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Ordering number:ENN2895A
Monolithic Linear IC
LA5690D, 5690S
Voltage Regulator Driver with Watchdog Timer
Overview
The LA5690 is a single-chip voltage regulator for micro-
computer 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.
Package Dimensions
unit:mm
3001B-DIP8
[LA5690D]
85
Applications
• Microcomputer system for car equipment, refrigeration/
heating equipment, office automation equipment.
14
9.4
Functions
• Output voltage 5V control.
• 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 10k.
0.5 1.4
0.89 2.54
unit:mm
3017C-SIP9
[LA5690S]
22.3
1.5
SANYO : DIP8
3.0
1
0.99
2.54
0.5
9
1.3 0.25
1.35
SANYO : SIP9
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40500TN (KT)/D219YT/8099YT/9088YT, TS No.2895–1/6

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LA5690D, 5690S
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Symbol
Conditions
Ratings
Unit
Control pin voltage
Control pin voltage
Control pin current
CK input voltage
Reset pin voltage
Allowable power dissipation
VCONT max 1s
VCONT max
ICONT max *VCC6V
VCK max
VRES max,
VRES max
Pd max
60 V
41 V
11 mA
25 V
41 V
500 mW
Operating temperature
Storage temperature
Topr
Tstg
–40 to +85
–55 to +150
˚C
˚C
* : A PNP transistor is connected to the LA5690D, 5690S externally to provide a low-saturation voltage regulator.
Therefore, ICONT100mA will flow, as starting current, in the VCC range where the output cannot be regulated.
Operating Conditions at Ta = 25˚C
Parameter
Control pin voltage
Control pin current
Reset output current
Reset detection voltage
Symbol
VCONT
ICONT max
IRES max,
IRES max
VS min
External R pull-up
Conditions
Ratings
6 to 40
10
Unit
V
mA
8 mA
4V
Operating Characteristics at Ta = 25˚C, VCC=14V, IO=50mA, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min typ
Output voltage
Line regulation
Load regulation
Current drain
Output noise voltage
Temperature coefficient of output voltage
Reference voltage
H-level CK input voltage
L-level CK input voltage
H-level CK input current
L-level CK input current
H-level reset output voltage
L-level reset output voltage
L-level reset output voltage
CK input pulse width
Reset output delay time
Watchdog time
Watchdog reset time
Reset hysteresis voltage
VO
VOLN1
VOLN2
VOLD
ICC
VNO
VO/Ta
VREF
VIH
VIL
IIH
IIL
VORH/
VORH
VORL1/
VORL1
VORL2/
VORL2
tCKW
td
tWD
tWR
Vhys
9VVCC16V
6VVCC40V
1mAIO50mA
IO=0
10Hzf100kHz, VCK=0
IO=5mA, –40°CTa+85°C
VCK=5V
VCK=0
IRES=IRES=8mA
VCK=5V
Ct=1µF
Ct=1µF
Ct=1µF
VS=4.5V
4.8 5.0
2
4
4
4.9
200
±0.2
1.13 1.18
2
0.3
–1.0 –0.1
4.8 5.0
40
0.16
3
7.5 10
3.8 5.0
0.1 0.25
100 200
Unit
max
5.2 V
10 mV
30 mV
30 mV
6.5 mA
µV
mV/˚C
1.23 V
V
0.8 V
0.7 mA
µA
5.2 V
200 mV
0.8 V
µs
12.5 ms
6.2 ms
0.4 ms
300 mV
Pin Assignments
Top view
The NC pin, which is left open, must not be used for wiring.
No.2895–2/6

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Equivalent Circuit Block Diagram
LA5690D, 5690S
Test Circuit
The reset output contains a pull-up resistor of 10k.
Timing Chart
Note : Edge-triggered at the point indicated by the arrow of CK signal.
No.2895–3/6

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Sample Application Circuit
LA5690D, 5690S
· Ct, CO : Capacitors whose value does not vary with temperature very much.
· CCK : Must be used to eliminate noise in the reset output.
No.2895–4/6

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LA5690D, 5690S
No.2895–5/6