Microchip NX9548 Handleiding


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4.5 V to 24 A Adaptive Constant On V, 8
Time (COT) Synchronous Buck Regulator
Features
Adaptive COT Control
Adjustable, Constant Switching Frequency
up to 1 MHz
Extremely Low- -MOSFETs RDSON N
Bus Voltage 4.5 V to 24 V
Selectable Diode Emulation Mode (PSM
Mode)
Current Limit, UVLO, OVP
Gate Resistor Provision for EMI Reduction
-40°C to +8C Ambient Temperature
-40°C to +150°C Junction Temperature
RoHS Compliant
5×5 mm Very Thin Profile QFN (VQFN)
Package
Applications
Ultramobile/Notebook PCs
Tablets/Slates
-Hand held Portable Instruments
ADSL Modem
Description
The NX9548 is a synchronous buck switching regulator
with 21 mΩ internal N-
channel MOSFETs, primarily
intended for portable (mobile) applications. The
NX9548 operates from 4.5 V to 24 V, and the output
voltage range is from 0.75 V, with output currents V to 5
as high as 8
A. It can be selected to operate in
synchronous mode, or non-
synchronous (diode
emulation or PSM) mode at light loads, to improve
efficiency.
Adaptive constant on time (COT) control provides
extremely fast transient response to line and load steps,
while at the same time providing near-constant
switching
frequency over a wide input voltage range.
The frequency is also externally adjustable.
The NX9548 features overcurrent protection (OCP),
feedback under-
voltage lockout (FB UVLO), and
overvoltage protection (OVP). It also includes an
integrated bootstrap Schottky diode, and provides low -
voltage (5 -V) gate
drive capability. In addition it
provides a Power Good indicator and has adaptive dead
time.
NX9548
July 2015 Rev. 1.2 www.microsemi.com 1
© 2015 Microsemi Corporation
4.5 V to 24 V, 8 A Adaptive Constant On Time (COT) Synchronous Buck Regulator
Typical Application Diagram
Figure 1 · Typical Application Diagram for Low Input Voltages-
Figure 2 · Typical Application Diagram for Wide Input Range
2
Pin Configuration and Pinout
Pin Conguration and Pinout
1
HG
GND
9
63 4 8
10 11 12 13
5 7
28
S1
2
14 15 16
2419 222117 2018 23
32 31 30 29 28 27 26 25
S1
S1
D2
D2
D2
D2
S2
S2
BST
D2
HDRV
NC
TON
VOUT
EN_MODE
D1
D1
FB
VCC
S2
S2
D1
S2
S2
PVCC
OCP
GND
PGOOD
D1
“Pin 33”
(GND)
“Pin 34”
(D1)
“Pin 35
(D2)
TOP VIEW
(5x5 MCM, VQFN – 32L)
NX9548
Part Marking:
Line 1: * MSC
Line 2: 9548
Line 3: Date / Lot Code
Figure 3 · Pinout
Note: All Pins and PADs are at the bottom of the chip. * is the pin one dot.
Ordering Information
Ambient
Temperature Type Package Part Number Packaging Type
-40°C to 8C RoHS Compliant
Pb-free
VQFN- 32L (MCM)
5 × 5 mm
NX9548ILQ Bulk
NX9548ILQ- TR Tape and Reel
3


Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: NX9548

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