Battery Charger Li-Ion 2000mA 4.2V 24-Pin VQFN T/R, BQ24257RGER, Texas Instruments

The bq2425x is a highly integrated single-cell Li-Ion battery charger with integrated current sense resistor targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single input that operates from either a USB port or AC wall adapter for a versatile solution. BC1.2 compatible D+, D- detection allows for recognition of CDP, DCP, SDP, and non-standard USB adapters. The use of an accessory dead battery provision (DBP) pin allows for the system to sync a dead battery state in order to enable or disable the BC1.2 detection in the event of an external USB-PHI.The bq24257 has two modes of operation: 1) I2C mode, and 2) Standalone mode. In I2C mode, the host can adjust the charge parameters and monitor the status of the charger operation. In Standalone mode, the external resistor sets the input current limit, charge current limit, and the input DPM level. This mode also serves as the default settings when a DCP adapter is present. The bq24257 enters host mode while the I2C registers are accessed and the watchdog timer has not expired (if enabled).For all available packages, see the orderable addendum at the end of the datasheet.

High-efficiency Switch-mode Charger with Integrated Current Sense Resistor

BC1.2 D+, D– Detection with Dead Battery Provision (DBP) Pin-to-Sync with External USB-PHI

USB Charging Compliant

Selectable Input Current Limit of 100 mA,
150 mA, 500 mA, 900 mA. 1.5 A, and 2 A

Watchdog Timer with Disable Bit

Integrated 4.9-V, 50-mA LDO

Complete System Level Protection

Input UVLO, Input Overvoltage Protection (OVP), Battery OVP, Sleep Mode, V_{IN_DPM}
Input Current Limit
Charge Current Limit
Thermal Regulation and Thermal Shutdown
Voltage Based, JEITA Compatible NTC Monitoring Input
Safety Timer

In Host Mode, Programmable V_BATREG, I_CHG, I_LIM, V_{IN_DPM}, V_OVP and safety timer in host mode (after I²C Communication and Before Watchdog Timer Times Out)

In Standalone Mode, Resistor Programmable I_CHG, I_LIM, and V_{IN_DPM} in Standalone Mode (before I²C Communication and After Watchdog Timer Times Out)

20-V Maximum Input Voltage Rating

10.5-V Maximum Operating Input Voltage

Low R_DS(on) Integrated Sense Resistor for up to 2-A Charging Rate

Open Drain Status Outputs

Synchronous Fixed-frequency PWM Controller Operating at 3 MHz for Small Inductor Support

Robust Battery Detection Algorithm

Charge Time Optimizer for Improved Charge Times at any Given Charge Current

Характеристики

Battery_type	Li-Ion, Li-Pol, LiFePO4
Output_current	2 A
Supplier_package	VQFN
Specifications	http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=BQ24257&&fileType=pdf
Screening_level	Industrial
Schedule_b	8542390000
Product_dimensions	4.15(Max) x 4.15(Max) x 0.95(Max)
Pin_count	24
Output_voltage	4.2 V
Operating_supply_voltage	4.35 to 6.5 V
Бренд	Texas Instruments
Operating_temperature	-40 to 85 °C
Msl_level	2
Mounting	Surface Mount
Max_processing_temp	260
Lead_finish	Gold Over Nickel Palladium
Kind	Battery Charger
Htsn	8542390001
Eccn	EAR99
Country_of_origin	United States

Артикул: BQ24257RGER

Описание