ST L4989D, L4989MD User Manual

L4989D

L4989MD

Low power voltage regulator

Features

■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 Io = 150 mA)

■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 (Tj = -40°C to 150°C)

Datasheet − production data

SO-8 SO-20

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.

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.

Table 1.	Device summary
	Package		Order codes
		Tube		Tape and reel
	SO-8	L4989D		L4989D013TR
	SO-20	L4989MD		L4989MD013TR
April 2012		Doc ID 022376 Rev. 1	1/19

This is information on a product in full production.

www.st.com

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 Vo . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 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

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
	WEn	1	1	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 Vo_th
				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 (trd)
				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.

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
	Vo		7		17		Block to ground with a capacitor >100nF (needed for
							regulator stability)
	VS		8		20		Supply voltage
							Block to ground directly at IC pin with a capacitor
	N.C.				2, 3, 8, 9, 12,		Not connected
					13, 18, 19
	Figure 2.	Pins configuration (top view)
								WEn	1		20	Vs
								N.C.	2		19	N.C.
	WEn	1			8	Vs		N.C.	3		18	N.C.
								GND	4		17	Vo
	GND	2	SO-8		7	Vo
								GND	5	SO-20	16	GND
	Res	3			6	Wi
								GND	6		15	GND
	Vcr	4			5	Vcw
								Res	7		14	Wi
								N.C.	8		13	N.C.
								N.C.	9		12	N.C.
								Vcr	10		11	Vcw
												GAPGCFT00666

6/10	Doc ID 022376 Rev. 1