The TPS25846-Q1 is a USB Type-A BC1.2 charging solution that includes a synchronous DC/DC converter. With cable droop compensation, the Vbus voltage remains constant regardless of load current, ensuring connected portable devices are charged at optimal current and voltage even under heavy loads.

The TPS25846-Q1 includes high bandwidth analog switches for DP and DM pass-through. The device also integrates short to battery protection on V_BUS, DM_IN and DP_IN pins. These pins can withstand voltage up to 18 V.

The synchronous buck regulator operates with current mode control and is internally compensated to simplify design. A resistor on the RT pin sets the switching frequency between 300 kHz and 2.2 MHz. Operating below 400 kHz results in better system efficiency. Operation above 2.1 MHz avoids the AM radio bands and allows for use of a smaller inductor.

The TPS25846-Q1 integrates electrical signatures necessary for legacy devices which use USB data lines to determine charging configuration.

A precision current sense amplifier is included for user programmable cable droop compensation and current limit tuning. Cable compensation aids portable devices in charging at optimum current and voltage under heavy loads by changing the buck regulator output voltage linearly with load current to counteract the voltage drop due to wire resistance in automotive cabling. The VBUS voltage measured at a connected portable device remains approximately constant, regardless of load current, allowing the portable device’s battery charger to work optimally.

The USB specifications require current limiting of USB charging ports, but give system designers reasonable flexibility to choose overcurrent protection levels based on system requirements. The TPS25846-Q1 uses a novel two-threshold current limit circuit allowing system designers to either program average current limit protection of the buck regulator, or optionally, current limit using an external NMOS between the CSN/OUT and BUS pins. The NFET implementation enables the TPS25846-Q1 buck regulator to supply a 5-V output for other loads during an overcurrent condition on the USB port.

Protection features include cycle-by-cycle current limit, hiccup short-circuit protection, undervoltage lockout, VBUS overvoltage and overcurrent, data line (Dx) short to VBUS, and die overtemperature protection.

The TPS25846-Q1 includes high bandwidth analog switches for DP and DM pass-through, and support data line (Dx) short-to-VBAT protection.

• AEC-Q100 qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, TA
  • HBM ESD classification level H2
  • CDM ESD classification level C5
• Synchronous buck DC/DC regulator
  • Input voltage range: 4.5 V to 36 V
  • Output current: 3.5 A
  • 5.1-V output voltage with ±1% accuracy
  • Current mode control
  • Adjustable frequency: 300 kHz to 2.2 MHz
  • Frequency synchronization to external clock
  • FPWM with spread-spectrum dithering
  • Internal compensation for ease of use
• Compliant to USB-IF standards
  • CDP/SDP mode per USB BC1.2
• Optimized for USB power and communication
  • User-programmable USB current limit
  • Cable droop compensation up to 1.5 V
  • High bandwidth data switches on DP and DM
  • Client mode for system update
• Integrated protection
  • VBUS short-to-VBAT protection
  • DP_IN and DM_IN short-to-VBAT
  • DP_IN and DM_IN short-to-VBUS
  • DP_IN, DM_IN IEC 61000-4-2 rated
    • ±8-kV contact and ±15-kV air discharge
• Fault flag reports
• 32-pin QFN package with wettable flank

• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 36
• Continuous current (Max) (A)
• 3.5
• Current limit (A)
• User Selectable Current Limit
• Product type
• Charge port converter
• Operating temperature range (C)
• -40 to 125
• Enable
• Adjustable Enable Threshold
• Number of switches
• 1
• Rating
• Automotive

TPS25846-Q1的完整型号有：TPS25846QWRHBTQ1、TPS25846QCWRHBRQ1、TPS25846QWRHBRQ1，以下是这些产品的关键参数及官网采购报价：

TPS25846QWRHBTQ1，工作温度：-40 to 125，封装：VQFN (RHB)-32，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：SN，TI官网TPS25846QWRHBTQ1的批量USD价格：2.181（1000+）

TPS25846QCWRHBRQ1，工作温度：-40 to 125，封装：VQFN (RHB)-32，包装数量MPQ：5000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TPS25846QCWRHBRQ1的批量USD价格：1.935（1000+）

TPS25846QWRHBRQ1，工作温度：-40 to 125，封装：VQFN (RHB)-32，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：SN，TI官网TPS25846QWRHBRQ1的批量USD价格：1.935（1000+）

TPS25846Q1EVM-117 — TPS25846-Q1 USB BC1.2 synchronous buck evaluation module with cable compensation and client mode

TPS25846Q1EVM-117 是适用于 USB Type-A 5V 3.5A 输出、36V 输入同步降压器件的评估模块 (EVM)，具有电缆补偿功能。该 EVM 具有电源端子块和 USB Type-A 连接器，可进行器件充电和数据通信。电缆补偿、电流限制和开关频率可通过该 EVM 上的电阻器进行调节。

TPS25830-Q1 PSPICE Transient Ecrypted Model

此参考设计对 EMI 进行了优化，适用于具有 12W 单输出的汽车类 USB Type-A 充电器。TPS25846-Q1 可用作直流/直流稳压器和端口控制器。开关频率为 400kHz。前端滤波器和 PCB 布局经设计优化，符合严格的 CISPR 25 5 类传导电磁干扰 (EMI) 标准。此参考设计已通过 CISPR 25 5 类传导 EMI 标准测试，可缩短设计时间。