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ADP1108-12 View Datasheet(PDF) - Analog Devices

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ADP1108-12 Datasheet PDF : 12 Pages
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ADP1108
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
ADP1108AN
ADP1108AR
ADP1108AN-3.3
ADP1108AR-3.3
ADP1108AN-5
ADP1108AR-5
ADP1108AN-12
ADP1108AR-12
ADJ
ADJ
3.3 V
3.3 V
5V
5V
12 V
12 V
*N = Plastic DIP, SO = Small Outline Package.
Package*
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8
PIN CONFIGURATIONS
8-Lead Plastic DIP
(N-8)
8-Lead SOIC
(SO-8)
ILIM 1
8 FB (SENSE)*
VIN 2 ADP1108 7 SET
TOP VIEW
SW1 3 (Not to Scale) 6 AO
SW2 4
5 GND
* FIXED VERSIONS
ILIM 1
8 FB (SENSE)*
VIN 2 ADP1108 7 SET
TOP VIEW
SW1 3 (Not to Scale) 6 AO
SW2 4
5 GND
* FIXED VERSIONS
PIN FUNCTION DESCRIPTIONS
Mnemonic Function
ILIM
VIN
SW1
SW2
GND
AO
SET
FB/SENSE
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 resistor.
Input Voltage.
Collector of Power Transistor. For step-down
configuration, connect to VIN. For step-up
configuration, connect to an inductor/diode.
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.
Ground.
Auxiliary Gain (GB) Output. The open
collector can sink 100 µA.
Gain Amplifier Input. The amplifier has
positive input connected to SET pin and
negative input connected to 1.245 V reference.
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.
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.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
 

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