ADP1108 Analog Devices, ADP1108 Datasheet - Page 3

• Manufacturer Part Number: ADP1108
• Description: Micropower DC-DC Converter Adjustable and Fixed 3.3 V/ 5 V/ 12 V
• 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 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.
REV. 0
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (V
SW1 Pin Voltage (V
SW2 Pin Voltage (V
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-
Model
ADP1108AN
ADP1108AR
ADP1108AN-3.3
ADP1108AR-3.3
ADP1108AN-5
ADP1108AR-5
ADP1108AN-12
ADP1108AR-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 rating
conditions for extended periods may affect device reliability.
IN
) . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
SW1
SW2
ORDERING GUIDE
) . . . . . . . . . . . . . . . . . . . . . . . . +50 V
) . . . . . . . . . . . . . . . . . . –0.5 V to V
Output Voltage
ADJ
ADJ
3.3 V
3.3 V
5 V
5 V
12 V
12 V
Package*
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8
IN
–3–
Mnemonic
I
V
SW1
SW2
GND
AO
SET
FB/SENSE
LIM
IN
SW1
SW2
I
V
LIM
8-Lead Plastic DIP
IN
* FIXED VERSIONS
1
2
3
4
(Not to Scale)
ADP1108
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 of Power Transistor. For step-down
configuration, connect to V
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 A.
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.
Function
IN
PIN CONFIGURATIONS
8
7
6
5
. When lower current is required, a resistor
FB (SENSE)*
SET
AO
GND
SW1
SW2
WARNING!
I
V
LIM
IN
8-Lead SOIC
1
2
3
4
* FIXED VERSIONS
(Not to Scale)
ADP1108
(SO-8)
TOP VIEW
IN
ADP1108
ESD SENSITIVE DEVICE
. For step-up
LIM
resistor.
8
7
6
5
and V
FB (SENSE)*
SET
AO
GND
IN
.