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

o

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

L4989D, L4989MD Electrical specifications

2 Electrical specifications

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

I

V

V

V

Vsdc

Vsdc

V

Vo

I

Vo

V

Wi

V

od

I

od

V

cr

cw

WEn

T

ESD

j

DC supply voltage -0.3 to 40 V
Input current Internally limited

DC output voltage -0.3 to 6 V

DC output current Internally limited

Watchdog input voltage -0.3 to VVo + 0.3 V

Open Drain output voltage -0.3 to VVo + 0.3 V

Open Drain output current Internally limited

Reset delay voltage -0.3 to VVo + 0.3 V

Watchdog delay voltage -0.3 to VVo + 0.3 V

Watchdog Enable input voltage -0.3 to 40 V

Junction temperature -40 to 150 “C

ESD voltage level (HBM-MIL STD 883C) ±2 kV

Note: Maximum ratings are absolute ratings; exceeding any one of these values may cause

permanent damage to the integrated circuit.

2.2 Thermal data

Table 4. Thermal data

Symbol Parameter S0-8 S0-12+4+4 Unit

R

th-jamb

1. With 6 sq. cm on board heat sink.

Thermal resistance junction to ambient 130 to 180 50

(1)

Doc ID 022376 Rev. 1 7/10

°C/W

Electrical specifications L4989D, L4989MD

2.3 Electrical characteristics

VS = 5.6 V to 31 V, Tj= -40°C to +150°C unless otherwise specified.

Table 5. General

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

V

o

V

o

V

o

V

, V

S

V

o

VS, V

V

, V

S

, V

V

S

V

, V

S

V

, V

S

V

, V

S

V

, V

S

V

, V

S

V

, V

S

V

, V

S

V

o_ref

I

short_13

I

lim

V

o

o

o

line

V

load

V

dp

SVR Ripple rejection fr = 100 Hz 55 dB

Output voltage

Short circuit current VS= 13.5 V

Output current limitation VS= 13.5 V

Line regulation voltage

Load regulation voltage Io= 1 to 150 mA 25 mV

Drop voltage Io= 150 mA 180 400 mV

Current consumption with

I

o

qs_1

watchdog not active
I

qs_1=IVS-Io

Current consumption with

I

o

qs_10

watchdog not active
I

qs_10=IVS-Io

Current consumption with

I

o

qs_50

watchdog not active
I

qs_50=IVS-Io

Current consumption with

I

o

qs_150

watchdog not active
I

qs_150=IVS-Io

Current consumption with

I

o

qn_1

watchdog active
I

qn_1=IVS-Io

Current consumption with

I

o

qn_10

watchdog active
I

qn_10=IVS-Io

Current consumption with

I

o

qn_50

watchdog active
I

qn_50=IVS-Io

Current consumption with

I

o

qn_150

Tw

watchdog active
I

qn_150=IVS-Io

Thermal protection
temperature

VS= 5.6 to 31 V;
I

= 1 to 150 mA

o

(1)

(1)

= 5.6 to 31 V;

V

S

= 1 to 150 mA

I

o

VS= 13.5 V;
I

<1mA;

o

=low

WE

n

VS= 13.5 V;
I

=10mA;

o

=low

WE

n

VS= 13.5 V;
I

=50mA;

o

=low

WE

n

VS= 13.5 V;
I

=150mA;

o

=low

WE

n

VS= 13.5 V;
I

<1mA;

o

=high

WE

n

VS= 13.5 V;
I

=10mA;

o

=high

WE

n

VS= 13.5 V;
I

=50mA;

o

=high

WE

n

VS= 13.5 V;
I

=150mA;

o

=high

WE

n

4.85 5.0 5.15 V

160 210 250 mA

170 250 290 mA

69 115 µA

127 300 µA

498 900 µA

1.40 2 mA

110 170 µA

168 350 µA

538 1000 µA

1.45 2 mA

150 190 °C

25 mV

Tw _hy

1. See Figure 3.

Thermal protection
temperature hysteresis

8/10 Doc ID 022376 Rev. 1

10 °C

L4989D, L4989MD Electrical specifications

T able 6. Reset

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

R

=5kΩ to Vo;

Res Vres_l Reset output low voltage

Res I

Res R

Res V

Vcr V

Vcr V

Vcr I

Vcr I

Res T

Res T

1. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset
condition in this particular case.

Res_lkg

Res

o_th

rlth

rhth

cr

dr

rr_2

rd

Reset output high leakage
current

Pull up internal resistance Versus V

Reset threshold voltage

Reset timing low threshold VS= 13.5 V 10% 13% 16%

Reset timing high threshold VS= 13.5 V 44% 47% 50%

Charge current VS= 13.5 V 8 15 30 µA

Discharge current VS= 13.5 V 8 15 30 µA

Reset reaction time

(1)

Reset delay time

ext

V

>1V

o

=5V 1 µA

V

Res

o

= 5.6 to 31 V;

V

S

= 1 to 150 mA

I

o

Vo=V

o_th

= 13.5 V;

V

S

Ctr = 1 nF

-100 mV 100 250 700 µs

10 20 50 kΩ

6% 8% 10%

65 115 165 ms

0.4 V

Below
V

o_ref

V

o_ref

V

o_ref

Table 7. Watchdog

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

Wi Vih Input high voltage V

Wi Vil Input low voltage V

Wi Vih Input hysteresis V

= 13.5 V 3.5 V

S

= 13.5 V 1.5 V

S

= 13.5 V 500 mV

S

Wi Rwi Pull down resistor VS= 13.5 V 30 100 250 KΩ

Vcw Vwhth High threshold V

= 13.5 V 44% 47% 50%

S

Vcw Vwlth Low threshold VS= 13.5 V 10% 13% 16%

= 13.5 V;

V

Vcw Icwc Charge current

Vcw Icwd Discharge current

Vcw Twop Watchdog period

Res twol Watchdog output low time

S

Vcw = 0.1 V

= 13.5 V;

V

S

Vcw = 2.5 V

= 13.5 V;

V

S

Ctw = 47 nF

= 13.5 V;

V

S

Ctw = 47 nF

51020µA

1.25 2.5 5 µA

20 40 80 ms

4816ms

V

V

o_ref

o_ref

Doc ID 022376 Rev. 1 9/10

Electrical specifications L4989D, L4989MD

Table 8. Watchdog Enable

Pin Symbol Parameter Test condition Min. Typ. Max. Unit

WE

WE

WE

WE

V

n

n

n

n

WEn_l

V

WEn_h

V

WEn_hy

I_leak Pull down current VS= 13.5 V 1 2.5 5 µA

Enable input low voltage 1 V

Enable input high voltage 3 V

Enable input hysteresis 600 920 1300 mV

10/10 Doc ID 022376 Rev. 1

L4989D, L4989MD Application information

Vo

Vo_ref

IoutIshort Ilim

3 Application information

3.1 Voltage regulator

The voltage regulator uses a p-channel MOS transistor as a regulating element. With this
structure a very low dropout voltage at current up to 150 mA is obtained. The output voltage
is regulated up to transient input supply voltage of 40 V. No functional interruption due to
over-voltage pulses is generated.The voltage Regulator is always active and not depending
on the state of WE

input pin. A short circuit protection to GND is provided.

n

Figure 3. Behavior of output current versus regulated voltage V

3.2 Reset

The reset circuit supervises the output voltage Vo. The V
the in-ternal reference voltage and a resistor output divider. If the output voltage becomes
lower than V
guaranteed for an output voltage V

When the output voltage becomes higher than V
This delay is obtained by an internal oscillator.

The oscillator period is given by:

T

osc

where:

I

cr

I

dr

V

rhth

C

tr

t

is given by:

rd

t

rd

The Reset is always active and not depending on the state of WEn input pin.

reset threshold is defined with

o_th

then Res goes low with a reaction time trr. The reset low signal is

o_th

= [(V

rhth-Vrlth

) x Ctr] / Icr + [(V

greater than 1 V.

o

o_th

rhth-Vrlth

) x Ctr] / I

then Res goes high with a delay trd.

dr

: is an internally generated charge current

: is an internally generated discharge current

, V

: are two voltages defined with the output voltage and a resistor output

rlth

divider

: is an external capacitance.

= 512 x T

osc

o

Doc ID 022376 Rev. 1 11/10

Application information L4989D, L4989MD

TRR

TRR

TRD4 OSC

4OSC

6RHTH
6RLTH

2ES

6CR

6O

7I

6OUT?TH

'!0'#&4

7I

6CW

2ES

6WLTH

6WHTH

TWOP

TWOL

6WLTH

("1($'5

Figure 4. Reset timing diagram

3.3 Watchdog

A connected microcontroller is monitored by the watchdog input Wi. If pulses are missing,
the Reset output pin is set to low. The pulse sequence time can be set within a wide range
with the external capacitor, C
constant current I

. If the lower threshold V

cwd

To prevent this the microcontroller must generate a positive edge during the discharge of the
capacitor before the voltage has reached the threshold V
minimum time t, during which the micro-controller must output the positive edge, the
following equation can be used:

Every Wi positive edge switches the current source from discharging to charging. The same
happens when the lower threshold is reached. When the voltage reaches the upper
threshold, V

, the current switches from charging to discharging. The result is a saw-tooth

whth

voltage at the watchdog timer capacitor C

. The watchdog circuit discharges the capacitor Ctw, with the

tw

(V

whth-Vwlth

is reached, a watchdog reset is generated.

wlth

. In order to calculate the

wlth

tw

.

) x Ctw = I

cwd

x t

Figure 5. Watchdog timing diagram

12/10 Doc ID 022376 Rev. 1

L4989D, L4989MD Package and packing information

'!0'#&4

4 Package and packing information

4.1 ECOPACK® packages

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK

®

is an ST trademark.

4.2 SO-8 package information

Figure 6. SO-8 package dimensions

Doc ID 022376 Rev. 1 13/10

Package and packing information L4989D, L4989MD

T able 9. SO-8 mechanical data

Symbol

Min. Typ. Max.

A 1.75

A1 0.10 0.25

A2 1.25

b0.28 0.48

c0.17 0.23

(1)

D

4.80 4.90 5.00

E 5.80 6.00 6.20

(2)

E1

3.80 3.90 4.00

e1.27

h0.25 0.50

L0.40 1.27

Millimeters

L1 1.04

k0° 8°

ccc 0.10

1. Dimensions D does not include mold flash, protrusions or gate burrs. Mold flash, potrusions or gate burrs

shall not exceed 0.15mm in total (both side).

2. Dimension “E1” does not include interlead flash or protrusions. Interlead flash or protrusions shall not

exceed 0.25mm per side.

14/10 Doc ID 022376 Rev. 1

L4989D, L4989MD Package and packing information

4.3 SO-20 package information

Figure 7. SO-20 package dimensions

T able 10. SO-20 mechanical data

Symbol

Min. Typ. Max.

A2.35 2.65

A1 0.10 0.30

B0.33 0.51

C0.23 0.32

(1)

D

12.60 13.00

E7.40 7.60

e1.27

H 10.0 10.65

h0.25 0.75

L0.40 1.27

k0° 8°

ddd 0.10

Millimeters

1. “D” dimension does not include mold flash, protusions or gate burrs. Mold flash, protusions or gate burrs

shall not exceed 0.15mm per side.

Doc ID 022376 Rev. 1 15/10

Package and packing information L4989D, L4989MD

All dimensions are in mm.

Base Q.ty 100
Bulk Q.ty 2000
Tube length (± 0.5) 532
A 3.2
B 6
C (± 0.1) 0.6

C

B

A

Tape dimensions

According to Electronic Industries Association
(EIA) Standard 481 rev. A, Feb. 1986

All dimensions are in mm.

Tape width W 12
Tape Hole Spacing P0 (± 0.1) 4
Component Sp acing P 8
Hole Diameter D (+0.1/-0) 1.5
Hole Diameter D1 (min) 1.5
Hole Position F (± 0.05) 5.5
Compartment Depth K (max) 4.5
Hole Spacing P1 (± 0.1) 2

Top

cover

tape

End

Start

No componentsNo components Components

500mm min

500mm min

Empty components pockets
saled with cover tape.

User direction of feed

Reel dimensions

All dimensions are in mm.

Base Q.ty 2500
Bulk Q.ty 2500
A (max) 330
B (min) 1.5
C (± 0.2) 13
F 20.2
G (+ 2 / -0) 12.4
N (min) 60
T (max) 18.4

4.4 SO-8 packing information

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

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

16/10 Doc ID 022376 Rev. 1

L4989D, L4989MD Package and packing information

All dimensions are in mm.

Base Q.ty 40
Bulk Q.ty 800
Tube length (± 0.5) 532
A 3.5
B 13.8
C (± 0.1) 0.6

A

C

B

Base Q.ty 1000
Bulk Q.ty 1000
A (max) 330
B (min) 1.5
C (± 0.2) 13
D 20.2
G (+ 2 / -0) 24.4
N (min) 60
T (max) 30.4

Tape dimensions

According to Electronic Industries Association
(EIA) Standard 481 rev. A, Feb. 1986

All dimensions are in mm.

Tape width W 24
Tape Hole Spacing P0 (± 0.1) 4
Component Spacing P 12
Hole Diameter D (+0.1/-0) 1.5
Hole Diameter D1 (min) 1.5
Hole Position F (± 0.05) 11.5
Compartment Depth K (max) 6.5
Hole Spacing P1 (± 0.1) 2

Top

cover

tape

End

Start

No componentsNo components Components

500mm min

500mm min

Empty components pockets
saled with cover tape.

User direction of feed

Reel dimensions

4.5 SO-20 packing information

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

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

Doc ID 022376 Rev. 1 17/10

Revision history L4989D, L4989MD

5 Revision history

Table 11. Document revision history

Date Revision Changes

16-Apr-2012 1

Initial release.
This document replace the L4989 datasheet.

18/10 Doc ID 022376 Rev. 1

L4989D, L4989MD

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Doc ID 022376 Rev. 1 19/19