LTC4162EUFD-L42 - 35V/3.2A 8-Cell Li-Ion Battery Charger | ADI
부품 번호: LTC4162EUFD-L42 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $12.55 | $12.55 |
| 10 | $11.85 | $118.50 |
| 100 | $10.65 | $1,065.00 |
| 500 | $9.45 | $4,725.00 |
| 1,000 | $8.75 | $8,750.00 |
LTC4162EUFD-L42 개요
A battery charger (also called a charge management IC or PowerPath manager) is a specialized power management IC that combines a switching converter, charge termination logic, and input-source arbitration into a single device. It sits between the external DC input source (wall adapter, USB-C, solar panel) and the rechargeable battery pack, and belongs to the broader power management hierarchy: charger IC -> battery management -> power management IC -> mixed-signal semiconductor. Modern multicell chargers like the LTC4162-L additionally provide telemetry over I2C so a host MCU can read battery voltage, charge current, input current, die temperature, and fault status in real time.
Key features of the LTC4162EUFD-L42 include 4.5V to 35V input operating range, 3.2A maximum charge current with +/-2% accuracy, integrated 40V/-40V N-channel MOSFETs, an integrated input current limit amplifier, and an I2C/SMBus-compatible interface for telemetry and configuration. The chip also provides NTC thermistor input for JEITA-style battery temperature qualification, programmable charge timer, C/10 detection for charge termination, and a dedicated thermistor-aware JEITA profile. The 28-lead QFN package offers low thermal resistance and exposed pad for high-current conduction.
The LTC4162EUFD-L42 uses a constant-current / constant-voltage (CC/CV) control loop with an average current-mode architecture, allowing clean step-down conversion at high efficiency across a wide VIN range. The synchronous rectifier eliminates the external Schottky diode, improving efficiency by 4-8% compared to asynchronous designs. The integrated PowerPath MOSFETs allow seamless switchover between input source and battery without interruption to the system load, which is critical for portable medical, industrial, and e-mobility applications.
Typical applications include portable medical devices, e-bikes and e-scooters, battery-backup systems for industrial equipment, solar-powered IoT gateways, and ruggedized tablets. The wide VIN range also makes it suitable for 24V industrial bus-powered charging stations and 12V/24V lead-acid-to-Li-Ion field-replacement modules.
When designing with the LTC4162EUFD-L42, ensure the input capacitor bank uses low-ESR ceramics rated for the full VIN range, and that the inductor is sized to handle the 3.2A RMS current plus 20% ripple. The exposed pad must be soldered to a sufficiently large copper pour (at least 1 square inch) to maintain junction temperature below 125C under worst-case VIN-VBAT and IOUT conditions.
This page synthesizes distributor pricing, drop-in alternatives from the LTC4162 family, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: LTC4162EUFD-L42 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC4162EUFD-L42 (동일 폼 팩터 및 풋프린트) — 차이점: Package, Topology, Number of Cells Supported, Operating Temperature Range, RoHS Status.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC4162EUFD-L41
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4162EUFD-L40
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4162EUFD-L42M#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4162EUFD-L42#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4162IUFD-L42#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4162EUFD-L42 사양
| 기능 | Synchronous step-down switching battery charger with PowerPath and I2C telemetry |
| Battery Chemistry | Lithium-Ion / Lithium-Polymer |
| Number of Cells Supported | 1 cell to 8 cells |
| Float Voltage (per cell) | 4.2 V (L42 suffix) |
| 입력 전압 범위 | 4.5 V to 35 V |
| Maximum Charge Current | 3.2 A |
| Charge Current Accuracy | +/-2% (per datasheet) |
| 토폴로지 | Synchronous step-down (buck) with PowerPath |
| Communication Interface | I2C / SMBus-compatible |
| Integrated MOSFETs | Yes (top and bottom N-channel synchronous FETs) |
| NTC Thermistor Input | Yes (JEITA-aware) |
| Charge Termination | C/10 detection + programmable timer |
| 동작 온도 범위 | -40C to +125C (E grade = extended) |
| 패키지 | 28-pin QFN (4 mm x 5 mm x 0.75 mm) with exposed pad |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 (per JEDEC J-STD-020) |
| RoHS 상태 | Compliant (PBF suffix) |
| Lead-Free / Halogen-Free | Yes / Yes |
LTC4162EUFD-L42 핀 구성
| 핀 1 | VIN — Input supply voltage (4.5 V to 35 V) |
| 핀 2 | VIN — Input supply voltage (second bond pad) |
| 핀 3 | EN — Enable input (active high) |
| 핀 4 | INFET — Gate drive for input ideal-diode/PowerPath MOSFET |
| 핀 5 | CLPROG — Input current limit programming |
| 핀 6 | IMON — Input current monitor output |
| 핀 7 | ILIM — Input current limit threshold |
| 핀 8 | BG — Bottom gate / synchronous rectifier driver reference |
| 핀 9 | SW — Switch node (inductor connection) |
| 핀 10 | SW — Switch node (second bond pad) |
| 핀 11 | TG — Top gate driver output |
| 핀 12 | BST — Bootstrap capacitor for top gate driver |
| 핀 13 | VOUT — System output voltage (PowerPath output) |
| 핀 14 | BAT — Battery connection sense |
| 핀 15 | SENSE — Charge current sense resistor (positive) |
| 핀 16 | SENSE- — Charge current sense resistor (negative) |
| 핀 17 | ICHGPROG — Charge current programming |
| 핀 18 | NTC — Thermistor input (JEITA-aware) |
| 핀 19 | TIMER — Charge timer capacitor |
| 핀 20 | CHRG — Charge status open-drain output |
| 핀 21 | ACPR — AC present open-drain output |
| 핀 22 | FAULT — Fault open-drain output |
| 핀 23 | SDA — I2C data |
| 핀 24 | SCL — I2C clock |
| 핀 25 | ADDR — I2C slave address select |
| 핀 26 | INT — Interrupt open-drain output |
| 핀 27 | VDD — Internal LDO output (decouple with 1 uF) |
| 핀 28 | GND — Ground (also serves as thermal pad bond) |
일반적인 애플리케이션
LTC4162EUFD-L42 적합 용도: 6 애플리케이션s: Portable Medical Devices, E-Bikes and E-Scooters, Industrial Battery-Backup Systems, Solar-Powered IoT Gateways, Ruggedized Tablets and Field Computing, 24V/36V Li-Ion Cordless Power Tools.
Portable Medical Devices
The LTC4162EUFD-L42's integrated PowerPath topology enables instant-on system startup even when the Li-Ion battery is deeply discharged, which is critical for medical devices such as infusion pumps and patient monitors that must boot reliably in an emergency. Its 3.2 A charge current supports fast turnaround between patient shifts, and the JEITA-aware NTC input allows safe charging at the body-temperature extremes encountered in clinical environments. Placed between a 12-19 V medical-grade adapter and a 2S-4S battery pack, the regulator provides 4.17 uV-equivalent clean rail telemetry via I2C to the host MCU. Designers should pair it with low-ESR ceramic input capacitors and validate EMI/EMC per IEC 60601-1.
추천
E-Bikes and E-Scooters
The LTC4162EUFD-L42 supports up to 8-series Li-Ion cell stacks (28.8 V nominal at full charge), making it well suited for e-bike and e-scooter battery packs where high pack voltage reduces cable losses. Its 3.2 A continuous charge current extends battery life by enabling moderate C-rate charging (typically 0.3C to 0.5C for Li-Ion), and the I2C telemetry lets the vehicle's display report real-time state-of-charge and pack health. The 35 V abs-max input tolerates regenerative-braking voltage spikes when paired with a TVS clamp. Mount the exposed pad over a 1 sq inch copper pour to dissipate peak 12 W charge power without thermal shutdown.
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Industrial Battery-Backup Systems
For industrial 24 V bus-powered battery-backup modules, the LTC4162EUFD-L42's 35 V input rating accepts the full industrial DC-bus range including transients, while its PowerPath output isolates the load from the battery so the system runs continuously during AC mains failure. The 8-cell support covers 24 V Li-Ion packs directly without stacking boost converters, reducing BOM cost. Integrated C/10 termination and programmable timer prevent float-charge overstress during long backup-hold events. The exposed-pad QFN simplifies thermal design in sealed IP65 enclosures.
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Solar-Powered IoT Gateways
The LTC4162EUFD-L42's wide 4.5 V to 35 V input range and integrated input current-limit amplifier allow direct connection to 18 V or 36 V solar panels without pre-regulation. The PowerPath topology seamlessly switches between solar source, battery, and load, enabling 24/7 operation of remote IoT gateways in off-grid installations. The I2C telemetry stream provides panel voltage, battery voltage, and charge current to the gateway's MCU for adaptive MPPT algorithms. Pair with a 4S or 6S Li-Ion pack for multi-day autonomy.
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Ruggedized Tablets and Field Computing
Ruggedized tablets for construction, military, and field-service use require wide-input chargers that tolerate 12 V vehicle adapters, 19 V laptop bricks, and unpredictable generator outputs. The LTC4162EUFD-L42's 4.5-35 V VIN absorbs all of these without modification, while its 3.2 A charge current refills a 4S Li-Ion pack (~50 Wh) in under 90 minutes. The PowerPath instant-on ensures the tablet boots immediately on adapter plug-in even with a depleted battery, which field technicians depend on. The exposed-pad QFN survives -40C to +85C ambient operation.
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24V/36V Li-Ion Cordless Power Tools
The 8-cell support and 35 V input of the LTC4162EUFD-L42 make it well-suited for 36 V-class cordless power tool battery packs, where 10S Li-Ion would require an additional buck stage. The 3.2 A charge current supports 1C fast-charge for 3 Ah packs in roughly 60 minutes. I2C telemetry lets the tool display report remaining runtime, while the integrated JEITA thermistor interface prevents charging below 0C which would otherwise plate metallic lithium. The exposed-pad QFN handles peak 15 W dissipation in the tool's sealed handle.
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추천 제품 요약
엔지니어링 참조 데이터: LTC4162EUFD-L42 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC4162EUFD-L41 | LTC4162EUFD-L40 | LTC4162EUFD-L42M#PBF | LTC4162EUFD-L42#TRPBF | LTC4162IUFD-L42#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-QFN (4x5) | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same |
| Float Voltage (per cell) | 4.2 V | 4.1 V | 4.0 V | 4.2 V | 4.2 V | 4.2 V |
| Maximum Charge Current | 3.2 A | 3.2 A | 3.2 A | 3.2 A | 3.2 A | 3.2 A |
| Input Voltage Range | 4.5 V to 35 V | 4.5 V to 35 V | 4.5 V to 35 V | 4.5 V to 35 V | 4.5 V to 35 V | 4.5 V to 35 V |
| Operating Temperature | -40C to +125C (E grade) | -40C to +125C (E grade) | -40C to +125C (E grade) | -55C to +125C (M grade) | -40C to +125C (E grade) | -40C to +125C (I grade) |
| I2C Telemetry | Yes | Yes | Yes | Yes | Yes | Yes |
| Packaging Code | #PBF (tray) | #PBF | #PBF | #PBF | #TRPBF (2,500 reel) | #PBF |
주요 차별점
- 8-cell Li-Ion support in 28-QFN (4x5) (vs TI BQ25703)
- 35 V abs-max input voltage (vs TI BQ25703 (24 V max))
- Integrated PowerPath instant-on (vs MCP73123 (standalone charger only))
설계 노트
At VIN = 19 V, VBAT = 14.4 V (4S Li-Ion), and ICHARGE = 3.2 A, the LTC4162EUFD-L42 dissipates approximately 14.7 W. With a 28-QFN (4x5) thermal pad of approximately 38 C/W theta_JA on a 4-layer 1 oz PCB, the junction temperature rises about 105 C above the 25 C ambient, approaching the 125 C limit. Estimated: design for VIN-VBAT <= 5 V at full charge current, or add an external heatsink/thermal via array to keep junction below 110 C. Always refer to the LTC4162-L datasheet thermal derating curves for production designs.
Place input capacitors (>= 4.7 uF X7R 50 V rated) within 5 mm of the VIN pins, and use a low-ESR ceramic bank (>= 22 uF total) at VOUT to handle the synchronous-rectifier commutation. The SW node trace must be short and wide (>= 0.5 mm) to minimize ringing; route it on the top layer only and keep the bottom-layer ground plane unbroken beneath the SW loop. The exposed pad (pin 29 thermal pad) must be soldered to a contiguous ground pour with at least 9 thermal vias for 1 oz copper to meet the 38 C/W theta_JA.
Do not exceed 35 V on VIN; load-dump transients on 24 V industrial buses can reach 60 V and require an external TVS clamp (e.g. SMAJ33CA). The NTC pin must see a 10 kohm B = 3950 thermistor; using the wrong B-constant will mis-trigger JEITA hot/cold thresholds and abort charging prematurely. The SDA/SCL lines require 4.7 kohm pull-ups to VDD (not VOUT); using external pull-ups to 5 V will exceed the I2C abs-max on the LTC4162EUFD-L42 pins.
The SW node edge rates exceed 1 V/ns on the LTC4162EUFD-L42; keep sensitive analog traces (NTC, IMON, SENSE) at least 5 mm away and route them on an inner layer with a continuous ground stitch. If the design includes a fuel-gauge ADC reading across SENSE+, place 100 ohm isolation resistors at the ADC input to dampen charge-current transients. The I2C traces should be kept below 50 mm or use a buffer if the host MCU is on a separate board.
규정 준수 정보
RoHS compliant per the #PBF suffix. Halogen-free per Analog Devices product page. AEC-Q100 not applicable (this is a power management IC, not an automotive-grade qualified part). For automotive applications, use the LTC4162EUFD-L42 in industrial designs only or pair with external ASIL-rated supervision.
