U2403B

Manufacturer Part NumberU2403B
ManufacturerATMEL Corporation
U2403B datasheet
 
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Charge Timer
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
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
Block Diagram
LED
Power
Battery
supply
Charge
inserted
AC/DC
V
Figure 1. Block diagram with external circuit
Rev. A3, 08-Nov-99
(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 (V
operation continues (see flow chart in figure 4).
Applications
D
Cordless telephones
D
Low-cost battery-charge timer
D
Entertainment
C
1
R
1
2
LED
R
1
5
Ready
V
GND
LED
S
6
8
Power supply
Charge mode
indicator
V
= 3.5 to 12 V
S
í
Timer and control logic
max
140 C
V
= 1.5 V/ 0.1 V/ 0 V
Ref
V
Ref
1
+
í
1
2
3
Shunt
Sense
R
3
U2403B
> V
), charge time
1
S
7
5
S
Test
TM
mode
RC
oscillator
4
Osc
R
4
C
4
1 (12)

U2403B Summary of contents