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BQ24400P Datasheet

  • BQ24400P

  • Texas Instruments [Programmable NiCd/NiMH Fast-Charge Manag...

  • TI

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bq24400
Programmable NiCd/NiMH
Fast-Charge Management Device
Features
脴
Safe management of fast charge
for NiCd and NiMH battery
packs.
High-frequency switching con-
troller for efficient and simple
charger design
Pre-charge qualification for
detecting shorted, damaged, or
overheated cells
Fast-charge termination by
peak voltahge (PVD), maximum
temperature, and maximum
charge time
Selectable top-off mode for
achieving maximum capacity in
NiMH batteries
Programmable trickle-charge
mode for reviving deeply dis-
charged batteries and for post-
charge maintenance
Built-in battery removal and in-
sertion detection
Sleep mode for low power con-
sumption
General Description
The bq24400 is a programmable,
monolithic IC for fast-charge manage-
ment of nickel cadmium (NiCd) and
nickel metal-hydride (NiMH) batter-
ies.
The bq24400 provides a number of
charge termination criteria:
l
脴
脴
Peak voltage, PVD (for NiCd and
NiMH)
Maximum temperature
Maximum charge time
For safety, the bq24400 inhibits fast
charge until the battery voltage and
temperature are within user-defined
limits. If the battery voltage is below
t he l o w - v o l t a g e t h r es ho l d , t h e
bq24400 uses trickle-charge to
condition the battery. For NiMH
batteries, the bq24400 provides an
optional top-off charge to maximize
the battery capacity.
The integrated high-frequency com-
parator allows the bq24400 to be the
basis for a complete, high-efficiency
power-conversion circuit.
脴
l
l
脴
脴
脴
脴
Pin Connections
Pin Names
SNS
V
SS
Current-sense input
System ground
Charge-status
output
Battery-voltage
input
TS
RC
V
CC
MOD
Temperature-sense
input
Timer-program input
Supply-voltage input
Modulation-control
output
SNS
VSS
LED
BAT
1
2
3
4
8
7
6
5
MOD
VCC
RC
TS
LED
BAT
8-Pin DIP or Narrow SOIC
or TSSOP
PN-2000.eps
SLUS498 -SEPTEMBER 2001
1

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