TDA3616T/N1,112 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA3616T/N1,112

Multiple voltage regulator with battery detection

NXP Semiconductors. 

Philips Semiconductors

Multiple voltage regulator with battery

detection

Objective specification

TDA3616

APPLICATION CIRCUIT

In Fig.9 the total quiescent current equals Iq + IRdivider.

The specified quiescent current equals Iq. When the

supply voltage is connected, the regulator will switch-on

when the supply voltage exceeds 7.5 V. With a timing

capacitor connected to pin VC the reset can be delayed

(the timer starts at the same moment as the regulator is

switched on).

Forced reset can be accomplished by short-circuiting the

timer capacitor by using the push-button switch. When the

push-button is released again, the timer restarts (only

when the regulator is on) causing a second reset on both

RES1 and RES2.

The maximum output current of the regulator equals:

IO(max) = -R----t-h---(-j----a-1-)--5-×--0---(--–-V----TP----a–--m---V--b--R----E---G----) = -5--1-0--5---×-0----(-–-V---T-P---a--–-m---5-b---) [mA]

When Tamb = 85 °C and VP = 16 V, the maximum output

current equals 118 mA. At lower ambient temperature

(Tamb < 0) the maximum output current equals 250 mA.

For successful operation of the IC (maximum output

current capability), special attention has to be paid to the

copper area required as heatsink (connected to

pins 1, 10, 11 and 20), the thermal capacity of the

heatsink and its ability to transfer heat to the external

environment.

It is possible to reduce the total thermal resistance from

120 K/W to 50 K/W).

Backup circuit

The backup function is used for supplying the regulator

and logic circuits (reset 1 and 2) when the supply voltage

is disconnected. For stability a minimum capacitor value

of 150 nF is needed.

With a supply voltage of 14.4 V the backup capacitor will

be fully charged until approximately 14.2 V. At the moment

the supply voltage is lower than the voltage on pin BU the

backup switch will be opened (this backup switch acts like

an ideal diode) and the charge of the backup capacitor is

used for supplying the regulator and the logic circuits.

The backup capacitor is mainly discharged by the load of

the regulator. After a certain period of time the regulator

output will be disabled and the backup capacitor will only

be discharged by the quiescent current of the IC itself.

In combination with the battery detection Schmitt trigger,

an early warning can be given to the microprocessor to

indicate that the battery voltage has dropped down to an

unacceptable low value, causing the microcontroller to run

on backup charge. The early warning level can be

programmed with resistors R1 and R2; see Fig.9.

handbook, full pagewidth

choke

coil

2200

µF

on/off

(closed = on)

VP BU

8 V detector

R1

360 kΩ

VI(bat)

4 (6)

17 18

(4) (5)

REG

(3) 16

R2

100 kΩ

TDA3616T

RES1

(2) 15

VC

6 (8)

(1) 14 RES2

forced reset

Cd

VO(bat)

(7) 5

7 (9)

MGL931

CBU

1000 µF

(minimum value of 150 nF

needed for stability)

CL

10 µF

used for

8 V detector

The pin numbers given in parenthesis refer to the TDA3616SF version.

Fig.9 Typical application.

2000 Jan 14

12

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