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Ordering number : ENA2085
LA5693D
LA5693MD
Monolithic Linear IC
Voltage Regulator Driver
with Watchdog Timer
http://onsemi.com
Overview
The LA5693D and LA5693MD 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. Since the LA5693D and LA5693MD
can hold the reset output, it is especially suited for use in peripheral control and monitor output applications (example:
valves used in refrigeration equipment, hot water supply system).
Features
An external PNP transistor can be used to provide a low-saturation voltage regulator.
Since the CK input has no edge detector, a high degree of flexibility is allowed in applications.
Variable detection voltage.
The watchdog time can be made longer.
Functions
Output voltage 5V control.
Watchdog timer.
Power-ON reset function.
Reset hold output [RES (2)] (Cleared with CK re-input).
Applications
Microcomputer system for car equipment, refrigeration/heating equipment, office automation equipment.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Control pin voltage
Symbol
VCONT max
1s
Conditions
Ratings
Unit
60 V
41 V
Control pin current
CK input voltage
Reset pin voltage
Allowable power dissipation
ICONT max
VCK max
V RES(1) max,
V RES(2) max
Pd max
LA5693D
11 mA
25 V
41 V
500 mW
LA5693MD
350 mW
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
* : A PNP transistor is connected to the LA5693D, LA5693M 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.
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
August, 2013
62012 SY 20120227-S00003 No.A2085-1/7

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LA5693D, LA5693MD
Operating Conditions at Ta = 25°C
Parameter
Control pin voltage
Control pin current
Reset output current
Reset detection voltage
Symbol
VCONT
ICONT max
V RES(1) max,
V RES(2) max
VS min
Conditions
External R pull-up
Ratings
6 to 40
10
8
Unit
V
mA
mA
4V
Electrical Characteristics at Ta = 25°C, VCC = 14V, IO=50mA, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min typ
Output voltage
VO
4.8 5.0
Line regulation1
Line regulation2
Load regulation
Current dissipation
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 1
‘L’-level reset output voltage 2
CK input pulse width
Reset output delay time
Watchdog time
Watchdog reset time
Reset hysteresis voltage
ΔVOLN1
ΔVOLN2
ΔVOLD
ICC
VNO
VO/ΔTa
VREF
VIH
VIL
IIH
IIL
V ORH(1)/
V ORH(2)
V ORL(1)1/
V ORL(2)1
V ORL(1)2/
V ORL(2)2
tCKW
td
tWD
tWR
Vhys
9V VCC 16V
6V VCC 40V
1mA IO 50mA
IO=0
10Hz f 100kHz, VCK = 0V
IO = 5mA, –40°C Ta +85°C
VCK = 5V
VCK = 0V
RES(2): 10kΩ pull-up
RES(2): 10kΩ pull-up
I RES(1) = I RES(2) = 8mA
VCK = 5V
Ct = 1μF
Ct = 1μF
Ct = 1μF
VS = 4.5V
1.13
2
-1.0
4.8
3
7.5
30
0.1
100
2
4
4
4.4
150
±0.2
1.18
0.3
-0.1
5.0
40
0.16
10
40
0.25
200
max
5.2
5
30
30
6.5
Unit
V
mV
mV
mV
mA
μV
mV/°C
1.23
0.8
0.7
5.2
V
V
V
mA
μA
V
200 mV
0.8 V
12.5
50
0.4
300
μs
ms
ms
ms
mV
No.A2085-2/7

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Package Dimensions
unit : mm (typ)
3001D
9.14
85
LA5693D, LA5693MD
[LA5693D]
Package Dimensions
unit : mm (typ)
3424
[LA5693MD]
4.9
8
1
1.0
4
1.4
12
1.27
0.42 0.2
(0.76) 2.54
0.5
SANYO : DIP8(300mil)
Pin Assignment
Block Diagram
VCONT 1
8 CK
RES(2) 2 LA5693D 7 Ct
VO 3 LA5693MD 6 RES(1)
GND 4
5 VS
(Top view)
VCONT VO
Starter VREF
Error
amp
Reset
generator
WDT
Voltage detector
VS CK
Ct
RES(1) : Contains a pull-up resistor of 10kΩ.
RES(2) : Open collector.
SANYO : SOIC8
RES(1)
RES(2)
GND
No.A2085-3/7

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Test Circuit
LA5693D, LA5693MD
VCC
+
Cin
10μF
TR1
R8
390Ω
VCONT VO
VS
LA5693
RES(1)
RES(2)
CK
GND
Ct
+
Ct
+
Co
100μF
R1
VO
R2
CCK
0.01μF
Application Circuit Example
VCC
+ Cin
10μF
2SA1289
TR1
R8
390Ω
VCONT VO
TR2
2SA1258
D1
DS13SE
R6
1.1kΩ
R7
2.2kΩ
TR3
2SC3331
VS
R3
10kΩ
LA5693
R4 RES(1)
1kΩ
RES(2)
CK
R5
750Ω
GND
Ct
+
Ct
+ Co
100μF
R1
VDD
R2
CPU
RES
DO
CCK
0.01μF
VSS
VS=VREF ×
R1
R2
+
1
VREF1.18[V]
td=10×Ct(μF) [ms]
tWD=40×Ct(μF) [ms]
tWR=0.25×Ct(μF) [ms]
VO
No.A2085-4/7

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LA5693D, LA5693MD
Note on application
1. For stable operation, place Cin, CO, and TR1 as near to the IC as possible.
2. When used in 0°C or below it, a capacitor of which impedance at high-frequency operation is low and has a good
temperature characteristic should be used to prevent oscillation.
3. Set VS to the output voltage level where the circuit will be reset using external resistors R1 and R2. VS should be set
to 4V or greater due to internal circuit operation.
4. CCK must be inserted to cut the high range element of clock noise to prevent it from becoming a reset output noise.
5. For Ct, a capacitor which less varies the capacitance according to the temperature should be used.
Timing Chart
Application of power
VCC
0
5V
VS
VO 0
4V
2V
Ct 0
RES(1) 0
Vhys
Instantaneous drop
RES(2) 0
0
CK
Digital output at I/O
port of microcomputer
td
Microcomputer
operation start
tCKW tWD tWR
CPU
abnormality
td
Note : Edge-triggered at the point indicated by the arrow of CK signal.
No.A2085-5/7