ADP1111
PIN DESCRIPTIONS
Function
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V
SW1 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
SW2 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VIN
Feedback Pin Voltage (ADP1111) . . . . . . . . . . . . . . . . . 5.5 V
Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range
ADP1111A . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C
Mnemonic
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 Node of Power Transistor. For step-
down configuration, connect to VIN. For step-up
configuration, connect to an inductor/diode.
TYPICAL APPLICATION
SW2
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 go more than a diode
drop below ground.
SUMIDA
CD54-220K
22µH
MBRS120T3
5V
100mA
3V
INPUT
GND
AO
Ground.
I
V
IN
LIM
Auxiliary Gain (GB) Output. The open collector
SW1
can sink 300 µA. It can be left open if unused.
10µF
(OPTIONAL)
ADP1111AR-5
SENSE
33µF
SET
Gain Amplifier Input. The amplifier’s positive
input is connected to SET pin and its negative
input is connected to the 1.25 V reference. It can
be left open if unused.
GND SW2
FB/SENSE
On the ADP1111 (adjustable) version this pin
is connected to the comparator input. On the
ADP1111-3.3, ADP1111-5 and ADP1111-12,
the pin goes directly to the internal application
resistor that sets output voltage.
Figure 1. 3 V to 5 V Step-Up Converter
ORDERING GUIDE
Output Voltage
Model
Package*
PIN CONFIGURATIONS
ADP1111AN
ADP1111AR
ADJ
ADJ
3.3 V
3.3 V
5 V
5 V
12 V
12 V
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
8-Lead Plastic DIP
8-Lead SOIC
(SO-8)
(N-8)
ADP1111AN-3.3
ADP1111AR-3.3
ADP1111AN-5
ADP1111AR-5
ADP1111AN-12
ADP1111AR-12
I
1
2
3
4
8
7
6
5
I
1
2
3
4
8
FB (SENSE)*
FB (SENSE)*
LIM
LIM
ADP1111
TOP VIEW
(Not to Scale)
ADP1111
TOP VIEW
(Not to Scale)
7
6
5
SET
A0
SET
A0
V
V
IN
IN
SW1
SW2
SW1
SW2
SO-8
GND
GND
*N = Plastic DIP, SO = Small Outline Package.
*FIXED VERSIONS
*FIXED VERSIONS
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 ADP1111 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–