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 Tracks Battery Requirements Over Temperature

∙Controls Both Voltage and Current at Charger Output

∙System Interface Functions

∙Typical Standby Supply Current of only 1.6mA

DESCRIPTION

The UC2906 series of battery charger controllers contains all of the necessary circuitry to optimally control the charge and hold cycle for sealed 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 current charging during abnormal conditions such as a shorted battery cell.

Other features include a supply under-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 externally monitored and terminated using the over-charge indicate output and over-charge terminate input.

BLOCK DIAGRAM

SLUS186 - SEPTEMBER 1996

UC2906

UC3906

ABSOLUTE MAXIMUM RATINGS (Note 1)

CONNECTION DIAGRAMS

Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . 40V Amplifier and Comparator Input Voltages . . . -0.3V to +40V Over-Charge Terminate Input Voltage . . . . . . -0.3V to +40V Current Sense Amplifier Output Current . . . . . . . . . . 80mA Other Open Collector Output Currents. . . . . . . . . . . . 20mA Trickle Bias Voltage Differential with respect to VIN. . . -32V Trickle Bias Output Current . . . . . . . . . . . . . . . . . . . . -40mA Driver Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80mA Power Dissipation at TA = 25°C(Note 2) . . . . . . . . 1000mW Power Dissipation at TC = 25°C (Note 2) . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . -55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 Seconds) . . . . . . . 300°C

Note 1: Voltages are referenced to ground (Pin 6). Currents are positive into, negative out of, the specified terminals. Note 2: Consult Packaging section of Databook for thermal limitations and considerations of packages.

DIL-16, SOIC-16 (TOP VIEW)

J or N Package, DW Package

PLCC-20, LCC-20 (TOP VIEW)

Q, L Packages
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	10
TERMINATE
N/C	11
OVER CHARGE	12
INDICATE
STATE LEVEL	13
CONTROL
TRICKLE BIAS	14
CHARGE ENABLE	15
N/C	16
VOLTAGE SENSE	17
COMPENSATION	18
DRIVER SOURCE	19
DRIVER SINK	20

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -40°C to +70°C for the UC2906 and 0°C to +70°C for the UC3906, +V IN = 10V, TA = TJ.

PARAMETER	TEST CONDITIONS		UC2906			UC3906		UNITS
		MIN	TYP	MAX	MIN	TYP	MAX
Input Supply
Supply Current	+VIN = 10V		1.6	2.5		1.6	2.5	mA
	+VIN = 40V		1.8	2.7		1.8	2.7	mA
Supply Under-Voltage Threshold	+VIN = 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 (VREF)
Voltage Level (Note 3)	Measured as Regulating Level at	2.275	2.3	2.325	2.270	2.3	2.330	V
	Pin 13 w/ Driver Current = 1mA,
	TJ = 25°C
Line Regulation	+VIN = 5 to 40V		3	8		3	8	mV
Temperature Coefficient			-3.9			-3.9		mV/°C
Voltage Amplifier
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 +VIN		0.2			0.2		V

Note 3. The reference voltage will change as a function of power dissipation on the die according to the temperature coefficient of the reference and the thermal resistance, junction-to-ambient.

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UC2906

UC3906

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -40°C to +70°C for the UC2906 and 0°C to +70°C for the UC3906, +V IN = 10V, TA = TJ.

PARAMETER	TEST CONDITIONS		UC2906			UC3906		UNITS
		MIN	TYP	MAX	MIN	TYP	MAX
Driver
Minimum Supply to Source	Pin 16 = +VIN, IO = 10mA		2.0	2.2		2.0	2.2	V
Differential
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	Offset below +VIN	225	250	275	225	250	275	mV
Threshold Supply Sensitivity	+VIN = 5 to 40V		0.03	0.25		0.03	0.25	%/V
Voltage Sense Comparator
Threshold Voltage	As a function of VREF, L1 = RESET	0.945	0.95	0.955	0.945	0.95	0.955	V/V
	As a function of VREF, 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 Comparator
Input Bias Current			0.1	0.5		0.1	0.5	μA
Input Offset Current			0.01	0.2		0.01	0.2	μA
Input Offset Voltage	Referenced to Pin 2, IOUT = 1mA	20	25	30	20	25	30	mV
Offset Supply Sensitivity	+VIN = 5 to 40V		0.05	0.35		0.05	0.35	%/V
Offset Common Mode Sensitivity	CMV = 2V to +VIN		0.05	0.35		0.05	0.35	%/V
Maximum Output Current	VOUT = 2V	25	40		25	40		mA
Output Saturation Voltage	IOUT = 10mA		0.2	0.45		0.2	0.45	V
Enable Comparator
Threshold Voltage	As a function of VREF	0.99	1.0	1.01	0.99	1.0	1.01	V/V
Input Bias Current		-0.5	-0.2		-0.5	-0.2		μA
Trickle Bias Maximum Output	VOUT = +VIN − 3V	25	40		25	40		mA
Current
Trickle Bias Maximum Output	Volts below +VIN, IOUT = 10mA		2.0	2.6		2.0	2.6	V
Voltage
Trickle Bias Reverse Hold-Off	+VIN = 0V, IOUT = -10μA	6.3	7.0		6.3	7.0		V
Voltage
Over-Charge Terminate Input
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	VOUT = 2V	2.5	5		2.5	5		mA
Saturation Voltage	IOUT = 1.6mA		0.25	0.45		0.25	0.45	V
	IOUT = 50μA		0.03	0.05		0.03	0.05	V
Leakage Current	VOUT = 40V		1	3		1	3	μA

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