ncp3163 ON Semiconductor, ncp3163 Datasheet - Page 2

• Manufacturer Part Number: ncp3163
• Description: 3.4 A, Stepup/down/inverting 50300 Khz Switching Regulator
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
Exposed
SOIC16
5,12,13
14,15
10,11
Pad
16
1
2
3
4
6
7
8
9
Shutdown
10,11,12,13
Exposed
DFN18
6,7,8,9
Pad
15
16
17
18
14
1
3
4
5
2
Voltage Feedback 1
Voltage Feedback 2
Timing Capacitor
Voltage Feedback 2
Voltage Feedback 1
V
I
LVI Output
PKsense
Timing Capacitor
Switch Collector
CC
Bootstrap Input
Drive Collector
Switch Emitter
R
Exposed Pad
R
No Connect
PIN NAME
LVI Output
C
DT
Gnd
I
SC
pk
T
GND
V
Sense
CC
8
7
6
5
4
3
2
1
Figure 2. Representative Block Diagram
LVI
V
0.25 V
CC
Oscillator
Thermal
+
+
-
This pin will sink current when FB1 and FB2 are less than the LVI threshold (V
Connecting this pin to a resistor divider off of the output will regulate the application
according to the V
Connecting this pin directly to the output will regulate the device to 5.05 V.
Ground pin for all internal circuits and power switch.
Connect a capacitor to this pin to set the frequency. The addition of a parallel resist-
or will decrease the maximum duty cycle and increase the frequency.
Power pin for the IC.
When (V
pulse basis.
Voltage driver collector
Internal switch transistor collector
Internal switch transistor emitter
Connect this pin to V
series resistor and capacitor can be utilized to improve the converter efficiency.
These pins have no connection.
The exposed pad beneath the package must be connected to GND (pin 4). Addi-
tionally, using proper layout techniques, the exposed pad can greatly enhance the
power dissipation capabilities of the NCP3163.
-
+
1.125 V
http://onsemi.com
45 k
Current
1.25 V
+
+
-
Limit
CC
(Bottom View)
−V
Comparator
IPKsense
2
Feedback
15 k
V
2.0 mA
CC
out
Latch
R
S
CC
Q
design equation in Figure 22.
) > 250 mV the circuit resets the output driver on a pulse by
V
for operation at low V
CC
7.0 V
Q1
60
Q2
DESCRIPTION
10
12
13
14
15
16
11
9
Bootstrap Input
Driver Collector
Switch Collector
CC
Switch Emitter
levels. For some topologies, a
+
-
= Sink Only
Positive True Logic
th
).