NCP5351DR2G Datasheet, PDF (1/14 Pages) ON Semiconductor – 4 A Synchronous Buck Power MOSFET Driver

NCP5351
4 A Synchronous Buck
Power MOSFET Driver
The NCP5351 is a dual MOSFET gate driver optimized to drive the
gates of both high−side and low−side Power MOSFETs in a
Synchronous Buck converter. The NCP5351 is an excellent
companion to multiphase controllers that do not have integrated gate
drivers, such as ON Semiconductor’s CS5323, CS5305 or CS5307.
This architecture provides a power supply designer the flexibility to
locate the gate drivers close to the MOSFETs.
The 4.0 A drive capability makes the NCP5351 ideal for minimizing
switching losses in MOSFETs with large input capacitance. Optimized
internal, adaptive nonoverlap circuitry further reduces switching
losses by preventing simultaneous conduction of both MOSFETs.
The floating top driver design can accommodate MOSFET drain
voltages as high as 25 V. Both gate outputs can be driven low, and
supply current reduced to less than 25 mA, by applying a low logic
level to the Enable (EN) pin. An undervoltage lockout function
ensures that both driver outputs are low when the supply voltage is
low, and a thermal shutdown function provides the IC with
overtemperature protection.
The NCP5351 is pin−to−pin compatible with the SC1205 and is
available in a standard SO−8 package and thermally enhanced
DFN10.
Features
• 4.0 A Peak Drive Current
• Rise and Fall Times < 15 ns Typical into 6000 pF
• Propagation Delay from Inputs to Outputs < 20 ns
• Adaptive Nonoverlap Time Optimized for Large Power MOSFETs
• Floating Top Driver Accommodates Applications Up to 25 V
• Undervoltage Lockout to Prevent Switching when the Input
Voltage is Low
• Thermal Shutdown Protection Against Overtemperature
• < 1.0 mA Quiescent Current − Enabled
• 25 mA Quiescent Current − Disabled
• Internal TG to DRN Pulldown Resistor Prevents HV Supply−Induced
Turn On of High−Side MOSFET
• Pb−Free Package is Available
http://onsemi.com
8
1
SO−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
5351
ALYW
G
1
DFN10
1 ₅₃₅₁
MN SUFFIX
ALYWG
CASE 485C
1
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
SO−8
1
8
DRN
PGND
TG
BG
BST
V_S
CO
EN
1
DRN
TG
N/C
BST
CO
DFN10
10
GND
BG
N/C
V_S
EN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
1
February, 2010 − Rev. 13
Publication Order Number:
NCP5351/D