ADP1173
ABSOLUTE MAXIMUM RATINGS*
PIN CONFIGURATIONS
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V
SW1 Pin Voltage (VSW1) . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
SW2 Pin Voltage (VSW2) . . . . . . . . . . . . . . . . . . –0.5 V to VIN
Feedback Pin Voltage (ADP1173) . . . . . . . . . . . . . . . . . . . 5 V
Sense Pin Voltage (ADP1173, –3.3, –5, –12) . . . . . . . . . 36 V
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Maximum Switch Current . . . . . . . . . . . . . . . . . . . . . . . .1.5 A
Operating Temperature Range . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature, (Soldering, 10 sec) . . . . . . . . . . . .+300°C
N-8
SO-8
8-Lead Plastic SO
8-Lead Plastic DIP
I
1
2
3
4
8
7
6
5
FB (SENSE)*
SET
I
1
2
3
4
8
7
6
5
FB (SENSE)*
SET
LIM
LIM
ADP1173
ADP1173
V
V
IN
IN
TOP VIEW
(Not to Scale)
TOP VIEW
(Not to Scale)
SW1
SW2
AO
SW1
SW2
AO
GND
GND
*FIXED VERSIONS
*FIXED VERSIONS
*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
ratings for extended periods of time may affect device reliability.
PIN FUNCTION DESCRIPTIONS
Function
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.
ORDERING GUIDE
Output
Voltage
Package
Options*
Model
ADP1173AN
ADP1173AR
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
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.
ADP1173AN-3.3
ADP1173AR-3.3
ADP1173AN-5
ADP1173AR-5
ADP1173AN-12
ADP1173AR-12
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 drop more
than a diode drop below ground.
SO-8
*N = Plastic DIP, SO = Small Outline Package.
L1*
100µH
IRF7203
GND
AO
Ground.
+5V
OUTPUT
AT 100mA
+
Auxiliary Gain (GB) Output. The open
56Ω
470µF
collector can sink 100 µA.
470kΩ
2
1
75kΩ
I
V
IN
LIM
SET
Gain Amplifier Input. The amplifier has
positive input connected to the SET pin and
negative input is connected to 1.245 V
reference.
3
6
SW1
4X NICAD
OR
ALKALINE
CELLS
ADP1173
+
AO
FB
470µF
7
SET
8
GND SW2
+
4
240Ω
24kΩ
5
470µF
FB/SENSE
On the ADP1173 (adjustable) version this pin
is connected to the comparator input. On the
ADP1173-3.3, ADP1173-5 and ADP1173-12,
the pin goes directly to the internal application
resistor that sets the output voltage.
*L1 = COILTRONICS CTX100-4
Figure 1. Step-Up or Step-Down Converter
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 ADP1173 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–
5秒后页面跳转
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