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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Texas Instruments BQ24257RGET

Name: BQ24257RGET
Brand: Texas Instruments
SKU: BQ24257RGET
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ24257RGET

Manufacturer:: Texas Instruments

Category:: Battery Chargers

Package:: 24-VFQFN Exposed Pad

Datasheet:: BQ24257RGET.pdf

Description:: IC BAT CHG MULT-CHEM 1CEL 24VQFN

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Product details

Overview

BQ24257RGET from Texas Instruments is a 2-A single-input I²C/standalone switch-mode Li-ion battery charger with integrated current-sense resistor, 3-MHz synchronous PWM controller, and BC1.2 D+/D− detection. It supports USB and AC adapter inputs, delivers up to 2 A charge current, and includes JEITA-compatible NTC monitoring via TS pin for safe charging in mobile phones and handheld devices.

For engineers reviewing the BQ24257RGET datasheet, BQ24257RGET pinout, BQ24257RGET application, or BQ24257RGET equivalent, key selection criteria include its dual I²C/standalone operation mode, programmable input current limit (100 mA–2 A), 4.2-V battery regulation accuracy (±0.5% at 25°C), integrated 4.9-V/50-mA LDO, and 24-pin QFN (4.15 mm × 4.15 mm) package with thermal pad.

Technical Context

The BQ24257RGET implements a fixed-frequency 3-MHz synchronous buck converter with integrated high-side and low-side MOSFETs (RON(HS) = 100–150 mΩ, RON(LS) = 110–165 mΩ) and internal current-sense resistor (RSNS = 20–30 mΩ for WCSP, 30–40 mΩ for QFN). Its dual-mode architecture allows host-controlled configuration via I²C (address 0x6A) or resistor-programmed standalone operation using ISET, ILIM, and VDPM pins.

It integrates BC1.2-compliant D+/D− detection with dead-battery provision (DBP) sync, voltage-based JEITA thermistor monitoring (four thresholds: VHOT, VWARM, VCOOL, VCOLD), and comprehensive protection including input UVLO (3.15–3.5 V), OVP (10.5 V max), battery OVP (105% of VBATREG), thermal regulation (125°C), and safety timer (45/360/540 min).

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Current	Programmable 500–2000 mA; ±7% accuracy ensures precise fast-charge control without external sense resistor.
Input Voltage Range	4.35–6.5 V operating range; 20-V absolute max rating enables robust handling of transient spikes on USB/adapter inputs.
Battery Regulation	4.2 V nominal Li-ion output; ±0.5% accuracy at 25°C and ±0.75% over –40°C to +125°C ensures stable cell voltage during CV phase.
Oscillator Frequency	3 MHz (2.7–3.3 MHz typical); enables use of small 1-µH inductors and reduces output ripple in space-constrained layouts.
LDO Output	4.9 V ±0.3 V at up to 50 mA; powers auxiliary circuitry (e.g., PMIC bias, USB PHY) without requiring external regulator.
Thermal Regulation	Activates at 125°C junction temperature; linearly reduces charge current to prevent thermal runaway during sustained high-power operation.
TS Input Thresholds	Four JEITA-compliant thresholds (VHOT = 30% VLDO, VWARM = 38.3% VLDO, VCOOL = 56.7% VLDO, VCOLD = 60% VLDO) enable precise battery temperature zone control.

Pinout & Package

Package: 24-pin QFN (RGE), 4.15 mm × 4.15 mm body size, exposed thermal pad (PGND-connected). Compatible with standard reflow profiles and supports high-power dissipation via bottom-side thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
IN	Input power supply	Accepts 4.35–6.5 V from USB or AC adapter; requires ≥2-μF ceramic bypass to PGND for stability.
SW	Switch node	Connects to inductor; carries high-frequency switching current; layout critical for EMI and efficiency.
BOOT	High-side gate driver supply	Requires 33-nF ceramic capacitor to SW; supplies gate drive for internal high-side MOSFET.
CSIN	System output voltage sense	Monitors system rail (e.g., PMIC input); bypassed with ≥1-μF capacitor for accurate DPM and regulation.
BAT	Battery connection	Direct connection to Li-ion anode; bypassed with ≥20-μF capacitor to suppress charge ripple and improve stability.
TS	NTC thermistor monitor	Four-threshold JEITA interface; connects to center tap of LDO–GND divider with NTC to GND for battery temperature safety.
ISET	Charge current programming	Resistor-to-GND sets ICHG (KISET = 250 AΩ); short to GND defaults to 2-A max charge current.
ILIM	Input current limit programming	Resistor-to-GND sets ILIM (KILIM = 270 AΩ); short to GND defaults to 2-A input limit.
VDPM	Input DPM threshold programming	Resistor divider from IN to GND sets VIN_DPM (1.2-V reference); short to GND defaults to 4.68 V.
/CE	Charge enable (active-low)	Pulling high disables charging and places device in standby; draws only 5 µA quiescent current.
STAT	Status open-drain output	Indicates charging (low), completion (high-Z), or faults (256-µs pulse); configurable via EN_STAT bit.
/PG	Power good open-drain output	Pulled low when valid input (VBAT + VSLP < VIN < VOVP) is present; used for system power sequencing.
SCL/SDA	I²C interface	Supports host configuration of VBATREG, ICHG, ILIM, VIN_DPM, VOVP, and safety timer; address 0x6A.
D+/D−	BC1.2 adapter detection	Identifies SDP/CDP/DCP and Apple/TomTom adapters; enables DBP sync for dead-battery boot.
LDO	Integrated LDO output	4.9-V regulated output driving up to 50 mA; enabled when 3.15 V < VIN < 19 V; bypassed with 1-μF ceramic cap.

Key Features

Feature	Design Value
Integrated current-sense resistor	Eliminates external 5-mΩ sense resistor, reducing BOM count and PCB area while maintaining ±7% ICHG accuracy.
3-MHz synchronous PWM	Enables use of compact 1-µH inductors and reduces output capacitance requirements versus lower-frequency chargers.
BC1.2 D+/D− detection with DBP sync	Automatically identifies USB source type and coordinates with host to enable charging from dead-battery state.
I²C + standalone dual-mode operation	Allows flexible deployment: full host control via registers or resistor-programmed default settings for cost-sensitive designs.
Voltage-based JEITA NTC monitoring	Four precision thresholds (±1% tolerance) replace analog comparator circuits, enabling compliant thermal zone management without external ICs.
Integrated 4.9-V/50-mA LDO	Provides clean, regulated bias for USB PHY, PMIC, or microcontroller peripherals-reducing need for discrete LDOs.

Applications

Smartphone Power Management	USB-C Portable Media Player
Use Scenario: Charging a 3.7-V/3000-mAh Li-ion battery from USB 2.0 port or 5-V wall adapter in a slim smartphone chassis. IC Role / Device Role / Timing Role: Primary battery charger managing trickle/pre-charge/CC/CV phases; regulates system voltage (CSIN) and monitors battery temperature (TS) in real time. Use Value: Achieves full charge in <2.5 hours at 2 A while maintaining ±0.5% VBATREG accuracy and preventing thermal shutdown via 125°C regulation.	Use Scenario: Enabling rapid charging and system power path management in a portable media player with USB OTG support. IC Role / Device Role / Timing Role: Dual-role power manager: charges battery while simultaneously powering USB peripherals via PMID and LDO outputs. Use Value: Delivers 50 mA from integrated LDO to USB PHY and uses BC1.2 detection to auto-configure 900-mA input limit for CDP compliance.
Handheld Industrial Scanner	Bluetooth Headset with Fast Charge
Use Scenario: Recharging a ruggedized barcode scanner's Li-ion pack in field-deployed environments with mixed USB/AC sources. IC Role / Device Role / Timing Role: Robust charger with VIN_DPM (programmed to 4.4 V) to sustain charging under weak USB ports; uses watchdog timer to recover from host lockup. Use Value: Maintains >85% efficiency at 1-A load across 5–7 V input range and prevents false battery removal detection via AnyBoot algorithm.	Use Scenario: Supporting 15-minute fast charge capability in a compact Bluetooth headset with thermal constraints. IC Role / Device Role / Timing Role: High-efficiency charger with 3-MHz switching minimizing inductor size; JEITA monitoring disables charging below 0°C or above 45°C. Use Value: Enables 60% battery recovery in 15 minutes using 1.5-A ICHG while staying within 85°C junction limit via thermal regulation.

Smartphone Power Management

USB-C Portable Media Player

Use Scenario: Charging a 3.7-V/3000-mAh Li-ion battery from USB 2.0 port or 5-V wall adapter in a slim smartphone chassis.

IC Role / Device Role / Timing Role: Primary battery charger managing trickle/pre-charge/CC/CV phases; regulates system voltage (CSIN) and monitors battery temperature (TS) in real time.

Use Value: Achieves full charge in <2.5 hours at 2 A while maintaining ±0.5% VBATREG accuracy and preventing thermal shutdown via 125°C regulation.

Use Scenario: Enabling rapid charging and system power path management in a portable media player with USB OTG support.

IC Role / Device Role / Timing Role: Dual-role power manager: charges battery while simultaneously powering USB peripherals via PMID and LDO outputs.

Use Value: Delivers 50 mA from integrated LDO to USB PHY and uses BC1.2 detection to auto-configure 900-mA input limit for CDP compliance.

Handheld Industrial Scanner

Bluetooth Headset with Fast Charge

Use Scenario: Recharging a ruggedized barcode scanner's Li-ion pack in field-deployed environments with mixed USB/AC sources.

IC Role / Device Role / Timing Role: Robust charger with VIN_DPM (programmed to 4.4 V) to sustain charging under weak USB ports; uses watchdog timer to recover from host lockup.

Use Value: Maintains >85% efficiency at 1-A load across 5–7 V input range and prevents false battery removal detection via AnyBoot algorithm.

Use Scenario: Supporting 15-minute fast charge capability in a compact Bluetooth headset with thermal constraints.

IC Role / Device Role / Timing Role: High-efficiency charger with 3-MHz switching minimizing inductor size; JEITA monitoring disables charging below 0°C or above 45°C.

Use Value: Enables 60% battery recovery in 15 minutes using 1.5-A ICHG while staying within 85°C junction limit via thermal regulation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion battery charger applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ24258RGET	Standalone-only mode (no I²C); adds EN1/EN2/EN3 pins for USB 3.0 compliance; supports LiFePO₄ chemistry (3.8 V VREG).	Targeted for cost-sensitive, non-hosted systems requiring USB 3.0 input current control; lacks I²C configurability and DBP sync.	Select BQ24258RGET when I²C interface is unnecessary and USB 3.0 adapter compatibility is required.
BQ24296RGER	Higher 3.5-A charge current; 17-V max input; integrated USB OTG boost; no D+/D− detection; uses different I²C address (0x6B).	Designed for tablets and larger portable devices needing bidirectional power and higher input voltage tolerance; lacks BC1.2 detection.	Select BQ24296RGER when OTG boost, >2-A charging, or >6.5-V input support is required.

Compared with BQ24257RGET, BQ24258RGET removes I²C but adds USB 3.0 control pins and LiFePO₄ support, while BQ24296RGER trades BC1.2 detection for OTG boost and higher current-making BQ24257RGET optimal for host-managed smartphones with strict USB compliance needs.

Availability

BQ24257RGET is available at Aetrix Electronics and suitable for smartphone power management, portable media players, handheld industrial scanners, and Bluetooth headsets requiring stable component supply and long-term lifecycle support.

Supply support for BQ24257RGET includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The bq2425x product line was designed specifically for space-constrained portable electronics requiring high-efficiency, dual-mode (I²C/standalone) single-cell Li-ion charging with integrated sensing and USB compliance.

FAQ

What are the supported input sources for the BQ24257RGET?

The BQ24257RGET accepts power from standard USB ports (SDP, CDP, DCP) and AC wall adapters via its single IN pin. BC1.2 D+/D− detection automatically identifies source type and configures appropriate input current limits (e.g., 100 mA for SDP, 900 mA for CDP). The device operates from 4.35 V to 6.5 V and tolerates up to 20 V transient input, making it compatible with both legacy and modern USB power delivery ecosystems. BQ24257RGET does not support USB PD negotiation but complies with BC1.2 and Apple/TomTom proprietary charging signatures.

How does the BQ24257RGET implement battery temperature monitoring?

The BQ24257RGET uses its TS pin to interface with a battery-pack NTC thermistor in a resistor divider between LDO (4.9 V) and GND. It monitors voltage at the TS node and compares it against four factory-trimmed thresholds-VHOT (30% VLDO), VWARM (38.3% VLDO), VCOOL (56.7% VLDO), and VCOLD (60% VLDO)-to enforce JEITA-compliant charging behavior. When temperature exceeds safe limits, BQ24257RGET suspends charging or reduces current; hysteresis (1% VLDO) prevents oscillation. This voltage-based method eliminates need for external ADC or comparator circuits.

Can the BQ24257RGET operate without I²C communication?

Yes, the BQ24257RGET supports full standalone operation using external resistors on ISET, ILIM, and VDPM pins to set charge current, input current limit, and input DPM threshold respectively. In this mode, it defaults to I²C address 0x6A but ignores I²C commands unless actively accessed by a host before watchdog timeout (50 s). Standalone mode is active when no I²C traffic occurs, and it serves as the fallback behavior for DCP adapters. BQ24257RGET retains all protection features-including thermal regulation, safety timer, and OVP-in standalone mode.

What is the function of the PMID pin on the BQ24257RGET?

The PMID pin on the BQ24257RGET is the connection point between the internal blocking FET and high-side FET, serving as the switched output of the buck converter's power path. It delivers regulated system power to downstream loads (e.g., PMIC, application processor) and must be bypassed with a 1-μF ceramic capacitor to PGND near the pin. Unlike BAT, PMID remains active during battery disconnection or deep discharge, enabling system operation even when the battery is absent or depleted-a key feature for "instant-on" user experience in smartphones and tablets.

Is the BQ24257RGET recommended for new designs?

No, Texas Instruments has designated the BQ24257RGET as "Not Recommended For New Designs" per its official datasheet (SLUSBG0C, October 2014 revision). While fully qualified and available for existing production, TI recommends migrating to newer alternatives such as BQ24296 or BQ25601 for new projects due to enhanced features including higher charge current, USB OTG boost, and extended input voltage range. BQ24257RGET remains supported for legacy design refreshes and long-term maintenance releases with documented lifecycle management through Aetrix Electronics.

BQ24257RGET Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Battery Chemistry:: Multi-Chemistry

Number of Cells:: 1

Current - Charging:: Constant - Programmable

Programmable Features:: Timer

Fault Protection:: Over Temperature, Over Voltage

Charge Current - Max:: 2A

Battery Pack Voltage:: 4.44V (Max)

Voltage - Supply (Max):: 6.5V

Interface:: I2C, USB

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-VQFN (4x4)

BQ24257RGET FAQ

1.How can I place an order for BQ24257RGET through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ24257RGET on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BQ24257RGET reliable?

The price and inventory of BQ24257RGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24257RGET is usually 5 days.

3.What payment methods are accepted for BQ24257RGET?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24257RGET transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ24257RGET?

BQ24257RGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ24257RGET order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BQ24257RGET?

For technical support, including BQ24257RGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24257RGET requirements.

6.How does Aetrix verify that BQ24257RGET is sourced from the original manufacturer or authorized distributors?

All BQ24257RGET products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ24257RGET meets industry standards.

7.What is the process for return or replacement of BQ24257RGET?

All BQ24257RGET units undergo pre-shipment inspection (PSI). If there is an issue with BQ24257RGET, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BQ24257RGET part is unused and in its original packaging.

Return procedure for BQ24257RGET:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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