ncp1597 ON Semiconductor, ncp1597 Datasheet - Page 2

• Manufacturer Part Number: ncp1597
• Description: 1 Mhz, 2.0 A Synchronous Buck Regulator
• Manufacturer: ON Semiconductor

PIN DESCRIPTIONS
Pin No
EP
1
2
3
4
5
6
NC/EN
VCC
FB
NCP1597/A
Vref
Symbol
V
Soft−Start
GND
PAD
V
NC
EN
FB
LX
CCP
CC
+
+
−
Power Reset
gm
Hiccup
UVLO
Feedback input pin of the Error Amplifier. Connect a resistor divider from the converter’s output
voltage to this pin to set the converter’s output voltage.
Ground pin. Connect to thermal pad.
The drains of the internal MOSFETs. The output inductor should be connected to this pin.
Power input for the power stage
Input supply pin for internal bias circuitry. A 0.1 mF ceramic bypass capacitor is preferred to connect
to this pin.
No connection for NCP1597
Logic input to enable the part. Logic high to turn on the part and logic low to shut off the part.
For NCP1597A only
Exposed pad of the package provides both electrical contact to the ground and good thermal contact
to the PCB. This pad must be soldered to the PCB for proper operation.
THD
Figure 1. Block Diagram
BLOCK DIAGRAM
http://onsemi.com
+
2
−
+
PWM
OSC
Description
Control
Logic
CA
+
−
PMOS
M1
VCCP
LX
GND