U2405B
| Model | U2405B |
| Description | Fast Charge Controller for Drained NiCd/NiMH Batteries |
| PDF file | Total 17 pages (File size: 313K) |
| Chip Manufacturer | TEMIC |
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
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.
Features
D
D
D
D
D
D
D
D
Preformation algorithm for drained batteries
Multiple gradient monitoring
Temperature window (T
min
/T
max
)
Exact battery voltage measurement without charge
Phase control for charge-current regulation
Top-off and trickle charge function
Two LED outputs for charge status indication
Disabling of d
2
V/dt
2
switch-off criteria
during battery formation
Applications
D
Portable power tools
D
Laptop/notebook personal computer
D
Cellular/cordless phones
D
Emergency lighting systems
D
Hobby equipment
D
Camcorder
D
Battery-voltage check
18 (20) 17 (19)
16 (18)
14 (15)
Package:
DIP18, SO20
13 (14)
12 (13)
11 (12)
Sync
ö
C
ö
R
V
Ref
6.5 V/10 mA
Oscillator
Status control
3 (3)
Phase control
V
ö
i
4 (4)
Scan path
1 (1)
Trigger output
Control unit
Gradient
d
2
V/dt
2
and –dV
Battery
detection
V
Ref
= 5 V
10 (11)
V
Batt
Monitor
0.1 to 4 V
Power - on control
15 (17)
2 (2)
Power supply
V
S
= 8 to 26 V
160 mV
Ref
Temp. control
Sensor
T
max
Charge break
output
94 8585
5 (5)
6 (6)
7 (8)
8 (9)
9 (10)
( ) SO 20, Pins 7 and 16 NC
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96
1 (17)
