ST L4989D, L4989MD User Manual

Features

SO-8

SO-20

■ Operating DC supply voltage range 5.6 V to

31 V

■ Very low quiescent current with watchdog

disabled

■ Precision output voltage (3%)

■ Low drop voltage (180 mV typ at I

■ Reset circuit sensing the output voltage down

to 1 V

■ Programmable reset delay with external

capacitor

■ Watchdog disable input

■ Programmable watchdog timer with external

capacitor

■ Thermal shutdown and short circuit protection

■ Wide temperature range (T

= -40°C to 150°C)

j

= 150 mA)

o

L4989D

L4989MD

Low power voltage regulator

Datasheet − production data

Description

The L4989M and L4989MD are monolithic
integrated 5 V voltage regulators with a low drop
voltage at currents up to 150 mA.

The output voltage regulating element consists in
a p-channel MOS and the regulation is performed
regardless of input voltage transients up to 40 V.
The high precision of the output voltage is
obtained with a pre-trimmed reference voltage.

Table 1. Device summary

Package

SO-8 L4989D L4989D013TR

SO-20 L4989MD L4989MD013TR

The devices are protected against short circuit
and an overtemperature protection switches off
the devices in case of extremely high power
dissipation.

The L4989M and L4989MD watchdogs are active
when the Enable pin is high. Features like reset
and watchdog make this devices particularly
suitable to supply microprocessor systems in
automotive applications.

Order codes

Tube Tape and reel

April 2012 Doc ID 022376 Rev. 1 1/19

This is information on a product in full production.

www.st.com

1

Contents L4989D, L4989MD

Contents

1 Block diagram and pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 ECOPACK® packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3 SO-20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.4 SO-8 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.5 SO-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2/19 Doc ID 022376 Rev. 1

L4989D, L4989MD List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 5. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 6. Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 7. Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 8. Watchdog Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 9. SO-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 10. SO-20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Doc ID 022376 Rev. 1 3/19

List of figures L4989D, L4989MD

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Pins configuration (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. Behavior of output current versus regulated voltage V

Figure 4. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5. Watchdog timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 6. SO-8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 7. SO-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 8. SO-8 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 9. SO-8 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 10. SO-20 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 11. SO-20 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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4/19 Doc ID 022376 Rev. 1

L4989D, L4989MD Block diagram and pin configuration

1 Block diagram and pin configuration

Figure 1. Block diagram

Table 2. Pins description

Pin name SO-8(D) S0-20(MD) Function

WE

n

11

Watchdog Enable input
If high watchdog functionality is active

Gnd 2 4 Ground reference

Gnd 5, 6, 15, 16

Ground.
Connected these pins to a heat spreader ground

Reset output.

Res 3 7

It is pulled down when output voltage goes below V
or frequency at Wi is too low.

Reset timing adjust.

Vcr 4 10

A capacitor between Vcr pin and gnd, sets the reset
delay time (t

)

rd

Watchdog timer adjust

Vcw 5 11

A capacitor between Vcw pin and gnd, sets the time
response of the watchdog monitor.

Watchdog input.

Wi 6 14

If the frequency at this input pin is too low, the Reset
output is activated.

o_th

Doc ID 022376 Rev. 1 5/10

Block diagram and pin configuration L4989D, L4989MD

Table 2. Pins description (continued)

Pin name SO-8(D) S0-20(MD) Function

Voltage regulator output

V

o

717

Block to ground with a capacitor >100nF (needed for
regulator stability)

V

S

N.C.

820

2, 3, 8, 9, 12,

13, 18, 19

Supply voltage
Block to ground directly at IC pin with a capacitor

Not connected

Figure 2. Pins configuration (top view)

WEn

GND

Res

Vcr

1
2

SO-8

3

4

8

7

6

5

Vs

Vo

Wi
Vcw

WEn

N.C.

N.C.

GND

GND

GND

Res

N.C.

N.C.

Vcr

1

2

3

4

5

6
7

8

9

10

SO-20

20

19
18
17
16
15
14

13

12

11

GAPGCFT00666

Vs

N.C.

N.C.

Vo

GND
GND

Wi
N.C.

N.C.

Vcw

6/10 Doc ID 022376 Rev. 1