UC2909-EP Series

Enhanced Product Switch-mode Lead-Acid Battery Charger with Differential Current Sense

Catalog

Enhanced Product Switch-mode Lead-Acid Battery Charger with Differential Current Sense

Part	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case [y]	Package / Case [y]	Battery Chemistry	Mounting Type	Voltage - Supply (Max) [Max]	Supplier Device Package	Current - Charging	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case
Texas Instruments UC2909MDWREP	125 °C	-55 °C	20-SOIC	0.295 in	7.5 mm	Lead Acid	Surface Mount	40 V	20-SOIC	Constant - Programmable
Texas Instruments UC2909DWTR			20-SOIC	0.295 in	7.5 mm	Lead Acid	Surface Mount	40 V	20-SOIC	Constant - Programmable	85 °C	-40 °C
Texas Instruments UC2909N			20-DIP			Lead Acid	Through Hole	40 V	20-PDIP	Constant - Programmable	85 °C	-40 °C	7.62 mm	0.3 in
Texas Instruments UC2909DW			20-SOIC	0.295 in	7.5 mm	Lead Acid	Surface Mount	40 V	20-SOIC	Constant - Programmable	85 °C	-40 °C
Texas Instruments UC2909DWTRG4			20-SOIC	0.295 in	7.5 mm	Lead Acid	Surface Mount	40 V	20-SOIC	Constant - Programmable	85 °C	-40 °C

Catalog

Enhanced Product Switch-mode Lead-Acid Battery Charger with Differential Current Sense

Key Features

• Accurate and Efficient Control of Battery ChargingAverage Current Mode Control from Trickle to OverchargeResistor Programmable Charge CurrentsThermistor Interface Tracks Battery Requirements Over TemperatureOutput Status Bits Report on Four Internal Charge StatesUndervoltage Lockout Monitors VCC and VREFAPPLICATIONSControlled BaselineOne Assembly/Test SiteOne Fabrication SiteAvailable in Military (–55°C/125°C) Temperature Range(1)Extended Product Life CycleExtended Product-Change NotificationProduct TraceabilityNot to Exceed 185.35-KHz Oscillation Frequency at 125°C(1)Additional temperature ranges available - contact factoryAccurate and Efficient Control of Battery ChargingAverage Current Mode Control from Trickle to OverchargeResistor Programmable Charge CurrentsThermistor Interface Tracks Battery Requirements Over TemperatureOutput Status Bits Report on Four Internal Charge StatesUndervoltage Lockout Monitors VCC and VREFAPPLICATIONSControlled BaselineOne Assembly/Test SiteOne Fabrication SiteAvailable in Military (–55°C/125°C) Temperature Range(1)Extended Product Life CycleExtended Product-Change NotificationProduct TraceabilityNot to Exceed 185.35-KHz Oscillation Frequency at 125°C(1)Additional temperature ranges available - contact factory

Description

The UC2909 controls lead acid battery charging with a highly efficient average current mode control loop. This chip combines charge state logic with average current PWM control circuitry. Charge state logic commands current or voltage control depending on the charge state. The chip includes undervoltage lockout circuitry to insure sufficient supply voltage is present before output switching starts. Additional circuit blocks include a differential current sense amplifier, a 1.5% voltage reference, a –3.9-mV/°C thermistor linearization circuit, voltage and current error amplifiers, a PWM oscillator, a PWM comparator, a PWM latch, charge state decode bits, and a 100-mA open collector output driver. The UC2909 controls lead acid battery charging with a highly efficient average current mode control loop. This chip combines charge state logic with average current PWM control circuitry. Charge state logic commands current or voltage control depending on the charge state. The chip includes undervoltage lockout circuitry to insure sufficient supply voltage is present before output switching starts. Additional circuit blocks include a differential current sense amplifier, a 1.5% voltage reference, a –3.9-mV/°C thermistor linearization circuit, voltage and current error amplifiers, a PWM oscillator, a PWM comparator, a PWM latch, charge state decode bits, and a 100-mA open collector output driver.