ncp5383 ON Semiconductor, ncp5383 Datasheet - Page 4

• Manufacturer Part Number: ncp5383
• Description: Two Phase Buck Controller With Integrated Gate Drivers And Avp
• Manufacturer: ON Semiconductor

PIN DESCRIPTIONS
Pin No.
19, 17
20, 16
21, 15
22, 14
23, 13
10
12
18
24
1
2
3
4
5
6
7
8
9
Symbol
COMP
AGND
PGND
CSxN
R
V
V
SWN
CSx
BST
V
I
V
SS
EN
BG
TG
PG
OSC
LIM
DRP
CCP
CC
FB
A resistance from this pin to ground programs the oscillator frequency according to f
Also, this pin supplies a trimmed output voltage of 2.00 V so it may be used to form a voltage divider at the I
pin to set the over current shutdown threshold as shown in the Applications Schematics.
Over current shutdown threshold. To program the shutdown threshold, connect this pin to the R
resistor divider as shown in the Applications Schematics. To disable the over current feature connect this pin
directly to the R
generated by the R
Power for the internal control circuits.
Power supply return for the analog circuits that control output voltage.
A capacitor from this pin to ground programs the soft-start time.
Output of the error amplifier and input to the inverting pin of the PWM comparators.
Voltage feedback pin and error amplifier inverting input. Connect a resistor from this pin to V
this resistor and the amount of current from the droop resistor (R
droop (AVP) during load.
Current signal output for Adaptive Voltage Positioning (AVP). The offset of this pin above the no-load set-point
is proportional to the output current. Connect a resistor from this pin to V
into the feedback resistor (R
Non-inverting input to current sense amplifier #x, x = 1, 2
Inverting input to current sense amplifier #x, x = 1, 2 (Tie to V
When this pin is pulled High the controller is enabled. When it is pulled Low the controller will be disabled.
Either an open-collector output (with a pull-up resistor) or a logic gate (CMOS or totem-pole output) may be
used to drive this pin. A Low to High transition on this pin will induce soft start. If the Enable function is not
required, this pin should be tied directly to V
Power for the gate drivers
Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N-channel MOSFET.:
Phase #x, x = 1, 2
Ground reference for the bottom gate drivers
Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
MOSFET. : Phase #x, x = 1, 2
Top gate MOSFET driver pin. Connect this pin to the gate of the top N-channel MOSFET. : : Phase #x, x = 1,2
Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the desired
input voltage to this pin (cathode connected to BST pin). Connect a capacitor (CBST) between this pin and the
PHASE pin. Typical values for CBST range from 0.1 mF to 1 mF. Ensure that CBST is placed near the IC.:
Phase #x, x = 1, 2.
PowerGood output. Open drain type output with internal delays. The output is latched low if V
or 75% of V
FB
.
OSC
OSC
pin. To guarantee correct operation, this pin should only be connected to the voltage
pin – do not connect this pin to any externally generated voltages.
FB
) that will result in output voltage droop. Leave this pin open for no AVP.
http://onsemi.com
NCP5383
4
FB
.
Description
CORE
DRP
)
) will set the amount of output voltage
FB
to set the amount of AVP current
SW
= 1 / (R
CORE
fb
OSC
OSC
is 125% of V
. The value of
w 100 pF).
pin via a
LIM
FB