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Analog Devices Inc. LTC4124EV#TRMPBF
- Part No.:
- LTC4124EV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC4124EV#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,360
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Product details
Overview
LTC4124EV#TRMPBF from Analog Devices is a pin-configurable wireless Li-ion battery charger IC with integrated PowerPath™ control, NTC-based temperature qualification, and low-battery disconnect. It delivers up to 100mA charge current, supports 4.0V–4.35V programmable charge voltage, and operates from 2.7V–5.5V VCC. It enables sealed, connectorless charging in medical sensors and VR headsets.
For engineers reviewing the LTC4124EV#TRMPBF datasheet, LTC4124EV#TRMPBF pinout, LTC4124EV#TRMPBF application, or LTC4124EV#TRMPBF equivalent, key selection considerations include wireless power receiver integration, pin-strapped charge parameters (current/voltage/LBD), NTC thermistor interface, and ship-mode ultra-low leakage (<50nA) for long-term storage.
Technical Context
The LTC4124EV#TRMPBF integrates three functional blocks: a wireless power manager that rectifies and regulates ACIN-derived input to VCC using internal diodes and comparators; a full-featured linear CC/CV charger with safety timer, bad-battery detection, and automatic recharge; and an ideal diode PowerPath™ controller that maintains VCC at BAT − 50mV during discharge while enabling seamless mode transitions.
Its operation relies on precise pin-strapping: VSEL1/VSEL2 set final charge voltage (4.0/4.1/4.2/4.35V), ISEL1/ISEL2 select charge current (10/25/50/100mA), LBSEL configures low-battery disconnect (2.7V/3.2V), and PRECHG enables 10% precharge below 68% of final voltage. The NTC input uses 100kΩ thermistor thresholds (75%/35% of VCC) to pause charging outside safe temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Pin-selectable: 10mA/25mA/50mA/100mA - enables optimization for battery capacity and thermal budget without external resistors. |
| Charge Voltage | Pin-selectable: 4.0V/4.1V/4.2V/4.35V - supports legacy and high-density Li-ion chemistries with ±0.061V regulation accuracy. |
| Low Battery Disconnect | Pin-selectable: 2.7V or 3.2V - prevents deep discharge damage; disconnect leakage <50nA ensures multi-year shelf life. |
| NTC Interface | 100kΩ thermistor input with cold/hot thresholds at 75%/35% of VCC - provides robust, self-contained temperature qualification without external ADC. |
| Package | 12-lead 2mm × 2mm × 0.74mm LQFN with exposed GND pad - thermally enhanced for high efficiency in space-constrained wearables. |
| Quiescent Current | 3.5µA battery quiescent current in done-charging state - minimizes parasitic drain during standby in always-on IoT devices. |
| Ship Mode Leakage | 0–50nA total battery current in ship mode - enables factory-charged devices to retain >95% capacity after 12+ months storage. |
Pinout & Package
Package: 12-lead LQFN (2mm × 2mm × 0.74mm) with exposed GND pad (Pin 13), RoHS-compliant Au finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | System supply rail | Regulated output derived from ACIN or DCIN; powers internal circuitry and loads; includes 2.2µF internal capacitor. |
| CHRG (2) | Open-drain status indicator | Four-state LED driver: high-Z (no power), slow blink (charging), fast blink (fault), pull-down (charge complete). |
| PRECHG (3) | Precharge enable control | Tie to VCC to activate 10% precharge below 68% of final voltage; tie to GND to disable and deliver full current immediately. |
| VSEL1/VSEL2 (4,5) | Charge voltage programming bits | Binary strap inputs selecting 4.0V/4.1V/4.2V/4.35V final charge voltage per Table 2 in datasheet. |
| ISEL1/ISEL2 (6,7) | Charge current programming bits | Binary strap inputs selecting 10mA/25mA/50mA/100mA constant-current level per Table 3. |
| LBSEL (8) | Low-battery disconnect threshold select | High = 3.2V disconnect; Low = 2.7V disconnect - determines minimum safe operating voltage before shutdown. |
| NTC (9) | Thermistor input | Connects to 100kΩ NTC to GND; internal 100kΩ pull-up enables cold/hot detection without external biasing. |
| BAT (10) | Battery connection | Direct connection to single-cell Li-ion anode; integrates charge switch (RCHG = 0.5Ω) and discharge path (RDISCHG = 0.5Ω). |
| ACIN (11) | Wireless AC input | Connects to LC tank (receive coil + capacitor); internal diode rectifies AC to VCC; short to GND if unused. |
| DCIN (12) | Optional DC input | 3.3–5.5V auxiliary supply; diode-ORed with ACIN to VCC; short to GND if unused. |
| GND (13) | Ground reference & thermal pad | Exposed pad must be soldered to PCB ground plane for electrical integrity and θJA = 92°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Wireless + DC dual-input architecture | ACIN and DCIN diode-ORed to VCC enables seamless transition between wireless charging and wired backup power. |
| Pin-strapped configuration | No external resistors needed - all critical parameters (charge current/voltage, LBD, precharge) set via logic-level straps. |
| Safety-qualified charging | Integrated NTC interface, 3-hour C/10 termination timer, bad-battery detection (45min timeout), and UVCL protection prevent overcharge/overheat. |
| Ultra-low-power ship mode | Sub-50nA battery leakage in ship mode allows factory-charged devices to retain >95% capacity for ≥12 months. |
| PowerPath™ ideal diode control | Maintains VCC at BAT − 50mV during discharge, enabling efficient battery-to-load power delivery without external MOSFETs. |
Applications
| Medical Wireless Sensors | Military Wearables |
|---|---|
|
Use Scenario: Implantable or epidermal biosensors requiring hermetic sealing and zero-exposed contacts. IC Role / Device Role / Timing Role: Wireless power receiver, Li-ion charger, and battery-powered system supervisor. Use Value: Eliminates connectors vulnerable to moisture ingress; 2.7V low-battery disconnect prevents cell degradation during field deployment. |
Use Scenario: Ruggedized tactical headsets used in extreme environments with frequent thermal cycling. IC Role / Device Role / Timing Role: Temperature-qualified wireless charger with automatic recharge and ship-mode preservation. Use Value: NTC-based cold/hot detection pauses charging outside −20°C to +60°C; 50nA ship-mode leakage ensures readiness after long-term storage. |
| Virtual Reality Headsets | IoT Edge Nodes |
|
Use Scenario: High-end VR headsets needing rapid, connectorless recharging between user sessions. IC Role / Device Role / Timing Role: Integrated wireless receiver, 100mA Li-ion charger, and PowerPath™ load switch. Use Value: 100mA charge current enables <3-hour full recharge; 2mm × 2mm package fits within tight mechanical envelopes. |
Use Scenario: Battery-powered environmental monitors deployed in remote locations with infrequent maintenance. IC Role / Device Role / Timing Role: Ultra-low-quiescent charger with automatic recharge and long-term storage optimization. Use Value: 3.5µA battery quiescent current extends operational life; ship mode preserves charge for >12 months in logistics chain. |
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 | Requires external current-sense resistor; no integrated NTC interface; fixed 4.2V charge voltage; 500mA max charge current. | Targets higher-power applications; lacks pin-selectable LBD and ship mode; requires more BOM components. | Choose for cost-sensitive designs needing >100mA charge current and where external thermistor conditioning is acceptable. |
| MAX77734EWL+ | Switch-mode architecture (higher efficiency); integrates fuel gauge; requires I²C configuration; 3.2V fixed LBD. | Designed for complex portable systems with host MCU control; not pin-compatible; larger solution size. | Choose when system-level intelligence (fuel gauging, dynamic parameter updates) justifies added complexity and footprint. |
Compared with BQ51013BRGER and MAX77734EWL+, the LTC4124EV#TRMPBF offers unique value in ultra-compact, resistorless, pin-configured wireless charging with guaranteed sub-50nA ship-mode leakage and dual-voltage LBD - critical for sealed, long-life, low-maintenance devices.
Availability
LTC4124EV#TRMPBF is available at Aetrix Electronics and suitable for medical wireless sensors, military wearables, virtual reality headsets, IoT edge nodes, and streaming Bluetooth headsets requiring stable component supply across production lifecycles.
Supply support for LTC4124EV#TRMPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC4124EV#TRMPBF belongs to Analog Devices' Power Management product line, designed specifically for compact, reliable wireless charging in space- and power-constrained portable electronics.
FAQ
What is the function of the PRECHG pin on the LTC4124EV#TRMPBF?
The PRECHG pin on the LTC4124EV#TRMPBF enables or disables low-current precharge (trickle charge) for deeply discharged batteries. When tied to VCC, it activates 10% of the programmed charge current below 68% of the final charge voltage. When tied to GND, full charge current is delivered immediately. Leaving the pin floating is not allowed and may cause undefined behavior in the LTC4124EV#TRMPBF.
How does the LTC4124EV#TRMPBF achieve ultra-low battery leakage in ship mode?
The LTC4124EV#TRMPBF achieves ship mode by applying 1.5V simultaneously to ACIN and DCIN while in ideal diode mode, triggering internal logic that opens all battery paths. In this state, total battery current is guaranteed ≤50nA across temperature, preserving >95% of charge after 12 months - a key differentiator of the LTC4124EV#TRMPBF for factory-shipped devices.
Can the LTC4124EV#TRMPBF operate with only DC input, without wireless power?
Yes, the LTC4124EV#TRMPBF supports standalone DC operation via the DCIN pin (3.3V–5.5V). Its internal diode-OR architecture automatically selects the higher of DCIN or rectified ACIN voltage to power VCC. When ACIN is unused, it must be shorted to GND per datasheet requirements to ensure proper operation of the LTC4124EV#TRMPBF.
What is the purpose of the NTC pin on the LTC4124EV#TRMPBF, and how is it configured?
The NTC pin on the LTC4124EV#TRMPBF interfaces with a 100kΩ NTC thermistor to enable temperature-qualified charging. It uses internal comparators with 75% VCC (cold) and 35% VCC (hot) thresholds to pause charging outside safe ranges. To disable the feature, connect NTC directly to VCC - no external components are required for basic operation of the LTC4124EV#TRMPBF.
How does the LTC4124EV#TRMPBF handle low input power conditions during wireless charging?
The LTC4124EV#TRMPBF implements undervoltage current limiting (UVCL): as VCC drops toward 3.4V, it gradually reduces charge current to prevent oscillatory shutdown. Below 3.45V, the CHRG pin blinks fast (6Hz) to indicate UVCL fault. This avoids intermittent charging caused by marginal coupling - a robustness feature built into the LTC4124EV#TRMPBF's wireless power manager.
LTC4124EV#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC4124EV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4124EV#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC4124EV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4124EV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4124EV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4124EV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4124EV#TRMPBF?
LTC4124EV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4124EV#TRMPBF 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#TRMPBF?
For technical support, including LTC4124EV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4124EV#TRMPBF requirements.
6.How does Aetrix verify that LTC4124EV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4124EV#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4124EV#TRMPBF?
All LTC4124EV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4124EV#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4124EV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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