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