108-12,
the pin goes directly to the internal application
resistor that set output voltage.
WARNING!
ESD SENSITIVE DEVICE
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 ADP1108 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.


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