NCP1589L
http://onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin No. Symbol Description
1 BOOT 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 BOOT pin). Connect a capacitor (C
BOOT
) between this pin and
the LX pin. Typical values for C
BOOT
range from 0.1 mF to 1 mF. Ensure that C
BOOT
is placed near the IC.
2 LX Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
MOSFET. Also used for low side MOSFET R
DS(on)
current detection and diode emulation.
3 UG Top gate MOSFET driver pin. Connect this pin to the gate of the top N−channel MOSFET.
4 LG Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−channel MOSFET. Also used to
set the overcurrent limit.
5 GND IC ground reference. All control circuits are referenced to this pin. Connect to FLAG.
6 VCC
Supply rail for the internal circuitry. Operating supply range is 4.5 V to 13.2 V. Decouple with a 1 mF capacitor
to GND. Ensure that this decoupling capacitor is placed near the IC. Also low−side MOSFET drive voltage.
7 COMP/DIS Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM com-
parator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. Pull this
pin low for disable.
8 FB This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to com-
pensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or directly
to V
out
.
9 VORPM Output voltage information for RPM threshold
10 PGOOD Power Good output. Pulled Low if VFB is outside ±10% of 0.8 V V
ref
.
ABSOLUTE MAXIMUM RATINGS
Pin Name Symbol V
MAX
V
MIN
Main Supply Voltage Input VCC 15 V −0.3 V
Bootstrap Supply Voltage Input BOOT 35 V wrt/GND
40 V < 100 ns
15 V wrt/LX
−0.3 V
−0.3 V
−0.3 V
Switching Node (Bootstrap Supply Return) LX 35 V
40 V for < 100 ns
−5 V
−10 V for < 200 ns
High−Side Driver Output (Top Gate) UG 30 V wrt/GND
15 V wrt/LX
40 V for < 100 ns
−0.3 V wrt/LX
−5 V for < 200 ns
Low−Side Driver Output (Bottom Gate) LG 15 V −0.3 V
−5 V for < 200 ns
Feedback, VORPM FB, VORPM 6.0 V −0.3 V
COMP/DIS COMP/DIS 5.5 V −0.3 V
PGOOD PGOOD 7 V −0.3 V
MAXIMUM RATINGS
Rating Symbol Value Unit
Thermal Resistance, Junction−to−Ambient
R
q
JA
165 °C/W
Thermal Resistance, Junction−to−Case
R
q
JC
45 °C/W
Operating Junction Temperature Range T
J
0 to 150 °C
Operating Ambient Temperature Range T
A
0 to 95 °C
Storage Temperature Range T
stg
−55 to +150 °C
Moisture Sensitivity Level MSL 1 −
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
