tda3683 NXP Semiconductors, tda3683 Datasheet - Page 6

• Manufacturer Part Number: tda3683
• Description: Tda3683 Multiple Voltage Regulator With Switch And Ignition Buffer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
TDA3683_2
Product data sheet
7.1 Standby regulators
7.2 Switched regulators
Table 3:
[1]
The TDA3683 is a multiple output voltage regulator with a power switch and ignition buffer.
The device is primarily intended for use in car radio applications. An overall functional
description of the building blocks is given in the following sections.
The standby regulators (pins REG1, REG2 and REG3) are used for digital circuitry that
has to be permanently connected to a supply voltage (e.g. CAN bus DSP core or
microcontroller). REG1 is controlled by its own active HIGH enable input (EN1). REG2
and REG3 have a combined enable input (EN2/3) with similar logic properties. Permanent
voltage tracking will exist between REG2 and REG3 during power-up and power-down. All
standby regulators have a low quiescent current and will not be switched off during
thermal shutdown and load dump conditions. The outputs are protected against overload
and short-circuit conditions by a current limit / foldback protection.
The switched regulators (pins REG4, REG5, REG6 and REG7) are activated by the active
HIGH mode input. The regulators are protected against overload and short-circuit
conditions by a current limit / foldback protection. They will be switched off during thermal
shutdown and load dump conditions. The output voltage of REG7 can be adjusted (2.4 V
to 10 V) by using two external resistors connected between the regulator output, the
feedback input and ground; see
case of inductive loads.
Symbol
REG2
STC
REG1
RST1
REG4
RDC1
EN1
EN2/3
REG7
ADJ7
GND
The heat tab is internally connected to pin GND.
Pin description
Pin
13
14
15
16
17
18
19
20
21
22
23
Rev. 02 — 7 October 2005
…continued
Multiple voltage regulator with switch and ignition buffer
Description
regulator 2 output
storage capacitor (backup) output
regulator 1 output
reset output for regulator 1
regulator 4 output
reset delay capacitor for regulator 1
enable input for regulator 1
enable input for regulators 2 and 3
regulator 7 output
regulator 7 adjust input
ground / substrate
Figure
10. REG7 has a built-in flyback clamp for use in
[1]
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
TDA3683
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