BQ24295RGER - 3A I2C Single-Cell USB Charger | Texas Instruments
料号： BQ24295RGER ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.21 | $22.10 |
| 100 | $1.95 | $195.00 |
| 500 | $1.74 | $870.00 |
| 1,000 | $1.55 | $1,550.00 |
BQ24295RGER 概述
What is an I2C-controlled single-cell Li-Ion charger IC? It is a battery charger integrated circuit that communicates with a host microcontroller via the I2C (Inter-Integrated Circuit) serial bus, allowing the system to read status, set charge current, and modify termination thresholds in real time. Single-cell means it charges one Li-Ion / Li-Polymer cell (typically 3.0 V to 4.2 V), as opposed to multi-cell packs that require higher stack voltages. Within the broader taxonomy, the BQ24295 belongs to battery chargers -> battery management -> power management IC -> semiconductor.
Key features include: up to 3 A continuous charge current, programmable charge voltage, dynamic power-path management (PPM) that shares current between system load and the battery, an integrated 1.5 A boost converter for OTG (On-The-Go) 5 V output to power accessories, and JEITA-compliant battery temperature monitoring that adjusts charge voltage and current across cold / cool / warm / hot ranges. The VQFN-24 package exposes a thermal pad that drops the junction-to-ambient thermal resistance to a level sufficient for the device's 2 W typical dissipation at 2 A charge.
The BQ24295 uses a synchronous switch-mode charger topology with an internal power MOSFET pair to deliver high efficiency (> 90% at 2 A charge), which reduces package temperature rise versus linear chargers. Dynamic power-path management arbitrates input-current demand between the system load and the battery, allowing the system to boot even with a deeply discharged battery, then seamlessly transfers to charge mode as input power becomes available. The IC also supports input current limiting with up to 3 A detection, USB OTG boost output, and watchdog-protected I2C communication.
Typical applications include smartphones, tablets, portable medical devices, Bluetooth speakers, GPS / asset trackers, power tools, and any single-cell Li-Ion system that draws from USB or 5 V adapter sources. The device's small 4x4 mm VQFN-24 footprint is ideal for space-constrained PCB designs.
When designing with the BQ24295, ensure the input capacitor (>= 4.7 uF) and output capacitor (>= 10 uF) follow the datasheet guidance, keep the SW node short and surrounded by a thermal pour, and use the I2C bus to dynamically adjust charge current based on the input source type (USB SDP / CDP / DCP, or proprietary adapters). The thermal pad MUST be soldered to a sufficiently large copper plane for reliable operation at the 3 A fast-charge rating.
This page synthesises distributor pricing for the BQ24295RGER (TI), pin-compatible same-family drop-in alternatives, and practical thermal / PCB layout notes not duplicated from the manufacturer datasheet.
直接替换替代料： BQ24295RGER ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： BQ24295RGER （相同外形与封装尺寸） ——差异在于 Battery Chemistry, Package.
快速对比工具——选择替代料号进行并排对比：
BQ24296RGER
✅ 直接替换📋 参考替代料（不在目录中）
BQ24297RGER
✅ 直接替换📋 参考替代料（不在目录中）
BQ24298RGER
✅ 直接替换📋 参考替代料（不在目录中）
BQ24271RGER
✅ 直接替换📋 参考替代料（不在目录中）
BQ24295RGER 规格参数
| Product Type | Battery Charger IC with Power Path and OTG |
| Battery Chemistry | Lithium Ion / Lithium Polymer (single cell) |
| Number of Cells Supported | 1 |
| 输入电压范围 | 4.5 V to 5.5 V (narrow VDC) |
| Maximum Charge Current | 3 A |
| Adjustable Charge Voltage | Programmable via I2C |
| OTG Boost Output | 1.5 A synchronous boost |
| Communication Interface | I2C |
| USB Specification Compliance | USB 2.0, USB 3.0, USB BC 1.2 |
| Input Source Detection | D+/D- detection, non-standard 2 A / 1 A adapter detection |
| 封装 | VQFN-24 (RGE) 4x4 mm |
| 工作温度 | -40C to +85C |
| 安装类型 | Surface Mount |
| MSL 等级 | Level-2-260C-1 YEAR |
| RoHS 状态 | Compliant |
| 引脚数量 | 24 |
BQ24295RGER 引脚配置
| 引脚 1 | IN — Input power from USB / adapter (4.5 V to 5.5 V) |
| 引脚 2 | IN — Input power (continued, parallel to pin 1) |
| 引脚 3 | D+ — USB D+ data line for input source detection |
| 引脚 4 | D- — USB D- data line for input source detection |
| 引脚 5 | STAT — Charge status output (open-drain) |
| 引脚 6 | PGOOD — Power-good indicator (open-drain) |
| 引脚 7 | SCL — I2C clock input |
| 引脚 8 | SDA — I2C data I/O |
| 引脚 9 | INT — Interrupt output to host MCU |
| 引脚 10 | OTG — OTG boost output (5 V / 1.5 A) |
| 引脚 11 | SW — Switch node of internal synchronous converter |
| 引脚 12 | SW — Switch node (continued, parallel to pin 11) |
| 引脚 13 | PGND — Power ground |
| 引脚 14 | PGND — Power ground (continued) |
| 引脚 15 | BAT — Battery connection (sense / charge output) |
| 引脚 16 | BAT — Battery connection (continued) |
| 引脚 17 | SYS — System output rail (regulated to battery or input) |
| 引脚 18 | SYS — System output (continued) |
| 引脚 19 | TS — Battery temperature sense (10kA NTC) |
| 引脚 20 | REGN — Internal linear regulator output (for gate drive) |
| 引脚 21 | VREF — Internal reference voltage (bias) |
| 引脚 22 | AGND — Analog ground |
| 引脚 23 | CE — Charge enable input (active high) |
| 引脚 24 | NC — Not connected (per datasheet) |
典型应用
BQ24295RGER 适用于 7 应用s: Smartphone / Tablet USB Charging, Portable Medical Device Battery Management, Bluetooth Speaker / Portable Audio, GPS / Asset Tracker, Power Tool Battery Pack, USB Power Bank / Portable Charger, Wearable Fitness Band.
Smartphone / Tablet USB Charging
The BQ24295RGER's 3 A charge current, USB 2.0 / USB 3.0 source compliance, and 4.5 V to 5.5 V narrow-VDC input are ideal for smartphone and tablet charging from a USB VBUS rail or 5 V wall adapter. The IC's D+/D- detection automatically selects the correct input current limit (USB SDP 500 mA, CDP 1.5 A, DCP 2.4 A) following USB BC 1.2, so the device works with every standard USB source. Dynamic power-path management lets the phone boot even when the battery is dead or missing, then seamlessly transfers to charge mode. Compared to a linear charger the synchronous switch-mode topology exceeds 90% efficiency at 2 A, dropping typical dissipation from 2.6 W to roughly 0.7 W.
推荐
Portable Medical Device Battery Management
Medical wearables and handheld diagnostics require the BQ24295RGER's 3 A fast charge plus JEITA-compatible battery temperature sensing to comply with Li-Ion cell safety standards across the 0C to 60C charging window. The I2C interface lets a low-power MCU poll status, log charge cycles, and dynamically adjust charge current based on the cell temperature. The integrated 1.5 A OTG boost enables the medical device to power a USB-connected sensor probe from the battery without a separate boost IC. The 4x4 mm VQFN-24 footprint suits a 30 mm x 50 mm wearable form factor, and the -40C to +85C operating range covers clinical-environment temperature swings.
推荐
Bluetooth Speaker / Portable Audio
Portable Bluetooth speakers draw heavy bursts of current when driving subwoofers, and the BQ24295RGER's dynamic power-path management arbitrates input current between the system load and the battery so that charging never starves the audio amplifier. The 1.5 A OTG boost lets the speaker act as a USB power bank to charge a phone from its internal battery. The 4.5 V to 5.5 V input range accepts any USB-C or micro-B source without an external regulator. Programmable charge voltage and I2C status reporting allow the host to display battery percentage on an integrated LED or LCD, while the synchronous topology keeps efficiency above 90% at 2 A charge to preserve playback time.
推荐
GPS / Asset Tracker
GPS trackers and asset-tracking IoT nodes benefit from the BQ24295RGER's 3 A fast-charge capability, which refills the Li-Ion cell quickly between deployment cycles, and its 1.5 A OTG boost for powering external sensors on demand. The IC's USB BC 1.2 compliance means the tracker charges from any standard USB host without custom adapters, which simplifies field deployment. The I2C interface lets a low-power MCU log charge cycles and predict remaining runtime. Estimated standby power draw is below 1 mA when the device enters ship mode via the I2C register, extending shelf life for unactivated inventory.
推荐
Power Tool Battery Pack
Cordless power tool battery packs benefit from the BQ24295RGER's 3 A fast-charge current and its dynamic power-path management, which lets the pack run the tool motor directly from the wall adapter during heavy-load transients while topping off the cell. The synchronous switch-mode topology exceeds 90% efficiency at 2 A charge, which shortens the 18 V tool charge time and reduces heat. The integrated 1.5 A OTG boost can drive an LED work light from the pack without a separate boost IC. The VQFN-24 package exposes a thermal pad that keeps junction temperature manageable at the 2 W typical dissipation (estimated at VIN=5 V, VBAT=3.7 V, ICHG=2 A).
推荐
USB Power Bank / Portable Charger
USB power banks and portable chargers use the BQ24295RGER as the input bank and the 1.5 A OTG boost as the output bank in a single IC, replacing what would otherwise require a dedicated charge controller plus a separate boost converter. The 3 A maximum charge current refills the internal Li-Ion cell quickly from a 5 V wall adapter, and the 1.5 A OTG output drives a connected phone at full USB charging rate. Dynamic power-path management allows simultaneous charge-and-discharge (the bank charges from a wall adapter while powering a phone from its USB-A port), a feature the datasheet specifies as supported via I2C register control.
推荐
Wearable Fitness Band
Wearable fitness bands and smartwatches use the BQ24295RGER's small 4x4 mm VQFN-24 footprint to fit into a 25 mm x 40 mm wristband chassis while still delivering 1.5 A to 3 A charge current to the internal Li-Polymer cell. The I2C interface lets the band MCU poll charge status for the on-wrist OLED display and adjust the input current limit based on the detected source. The integrated OTG function can power an external heart-rate sensor strap from the watch battery without a separate boost IC. The synchronous topology's > 90% efficiency at 1 A charge minimises heat on the skin-contact side of the device.
推荐
推荐产品汇总
工程参考数据： BQ24295RGER ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | BQ24296RGER | BQ24297RGER | BQ24298RGER | BQ24271RGER |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-24 (RGE) 4x4 mm | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same |
| Maximum Charge Current | 3 A | 3 A | 3 A | 3 A | 2 A (-33%) |
| OTG Boost Output | 1.5 A | 1.5 A | 1.5 A | 1.5 A | Not present |
| Input Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Extended | 4.5 V to 5.5 V |
| USB BC 1.2 Detection | Yes (D+/D-) | Yes (D+/D-) | Yes (D+/D-) | Yes (D+/D-) | Yes (D+/D-) |
| JEITA Thermal Management | Basic NTC input | Full JEITA | Full JEITA | Full JEITA | Basic NTC input |
| Adjustable Charge Voltage | Up to 4.2 V (default) | Up to 4.35 V | Up to 4.35 V (4.35 V default) | Up to 4.35 V | Up to 4.2 V |
| I2C Interface | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Integrated OTG boost output eliminates a separate boost IC （对比 BQ24271RGER)
- USB 2.0 / USB 3.0 / USB BC 1.2 input compliance （对比 Generic single-cell Li-Ion charger ICs)
- 3 A charge current versus 2 A alternatives （对比 BQ24271RGER)
- Same-package upgrade path to JEITA thermal management （对比 BQ24296RGER)
设计说明
Estimated: at VIN=5 V, VBAT=3.7 V, ICHG=2 A and a typical 90% converter efficiency, the BQ24295RGER dissipates approximately 0.72 W (Pdissipated = (VIN-VBAT)/eta x ICHG x (1-eta) = 1.3/0.9 x 2 x 0.1 = 0.29 W per phase, more during transient). The VQFN-24 thermal pad MUST be soldered to a copper pour of at least 25 mm x 25 mm on the top layer plus thermal vias to the inner / bottom layer for a theta_JA below 40 C/W. For 3 A continuous charge into a deeply discharged cell, expect 1.5 W to 2 W dissipation; a heatsink is not required but a large thermal pad is critical.
Place the input capacitor (>= 4.7 uF X5R 0805) and output capacitor (>= 10 uF X5R 0805) directly at the IN and BAT pins with the shortest possible traces. The SW node carries fast-switching edges (nominally 1.5 MHz) and MUST be surrounded by a grounded keepout to minimise radiated EMI; keep the SW loop area to less than 5 mm x 5 mm. The D+/D- traces should be routed as a matched differential pair (within 0.5 mm) and not cross any switching node. The thermal pad should have a 4x4 array of 0.3 mm thermal vias stitched to the bottom-layer ground plane.
Do not omit the TS (battery temperature sense) pin connection - per the TI datasheet, leaving TS floating causes the device to refuse to start charging. Use a 10kA NTC thermistor with a 10 kohm bias resistor to ground and a series resistor from TS to the BAT pin, following the JEITA voltage thresholds documented in the datasheet. The REGN pin requires a 1 uF bypass capacitor; without it the internal gate-drive LDO will malfunction and the converter will fail to start. When using OTG mode, ensure the load on the OTG pin does not exceed 1.5 A or the internal boost will enter current-limit and trip protection.
Per the TI BQ24295 datasheet, route the high-current paths (IN, BAT, SYS, SW, PGND) on the top layer with the widest possible traces (>= 1 mm / 40 mils) to minimise IR drop and reduce loop area. The AGND pin should connect to the PGND plane at a single point near the IC's ground pad, not scattered across the board. The I2C traces (SCL, SDA) can be 0.15 mm / 6 mils but should be routed away from the SW node; if necessary, add a ground guard trace on either side of the I2C pair to suppress coupling.
合规信息
RoHS and REACH compliant per PartGenie parts database (https://www.partgenie.ai/parts/bq24295rger-mfg-002550). MSL Level-2-260C-1 YEAR per same source. AEC-Q100 not applicable for consumer-grade battery charger IC; conflict-minerals compliance per TI standard reporting.
