nx2158 Microsemi Corporation, nx2158 Datasheet - Page 4

• Manufacturer Part Number: nx2158
• Description: Pwm Boost Controller
• Manufacturer: Microsemi Corporation

PIN DESCRIPTIONS
Rev.1.2
12/30/09
PIN #
17
13,16
12
11
10
7
8
15
14
7
5
2
1
3
4
PIN SYMBOL
RT
VCC
ENBUS
FB
COMP
BST
OCP
SW
HDRV
PGND
AGND
LDRV
PGOOD
PAD
NC
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Voltage supply for the low side fet driver and internal logic circuit. A high
frequency 1uF ceramic capacitor must be connected from this pin to the GND
pin as close as possible.
Enable pin for the controller.
This pin is the error amplifier inverting input.
This pin is the output of the error amplifier and together with FB pin is used to
compensate the voltage control feedback loop. This pin is also used as a shut
down pin. When this pin is pulled below 0.3V, both drivers are turned off and
internal soft start is reset.
This pin supplies voltage to the high side driver. A high frequency
ceramic capacitor of 0.1 to 1 uF must be connected from this pin to ground.
across the Rdson of the low side MOSFET. Current limit point is this voltage
divided by the Rds-on.
This pin is used by driver circuit and also sensing the RDSON of NMOSFET.
PMOS MOSFET gate driver.
Power ground.
Analog ground
NMOSFET gate driver.
Oscillator's frequency can be set by using an external resistor from this pin to
GND.
Power good indicator.
PAD should be connected to ground.
Not used.
An internal current source is flown to the OCP resistor sets the OCP voltage
PIN DESCRIPTION
Analog Mixed Signal Group
Microsemi
NX2158
4