Texas Instruments UC3906QTR, UC3906Q, UC3906N, UC3906J, UC3906DWTR Datasheet

UC2906
UC3906

Sealed Lead-Acid Battery Charger

FEATURES

• Optimum Control for Maximum
Battery Capacity and Life

• Internal State Logic Provides
Three Charge States

• Precision Reference T racks
Battery Requirements Over
Temperature

• Controls Both Voltage and
Current at Charger Output

• System Interface Funct ions

• Typical Standby Supply

Current of only 1.6mA

DESCRIPTION

The UC2906 series of batter y charger controllers contains all of the necessary
circuitry to optimally control the charge and hold cycle for s ealed lead-acid batter­ies. These integrated circuits monitor and control both the output voltage and cur­rent of the charger through three separate charge states; a high current
bulk-charge state, a controlled over-charge, and a precision float-charge, or
standby, state.

Optimum charging conditions are maintained over an extended temperature
range with an internal reference that tracks the nominal temperature charac­teristics of the lead-acid cell. A typical standby supply current requirement of only

1.6mA allows these ICs to predictably monitor ambient temperatures.
Separate voltage loop and current limit amplifiers regulate the output voltage and

current levels in the charger by controlling the onboard driver. The driver will sup­ply up to 25mA of base drive to an external pass device. Voltage and current
sense comparators are used to sense the battery condition and respond with
logic inputs to the charge state logic. A charge enable comparator with a trickle
bias output can be used to implement a low current turn-on mode of the charger,
preventing high curren t charging during abnormal conditions such as a shorted
battery cell.

Other features inclu de a su ppl y unde r-voltage sense circuit with a logic output to
indicate when input power is present. In addition the over-charge state of the
charger can be externa lly monitored and termin ated using the over-charge indi­cate output and over-charge terminate input.

BLOCK DIAGRA M

SLUS186 - SEPTEMBER 1996

CONNECTION DIAG RAMS

UC2906
UC3906

Supply Voltage (+ VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . 40V

Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . 40V

Amplifier and Comp arato r Input Voltages . . . -0.3V to +40V

Over-Charge Te rm inate I nput Volt age. . . . . . -0.3V to +40V

Current Sense Amplifier Output Cur ren t . . . . . . . . . . 80mA

Other Open Collector Output Currents. . . . . . . . . . . . 20mA

Trickle Bias Voltage Differe nt ial with res pect to V

IN. . . -32V

Trickle Bias Outpu t Current . . . . . . . . . . . . . . . . . . . . -40mA

Driver Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80mA

Power Dissipation at T

A = 25°C(Note 2) . . . . . . . . 1000mW

Power Dissipation at T

C = 25°C (Note 2). . . . . . . . 2000mW

Operating Junct ion Te mp era ture . . . . . . . . -55°C to +150°C

Storage Temperature . . . . . . . . . . . . . . . . . -65°C to +150°C

Lead Tempera ture (Solderin g, 10 Seconds) . . . . . . . 300°C

Note 1: Voltage s are reference d to ground (Pin 6) . Current s
are positive into, negat ive out of, the specif ied te rminals.
Note 2: Consult Packag in g sect ion of Dat abo ok f or ther ma l
limitations and considerat ions of packages .

DIL-16, SOIC- 16 (T O P VIEW)
J or N Package, DW Package

PACKAGE PIN FUNCTION

FUNCTION PIN

N/C 1
C/S OUT 2
C/S- 3
C/S+ 4
C/L 5
N/C 6
+VIN 7
GROUND 8
POWER INDICATE 9
OVER CHARGE

TERMINATE

10

N/C 11
OVER CHARGE

INDICATE

12

STATE LEVEL
CONTROL

13

TRICKLE BIAS 14
CHARGE ENABLE 15
N/C 16
VOLTAGE SENSE 17
COMPENSATION 18
DRIVER SOURCE 19
DRIVER SINK 20

PLCC-20, LCC-20
(TOP VIEW)
Q, L Packages

ABSOLUTE MAXI MUM RATING S (Note 1)

PARAMETER TEST CONDITIONS UC2906 UC3906 UNITS

MIN TYP MAX MIN TYP MAX

Input Supply

Supply Current +V

IN = 10V 1.6 2.5 1.6 2.5 mA

+V

IN = 40V 1.8 2.7 1.8 2.7 mA

Supply Under-Voltage Threshold +V

IN = Low to High 4.2 4.5 4.8 4.2 4.5 4.8 V

Supply Under-Voltage Hysteresis 0.20 0.30 0.20 0.30 V

Internal Reference (V

REF)

Voltage Level (Note 3) Measured as Regulating Level at

Pin 13 w/ Driver Current = 1mA,
T

J = 25°C

2.275 2.3 2.325 2.270 2.3 2.330 V

Line Regulation +V

IN = 5 to 40V 38 38mV

Temperature Coeff icient -3.9 -3.9 mV/°C

Voltage A m pl if ier

Input Bias Current Total Input Bias at Regulating Level -0.5 -0.2 -0.5 -0.2 µA
Maximum Output Current Source -45 -30 -15 -45 -30 -15 µA

Sink 30 60 90 30 60 90 µA
Open Loop Gain Driver current = 1mA 50 65 50 65 dB
Output Voltage Swing Volts above GND or below +V

IN 0.2 0.2 V

Unless otherwise st ated, these specif icat ions apply fo r T

A = -40°C to +70°C for the

UC2906 and 0°C to +70°C for the UC3906, +V

IN = 10V, TA = TJ.

ELECTRICAL CHARACTERISTICS:

Note 3. The referenc e volt age will change as a function of power dissipat ion on the die according t o the tem per ature coef ficie nt of
the reference and the t her mal resist anc e, junct ion-t o-am bient .

2

PARAMETER TEST CONDITIONS UC2906 UC3906 UNITS

MIN TYP MAX MIN TYP MAX

Driver

Minimum Supply to Source
Different ial

Pin 16 = +V

IN, IO = 10mA 2.0 2.2 2.0 2.2 V

Maximum Output Current Pin 16 to Pin 15 = 2V 25 40 25 40 mA
Saturation Voltage 0.2 0.45 0.2 0.45 V

Current Limit Amplifier

Input Bias Current 0.2 1.0 0.2 1.0 µA
Threshold Voltage Of f set below + V

IN 225 250 275 225 250 275 mV

Threshold Supply Sen sitivit y +V

IN = 5 to 40V 0.03 0.25 0.03 0.25 %/V

Voltage Sense Compar ator

Threshold Voltage As a func tion of V

REF, L1 = RESET 0.945 0.95 0.955 0.945 0.95 0.955 V/V

As a function of V

REF, L1 = SET 0.895 0.90 0.905 0.895 0.90 0.905 V/V

Input Bias Current Total Input Bias at Thresholds -0.5 -0.2 -0.5 -0.2 µA

Current Sense Comparato r

Input Bias Current 0.1 0.5 0.1 0.5 µA
Input Offs et Cu rr ent 0.01 0.2 0.01 0.2 µA
Input Offset Voltag e Referenced t o Pin 2, I

OUT = 1mA 202530202530mV

Offset Supply Sensitivity +V

IN = 5 to 40V 0.05 0.35 0.05 0.35 %/V

Offset Common Mode Sensitivity CM V = 2V to +V

IN 0.05 0.35 0.05 0.35 %/V

Maximum Output Current V

OUT = 2V 25 40 25 40 mA

Output Saturat io n Volta ge I

OUT = 10mA 0.2 0.45 0.2 0.45 V

Enable Comparator

Threshold Voltage As a func tion of V

REF 0.99 1.0 1.01 0.9 9 1.0 1.01 V/V

Input Bias Current -0.5 -0.2 -0.5 -0.2 µA
Trickle Bias Maximu m Outpu t

Current

V

OUT = +VIN − 3V 25 40 25 40 mA

Trickle Bias Maximu m Outpu t
Voltage

Volts below +V

IN, IOUT = 10mA 2.0 2.6 2.0 2.6 V

Trickle Bias Reverse Hold-Of f
Voltage

+V

IN = 0V, IOUT = -10µA 6.3 7.0 6.3 7.0 V

Over-Charg e Termi na te Inpu t

Threshold Voltage 0.7 1.0 1.3 0.7 1.0 1.3 V
Internal Pull-Up Current At Threshold 10 10 µA

Open Collector Outputs (Pins 7, 9, and 10)

Maximum Output Current V

OUT = 2V 2.5 5 2.5 5 mA

Saturation Voltage I

OUT = 1.6mA 0.25 0.45 0.25 0.45 V

I

OUT = 50µ A 0 .0 3 0.05 0.03 0.05 V

Leakage Curr ent V

OUT = 40V 13 13µA

ELECTRICAL CHARACTERISTICS:

Unless otherwise st ated, these specif icat ions apply fo r TA = -40°C to +70°C for the
UC2906 and 0°C to +70°C for the UC3906, +V

IN = 10V, TA = TJ.

UC2906
UC3906

3