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BQ2031-BQ2031PN-A5-BQ2031SN-A5-BQ2031SN-A5TRG4
Lead-Acid Switchmode Charge Management IC With User-Selectable Charge Algorithms
Features Conformsto battery manufactur-
ers' charge recommendationsfor
cyclic and float charge Pin-selectable charge algorithms
Two-Step Voltage with
temperature-compensated
constant-voltage maintenance
Two-Step Current with
constant-rate pulsed current
maintenance
Pulsed Current: hysteretic,
on-demand pulsed current Pin-selectable charge termination maximum voltage,∆
2V, mini-
mum current, and maximum
time Pre-charge qualification detects
shorted, opened,or damaged cells
and conditions battery Charging continuously qualifiedby
temperature and voltage limits Internal temperature-compen-
sated voltagereference Pulse-width modulationcontrol
Ideal for high-efficiency
switch-mode power conversion
Configurable for linear or
gated current use Direct LED control outputs dis-
play charge status and fault con-
ditions
General DescriptionThe bq2031 Lead-Acid Fast Chargeis designedto optimize charging lead-acid chemistry batteries.A
flexible pulse-width modulation
regulator allows the bq2031to con-
trol constant-voltage, constant-
current,or pulsed-current charging.
The regulator frequencyissetbyan
external capacitor for design flexi-
bility. The switch-mode design keeps
power dissipationtoa minimumfor
high chargecurrent applications. charge cycle begins when poweris
appliedor the batteryis replaced.
For safety, chargingis inhibited un-
til the battery voltageis within con-
figured limits.Ifthe battery voltageis
less than the low-voltage threshold,
the bq2031 provides trickle-current
charging until the voltage rises into
the allowed rangeoran internal
timer runs out and places the
bq2031ina Fault condition. This
procedure prevents high-current
chargingof cells that are possibly
damagedor reversed. Chargingis
inhibited anytime the temperature the batteryis outside the config-
urable, allowed range. All voltage
thresholds are temperature-
compensated.
The bq2031 terminates fast (bulk)
charging based onthe following: Maximum voltage Seconddifferenceof cellvoltage2V) Minimum current(in constant-
voltage charging) Maximum time-out(MTO)
After bulk charging,the bq2031 pro-
vides temperature-compensated
maintenance (float) chargingto
maintainbattery capacity.
Lead-Acid Fast-Charge ICTMTO Time-out timebase input
FLOAT State control output
BAT Battery voltage input
VCOMP Voltage loop comp input
ICOMP Current loop comp input
IGSEL Current gain select input
SNS Sense resistor input Temperature sense input
TPWM Regulator timebase input
LED3/ Charge status output 3/
QSEL Charge algorithm select
input 1
COM Common LED output
VSS System ground
VCC 5.0V±10% power
MOD Modulation control
output
LED1/ Charge status output 1/
TSEL Charge algorithm select
input 2
LED2/ Charge status output 2/
DSEL Display select input
Pin Connections Pin NamesSLUS156–JUNE 1999 E
bq2031Not Recommended for New Designs (NRND)
