參數(shù)資料
型號(hào)： TLE7368G
廠商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36
封裝： PLASTIC, SOP-36
文件頁(yè)數(shù)： 20/39頁(yè)
文件大?。?/td> 932K
代理商： TLE7368G
Data Sheet
27
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
5.5
Stand-by Regulator
The intention of the stand-by or keep alive regulator is to supply e.g. external memory even with the main
microcontroller supply being disabled. Therefore the state of the stand-by regulator is not controlled by the enable
block, but it is active all the time. The stand-by regulator starts to operate as soon as the battery voltage increases
above its operating threshold. The current consumption during single operation of the stand-by regulator is
reduced to a minimum. It can be configured for output voltages as either 1.0 V or 2.6 V through the SEL_STBY pin.
5.6
Overtemperature Protection
At junction temperatures between 160
°C and 190 °C, which can be caused by e.g. excessive power dissipation
or increased ambient temperatures, the overtemperature protection kicks in and disables the Buck converter. With
the Buck converter disabled the linear regulators will most likely not be able to keep up their output voltage and a
system reset can be expected. Due to the drop in power dissipation the junction temperature will decrease. The
built in hysteresis circuit ensures that the junction temperature cools down by a certain temperature delta before
the Buck converter is enabled again.
5.7
Device Enable Function
The device enable block controls the operation of the Buck converter as well as of the linear regulators and tracker
blocks. Two external signal inputs determine the state of those blocks, a high voltage input EN_IGN and a low
voltage input EN_uC. Internally the two signals are logic OR-ed which means that with either signal the Buck and
linear regulators can be turned on or held active, provided that the battery voltage is above its minimum operating
range. In order to turn off the regulator blocks, the signals on both inputs, EN_IGN and EN_uC must be lower than
their deactivating threshold. The stand-by regulator’s operation is not affected by the device enable block.
5.8
Reset Function
The Reset concept of the TLE7368 is chosen to support multiple microcontroller platforms. Two open drain
outputs, i.e. the Reset outputs, RO_1 and RO_2, indicate the states of the different regulators. Figure 5 gives the
details on the Reset timing. RO_1 is tied to LDO1 and will indicate whenever its output, Q_LDO1, is crossing the
under- or overvoltage threshold. The second Reset output, RO_2, turns low whenever one of the two outputs,
Q_LDO2 or FB_EXT, are crossing their under- and overvoltage thresholds. At power up in order to avoid a faulty
microcontroller start, a so called Reset delay function, i.e. the Reset release delay, is implemented. This delay until
the reset is released, counted from the time where the regulator outputs cross the threshold, is determined by a
small external delay capacitor at pin RT.
The power up reset delay time
t
RD is directly proportional to the capacitance CRT within the capacitance range of
0.33 nF … 4.7 nF:
t
RD = 160 × 50 s × CRT/nF
(3)
For the tolerance calculation please refer to the parameters 4.4.77, 4.4.78 and 4.4.79. In order to find the worst
case limits of
t
RD the capacitance tolerance should be taken into account.
The Reset generators within the TLE7368 are supplied from multiple sources, VIN_STBY, VCCP, VFB_L/IN,
VQ_LDO1 and VQ_LDO2, to fulfill next generation microcontroller requirements during power up and power down.
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