ncp3064b ON Semiconductor, ncp3064b Datasheet - Page 2

• Manufacturer Part Number: ncp3064b
• Description: 1.5 A, Step-up/down/ Inverting Switching Regulator With On/off Function
• Manufacturer: ON Semiconductor

PIN DESCRIPTION
Pin No.
Comparator Inverting Input
Timing Capacitor
Switch Collector
1
2
3
4
5
6
7
8
Switch Emitter
GND
Timing Capacitor
Switch Collector
Switch Emitter
Inverting Input
Comparator
Pin Name
I
ON/OFF
pk
Figure 2. Pin Connections
I
pk
ON/OFF
GND
V
Sense
Sense
CC
V
CC
SOIC−8/PDIP−8
2
3
4
1
(Top View)
8
7
6
5
Internal Darlington switch collector
Internal Darlington switch emitter
Timing Capacitor Oscillator Input, Timing Capacitor
Ground pin for all internal circuits
Inverting input pin of internal comparator
Voltage supply
Peak Current Sense Input to monitor the voltage drop across an external resistor to limit the peak
current through the circuit
ON/OFF Pin. Pulling this pin to High level turns the device in Operating. To switch into mode with
low current consumption this pin has to be in Low level or floating.
Comparator
8
7
6
5
ON/OFF
Bias
−
+
0.2 V
ON/OFF
I
V
Comparator
Inverting
Input
pk
CC
Figure 4. Block Diagram
Sense
http://onsemi.com
Comparator
R
S
S
R
+
Q
−
Q
2
Reference
Regulator
Oscillator
TSD
1.25 V
Timing Capacitor
Switch Collector
NOTE:
Description
Switch Emitter
EP Flag must be tied to GND Pin 4 on PCB
GND
Figure 3. Pin Connections
CT
Ç Ç
Ç Ç
Ç Ç
Ç Ç
1
2
3
4
(Top View)
EP Flag
Switch Collector
Switch Emitter
Timing Capacitor
GND
DFN8
Ç
Ç
Ç
Ç
ON/OFF
I
V
Comparator
Inverting
Input
pk
CC
Sense