Document Number: 33937
Rev. 6.0, 9/2009
Freescale Semiconductor
Advance Information
Three Phase Field Effect
Transistor Pre-driver
33937
33937A
The 33937 and 33937A are Field Effect Transistor (FET) pre-
drivers designed for three phase motor control and similar
applications. The 33937A has been specifically enhanced to
improve performance when driving very high current loads. The
integrated circuit (IC) uses SMARTMOS™ technology.
THREE-PHASE PRE-DRIVER
The IC contains three High Side FET pre-drivers and three Low
Side FET pre-drivers.Three external bootstrap capacitors provide
gate charge to the High Side FETs.
The IC interfaces to a MCU via six direct input control signals,
an SPI port for device setup and asynchronous reset, enable and
interrupt signals. Both 5.0 and 3.0 V logic level inputs are
accepted and 5.0 V logic level outputs are provided.
EK SUFFIX (Pb-FREE)
98ASA99334D
Features
54-PIN SOICW-EP
• Fully specified from 8.0 to 40 V covers 12 and 24 V automotive
systems
• Extended operating range from 6.0 to 58 V covers 12 and 42 V
systems
• Greater than 1.0 A gate drive capability with protection
• Protection against reverse charge injection from CGD and CGS
of external FETs
ORDERING INFORMATION
Temperature
Device
Package
Range (T )
A
MCZ33937EK/R2
MCZ33937AEK/R2
-40°C to 135°C
54 SOICW-EP
• Includes a charge pump to support full FET drive at low battery
voltages
• Deadtime is programmable via the SPI port
• Simultaneous output capability enabled via safe SPI command
• Pb-free packaging designated by suffix code EK
V
SYS
33937
VPUMP
PUMP
VSUP
PA_HS_G
PB_HS_G
PC_HS_G
VPWR
VLS
VDD
VSS
PA_HS_S
PB_HS_S
PC_HS_S
3
3
3
PX_HS
PX_LS
PHASEX
CS
PA_LS_G
PB_LS_G
PC_LS_G
MCU
SI
OR
DSP
SCLK
SO
PX_LS_S
RST
INT
EN1
EN2
AMP_P
AMP_N
AMP_OUT
R
SEN
GND
Figure 1. 33937 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
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