TLE8262E Datasheet, PDF (21/93 Pages) Infineon Technologies AG – Universal System Basis Chip HERMES Rev. 1.0

6
Internal Voltage Regulator
6.1
Block Description
Vs
Vref
1
Bandgap
Reference
Vref
Overtemperature
Shutdown
1
TLE8262E
Internal Voltage Regulator
V _{CC 1µC}
V_CC2
State
Machine
INH
Charge
Pump
Figure 4 Functional Block Diagram
GND
INTE RNA L RE GULA TOR DIA GRA M. V S D
The internal voltage regulators are dual low-drop voltage regulators that can supply loads up to I_{CC1µC/2_max}. An
input voltage up to V_SMAX is regulated to V_{cc1µC/2_nom} = 5.0 V with a precision of ±2%. Due to its integrated reset
circuitry, featuring two SPI configurable power-on timing (t_RDx) and three SPI configurable output voltages (V_RTx)
monitoring, the device is well suited for microcontroller supply. The design enables stable operation even with
ceramic output capacitors down to 470nF, with ESR < 1 Ω @ f = 10 kHz. The device is designed for automotive
applications, therefore it is protected against overload, short circuit, and overtemperature conditions. Figure 4
shows the functional block diagram. If the V_S voltage is lower than V_{UV_OFF}, the DMOS of the voltage regulator is
switched to high impedance. The body diodes of the DMOS might go into conduction when V_CC1µC or V_CC2 > V_S
(no reverse protection).
6.2
Internal Voltage Regulator Modes
It is possible to turn V_cc1µC via SBC Modes and V_cc2 activity ON or OFF via SPI command or by entering SBC
modes. The limiting current for the both regulators is I_{CC1µC_max}/I_CC2.
6.3
Internal Voltage Regulator Modes with SBC Mode
Depending on the SBC Mode in use, V_cc1µC and V_cc2 can be either ON or OFF by definition, V_cc2 can be also turned
ON or OFF, via SPI. Table 3 identifies the possible states of the voltage regulators, based on the various SBC
modes.
Data Sheet
21
Rev. 1.0, 2009-03-31