The bq24640 device is a highly integrated switched-mode super capacitor charge controller. The device offers a constant-frequency synchronous PWM controller with high accuracy charge current, voltage regulation, and charge status monitoring.

The bq24640 charges a super capacitor in two phases: constant current and constant voltage (CC/CV). The device can charge super capacitors from 0 V with current set on the ISET pin. When the super capacitor voltage reaches the programmed target voltage, charge current begins tapering down.

The bq24640 enters a low-current sleep mode
(<15 µA) when the input voltage falls below the output capacitor voltage.

The bq24640 has an input CE pin to enable and disable charge, and the STAT and PG output pins report charge and adapter status. The TS pin on the bq24640 monitors the temperature of the capacitor and suspends charge during hot and cold conditions.

• Charge Super Capacitor Pack From 2.1 V to 26 V
• CC/CV Charge Profile From 0 V Without Precharge
• 600-kHz NMOS-NMOS Synchronous Buck Controller
• Over 90% Efficiency for up to 10-A Charge Current
• 5-V to 28-V VCC Input Voltage Range
• Accuracy
  • ±0.5% Charge Voltage Regulation
  • ±3% Charge Current Regulation
• High Integration
  • Internal Loop Compensation
  • Internal Digital Soft Start
• Safety
  • Input Overvoltage Protection
  • Capacitor Temperature Sensing Hot and Cold Charge Suspend
  • Thermal Shutdown
• Status Outputs
  • Adapter Present
  • Charger Operation Status
• Charge Enable Pin
• 30-ns Driver Dead Time and 99.5% Maximum Effective Duty Cycle
• Automatic Sleep Mode for Low Power Consumption
  • <15-μA Off-State Super Capacitor Discharge Current
  • <1.5-mA Off-State Input Quiescent Current
• APPLICATIONS
  • Memory Backup Systems
  • Industrial UPS Systems and Power Transient Buffering
  • Bridge Power to Buffer the Battery

All other trademarks are the property of their respective owners

• Number of series cells
• 1, 2, 3, 4, 5, 6, 7, 8
• Charge current (Max) (A)
• 10
• Operating Vin (Max) (V)
• 28
• Cell chemistry
• SuperCap
• Battery charge voltage (Min) (V)
• 2.1
• Battery charge voltage (Max) (V)
• 26
• Absolute Vin (safety rating) (Max) ((V))
• 33
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile)
• Operating Vin (Min) (V)
• 5
• Rating
• Catalog

BQ24640的完整型号有：BQ24640RVAR、BQ24640RVAT，以下是这些产品的关键参数及官网采购报价：

BQ24640RVAR，工作温度：-40 to 85，封装：VQFN (RVA)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24640RVAR的批量USD价格：1.848（1000+）

BQ24640RVAT，工作温度：-40 to 85，封装：VQFN (RVA)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24640RVAT的批量USD价格：2.218（1000+）

BQ24640EVM — 用于 BQ24640 多节同步开关模式充电器的评估模块

bq24600/bq24620/bq24640 评估模块。bq2461x 是高度集成的锂离子或锂聚合物开关模式电池充电控制器。bq2463x 是高度集成的开关模式电池充电控制器，专为磷酸锂电池化学物充电而设计。bq24640 是高度集成的超级电容器开关模式充电控制器。它们可以为恒频同步 PWM 控制器提供高准确度充电电流和电压调节、适配器电流调节、终止、充电预处理和充电状态监控。bq24600/bq24620 (...)

bq246xx Calculation Tool V1.5 (Rev. D)

此参考设计使用 BQ24640 超级电容器充电控制器来为一大堆超级电容器充电，使这些电容器的电压低于输入总线电压。在输入总线压差期间，超级电容器的电量用于为升压转换器供电，可提 供 10A 的输出电流 (26.2V)。此输出电流可用于保持总线电压长达 10 秒（即保持 260W 10 秒）。