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BQ2954SN Datasheet

  • BQ2954SN

  • Lithium Ion Charge Management IC with Integrated Switching C...

  • 173.06KB

  • 18頁(yè)

  • TI

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bq2954
Lithium Ion Charge Management IC
with Integrated Switching Controller
Features
鉃?/div>
Safe charge of Li-Ion battery
packs
鉃?/div>
Pulse-width modulation control
for current and voltage reg-
ulation
鉃?/div>
Programmable high-side/low-side
current-sense
鉃?/div>
Fast charge terminated by se-
lectable minimum current; safety
backup termination at maximum
time
鉃?/div>
Pre-charge qualification detects
shorted or damaged cells and
conditions battery
鉃?/div>
Charging continuously qualified
by temperature and voltage limits
鉃?/div>
Direct LED control outputs to
display charge status and fault
conditions
The bq2954 charges a battery in two
phases. First a constant-current
phase replenishes approximately
70% of battery capacity. Then a volt-
age-regulation phase completes the
battery charge.
The bq2954 provides status indica-
tions of all charger states and faults
for accurate determination of the
battery and charge-system condi-
tions.
General Description
The bq2954 Li-Ion Charge-Manage-
ment IC uses a flexible pulse-width
modulation regulator to control volt-
age and current during charging.
The regulator frequency is set by an
external capacitor for design flexi-
bility. The switch-mode design mini-
mizes power dissipation.
For safety, the bq2954 inhibits fast
charging until the battery voltage
and temperature are within config-
ured limits. If the battery voltage is
less than the low-voltage threshold,
the bq2954 provides low-current
conditioning of the battery.
For charge qualifiction, the bq2954
uses an external thermistor to mea-
sure battery temperature. Charging
begins when power is applied or the
battery is inserted
Pin Connections
Pin Names
TM
CHG
BAT
VCOMP
ICOMP
I
TERM
SNS
TS
Time-out programming
input
Charge active output
LCOM
Battery voltage input
V
SS
Voltage loop comp input
V
CC
5.0V鹵 10% power
Modulation control
output
Charge status output 1/
Charge sense select
input
Charge status output 2/
Display select input
Current loop comp input
MOD
Minimum current
termination select input
Sense resistor input
Temperature sense input
LED
2
/
DSEL
LED
1
/
CSEL
System ground
Common LED output
TPWM
BTST
Regulator timebase input
Battery test output
TM
CHG
BAT
VCOMP
ICOMP
ITERM
SNS
TS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LED2/DSEL
LED1/CSEL
MOD
VCC
VSS
LCOM
BTST
TPWM
16-Pin Narrow
DIP or SOIC
PN295401.eps
SLUS064鈥揙CTOBER 1998 B
1

BQ2954SN 產(chǎn)品屬性

  • 40

  • 集成電路 (IC)

  • PMIC - 電池管理

  • -

  • 充電管理

  • 鋰離子（Li-Ion）

  • 4.5 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC N

  • 管件

  • 296-9505-ND - EVAL MOD FOR BQ2954 LI-ION LO-SD296-9504-ND - EVAL MOD FOR BQ2954

  • 296-9388-5

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