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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 36 Continuous current (Max) (A) 3.5 Current limit (A) User Selectable Current Limit Enable Adjustable Enable Threshold Number of switches 1 Rating Automotive open-in-new Find other USB power switches & charging port controllers

Package | Pins | Size

VQFN (RHB) 32 VQFN (RHB) 32 25 mm² 5 x 5 open-in-new Find other USB power switches & charging port controllers

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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, it also integrates short to battery protection on VBUS, 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 utilize 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.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet TPS25846-Q1 USB Type-A BC1.2 5-V 3.5-A Output, 36-V Input Synchronous Step datasheet (Rev. A) Oct. 12, 2020
More literature TPS25846Q1EVM-117 EU Declaration of Conformity (DoC) (Rev. A) Aug. 11, 2020
User guides TPS25846-Q1 Evaluation Module May 18, 2020
Application notes Ground Shift Phenomenon Recommendation of TPS2583x Dec. 02, 2019
Technical articles Automotive electronics design made easy Jul. 18, 2013
Technical articles John discusses benefits of LEDs in automobiles Jul. 16, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
75
Description
The TPS25846Q1EVM-117 are evaluation modules (EVM) for USB type-A 5-V 3.5-A output, 36-V input synchronous buck with cable compensation. The EVM has power terminal block, USB type-A connector for device charging and data communication. The cable compensation, current limit and switching frequency (...)
Features
The TPS25846Q1EVM-117 are evaluation modules (EVM) for USB type-A 5-V 3.5-A output, 36-V input synchronous buck with cable compensation. The EVM has power terminal block, USB type-A connector for device charging and data communication. The cable compensation, current limit and switching frequency (...)

Design tools & simulation

SIMULATION MODELS Download
SLVMD42.ZIP (203 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
CISPR 25 Class 5 400-kHz rated 12-W automotive USB Type-A charger reference design
PMP40725 — This reference design is an EMI-optimized design for automotive USB Type-A charger with single 12-W output. The TPS25846-Q1 is used as DC-DC regulator and port controller. The switching frequency is 400kHz. The front-end filter is designed and PCB layout is optimized to pass stringent CISPR 25 Class (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHB) 32 View options

Ordering & quality

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