Voltage Regulator Driver with Watchdog Timer

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Monolithic Linear IC

No.2895A _{L A 5 6 9 0 D , 5 6 9 0 S}

Voltage Regulator Driver

with Watchdog Timer

The LA5690 is a single-chip voltage regulator for microcomputer system monitor use that performs the functions of 5V output voltage control, watchdog timer, and voltage detector. The LA5690 uses a minimum number of parts to provide the basic functions.

Applications

• Microcomputer system for car equipment, refrigeration/heating equipment, office automation equipment

Functions

• Output voltage 5Vcontrol • Watchdog timer

• Power-ON reset function

- Positive/negative logic output for reset Features

- An external PNP transistor can be used to provide a low-saturation voltage regulator. • CK input with edge detector

- Variable detection voltage

• Reset output with pull-up resistor of 1 Okft

Maximum Ratings at Ta = 25°C unit unit

Control Pin Voltage vCONT max lsec 60 V

Control Pin Voltage VCONT m a x 4 1 V

Control Pin Current ICONT M A X * VC C^ 6 V 11 m A

CK Input Voltage _VCK m a x 25 V

Reset Pin Voltage VREsmax, VR E S max 4 1 V

Allowable Power Dissipation Pd max 500 mW

Operating Temperature Topr - 40 to + 85 °C

Storage Temperature Tstg - 5 5 to +150 °C

*: A PNP transistor is connected to the LA5690D, 5690S externally to provide a low-saturation voltage regulator. Therefore, ICONT-- 100mA will flow, as starting current, in the V c c range where the output cannot be regulated.

Operating Conditions at Ta = 25°C Control Pin Voltage

Control Pin Current Reset Output Current Reset Detection Voltage

Package Dimensions

(unit: mm)

3001B

VC O N T ICONT m a x

IR E S max, IR E S max External R pull-up Vs min unit 6 to 40 V 10 mA 8 mA 4 V [LA5690D]

Package Dimensions

(unit: mm)

3017 B

[LA5690SJ 22.3 SANYO: DIP8 1.3 u u u ib l|J ^

J

3.0 0*25 0.5 2.54 2.S4 SANYO: SEP9

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Operating Characteristics atTa = 25°C, VCc = 14V, Io=50mA, unless otherwise specified

min typ max unit

Operating Voltage

v

0 4 . 8

5.0

5.2

V

Line Regulation A V O L N I 9 V ^ VC C^ 1 6 V

2

10

m V

A V O L N 2 6 V ^ VCc ^ 4 0 V 4

30

m V

Load Regulation A V O L D l m A ^ Io^ 5 0 m A 4

30

m V

Current Dissipation _Icc I O= O 4 . 9

6.5

raA

Output Noise Voltage V N O lOHz^f^lOOkHz, VCK: = 0

200

N V Temperature Coefficient AVQ/ATa I0 = 5mA, _ 4 0 ° C ^ T a ^ + 85°C

±0.2

m V / ° C

of Output Voltage

Reference Voltage VR E F 1 . 1 3 1 . 1 8 1 . 2 3 V

"H"-Level CK Input Voltage VI H

2

V

"L"-Level CK Input Voltage VlL 0 . 8 V

"H"-Level CK Input Current IlH VC K= 5 V

0.3

0 . 7 mA

"L"-Level CK Input Current _IlL VCK= O - 1 . 0 - 0 . 1 pA

"H"-Level Reset Output Voltage VO R H/ V0R H 4.8

5.0

5 . 2 V

"L"-Level Reset Output Voltage VQ R L I/ VO R L I 4 0 2 0 0 mV

"L"-Level Reset Output Voltage VORL2^VORL2 IR E S =IR E S =8 m A 0 . 1 6 0 . 8 V

CK Input Pulse Width tcKW VC K = 5 V 3 ps

Reset Output Delay Time _td Ct= l p F 7 . 5 1 0 1 2 . 5 ms

Watchdog Time _tWD Ct= l p F 3 . 8 5 . 0

6.2

ms

Watchdog Reset Time twR Ct= l p F 0 . 1 0 . 2 5 0 . 4 _ms

Reset Hysteresis Voltage Vhys VS=4.5V 1 0 0 2 0 0 3 0 0 mV

Pin Assignment

LA5690S

U 1*1 IU H l*J 1*1 IzJ l«l liJ o v ) o 9 ifi

-z § r 2 o y r °

The NC pin, which is left open, must not be used for wiring. Equivalent Circuit Block Diagram

Unit (resistance: G )

Vcont

VS C| Ck

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Test Circuit 2sai2«

Timing Chart

Application of power

VCC

Digital output at I/O port of microcomputer Instantaneous drop w , d I Microcomputer operation start 1CKW —;.CPU -abnormality

Note : Edge-triggered at the point indicated by the arrow of CK signal. Sample Application Circuit

Unit (resistance: n.capac

2SA1289 VS- VR E FX ( + 1 ) VREf^M8(V) td= 1 0 x Ct( n F ) ( m s ] twD = 5 x Ct( p F ) [ m s ] tWR = 0.25XCt(nF)[ms] 777 TR1 Ct 2SA1289(6CIV/5A,TO-220) Sanyo OS capacitor Ct,C0 •Cck

. Capacitors whose value does not vary with temperature very much. : Must be used to eliminate noise in the reset output.

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Pd max - Ta V0 " VCC 0 20 40 60 ® 100 Ambient Temperature, Ta — °C VRES - V0 > I 5 IK bo B 1 2 O W W 4 S1 4 93 492 > I o > 491 Ta = 25 I0 = 50r Rj = lk R2 = 3.£ 3C nA r> j i Ta = 25 I0 = 50r Rj = lk R2 = 3.£ kfi

<

i 1

<

j Indeterminate operation / V 1 1 1 j t 1 2 3 4 Output Voltage,Vo - V V0 " Ta to B 4 9 0 Q4.W 4-88 Vcc = lo = 5 = 14V mA — — 6 - 0 5-8 5 6 5 4 5 2 5 0 4 8 4 6 4.4 4.2 4 0 - 6 0 - 4 0 - 2 0 0 20 40 60 80 100 Ambient Temperature, Ta - °C ICC - Ta VC C = 14V > I 4 o > a> U) q 3 3 "o > a O i j _{Ta = 25' C}C lo = 5mj

\/

- — 50mA 1 - — 300mA 2 3 4 5 6 7 8 9 10 II Supply Voltage,VcC — V VRES ~ V o 120 2 3 4 Output Voltage,Vo - V Ice ~ Vcc 100 o 80 c o 'J. _S'60 40 S 20 o 100 CO £ 90

J "

«T TO bo 5 GO _o o £40 _» - I * _a g io o A Ta Io = 2£ = 0 >°c

/

' 1

/

i, 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 Supply Voltage,Vc c - V lrej - f - 6 0 - 4 0 0 20 40 60 80 100 Ambient Temperature, Ta - °C 2 3 5 ₁₀₀ 2 3 5 I0= 50mA I0= 50mA 300r nA [ Cv V\ \ 1 1 t Ta = 25°C 8 j V^Vc cgl8V 3 = 50m A,300m A o = lOOpF C V^Vc cgl8V 3 = 50m A,300m A o = lOOpF 1k * 3 5 10k Frequency , f - H z 2 3 5 _100k

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td,twD - Ta VC C = 14V I0 = 5 mA I VC C = 14V I0 = 5 mA I ^ — ^ — -twD twD 0 6 tWR ~ T£ - 6 0 - 4 0 - 2 0 0 20 40 60 80 100 Ambient Temperature, Ta — °C VIN - Ta vCc = 10 = 5 = 14V 0mA 0 5 0) £ - 0 3 _v m

£

bo 0-2 o T3 -C « 0 . t £ vCc= Io = 5 = 14V mA 360 340

%

1 320 PC 300 a 0> Ld 260 3 <J ₂₆₀ =1 a 240 O ₂₂₀ 200 - 6 0 - 4 0 - 20 0 20 40 60 60 Ambient Temperature, Ta — CC llH " Ta 100 VC C = 14V = 50mA VCK= :5V - 6 0 - 40 - 20 0 20 40 60 60 100

Ambient Temperature, Ta - "C - 6 0 - 40 - 20 0 20 40 60 00 100 Ambient Temperature, Ta - °C

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