MC33394DWB Freescale Semiconductor, MC33394DWB Datasheet - Page 17

• Manufacturer Part Number: MC33394DWB
• Description: IC POWER SUPPLY MULT-OUT 54-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33394DWB

• Applications: Motorola MPC55x, MPC56x Microprocessors
• Interface: SPI Serial
• Voltage - Supply: 4 V ~ 26.5 V
• Package / Case: 54-SOIC (0.300", 7.50mm Width) Exposed Pad
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.2.6. Switching Regulator Output Voltage Sense
(VPRE_S)
The switcher output voltage VPRE is divided by an internal
4.3. Voltage Regulator (VDDH)
voltage supply capable of sourcing a maximum of 400 mA
steady state current from VPRE (+5.6 V) for VBAT voltages
from +4.0 V to +26.5 V (+45V transient). This regulator
incorporates current limit short circuit protection and thermal
shut down protection. The voltage output is stable under all
load/line conditions. However, the designer must consider
ripple and high frequency filtering as well as regulator
response, when choosing external components. See Table 1
in the Applications Information section for recommended
output capacitor parameters.
NOTE :
during the power up sequence. Refer to the Electrical
Characteristics VDDH Regulator Section for the maximum
allowed backfed current into the VDDH output.
4.4. Tracking Voltage Regulator (VPP)
voltage supply is capable of sourcing 150 mA of steady state
current from VPRE (+5.6 V) for VBAT voltage from +4.0 V to
+26.5 V (up to +45V transient). It tracks the VDDH or VDD3_3
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
This is the switching regulator output voltage sense input.
The VDDH output is a linearly regulated +5.0 +/– 0.10V
Backfeeding into the VDDH output can cause problems
This linearly regulated +5.0 V/+3.3 V (SPI selectable)
VBAT
SWITCHER
THERMAL
ENABLE
MODE
LIMIT
Freescale Semiconductor, Inc.
V bg
For More Information On This Product,
Figure 4. Switching Regulator Block Diagram
START
SOFT
Go to: www.freescale.com
GENERATOR
FORWARD
CURRENT
CONTROL
BUCK &
BOOST
LOGIC
RAMP
FEED
LIMIT
33394
OSCILLATOR
SWITCHER
200 kHz
VPRE
PWM
COMP
resistor divider and compared with the bandgap reference
voltage (see Figure 4).
description of the switching regulator operation.
output, and incorporates current limit short circuit protection
and over temperature shut down protection. This output is
intended for FLASH memory programming and includes a
dedicated enable pin (VPP_EN). The regulator enable can
also be controlled through the SPI interface but requires both
the VPP_EN pin and the SPI bit (EN_VPP bit) to be high to
enable. The selection of tracking VDDH or VDD3_3 is
controlled by the VPP_V bit in the SPI. Logic “1” selects VDDH
(default), logic “0” selects VDD3_3. The voltage output is
stable under all load/line conditions. However, the designer
must consider ripple and high frequency filtering as well as
regulator response when choosing external components. See
Table 1 for recommended output capacitor parameters.
with the VDDH regulator, because this arrangement can
corrupt the proper power sequencing of the IC.
4.5. Tracking Voltage Regulator (VREFn)
are 100 mA at +5.0 V. They track the VDDH output. The power
supplies are designed to supply power to sensors that are
located external to the module. These regulators may be
enabled or disabled via the SPI, which also provides fault
reporting for these regulators. They are protected for short to
V bg
Refer to Section 5 Application Information for detailed
The VPP tracking regulator should not be used in parallel
The outputs of the VREF1, VREF2, VREF3 linear regulators
VPRE
COMP
+
–
BOOTSTRAP
V bg
HS
DRIVER
LS
DRIVER
+
–
E/A
1.25 V
V bg
BOOST
COMP
–
+
1.25 V
V bg
11.7 k
+
–
40 k
1.25 V
V bg
VPRE
BOOT
SW1
VPRE
SW2G
VPRE_S
INV
VCOMP
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