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Analog Devices Inc. LTC4124EV#TRPBF
- Part No.:
- LTC4124EV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC4124EV#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,401
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Product details
Overview
LTC4124EV#TRPBF from Analog Devices is a pin-configurable wireless Li-ion battery charger IC supporting up to 100mA charge current and 4.35V charge voltage, with integrated low-battery disconnect (2.7V/3.2V), NTC-based temperature qualified charging, and PowerPath™ ideal diode control - designed for sealed, space-constrained portable devices such as medical sensors and VR headsets.
For engineers reviewing the LTC4124EV#TRPBF datasheet, LTC4124EV#TRPBF pinout, LTC4124EV#TRPBF application, or LTC4124EV#TRPBF equivalent, this page delivers verified technical context on wireless power management, CC/CV charge control, thermal safety thresholds, and ship-mode operation - all critical for embedded battery-powered system design.
Technical Context
The LTC4124EV#TRPBF integrates three functional blocks: a wireless power manager that rectifies and regulates ACIN-derived energy (DCIN optional), a full-featured linear CC/CV charger with programmable voltage (4.0–4.35V) and current (10–100mA), and an ideal diode PowerPath™ controller enabling seamless transition between charging and battery-to-VCC discharge modes.
It implements undervoltage current limiting (UVCL) with 3.45V fault threshold, a 3-hour safety timer, automatic recharge at 97.6% of VBAT_REG, and NTC monitoring with cold/hot thresholds at 75%/35% of VCC. The CHRG pin provides four-state status indication (high-Z, slow blink, fast blink, pull-down) tied directly to charge state and faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Pin-selectable: 10mA / 25mA / 50mA / 100mA - enables precise matching to battery capacity and thermal budget. |
| Charge Voltage | Pin-selectable: 4.0V / 4.1V / 4.2V / 4.35V - supports multiple Li-ion chemistries including high-voltage variants. |
| Low Battery Disconnect | 2.7V or 3.2V threshold - prevents deep discharge damage while allowing flexible battery cutoff selection. |
| NTC Input | 100kΩ thermistor interface with 75% VCC cold / 35% VCC hot thresholds - enables safe charging across –20°C to +85°C ambient. |
| Quiescent Current | 3.5µA in done-charging mode; 50nA in disconnect/ship mode - extends shelf life and runtime in always-on IoT devices. |
| Package | 12-lead 2mm × 2mm × 0.74mm LQFN with exposed GND pad - optimized for thermal performance and ultra-compact PCB layout. |
| Operating Temp | –20°C to +85°C junction temperature - validated for wearable and medical-grade environmental requirements. |
Pinout & Package
12-lead LQFN (2mm × 2mm × 0.74mm) with exposed GND pad (Pin 13), RoHS-compliant e4 Au finish, MSL Level 3. Thermal resistance θJA = 92°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | System supply rail | Regulated output from ACIN/DCIN diodes; powers internal circuitry and external loads; range 2.7–5.5V. |
| CHRG (Pin 2) | Open-drain status indicator | Four-state signaling: high-Z (no input), slow blink (charging), fast blink (temp/bad battery/UVCL), pull-down (C/10 termination). |
| PRECHG (Pin 3) | Precharge enable control | Tie to VCC to activate 10% ICHG trickle charge below 68% VBAT_REG; tie to GND to disable. |
| VSEL1/VSEL2 (Pins 4,5) | Charge voltage programming bits | Binary selection of 4.0V/4.1V/4.2V/4.35V - sets final CV regulation point per Li-ion chemistry. |
| ISEL1/ISEL2 (Pins 6,7) | Charge current programming bits | Binary selection of 10mA/25mA/50mA/100mA - defines CC stage current and thermal dissipation profile. |
| LBSEL (Pin 8) | Low-battery disconnect threshold select | High = 3.2V, Low = 2.7V - determines minimum safe operating voltage before battery isolation. |
| NTC (Pin 9) | Thermistor input | Connects to 100kΩ NTC; monitors battery temperature via voltage divider; disables charging outside 0°C–45°C safe zone. |
| BAT (Pin 10) | Battery connection | Direct interface to single-cell Li-ion anode; supports recharge, discharge, and voltage sensing. |
| ACIN (Pin 11) | Wireless AC input | Accepts rectified RF energy from LC tank; internal diode feeds VCC; short to GND if unused. |
| DCIN (Pin 12) | Optional DC input | Backup wired supply (3.3–5.5V); diode-ORed with ACIN; short to GND if unused. |
| GND (Pin 13) | Ground reference & thermal pad | Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal conduction (θJA = 92°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable charge parameters | Four discrete voltage and current combinations eliminate external resistors and simplify BOM management. |
| Zero-drain ship mode | 50nA max battery leakage ensures >10-year shelf life for factory-shipped devices with charged batteries. |
| Integrated PowerPath™ ideal diode | 50mV forward drop from BAT to VCC enables efficient battery backup without external MOSFETs or controllers. |
| Safety timers and fault detection | 3-hour charge termination, 45-minute bad battery detection, and UVCL prevent overcharge, thermal runaway, and input starvation. |
| Thermally enhanced LQFN package | 2mm × 2mm footprint with exposed GND pad supports >1W dissipation in compact wearables and headsets. |
Applications
| Medical Wireless Sensors | Military Wearables |
|---|---|
Use Scenario: Implantable or skin-mounted biosensors requiring hermetic sealing and zero exposed connectors. IC Role / Device Role / Timing Role: Wireless power receiver, Li-ion charger, and PowerPath™ controller managing energy flow between coil, battery, and sensor subsystem. Use Value: Enables IP68-rated enclosures by eliminating physical charging ports while maintaining safe, temperature-qualified charging. |
Use Scenario: Ruggedized tactical headsets used in field operations where connector reliability and battery longevity are mission-critical. IC Role / Device Role / Timing Role: Dual-input (wireless + DC) power manager with low-battery disconnect and ship-mode preservation. Use Value: Prevents battery degradation during long-term storage and ensures immediate readiness after deployment via zero-leakage ship mode. |
| Virtual Reality Headsets | IoT Edge Devices |
Use Scenario: High-end VR headsets needing continuous wireless charging during use without interrupting user immersion. IC Role / Device Role / Timing Role: Wireless Li-ion charger with automatic recharge, UVCL, and seamless PowerPath™ transition between charging and playback modes. Use Value: Eliminates manual charging cycles and maintains >95% battery SOC during multi-hour sessions using adaptive input power management. |
Use Scenario: Battery-powered environmental monitors deployed in remote locations with infrequent maintenance windows. IC Role / Device Role / Timing Role: Ultra-low-quiescent wireless charger with NTC thermal qualification and 2.7V low-battery disconnect. Use Value: Extends operational lifetime beyond 5 years by preventing over-discharge and enabling safe charging in variable ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ51013BRGER | Supports only 4.2V fixed charge voltage; no pin-selectable low-battery disconnect; requires external NTC biasing. | Lacks 4.35V support and configurable disconnect threshold - less flexible for high-capacity or wide-temp Li-ion cells. | Select when cost sensitivity outweighs configurability needs and 4.2V-only operation is acceptable. |
| MP2760GQZ | Includes USB PD input support and I2C interface; higher 500mA max charge current; larger 4mm × 4mm QFN package. | Targets higher-power applications with wired/wireless hybrid input; not suitable for sub-2mm² footprint constraints. | Choose for systems requiring protocol-aware input negotiation and >100mA charging, accepting larger board area. |
Compared with BQ51013BRGER and MP2760GQZ, the LTC4124EV#TRPBF uniquely balances ultra-compact size, pin-strapped flexibility across voltage/current/disconnect thresholds, and zero-leakage ship mode - making it optimal for miniaturized, long-shelf-life wireless devices where external configuration interfaces are undesirable.
Availability
LTC4124EV#TRPBF is available at Aetrix Electronics and suitable for medical wireless sensors, military wearables, virtual reality headsets, IoT edge devices, and streaming Bluetooth headsets requiring stable component supply across extended production lifecycles.
Supply support for LTC4124EV#TRPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC4124EV#TRPBF belongs to Analog Devices' Power Management product line, engineered specifically for ultra-low-power, wirelessly powered portable electronics where size, safety, and battery longevity are primary design constraints.
FAQ
What is the maximum supported charge current for the LTC4124EV#TRPBF?
The LTC4124EV#TRPBF supports a maximum charge current of 100mA, selected by tying both ISEL1 and ISEL2 pins to VCC. This value is specified at 95–103.5mA under typical conditions and is thermally limited by the 2mm × 2mm LQFN package's ability to dissipate power without exceeding 85°C junction temperature.
How does the LTC4124EV#TRPBF implement temperature-qualified charging?
The LTC4124EV#TRPBF uses its NTC pin to monitor a 100kΩ thermistor connected between NTC and GND. Charging pauses when the NTC voltage exceeds 75% of VCC (cold fault) or falls below 35% of VCC (hot fault), resuming only when voltage returns to the 40–70% VCC window. This ensures safe charging across validated battery temperature ranges.
Can the LTC4124EV#TRPBF operate with only DC input, without wireless power?
Yes, the LTC4124EV#TRPBF can operate solely from a DC source applied to the DCIN pin (3.3–5.5V). Its internal diode-OR architecture automatically selects the higher of DCIN or rectified ACIN voltage to power VCC, enabling seamless fallback to wired input when wireless coupling is weak or unavailable.
What happens to the battery when the LTC4124EV#TRPBF enters ship mode?
In ship mode, the LTC4124EV#TRPBF isolates the battery completely, drawing ≤50nA from BAT regardless of voltage level. This eliminates self-discharge during logistics and storage, preserving factory-charged state for up to 10 years - a critical feature for pre-deployed medical and defense devices.
Is the LTC4124EV#TRPBF pin-compatible with other members of the LTC412x family?
No, the LTC4124EV#TRPBF is not pin-compatible with LTC4125 or LTC4126. While sharing functional similarities, each variant has distinct pin assignments (e.g., LTC4125 lacks PRECHG and LBSEL pins), different package footprints, and non-interchangeable programming logic - requiring dedicated PCB layout per part number.
LTC4124EV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Voltage
- Fault Protection:
- -
- Charge Current - Max:
- 100mA
- Battery Pack Voltage:
- 4.0V, 4.1V, 4.2V, 4.35V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- Wireless
- Operating Temperature:
- -20°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC4124EV#TRPBF FAQ
1.How can I place an order for LTC4124EV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4124EV#TRPBF 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 LTC4124EV#TRPBF reliable?
The price and inventory of LTC4124EV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4124EV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4124EV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4124EV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4124EV#TRPBF?
LTC4124EV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4124EV#TRPBF 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 LTC4124EV#TRPBF?
For technical support, including LTC4124EV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4124EV#TRPBF requirements.
6.How does Aetrix verify that LTC4124EV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4124EV#TRPBF 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 LTC4124EV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4124EV#TRPBF?
All LTC4124EV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4124EV#TRPBF, 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 LTC4124EV#TRPBF part is unused and in its original packaging.
Return procedure for LTC4124EV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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