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PDF NCP5338 Data sheet ( Hoja de datos )

Número de pieza NCP5338
Descripción Integrated Driver and MOSFET
Fabricantes ON Semiconductor 
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NCP5338
Integrated Driver and
MOSFET
The NCP5338 integrates a MOSFET driver, highside MOSFET
and lowside MOSFET into a 6 mm x 6 mm 40pin QFN package.
The driver and MOSFETs have been optimized for highcurrent
DCDC buck power conversion applications. The NCP5338
integrated solution greatly reduces package parasitics and board space
compared to a discrete component solution.
Features
Optimized for High Frequency, High Conversion Ratio Operation
Capable of Switching Frequencies Up to 1.5 MHz
Internal Bootstrap Diode
Zero Current Detection
Undervoltage Lockout
Internal Thermal Warning / Thermal Shutdown
40 A Continuous Output Current Capability
These are PbFree Devices
5 V 1220 V
5V
ZCD Enable
Output
Disable
PWM
Thermal
Warning
THWN
VIN
VCIN
BOOT
ZCD_EN#
DISB#
PWM
CGND
PHASE
VSWH
PGND
Vout
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1 40
QFN40
MN SUFFIX
CASE 485AZ
MARKING
DIAGRAM
1
NCP5338
AWLYYWWG
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = PbFree Package
ORDERING INFORMATION
Device
Package
Shipping
NCP5338MNR2G QFN40 2500/Tape & Reel
(PbFree)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Figure 1. Application Schematic
© Semiconductor Components Industries, LLC, 2014
January, 2014 Rev. 2
1
Publication Order Number:
NCP5338/D

1 page




NCP5338 pdf
NCP5338
APPLICATIONS INFORMATION
Theory of Operation
The NCP5338 is an integrated driver and MOSFET
module designed for use in a synchronous buck converter
topology. A single PWM input signal is all that is required
to properly drive the highside and lowside MOSFETs.
LowSide Driver
The lowside driver is designed to drive a
groundreferenced low RDS(on) NChannel MOSFET. The
voltage rail for the lowside driver is internally connected to
VCIN and PGND.
HighSide Driver
The highside driver is designed to drive a floating low
RDS(on) Nchannel MOSFET. The gate voltage for the
high side driver is developed by a bootstrap circuit
referenced to Switch Node (VSWH) pin.
The bootstrap circuit is comprised of the internal diode
and an external bootstrap capacitor. When the NCP5338 is
starting up, the VSWH pin is at ground, so the bootstrap
capacitor will charge up to VCIN through the bootstrap
diode See Figure 1. When the PWM input goes high, the
highside driver will begin to turn on the highside
MOSFET using the stored charge of the bootstrap capacitor.
As the highside MOSFET turns on, the VSWH pin will
rise. When the highside MOSFET is fully on, the switch
node will be at 12 V, and the BST pin will be at 5 V plus the
charge of the bootstrap capacitor (approaching 17 V).
The bootstrap capacitor is recharged when the switch
node goes low during the next cycle.
Zero Current Detect
When ZCD_EN# is set high, the NCP5338 will operate in
normal PWM mode.
When ZCD_EN# is set low, zero current detect (ZCD)
will be enabled. If PWM goes high, GH will go high after the
nonoverlap delay. If PWM goes low, GL will go high after
the nonoverlap delay, and stay high for the duration of the
ZCD blanking timer. Once this timer has expired, VSWH
will be monitored for zero current detection, and will pull
GL low once detected. The threshold on VSWH to
determine zero current undergoes an auto-calibration cycle
every time DISB# is brought from low to high. This
auto-calibration cycle typically takes 28 ms to complete.
Safety Timer and Overlap Protection Circuit
It is very important that MOSFETs in a synchronous buck
regulator do not both conduct at the same time. Excessive
shootthrough or cross conduction can damage the
MOSFETs, and even a small amount of cross conduction
will cause a decrease in the power conversion efficiency.
The NCP5338 prevents cross conduction by monitoring
the status of the MOSFETs and applying the appropriate
amount of “deadtime” or the time between the turn off of
one MOSFET and the turn on of the other MOSFET.
When the PWM input pin goes high, the gate of the
lowside MOSFET (GL pin) will go low after a propagation
delay (tpdlGL). The time it takes for the lowside MOSFET
to turn off (tfGL) is dependent on the total charge on the
lowside MOSFET gate. The NCP5338 monitors the gate
voltage of both MOSFETs and the switchnode voltage to
determine the conduction status of the MOSFETs. Once the
lowside MOSFET is turned off an internal timer will delay
(tpdhGH) the turn on of the highside MOSFET.
Likewise, when the PWM input pin goes low, the gate of
the highside MOSFET (GH pin) will go low after the
propagation delay (tpdlGH). The time to turn off the
highside MOSFET (tfGH) is dependent on the total gate
charge of the highside MOSFET. A timer will be triggered
once the highside MOSFET has stopped conducting, to
delay (tpdhGL) the turn on of the lowside MOSFET.
Thermal Warning / Thermal Shutdown
When the temperature of the driver reaches 150°C, the
THWN pin will be pulled low indicating a thermal warning.
At this point, the part continues to function normally. When
the temperature drops below 135°C, the THWN will go
high.
If the driver temperature exceeds 180°C, the part will
enter thermal shutdown and turn off both MOSFETs. Once
the temperature falls below 155°C, the part will resume
normal operation. The THWN pin has a maximum current
capability of 30 mA.
Power Supply Decoupling
The NCP5338 can source and sink relatively large current
to the gate pins of the MOSFETs. In order to maintain a
constant and stable supply voltage (VCIN) a low ESR
capacitor should be placed near the power and ground pins.
A 1 mF to 4.7 mF multi layer ceramic capacitor (MLCC) is
usually sufficient.
Bootstrap Circuit
The bootstrap circuit uses a charge storage capacitor
(CBST) and the internal diode. The bootstrap capacitor must
have a voltage rating that is able to withstand twice the
maximum supply voltage. A minimum 50 V rating is
recommended. A bootstrap capacitance greater than 100 nF
and a minimum 50 V rating is recommended. A good quality
ceramic capacitor should be used.
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