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U2405B Datasheet

Fast Charge Controller for Drained NiCd/NiMH Batteries

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U2405B
Fast Charge Controller for Drained NiCd/NiMH Batteries
Description
The fast-charge battery controller circuit, U2405B, uses
bipolar technology. The IC enables the designer to create
an efficient and economic charge system. The U2405B
incorporates intelligent multiple-gradient battery-
voltage monitoring and mains phase control for power
management. With automatic top-off charging, the
Features
D Preformation algorithm for drained batteries
D Multiple gradient monitoring
D Temperature window (Tmin/Tmax)
D Exact battery voltage measurement without charge
D Phase control for charge-current regulation
D Top-off and trickle charge function
D Two LED outputs for charge status indication
D Disabling of d2V/dt2 switch-off criteria
during battery formation
D Battery-voltage check
18 (20) 17 (19) 16 (18)
14 (15)
integrated circuit ensures that the charge device stops
regular charging before the critical stage of overcharging
is achieved. It incorporates an additional algorithm for
reactivating fully drained batteries especially after long-
time storage. It has two LED driver indications for charge
and temperature status.
Applications
D Portable power tools
D Laptop/notebook personal computer
D Cellular/cordless phones
D Emergency lighting systems
D Hobby equipment
D Camcorder
Package: DIP18, SO20
13 (14)
12 (13) 11 (12)
4 (4)
1 (1)
Sync
ö
C
ö
R
Phase control
Vöi
Trigger output
Power - on control
VRef
6.5 V/10 mA
Oscillator
Control unit
Gradient
d2V/dt2 and –dV
15 (17)
2 (2)
Power supply
VS = 8 to 26 V
160 mV
Ref
Temp. control
Tmax Sensor
94 8585
5 (5) 6 (6)
7 (8) 8 (9)
Figure 1. Block diagram
Status control
Scan path
Battery
detection
VRef = 5 V
VBatt Monitor
0.1 to 4 V
3 (3)
10 (11)
Charge break
output
9 (10)
( ) SO 20, Pins 7 and 16 NC
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96
1 (17)
TEMIC Semiconductors
TEMIC Semiconductors



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