FS6500 datasheet(63/153 Pages) NXP

63 / 153 page

NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

must be left open. It is recommended to use 1.0 % accuracy resistors and set R4 = 8.06 kΩ and adjust R3

to obtain the final VCORE voltage needed for the MCU core supply. When VCORE is used in linear mode, the

power dissipation must be taken into account at low-voltage.

FB_CORE

FCRBM

VCORE VOLTAGE

COUT_VCORE

R3b

R4b

GND

PGND

GND

aaa-037776

Figure 47. VCORE linear regulator

12.7.2.7 Current limitation

Similar to the buck converter mode, a current limitation is implemented to avoid uncontrolled power dissipation

inside the device (see Section 12.7.2.3).

12.7.2.8 Voltage monitoring

The linear regulator has the same voltage monitoring than the DC–DC buck converter (see Section 12.7.2.4).

12.7.3 Charge pump and bootstrap

Both switching MOSFETs of VPRE and VCORE SMPS are driven by external bootstrap capacitors. Additionally,

a charge pump is implemented to ensure 100 % duty cycle for both converters. Each converter uses a 100 nF

external capacitor minimum to operate properly.

12.7.4 VCCA voltage regulator

VCCA is a linear voltage regulator mainly dedicated to supply the MCU I/Os, especially the ADC. The output

voltage is selectable at 5.0 V, or 3.3 V. Since this output voltage can be used to supply MCU I/Os, the output

voltage selection is done using an external resistor connected to the SELECT pin and ground or VPRE. When

VCCA is used with the internal MOS transistor, the VCCA_E pin must be connected to VPRE. The voltage

accuracy is ±1.0 % for 5.0 V and 3.3 V configuration with an output current capability at 100 mA.

When VCCA is used with an external PNP transistor to boost the current capability up to 300 mA, the

connection is detected automatically during the start-up sequence of the FS6500/FS4500. In such condition,

the internal pass transistor is switched off and all the current is driven through the external PNP to reduce the

internal power dissipation. The output voltage accuracy with an external PNP is reduced to ±3.0 % at 300 mA

current load. The VCCA output voltage is used as a reference for the auxiliary voltage supply (VAUX) when

VAUX is configured as a tracking regulator.

FS6500-FS4500-ASILD

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 8 — 5 August 2024

Document feedback

63 / 153

FS6500 Datasheet(PDF) 63 Page - NXP Semiconductors

FS6500 Datasheet(HTML) 63 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL