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PDF ( 数据手册 , 数据表 ) 33394

零件编号 33394
描述 Switch Mode Power Supply
制造商 Freescale Semiconductor
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33394 数据手册, 描述, 功能
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Freescale Semiconductor,OIrdnercth.is document from Analog Marketing
Rev. 2.5, 11/2002
Switch Mode Power Supply with
Multiple Linear Regulators and
High Speed CAN Transceiver
The 33394 is a multi–output power supply integrated circuit with high
speed CAN transceiver. The IC incorporates a switching pre–regulator
operating over a wide input voltage range from +4.0V to +26.5V (with
transients up to 45V).
The switching regulator has an internal 3.0A current limit and runs in both
buck mode or boost mode to always supply a pre–regulated output followed
by Low Drop Out (LDO) regulators: VDDH / 5.0V @ 400mA; VDD3_3 / 3.3V
@ 120mA; VDDL / 2.6V (User scalable between 3.3V – 1.25V) @ 400mA
typically, using an external NPN pass transistor. The Keep Alive regulator
VKAM (scalable) @ 50mA; FLASH memory programming voltage VPP /
5.0V or 3.3V @ 150mA; three sensor supply outputs VREF(1,2,3) / 5.0V
(tracking VDDH) @ 100mA each; and a switched battery output (VSEN) to
supply 125mA clamped to 17V.
Additional features include Active Reset circuitry watching VDDH,
VDD3_3, VDDL and VKAM, user selectable Hardware Reset Timer (HRT),
Power Sequencing circuitry guarantees the core supply voltages never
exceed their limits or polarities during system power up and power down.
A high speed CAN transceiver physical layer interfaces between the
microcontroller CMOS outputs and differential bus lines. The CAN driver is
short circuit protected and tolerant of loss of battery or ground conditions.
33394 is designed specifically to meet the needs of modules, which use
the MPC565 microcontroller, though it will also support others from the
MPC5XX family of Motorola microcontrollers.
Features:
Wide operating input voltage range: +4.0V to +26.5V (+45V transient).
Provides all regulated voltages for MPC5XX MCUs and other ECU’s
logic and analog functions.
Accurate power up/down sequencing.
Provides necessary MCU support monitoring and fail–safe support.
Provides three 5.0 V buffer supplies for internal & external (short–circuit
protected) sensors.
Includes step–down/step–up switching regulator to provide supply
voltages during different battery conditions.
Interfaces Directly to Standard 5.0V I/O for CMOS Microprocessors by
means of Serial Peripheral Interface.
PIN CONNECTIONS
GND
SW2G
BOOT
SW1
SW1
SW1
VBAT
VBAT
KA_VBAT
VIGN
VKAM
1
QFN
TOP VIEW
VBAT
VBAT
KA_VBAT
VIGN
/SLEEP
HRT
CANH
CANL
GND
CANTXD
CANRXD
/PORESET
/HRESET
/PRERESET
VDDL_FB
VKAM
VKAM_FB
VSEN
REGON
WAKEUP
VREF1
VPP_EN
VPP
VDD3_3
VDD3_3FB
VDDL_X
VDDL_B
VDDL_FB
/PRERESET
/HRESET
/PORESET
CANRXD
CANTXD
1
HSOP
SW1
SW1
SW1
BOOT
SW2G
GND
INV
VCOMP
VPRE
VPRE_S
VDDH
VREF2
VREF3
DO
SCLK
DI
CS
/SLEEP
HRT
CANH
CANL
GND
33394
MULTI–OUTPUT
POWER SUPPLY
SEMICONDUCTOR
TECHNICAL DATA
44–Lead HSOP
DH SUFFIX
CASE 1291
44–Lead QFN
FC SUFFIX
CASE 1310
(BOTTOM VIEW)
54–Lead SOICW–EP
DWB SUFFIX
CASE 1377
PIN CONNECTIONS
GND
CANL
CANH
HRT
/SLEEP
N/C
CS
DI
SCLK
DO
N/C
VREF3
VREF2
VDDH
VPRE_S
VPRE
VCOMP
INV
GND
SW2G
BOOT
N/C
SW1
SW1
SW1
SW1
SW1
1
SOICW
CANTXD
CANRXD
/PORESET
/HRESET
/PRERESET
N/C
VDDL_FB
VDDL_B
VDDL_X
VDD3_3FB
VDD3_3
VPP
VPP_EN
VREF1
WAKEUP
REGON
VSEN
VKAM_FB
VKAM
VIGN
N/C
KA_VBAT
VBAT
VBAT
VBAT
VBAT
VBAT
This document contains information on a new product. Specifications
and information herein are subject to change without notice.
© Motorola, Inc. 2002
MOTOROLA ANALOG
For More Information On This Product,
INTEGRATED CIRCUGIToDtEoV:ICwEwDwAT.fAreescale.com
1







33394 pdf, 数据表
Freescale Se3m33ic94onductor, Inc.
3. ELECTRICAL CHARACTERISTICS (–40°C TA +125°C; +4.0 V VBAT +26.5 V using the 33394 typical application
circuit – see Figure 1, unless otherwise noted.)
Characteristic
Symbol
Min.
Typ.
Max.
Unit
DC CHARACTERISTICS:
BUCK CONVERTER
Buck Converter Output Voltage, VBAT = 7.5V to 18V; ILOAD=500mA
VPRE
5.4 5.6 5.8 V
Buck to Boost Mode Threshold Voltage
(Note 1)
VBATthd
6.7
V
Boost to Buck Mode Threshold Voltage
(Note 1)
VBATthu
7.2
V
N–channel power MOSFET SW1
SW1 Drain–Source Breakdown Voltage
(Note 1)
SW1 Continuous Drain Current
SW1 Drain–Source Current Limit
SW1 Drain–Source On–Resistance; ID = 1.0 A, VBAT = 9.0 V
Error Amplifier (Design Information Only)
BVDSS
IDSW1
IscSW1
RDS(on)
50
–2.75
–2.5
–3.0
V
A
–3.5 A
300 m
Input Offset Voltage
DC Open Loop Gain
Unity Gain Bandwidth
(Note 1)
(Note 1)
(Note 1)
VOS
AVOL
BW
20 mV
80 dB
1.5 MHz
Output Voltage Swing — High Level
Output Voltage Swing — Low Level
Output Source Current
Output Sink Current
Ramp Generator
(Note 1)
(Note 1)
(Note 1)
(Note 1)
VOH
VOL
IOUT
IOUT
4.2 V
0.4 V
1.0 mA
200 µA
Sawtooth Peak Voltage
Sawtooth Peak–to–Peak Voltage
BOOST CONVERTER
External Power MOSFET Gate Drive SW2G
(Note 1)
(Note 1)
VOSC
VOSCp–p
3.5 V
3.0 V
Boost Converter Output Voltage, VBAT = 4.5 V to 6.0 V (Note 1)
VPRE
5.9 6.0 6.6 V
SW2G Output Voltage, Power MOSFET On
SW2G Source Continuous Current
SW2G Sink Continuous Current
AC CHARACTERISTICS:
BUCK CONVERTER
Oscillator Frequency
(Note 1)
(Note 1)
Vg
Isource
Isink
Freq
VPRE
TBD
200 300 400
V
mA
mA
180 200 220 kHz
SW1 Switch Turn–ON Time
SW1 Switch Turn–OFF Time
SW2G Switch Turn–ON Time, Cgate = pF
SW2G Switch Turn–OFF Time, Cgate = pF
OFF Time
Duty cycle
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
tT–ON
tT–OFF
tT–ON
tT–OFF
tOFF
d
TBD
TBD
TBD
TBD
1.25
75
ns
ns
ns
ns
µs
%
NOTE:
1. Guaranteed by design but not production tested.
For More Information On This Product,
8 Go to: wwwMO.fTrOeeRsOcLAalAeN.cAoLmOG INTEGRATED CIRCUIT DEVICE DATA







33394 equivalent, schematic
Freescale Se3m33ic94onductor, Inc.
4. FUNCTIONAL DESCRIPTION
The 33394 is an integrated buck regulator/linear supply
specifically designed to supply power to the Motorola
MPC55x/MPC56x microprocessors. A detailed functional
description of the Buck Regulator, Linear Regulators, Power
Up/Down Sequences, Thermal Shutdown Protection, Can
Transceiver Reset Functions and Reverse Battery Function
are given below. Block diagram of the 33394 is given in Figure
1. The 33394 is packaged in a 44 pin HSOP, 54 pin SOICW
and the 44 pin QFN.
4.1. Input Power Source (VBAT, KA_VBAT & VIGN)
The VBAT and KA_VBAT pins are the input power source
for the 33394. The VBAT pins must be externally protected
from vehicle level transients greater than +45 V and reverse
battery. See typical application diagram in Figure 1. The VBAT
pins directly supply the pre–regulator switching power supply.
All power to the linear regulators (except VKAM in the power
down mode) is supplied from VBAT through the switching
regulator. VKAM power is supplied through VBAT input pins
and switching regulator when the 33394 is awake. When the
microprocessor is in a power down mode (no VDDH or VDDL
supply), the current requirement on VKAM falls to less than 12
mA. During this period the VKAM current is supplied from the
reverse battery protected KA_VBAT input.
The KA_VBAT supply pin is the power source to the Keep
Alive Memory regulator (VKAM) in power down mode. Power
is continuously supplied regardless of the state of the ignition
switch (VIGN input). The KA_VBAT input is reverse battery
protected but requires external load dump protection (refer to
Figure 1).
The VIGN pin is used as a control input to the 33394. The
regulation circuits will function and draw current from VBAT
when VIGN is high (active) or REGON is high (active) or on
CAN bus activity (WAKEUP active). To keep the VIGN input
from floating, a 10kW pull–down resistor to GND should be
used. The VIGN pin has a 3.0 V threshold and 1.0 volt of
hysteresis. VIGN is designed to operate up to +26.5 volt
battery while providing reverse battery and +45 volt load dump
protection. The input requires ESD, and transient protection.
See Figure 1 for external component required.
4.2. Switching Regulator Functional Description
A block diagram of the internal switching regulator is shown
in Figure 4. The switching regulator incorporates circuitry to
implement a Buck or a Buck/Boost regulator with additional
external components. A high voltage, low RDS(on) power
MOSFET is included on chip to minimize the external
components required to implement a Buck regulator. The
power MOSFET is a sense FET to implement current limit. For
low voltage operation, a low side driver is provided that is
capable of driving external logic level MOSFETs. This allows
a switching regulator utilizing Buck/Boost topology to be
implemented. Two independent control schemes are utilized
in the switching regulator.
In Buck mode, voltage mode pulse–width modulation
(PWM) control is used. The switcher output voltage divided by
an internal resistor divider is sensed by an Error Amplifier and
compared with the bandgap reference voltage. The PWM
Comparator uses the output signal from the Error Amplifier as
the threshold level. The PWM Comparator compares the
sawtooth voltage from the Ramp Generator with the output
signal from the Error Amplifier thus creating a PWM signal to
the control logic block. The Error Amplifier inverting input and
output are brought out to enable the control loop to be
externally compensated. The compensation technique is
described in paragraph 5.2.3. Buck Converter Feedback
Compensation in the Application Information section. In
order to improve line rejection, feed forward is implemented in
the ramp generator. The feed forward modifies the ramp slope
in proportion to the VBAT voltage in a manner to keep the loop
gain constant, thus simplifying loop compensation. At startup,
a soft start circuit lowers the current limit value to prevent
potentially destructive in–rush current.
In Boost mode, pulse–frequency modulation (PFM) control
is utilized. The duty cycle is set to 75% and the switching
action is stopped either by the Boost Comparator, sensing the
switcher output voltage VPRE, or by the Current Limit circuit
when the switching current reaches its predetermined limit
value. This control method requires no external components.
The selection of the control method is determined by the
control logic based on the VBAT input voltage.
4.2.1. Switching Transistor (SW1)
The internal switching transistor is an n–channel power
MOSFET. The RDS(on) of this internal power FET is
approximately 0.25 ohm at +125_C. The 33394 has a nominal
instantaneous current limit of 3.0 A (well below the saturation
current of the MOSFET and external surface mounted
inductor) in order to supply 1.2 A of current for the linear
regulators that are connected to the VPRE pin (see Figure 1).
The input to the drain of the internal N—channel MOSFET
must be protected by an external series blocking diode, for
reverse battery protection (see Figure 1).
4.2.2. Bootstrap Pin (BOOT)
An external bootstrap 0.1 µF capacitor connected between
SW1 and the BOOT pin is used to generate a high voltage
supply for the high side driver circuit of the buck controller. The
capacitor is pre charged to approximately 10V while the
internal FET is off. On switching, the SW1 pin is pulled up to
VBAT, causing the BOOT pin to rise to approximately
VBAT+10V — the highest voltage stress on the 33394.
4.2.3. External MOSFET Gate Drive (SW2G)
This is an output for driving an external FET for boost mode
operation. Due to the fact that the gate drive supply voltage is
VPRE the external power MOSFET should be a logic level
device. It also has to have a low RDS(on) for acceptable
efficiency. During buck mode, this gate output is held low.
4.2.4. Compensation (INV, VCOMP)
The PWM error amplifier inverting input and output are
brought out to allow the loop to be compensated. The
recommended compensation network is shown in Figure 18
and its Bode plot is in Figure 19. The use of external
compensation components allows optimization of the buck
converter control loop for the maximum bandwidth. Refer to
the paragraph 5.2.3. Buck Converter Feedback
Compensation in the Application Information section for
further details of the buck controller compensation.
4.2.5. Switching Regulator Output Voltage (VPRE)
The output of the switching regulator is brought into the chip
at the VPRE pin. This voltage is required for both the switching
regulator control and as the supply voltage for all the linear
regulators.
For More Information On This Product,
16 Go to: wwwMO.fTrOeeRsOcLAalAeN.cAoLmOG INTEGRATED CIRCUIT DEVICE DATA










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