LP4034QVF

The LP4034 is a standalone 1-cell switching battery charger providing up to 3.5A charge current to the battery from 4.1V to 6.2V input voltage. The charge current is programmable by a resistor connected from ISSET to GND and the charge voltage is programmable by a resistor connected from VSET to GND. The charge can be enabled and disabled from ISET pin. The LP4034 operates at 1.2MHz switching frequency allowing a small-size 1uH inductor for 3.5A fast charging. The patent-protected integrated current sensing technique eliminates external sensing resistor allowing very high charge efficiency, low BOM cost and small footprint. The precharge, fastcharge and termination current accuracy is competitive compared to external-resistor-based current sensing architecture. LP4034 is available in DFN3x3-10 package. The LP4034 is a highly-integrated switching charger for 1-cell Li-Ion and Li-Polymer batteries. The charge voltage is set by an external resistor connected from VSET pin to GND and the charge current is set by an external resistor connected from ISET pin to GND. The charge current is programmable up to 3.5A. To initiate a charge cycle, the conditions of charger power-up must be met. The device charges battery in four modes: trickle charge, pre-charge, Constant Current (CC) charge, and Constant Voltage (CV) charge. The charger terminates the charge cycle when the charge current is below termination threshold ITERM and charge voltage is above recharge threshold. When a fully charged battery's voltage is discharged below recharge threshold, the device automatically starts a new charging cycle and safety timer starts counting. The STAT pin output indicates the charging status of charging, charging complete or charge disabled or charging faults. Charge safety timer is built in to enhance the charger’s safety features.

Applications

• Portable battery powered devices
• Gaming devices
• Charging docks and cradles
• E-Cigarette

Key features

• Easy-to-use standalone high-efficieency 1-cell switching charger
• Proprietary sensorless technique
• 4.1V to 6.2V input voltage with 28V absolute maximum input voltage rating
• Resistor programmable charge voltages 4.1V/4.2V/4.25V/4.35V
• 3.5A maximum fast charge current
• 1.2MHz switching frequency
• 94% high efficiency @ VBAT = 3.8V, ICHG = 2A
• 91% high efficiency @ VBAT = 3.8V, ICHG = 3A
• Input voltage regulation to allow weak input power source to charge battery (VINDPM)
• Support trickle charge, precharge, Constant Current (CC) charge and Constant Voltage (CV) charge, charge termination and recharge
• High charge accuracy
• +/- 0.5% charge voltage regulation
• +/- 6% charge current regulation
• High integration
• Integrated all MOSFETs
• Internal loop compensation
• Internal bootstrap diode
• LED charge indication driver
• Cycle-by-cycle current limit protection
• Input under-voltage lockout (UVLO)
• Input over-voltage protection (OVP)
• Cold/hot battery temperature monitoring
• Junction temperature thermal regulation
• Charge safety timer
• Packaging: DFN3x3-10
• RoHS compliant and halogen free
• 100% lead (Pb) free