TDA3602 datasheet(5/26 Pages) PHILIPS

5 / 26 page

July 1994

Philips Semiconductors

Product speciﬁcation

Multiple output voltage regulator

TDA3602

PINNING

SYMBOL

DESCRIPTION

positive supply voltage

REG1

Regulator 1 output

RESET

reset output

Vsc

state control input

HOLD

hold output

GND

ground

REG3

Regulator 3 output

Vbu

back-up

REG2

Regulator 2 output

handbook, halfpage

MCD345

GND

REG1

REG3

REG2

TDA3602

RESET

HOLD

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

This multiple output voltage regulator contains three fixed

voltage regulators, numbered 1, 2 and 3. Two of these can

be switched between the on and off states using the state

control pin (pin 4). The third (Regulator 3), which is

continuously in, can be switched by the state control pin

between a low and a high current mode.

In addition to Regulators 1 and 2, the device is supplied by

an internal switch that is open when the supply voltage

falls below the back-up voltage (negative field decay or

engine start procedure), or during a load dump. (During

this load dump, Regulators 1 and 2 are switched off and

RESET is switched LOW). This switched supply voltage

(the so-called back-up voltage (Vbu), is available at pin 8.

An electrolytic capacitor can be connected to this pin, and

the charge on this capacitor can be used to supply the

device for a short period after the supply voltage is

removed.

Three pins are provided for interfacing with a

microprocessor:

• state control pin

• hold output pin

• reset output pin.

When the supply voltage (VP) is connected to the device,

Vbu will rise. When Vbu reaches 7.9 V, the device is in the

power-on mode. The RESET output goes HIGH and

Regulator 3 is switched on. In a microprocessor

application, the RESET output can be used to call up the

CPU and to initialize the program.

What follows depends on the voltage at the state control

pin (Vsc). In most applications, when the supply voltage is

connected, Vsc will rise slowly (e.g. by charging a

capacitor).The device will leave the power-on mode and

enter the reset mode when Vsc rises above 2.2 V. In both

the power-on and reset modes, Regulator 3 will be in the

high current mode, Regulators 1 and 2 will be switched off

and the RESET output will be HIGH.

The device will enter the wake mode when Vsc reaches 2.8

V. The RESET pin will go LOW and the CPU must be

switched to the sleep mode. Regulator 3 is still in the high

current mode.

As Vsc continues rising and the voltage reaches 3.6 V, the

stabilizer will be switched into the sleep mode. It will be in

a coma mode when Vsc is greater than 3.8 V. In this mode,

only the relevant circuits remain operating; this is to keep

the power consumption as low as possible i.e. typically 290

µA.

If the device is switched on with Vsc already higher than 3.8

V, the device will be switched directly from the power-on

mode into the coma mode.

When Vsc is lowered gradually from 3.6 V (or higher) to 2

V, the device will go from sleep to reset again.

Vsc must be lower than 1.1 V to bring the device into the on

mode; note that this is not the same as the power-on

mode. In this condition, Regulator 3 is in the high current

mode, both Regulators 1 and 2 are switched on and the

HOLD output will be HIGH (depending on the state of VP

and the in-regulation condition of Regulators 1 and 2).

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