參數(shù)資料
型號(hào)： PC33394FCR2
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 18/44頁(yè)
文件大?。?/td> 409K
代理商： PC33394FCR2
PC33394
18
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
down circuit disables the output source transistor once the
local die temperature exceeds +150
°
C to +190
°
C. The output
transistor remains off until the locally sensed temperature is
5
°
C to 20
°
C. below the trip off temperature. The output(s) will
periodically turn on and off until either the die temperature
decreases or until the fault condition is removed. If one of
these outputs goes into over—temperature shutdown, it will
not impact the operation of any of the other outputs (assuming
that no other package thermal or VPRE current limit
specifications are violated). Fault information is reported
through the SPI communication interface (see Figure 8).
4.6. Voltage Regulator (VDD3_3)
This linearly regulated +3.3 V +/–0.06 V voltage supply is
capable of sourcing 120 mA of steady state current from
VPRE (+5.6 V) for VBAT voltage from +4.0 V to +26.5 V (+45V
transient). This regulator incorporates current limit short
circuit protection and thermal protection. When no external
pass transistor is used the VDD3_3 and the VDD3_3FB pins
must be shorted together — see Figure 22. The current
capability of the VDD3_3 output can be increased by means
of an external pass transistor — see Figure 1. When the
external pass transistor is used the VDD3_3 internal short
circuit current limit does not provide the short circuit
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.
recommended output capacitor parameters.
See
Table
1
for
4.7. Voltage Regulator (VDDL)
The output voltage of the VDDL linear regulator is
adjustable by means of an external resistor divider.
This linearly regulated +/–2% core voltage supply uses an
external pass transistor and is capable of sourcing 40 mA
base drive current typically (see application circuit, Figure 1)
of steady state current. The collector of the external NPN pass
transistor is connected to VPRE (+5.6 V) for a VBAT voltage
from +7.5 V to +26.5 V (+45V transient). 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.
Also, the dynamic load characteristics of the microprocessor,
relative to CPU clock frequency changes must be considered.
An additional external pass transistor, for VDDL regulation in
the Boost mode, can be added between protected battery
voltage (see Figure 1) and VDDL, with its base driven by
VDDL_X. In that arrangement the PC33394’s core voltage
supply operates over the whole input voltage range VBAT =
+4.0 V to +26.5 V (up to +45V transient). See Table 1 for
recommended output capacitor parameters.
NOTE:
The use of an EXTERNAL pass device allows the power
dissipation of the PC33394 to be reduced by approximately
50% and thereby allows the use of a thermally efficient
package such as an HSOP 44 or QFN 44. The base drive
control signal (VDDL_B) is provided by on chip circuitry. The
regulated output voltage sense signal is fed back into the on
chip differential amplifier through pin VDDL_FB. The collector
of this external pass device should be connected to VPRE to
minimize power dissipation and adequately supply 400 mA.
Proper thermal mounting considerations must be accounted
for in the PCB design.
4.8. Tracking Keep–Alive/Standby Supply (VKAM)
This linearly regulated Keep Alive Memory voltage supply
tracks the VDDL (+1.25 V to +3.3 V) core voltage, and is
capable of sourcing 50 mA of steady state current from VPRE
during normal microprocessor operation and 12 mA through
KA_VBAT pin during stand–by/sleep mode. The VKAM
regulator output incorporates a current limit short circuit
protection. The output requires a specific range of capacitor
values to be stable under all load/line conditions. See Table 1
for recommended output capacitor parameters.
NOTE :
The source current for the VKAM supply output depends on
the sleep/wake state of the PC33394.
4.9. Switched Battery Output (VSEN)
This is a saturated switch output, which tracks the VBAT and
is capable of sourcing 125 mA of steady state current from
VBAT. This regulator will track the voltage VBAT to less than
200 mV, and its output voltage is clamped at +17 V. The gate
voltage of the internal N—channel MOSFET is provided by a
charge pump from VBAT. There is an internal gate–to–source
voltage clamp. This regulator is short circuit protected and has
independent over—temperature protection. If this output is
shorted and goes into thermal shutdown, the normal operation
of all other voltage outputs is not impacted. This output is
controlled by the SPI VSEN bit.
NOTE:
A short to VBAT on VREF1, VREF2, VREF3 or VSEN will
not result in additional current being drawn from the battery
under normal (+8 V to +18 V) voltage levels. Under jumpstart
condition (VBAT = +26.5 V) and during load dump condition,
the device will survive this condition, but additional current
may be drawn from the battery.
4.9.1. VSEN Over Temperature Latch Off Feature
If the VSEN output is shorted to ground for any duration of
time, an over temperature shut down circuit disables the
output source transistor once the local die temperature
exceeds +150
°
C to +190
°
C. The output transistor remains off
until the locally sensed temperature drops 5
°
C to 20
°
C below
the trip–off temperature. The output will periodically turn on
and off until either the die temperature decreases or until the
fault condition is removed. If the VSEN output goes into
over—temperature shutdown, it does not impact the operation
of any of the other outputs (assuming that no other package
thermal or VPRE current limit specifications are violated).
Fault information is reported through the SPI communication
interface (see Figure 8).
4.10. Resets To Microprocessor
/PORESET – Power On Reset, /PRERESET — Pre Reset,
/HRESET– Hardware Reset. All the Reset pins are open drain
‘a(chǎn)ctive low’ outputs, capable of sinking 1.0 mA current and
able to withstand +7.0 V. See Figure 1 and Figure 20 for
recommended pull–up resistor values and their connection.
The /PORESET pin is pulled up to the VKAM voltage by a
pull up resistor. It is connected to the microprocessor Power
On Reset (POR) pin, and is normally high. During initial battery
connect the /PORESET is held to ground by the PC33394.
After the VKAM supply is in regulation and an internal 10 ms
timer has expired, the /PORESET is released. If VKAM goes
out of regulation the device will first pull the /PORESET and
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