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PDF PX3515 Datasheet ( Hoja de datos )

Número de pieza PX3515
Descripción Sychronous Rectified Buck MOSFET Driver IC
Fabricantes Primarion 
Logotipo Primarion Logotipo

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PX3515 Hoja de datos, Descripción, Manual
An Infineon Technologies Company
Sychronous Rectified Buck MOSFET Driver IC
Datasheet
PX3515
Applications
Core power regulation for Intel® and AMD®
μprocessors
High current DC-DC converters
POL power converters for memory, DSP, FPGA, ASIC
Features
Dual MOSFET driver for synchronous rectified bridge
converters
Adjustable high-side and low-side MOSFET gate drive
voltages for optimal efficiency
- High-side VCC (7V to 12V)
- Low-side PVCC (5V to 12V)
Integrated bootstrap diode for reduced part count
Adaptive gate drive control prevents cross-conduction
Fast rise and fall times supports switching rates of up
to 2MHz
Capable of sinking more than 4A peak current for low
switching losses
Three-state PWM input for output stage shutdown
VCC under-voltage protection
Lead-free (RoHS compliant) SOIC and DFN packages
Description
The PX3515 is a dual high speed driver designed to drive a
wide range of high-side and low-side power N-channel
MOSFETs in synchronous rectified buck converters. When
combined with the Primarion PX35XX family of Digital Multi-
phase Controllers or PX75XX Digital Point of Load (Di-
POLTM) Controllers and N-channel MOSFETs, the PX3515
forms a complete core-voltage regulator solution for
advanced micro and graphics processors as well as point-
of-load applications.
The PX3515 provides the capability of driving the high-side
gate and low-side gate with independent drive voltages
over a range from 7V to 12V (high-side VCC) and 5V to
12V (low-side PVCC). This provides the flexibility necessary
to optimize applications involving trade-offs between gate
charge and conduction losses.
Adaptive zero shoot-through protection is integrated into the
IC which prevents both upper and lower MOSFETs from
conducting simultaneously and to minimize dead time. The
PX3515 has small propagation delay from input to output
with fast rise and fall times.
The PX3515 drivers also feature a three-state PWM input
which, when used together with Primarion’s Digital
Controllers, eliminates the need for Schottky diodes that are
often used in systems to protect the load from reversed
output voltage events.
PX3515 DFN Package
Ordering Information
Part Number
PX3515BDDG
Ambient
0 to 85°C
Package
10-lead DFN
10-pin DFN (TOP VIEW)
UGATE
BOOT
N/C
PWM
GND
1
2
3
4
5
GND
10 PHASE
9 PVCC
8 N/C
7 VCC
6 LGATE
.
PD-3515-001A
Copyright © 2008, Primarion, Inc.
Contents subject to change without notice
26-Aug-08

1 page

PX3515 pdf
Notes:
4. Guaranteed by design, verified during characterization
5. Incremental resistance VBOOT – VUG = 4.3V @ ISRC = 2A
6. Incremental resistance VVCC – VBG = 4.4V @ ISRC = 2A
PX3515
Table 4. Pin Function Description
Pin # Name
Description
1 UGATE Upper gate drive output. Connect to the gate of high-side power N-channel MOSFET
Floating bootstrap supply pin for the upper gate drive. Connect the bootstrap capacitor between this pin
2 BOOT and the PHASE pin. The bootstrap capacitor provides the charge to turn on the upper MOSFET. See the
Internal Bootstrap Device section herein for guidance in choosing the capacitor value.
3 N/C
No connection
4 PWM
5 GND
The PWM signal is the control input for the driver and is to be connected to the PWM output of the
controller. The PWM signal can enter three distinct states during operation. See the 3-state PWM input
section herein for further details.
Bias and reference ground. All signals are referenced to this node. It is also the power ground return of
the driver.
6 LGATE Lower gate drive output. Connect to the gate of the low-side power N-channel MOSFET
7 VCC
This pin supplies power to the upper gate , Its operating range is +6V to +12V. Place a high quality low
ESR ceramic capacitor from this pin to GND.
8 N/C
No connection
9
PVCC
This pin supplies power to the lower gate , Its operating range is +6.7V to +12V. Place a high quality low
ESR ceramic capacitor from this pin to GND.
10
PHASE
Connect this pin to the source of the upper MOSFET and the drain of the lower MOSFET. This pin provides
a return path for the upper gate drive.
Die paddle Connect pad to the power circuit board power ground plane (GND), use thermal vias
Timing Diagram
PWM
1.4V< PWM <2.2V
UGATE
LGATE
tD(OFF)_LG
tD(OFF)_UG
tPDTS_UG
tr_UG
tD(ON)_UG
tf_LG
tD(ON)_LS
tf_HS
tSSHD_LG
tr_LG
PHASE
tSSHD_UG
tPDTS_LG
PD-3515-001A
5

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