Allegro ULQ2436M Datasheet
2436
COUNTDOWN POWER TIMER
2436
specifically designed to operate in an automotive or industrial environment. It uses an internal RC oscillator to drive a digital countdown
OSC.
GROUND
OUTPUT
TOGGLE
1
2
3
F/F
4
COUNTER
V
REG
8
MODE SELECT
NO
7
CONNECTION
NO
6
CONNECTION
5
SUPPLY
Dwg. No. PS-016
Dwg. No. PS-016
circuit for timing periods of typically 2-1/2 to 5 minutes. The
ULQ2436M multiplies the oscillator period by 4064. Internal logic can
automatically cause the timeout to be halved for successive timeouts.
I2L technology is used for the countdown and logic circuitry and
conventional linear bipolar devices for the oscillator and output power
functions. This combination, together with the low-cost 8-pin mini-DIP
plastic package, results in a very economical power timer suitable for a
wide variety of applications.
loads up to 400 mA.
COUNTDOWN POWER TIMER
The ULQ2436M is a rugged, long-duration countdown timer
The Darlington-connected output driver is capable of switching
Data Sheet
27462.20A
FEATURES
■ 28 V/400 mA Output Switch
■ Low-Cost Ceramic Timing Capacitor
■ Dual-Mode Timing Operation
■ -40°C to +85°C Operation
■ 10 V to 16 V Operation
■ Internal Stabilizing Regulator
■ Low-Cost 8-Pin Mini-DIP
APPLICATIONS
ABSOLUTE MAXIMUM RATINGS
at T
= +25°C
A
Supply Current, I
Output Voltage, V
Output Current, I
DISCONTINUED PRODUCT
Input Voltage, V
(continuous). . . . . . . . . . . . . . . . . 16 V
Package Power Dissipation,
P
Operating Temperature Range,
TA. . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature Range,
T
— FOR REFERENCE ONLY
. . . . . . . . . . . . . . . . . . . . See Graph
D
. . . . . . . . . . . . . . . -65°C to +150°C
S
. . . . . . . . . . . . 15 mA
REG
. . . . . . . . . . . . . 28 V
OUT
. . . . . . . . . . . 400 mA
OUT
or V4 (2 min.) . . . . . 24 V
1
■ Automotive Rear-Window Defogger Timer
■ Automotive Courtesy Light Timer
■ Appliance Power Timer
■ Power Control System
Always order by complete part number: ULQ2436M .
2436
COUNTDOWN POWER TIMER
2.0
R = 55°C/W
θJC
1.5
1.0
0.5
0
25
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
FREE AIR, R = 80°C/W
θJA
50 75 100 125 150
TEMPERATURE IN °C
Dwg. GP-009-1B
ELECTRICAL SPECIFICATIONS at T
(unless otherwise specified).
TEST CIRCUIT AND TYPICAL
REAR-WINDOW DEFOGGER APPLICATION
V
CC
R
T
1.5 MΩ
C
T
0.1 µF
65 Ω, 65 mH
TOGGLE
= -40°C to +85°C, V
A
10 kΩ
10 kΩ
R 1 kΩ
S
+
1 µF
C
S
1
2
COUNTER
3
24 V
45
= 12 V
CC
F/F
V
8
7
6
REG
Dwg. ES-012A
Limits
Characteristic Test Conditions Min. Max. Units
Regulator Voltage I
Output Saturation Voltage I
Output Leakage Current V
= 12 mA, Output Off 7.0 9.0 V
REG
= 400 mA, TA = +25°C — 2.5 V
OUT
I
= 250 mA, TA = +25°C — 1.35 V
OUT
= 28 V, VCC = 12 V — 100 µA
OUT
V
= 22 V, VCC = Open Circuit — 100 µA
OUT
Input Threshold Voltage 10 kΩ Series Resistor 1.0 5.0 V
Oscillator Tolerance T
Divider Count
(VCC = 10 V to 16 V)
= +25°C—±3.0 %
A
T
= -40°C to +85°C—±6.0 %
A
Initial Timeout 4064 4064 —
Subsequent Timeouts 2032 2032 —
115 Northeast Cutoff, Box 15036
W
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1987, 1993, Allegro MicroSystems, Inc.
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