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U2403B Datasheet

Charge Timer

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Charge Timer
U2403B
Description
The U2403B is a monolithic, integrated-bipolar circuit
which can be used in applications for time-controlled,
constant-current charge. Selection of charge current
versus timing is carried out by using the external circuit
at Pins 2, 3 and 4. For high current requirement, an
external transistor is recommended in series with the
battery. To protect the IC against high power loss
(typically > 140°C), the oscillator is shut down when the
reference voltage is switched off (0 V). The latter also
takes place when there is a saturation caused by collector
voltage at Pin 1. When the overtemperature has
disappeared and the collector voltage at Pin 1 has
exceeded the supply voltage (V1 > VS), charge time
operation continues (see flow chart in figure 3).
Features
D Easy-to-run autonomous dual rate charger
D Constant charge current
D 3 h – 24 h charge time programmable
D Low cost dc regulator
D Overtemperature protection
D Charge-mode indication
D Operation starts at the moment of battery insertion
D Fast charge time-test mode
Applications
D Cordless telephones
D Low-cost battery-charge timer
D Entertainment
Package: DIP8, SO8
Block Diagram
Power
supply
AC/DC
Battery
inserted
LED2
Charge
R1
R5
LED
LED1
Ready
8
C1
VS GND
67
94 8629
Charge mode
indicator
Power supply
VS = 3.5 to 12 V
Test
mode
5 STM
í max
140°C
1
V1
í
2
Shunt
Timer and control logic
VRef = 1.5 V/ 0.1 V/ 0 V
VRef
+
RC
oscillator
3
Sense
4
Osc
R3 R4
C4
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A2, 14–Nov–96
1 (12)
TEMIC Semiconductors
TEMIC Semiconductors



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