ISL9205AIRZ - 900mA Li-Ion/Li-Polymer Charger IC | Renesas
부품 번호: ISL9205AIRZ ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.89 | $18.90 |
| 100 | $1.65 | $165.00 |
| 500 | $1.42 | $710.00 |
| 1,000 | $1.18 | $1,180.00 |
ISL9205AIRZ 개요
A linear Li-ion charger IC is a power management device that regulates current and voltage from a DC source (typically USB or AC adapter) into a rechargeable lithium-ion or lithium-polymer cell. Unlike switching chargers, linear chargers dissipate the excess input-to-battery voltage as heat, trading efficiency for smaller BOM size, lower EMI, and simpler PCB layout. Within the broader power management hierarchy, the ISL9205AIRZ sits at: battery management IC -> charger IC -> linear charger -> power management IC.
Key features of the ISL9205AIRZ include 1% charge voltage accuracy over the full operating range, integrated MOSFET pass element, automatic recharge of a depleted battery, built-in thermal regulation that folds back charge current at high die temperatures, and a CHRG output pin for LED status indication. The -A suffix indicates the variant with no internal safety timer, allowing the system controller to handle termination externally.
The ISL9205 uses an external low-side current-sense resistor between VBAT and the battery to set the charging current via the ISET pin. Its 2.5V minimum input voltage enables charging from low-voltage sources including solar panels or weak USB ports. The exposed thermal pad on the DFN-10 package provides a low thermal resistance path critical for dissipating the linear charger losses at high charge currents.
Typical applications include wearable health devices, Bluetooth headsets, portable medical sensors, single-cell power banks, IoT sensor nodes, and backup battery charging for industrial data loggers. The device's tiny 3x3 mm footprint and minimal external component count (typically 5-7 parts) make it especially attractive in designs where PCB area is at a premium.
When designing with this part, calculate the worst-case power dissipation as (VIN_max - 4.2V) x Icharge. At 5V input and 900 mA charge current, this is 0.72 W, requiring attention to the copper area beneath the exposed pad to keep junction temperature within safe limits.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
드롭인 대체품: ISL9205AIRZ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ISL9205CIRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL9205DIRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL9205BIRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL9205AIRZ-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL9205IRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL9205AIRZ 사양
| 기능 | Linear Li-Ion/Li-Polymer battery charger |
| Number of Cells Supported | 1 (single cell) |
| Battery Chemistry | Lithium-Ion / Lithium-Polymer |
| 입력 전압 범위 | 2.5 V to 6.5 V |
| Charge Current Range | 50 mA to 900 mA (programmable) |
| Charge Voltage Accuracy | 1 % |
| Charge Termination Voltage | 4.2 V |
| Current Sensing Method | External low-side sense resistor (ISET) |
| 패키지 | 10-pin DFN (3x3 mm) with exposed thermal pad |
| 실장 유형 | Surface Mount |
| 동작 온도 범위 | -40 C to +85 C (industrial grade) |
| Safety Timer | None (variant -A, external termination) |
| Thermal Regulation | Yes (automatic charge current foldback) |
| Status Output | CHRG open-drain output |
| RoHS 상태 | Compliant |
| JEDEC Package Code | S-PDSO-N16 (per datasheet) |
ISL9205AIRZ 핀 구성
| 핀 1 | VIN — Input supply voltage (2.5V to 6.5V) |
| 핀 2 | GND — Ground |
| 핀 3 | EN — Charger enable input |
| 핀 4 | ISET — Charge current programming via external resistor |
| 핀 5 | VSENSE — External current-sense resistor input |
| 핀 6 | VBAT — Battery connection / charge output |
| 핀 7 | CHRG — Open-drain charge status output |
| 핀 8 | NC — Not connected (per datasheet) |
| 핀 9 | NC — Not connected (per datasheet) |
| 핀 10 | EP — Exposed thermal pad (connect to GND) |
일반적인 애플리케이션
ISL9205AIRZ 적합 용도: 6 애플리케이션s: Wearable Fitness Tracker Charging, Bluetooth Headset Battery Charging, Portable Medical Sensor Charging, Single-Cell Power Bank Charging, IoT Sensor Node Solar Charging, Industrial Data Logger Backup Battery Charging.
Wearable Fitness Tracker Charging
The ISL9205AIRZ's 3x3 mm DFN-10 footprint and minimal external BOM make it ideal for space-constrained wearable designs such as fitness bands and smartwatches. Its 900 mA maximum charge current supports fast-charging of small single-cell Li-poly batteries typical in wearables (typically 100-300 mAh), reducing charge time from empty to full to under 60 minutes. The exposed thermal pad helps dissipate the linear charger's heat in the small enclosures common to wrist-worn devices, where PCB copper area is the only heatsink available.
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Bluetooth Headset Battery Charging
Bluetooth headsets require single-cell Li-poly charging from a 5V USB rail in a highly compact PCB layout. The ISL9205AIRZ accepts the 5V USB input directly without any front-end regulation, simplifying the design. According to the Renesas datasheet, its 2.5V minimum input allows operation even when the USB source is weak or voltage-dropped through a long cable. The CHRG pin drives an LED indicator directly, eliminating the need for additional GPIO on the host MCU.
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Portable Medical Sensor Charging
Single-use and rechargeable medical sensors such as glucose monitors, pulse oximeters, and continuous thermometer patches rely on the ISL9205AIRZ for safe, accurate battery charging. The device's 1% charge voltage accuracy preserves battery cycle life and ensures consistent capacity readings across units - critical for regulated medical applications. Its industrial-grade -40 C to +85 C operating range supports clinical and home-care environments. The external V-sense resistor gives designers precise control over charge current for medical-specific battery profiles.
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Single-Cell Power Bank Charging
Compact power banks for emergency phone charging use single 18650 or Li-poly cells with built-in charging ICs. The ISL9205AIRZ's 900 mA charge current supports 1C charging of cells up to 900 mAh, balancing charge speed with thermal safety. According to the Renesas datasheet, its automatic recharge feature automatically tops up the power bank's cell when the user leaves a device connected for extended periods, ensuring readiness for emergency use.
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IoT Sensor Node Solar Charging
Wireless sensor nodes deployed in remote locations often harvest energy from small solar panels, requiring chargers that work with weak or variable input sources. The ISL9205AIRZ's 2.5V minimum input voltage allows operation directly from low-output solar panels that would not work with chargers requiring 4.5V+ minimum. According to the Renesas datasheet, its low quiescent current preserves harvested energy during nighttime, and its small DFN-10 package fits the constrained PCB area typical of sensor nodes.
추천
Industrial Data Logger Backup Battery Charging
Industrial data loggers and remote telemetry units often include a small backup Li-ion cell to ride out brief power interruptions. The ISL9205AIRZ charges this backup cell from the main 5V or 3.3V supply without disrupting system operation. Its industrial temperature range (-40 C to +85 C) is suitable for factory floor and outdoor cabinet installations. The exposed thermal pad and high charge current capability ensure the backup cell stays topped up even in elevated ambient temperatures.
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추천 제품 요약
엔지니어링 참조 데이터: ISL9205AIRZ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ISL9205CIRZ | ISL9205DIRZ | ISL9205BIRZ | ISL9205AIRZ-T | ISL9205IRZ |
|---|---|---|---|---|---|---|
| Package | DFN-10 (3x3 mm) | DFN-10 (3x3 mm) - same | DFN-10 (3x3 mm) - same | DFN-10 (3x3 mm) - same | DFN-10 (3x3 mm) - same | DFN-10 (3x3 mm) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Charge Current Range | 50 mA to 900 mA | 50 mA to 900 mA | 50 mA to 900 mA | 50 mA to 900 mA | 50 mA to 900 mA | 50 mA to 900 mA |
| Input Voltage Range | 2.5 V to 6.5 V | 2.5 V to 6.5 V | 2.5 V to 6.5 V | 2.5 V to 6.5 V | 2.5 V to 6.5 V | 2.5 V to 6.5 V |
| Charge Voltage | 4.2 V +/-1% | 4.2 V +/-1% | 4.2 V +/-1% | 4.2 V +/-1% | 4.2 V +/-1% | 4.2 V +/-1% |
| Safety Timer | None (external MCU termination) | Yes (programmable) | Yes (with thermistor input) | Yes (programmable) | None (external MCU termination) | Yes (programmable) |
| Thermal Regulation | Yes | Yes | Yes | Yes | Yes | Yes |
| Battery Thermistor Input | No | No | Yes | No | No | No |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
주요 차별점
- Programmable charge current up to 900 mA via external sense resistor (vs MCP73831)
- Low 2.5V minimum input voltage (vs ISL6294)
- Small 3x3 mm DFN-10 footprint with exposed thermal pad (vs MCP73831 (MSOP-8))
설계 노트
Estimated: at VIN=5V, VOUT=4.2V (CV phase) and 900 mA charge current, the linear charger dissipates approximately 0.72 W (assuming worst-case dropout condition). The DFN-10 package thermal resistance is approximately 50 C/W on a standard 1 oz copper 1-square-inch pad, resulting in a 36 C junction temperature rise above ambient. For continuous 900 mA charging at high ambient temperatures, increase the exposed-pad copper area to 2 square inches to maintain junction temperature below 125 C.
The ISL9205AIRZ (variant -A) does not include a safety timer, meaning that if the CHRG pin is not monitored by an external MCU, a faulty battery can remain on charge indefinitely. This is by design - the host system is expected to handle termination. If your design cannot guarantee MCU supervision, choose the ISL9205CIRZ or ISL9205DIRZ variant which includes a programmable internal safety timer. Also, ensure the external V-sense resistor is rated for the expected charge current - typical 1% tolerance resistors in 0805 or larger packages are recommended.
Route the VBAT trace directly to the battery terminal, bypassing any significant parasitic resistance. Place input and output ceramic capacitors (1 uF to 10 uF X5R or better) as close as possible to the VIN and VBAT pins. The exposed thermal pad must be soldered to a copper pour connected to GND with multiple thermal vias for heat dissipation. Avoid routing high-current charge traces through thin necked sections that add resistance and cause voltage sensing errors at the V-sense resistor.
규정 준수 정보
RoHS and REACH compliant per Renesas product page. Not AEC-Q100 qualified - industrial grade only. For automotive applications, consult Renesas for Q1-graded variants.
