NCP1597BMNTXG ONSEMI [ON Semiconductor], NCP1597BMNTXG Datasheet - Page 2

• Manufacturer Part Number: NCP1597BMNTXG
• Description: 1 MHz, 2 A Synchronous Buck Regulator
• Manufacturer: ONSEMI [ON Semiconductor]

PIN DESCRIPTIONS
Pin No
9, 10
7, 8
EP
1
2
3
4
5
6
AGND
VCC
EN
FB
Symbol
AGND
PGND
NCP1597B
V
PAD
V
NC
EN
FB
LX
CCP
Vref
CC
Soft−Start
+
+
−
Logic input to enable the part. Logic high turns on the part and a logic low disables it. An internal pullup
forces the part into an enable state when no external bias is present on the pin.
Input supply pin for internal bias circuitry. A 0.1 mF ceramic bypass capacitor is preferred to connect to
this pin.
Power input for the power stage
Analog ground pin. Connect to thermal pad.
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.
No connection
The drains of the internal MOSFETs. The output inductor should be connected to these pins.
Power ground pins. Connect to thermal pad.
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.
Power Reset
gm
Hiccup
UVLO
THD
Figure 1. Block Diagram
BLOCK DIAGRAM
http://onsemi.com
+
2
−
+
PWM
OSC
Description
Control
Logic
CA
+
−
PMOS
M1
VCCP
LX
LX
PGND