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Analog Devices Inc. LTC4126EV-10#TRMPBF
- Part No.:
- LTC4126EV-10#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC4126EV-10#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:902
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Product details
Overview
LTC4126EV-10#TRMPBF from Analog Devices is a 10mA wireless single-cell Li-Ion battery charger with integrated 1.2V step-down charge-pump DC/DC regulator, NTC-based temperature monitoring, pin-selectable 4.1V/4.2V charge voltage, and 3-hour safety timer - designed for ultra-compact hearing aid power systems.
For engineers reviewing the LTC4126EV-10#TRMPBF datasheet, LTC4126EV-10#TRMPBF pinout, LTC4126EV-10#TRMPBF application, or LTC4126EV-10#TRMPBF equivalent, this device delivers verified wireless charging + regulated low-noise 1.2V supply in a thermally enhanced 2mm × 2mm LQFN package with confirmed 12-pin terminal mapping and documented differential undervoltage lockout (DUVLO), DUVCL, and multi-mode DC/DC operation.
Technical Context
The LTC4126EV-10#TRMPBF integrates three functional blocks: an AC rectifier with overvoltage limit (5.5V typical VCC(HIGH)), a full CC/CV linear Li-Ion charger (10mA fixed ICHG, 4.1V/4.2V VCHG), and a multi-mode charge-pump DC/DC regulator delivering 1.2V output across three battery-voltage-dependent modes (3:1 regulated, 3:1 open-loop, 2:1 regulated).
Its operational intelligence includes differential undervoltage protection (ΔVUVLO = 27mV/80mV), graded current limiting (DUVCL active between ~154mV–116mV VCC–VBAT), temperature-qualified charging via NTC pin (VCOLD = 62%VCC, VHOT = 34.9%VCC), and pushbutton/digital EN control of the DC/DC stage - all coordinated by internal logic with status reporting via CHRG, STAT1/STAT2, and ACPR pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Fixed 10mA - eliminates external current-setting components and ensures predictable thermal profile in space-constrained hearing aids. |
| Charge Voltage | PIN-selectable 4.1V or 4.2V - supports battery chemistry variants without redesign; VSEL logic high = 4.2V, low = 4.1V. |
| DC/DC Output | Regulated 1.2V ±40mV (1.16V–1.24V) at IOUT = 0 - powers low-voltage hearing aid ASICs with minimal noise in audible band. |
| DC/DC Switching Frequency | 50kHz (3:1 mode) or 75kHz (2:1 mode) - avoids audible noise while enabling compact external capacitor selection. |
| Battery Disconnect Threshold | 3.0V ±70mV (VDISCONNECT) - prevents deep discharge damage and enables safe ship-mode behavior. |
| NTC Fault Thresholds | VCOLD = 62.0%VCC (rising), VHOT = 34.9%VCC (falling), 1.5% hysteresis - implements precise 0°C–40°C safe-charge window per Li-Ion spec. |
| Safety Timer | 3.0 hours ±30 min (tTERMINATE) - guarantees charge termination even under weak coupling or degraded battery conditions. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed GND pad (Pin 13), θJA = 92°C/W, MSL Level 3, RoHS-compliant Au (e4) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTC (1) | Thermistor bias input | Monitors battery temperature via external NTC network; suspends charging if VCOLD/VHOT thresholds violated. |
| EN (2) | Digital enable input | Logic-low (≤0.4V) enables DC/DC; internal 1MΩ pull-up to BAT allows unconnected default-enable. |
| PBEN (3) | Pushbutton toggle input | Ground-triggered toggle for DC/DC on/off; ignored if EN is low; internal weak pull-up ensures default high. |
| VSEL (4) | Charge voltage select | Logic-high = 4.2V VCHG, logic-low = 4.1V VCHG; must not be left floating. |
| ACPR (5) | Input power availability indicator | CMOS output referenced to OUT; high = VCC–VBAT ≥80mV (typ), low = ≤27mV (typ); requires DC/DC enabled. |
| CHRG (6) | Open-drain charge status | Four-state indication: Hi-Z (no power), slow blink (charging), fast blink (fault), pulled low (done); 300µA pull-down. |
| ACIN (7) | AC receive coil input | Connects to external LC tank; internal rectifier converts induced AC to VCC; short to GND if unused. |
| BAT (8) | Battery connection | Single-cell Li-Ion interface; supplies both charger and DC/DC; requires 1µF decoupling when DC/DC active. |
| STAT2 (9), STAT1 (10) | Charging state logic outputs | CMOS outputs referenced to OUT; encode charge/fault states per Table 1; inactive if DC/DC disabled. |
| VCC (11) | Rectified DC input | Output of internal AC rectifier; also accepts external DC supply; clamped at 5.5V (typ) by VCC(HIGH). |
| OUT (12) | DC/DC regulated output | Delivers 1.2V to load; requires ≥2.2µF low-ESR ceramic capacitor placed adjacent to pin. |
| GND (13) | Ground reference & thermal pad | Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal dissipation (θJA = 92°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated wireless receiver + charger + regulator | Eliminates need for separate AC-DC, battery management, and voltage regulation ICs - reduces BOM count and board area by >40% in hearing aids. |
| Multi-mode charge-pump DC/DC | Three operating modes (3:1 regulated, 3:1 open-loop, 2:1 regulated) maintain usable 1.2V output across full 2.7V–4.4V battery range. |
| Differential undervoltage current limiting (DUVCL) | Gradually scales charge current from 10mA → 0mA as VCC–VBAT drops from 154mV → 116mV - prevents oscillatory charging under marginal coupling. |
| Temperature-qualified charging | Hardware-based NTC monitoring with cold/hot comparators and hysteresis - ensures compliance with IEC 62368-1 and UL 2054 battery safety requirements. |
| Low-quiescent-current ship mode | IBATQ = 4–8µA (charging done, DC/DC off, VBAT = 4.4V) - extends shelf life of pre-charged hearing aid batteries up to 18 months. |
Applications
| Hearing Aid Power System | Wireless Charging Earbud |
|---|---|
|
Use Scenario: Compact in-ear hearing aid requiring wireless charging and ultra-low-noise 1.2V supply for audio DSP. IC Role / Device Role / Timing Role: Single-chip wireless receiver, Li-Ion charger, and regulated DC/DC converter - replaces discrete rectifier, linear charger, and LDO. Use Value: Enables <25mm² total solution size, eliminates audible switching noise in audio path, and satisfies medical-grade battery safety via hardware NTC monitoring. |
Use Scenario: True wireless stereo (TWS) earbud with sealed enclosure where wired charging is impractical. IC Role / Device Role / Timing Role: Wireless power receiver and battery management unit - handles AC rectification, CC/CV charging, and system rail generation. Use Value: Supports 10mA charging current compatible with small-form-factor 30–50mAh Li-Ion cells, with automatic recharge and 3-hour safety timer preventing overcharge. |
| IoT Wearable Sensor Node | Low-Power Medical Patch |
|
Use Scenario: Coin-cell-sized wearable sensor collecting biometric data with intermittent BLE transmission. IC Role / Device Role / Timing Role: Energy-harvesting interface and battery conditioner - converts ambient RF/wireless power into stable 1.2V system rail and manages Li-Ion health. Use Value: Delivers up to 60mA DC/DC output at >85% efficiency (VBAT = 3.8V), with low 50µA VCC quiescent current extending runtime between charges. |
Use Scenario: Disposable ECG patch worn for 72+ hours requiring reliable battery voltage supervision and temperature-safe charging. IC Role / Device Role / Timing Role: Safety-critical battery management IC - enforces 0°C–40°C charging window, disconnects at 3.0V, and reports faults via CHRG/STAT pins. Use Value: Meets ISO 14971 risk management requirements through hardware-implemented DUVLO, DUVCL, and NTC fault detection - no firmware dependency. |
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 | 500mA max charge current, 4.2V only, no integrated DC/DC, requires external LDO for system rail | Targets higher-power wearables (e.g., smartwatches); lacks 1.2V regulator and NTC hardware safety logic | Select when >10mA charging and external regulation are acceptable; avoid for hearing aids requiring integrated 1.2V rail. |
| MAX77734EWL+ | Switch-mode buck-boost DC/DC (1.2V @ 1A), 500mA charger, no wireless receiver, no NTC pin | Designed for USB-powered portable devices; no ACIN interface or DUVCL/DUVLO circuitry | Choose for high-current battery-powered systems with wired input; not suitable for wireless-only or safety-critical medical use. |
Compared with BQ51013BRGER and MAX77734EWL+, the LTC4126EV-10#TRMPBF uniquely combines wireless AC reception, 10mA Li-Ion charging, hardware NTC safety, and integrated 1.2V charge-pump DC/DC in a 2mm × 2mm footprint - making it the only validated solution for miniaturized, medically compliant hearing aid power architectures.
Availability
LTC4126EV-10#TRMPBF is available at Aetrix Electronics and suitable for hearing aid manufacturing, wireless earbud production, and low-power medical wearable design requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4126EV-10#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, communications, and healthcare markets.
The LTC4126-10 belongs to Analog Devices' wireless power management product line, engineered specifically for ultra-low-power, safety-critical, space-constrained medical and hearing aid applications where integration, reliability, and regulatory compliance are mandatory.
FAQ
What is the exact charge current and voltage accuracy of the LTC4126EV-10#TRMPBF?
The LTC4126EV-10#TRMPBF delivers a fixed 10mA charge current with ±10% tolerance (9.0–11.5mA) and pin-selectable charge voltage: 4.200V ±42mV (VSEL = 1) or 4.100V ±41mV (VSEL = 0), both specified over –20°C to 85°C junction temperature. These values are measured per the Electrical Characteristics table in the official datasheet Rev. 0.
How does the LTC4126EV-10#TRMPBF handle weak magnetic coupling during wireless charging?
The LTC4126EV-10#TRMPBF uses differential undervoltage current limiting (DUVCL) to gracefully scale charge current from 10mA down to zero as the VCC–VBAT differential falls from ~154mV to ~116mV - preventing the oscillatory on/off behavior that would occur with hard DUVLO cutoff alone. This ensures stable partial charging under marginal coupling conditions.
Can the LTC4126EV-10#TRMPBF operate without the NTC thermistor connected?
Yes - grounding the NTC pin (Pin 1) disables all temperature monitoring functionality in the LTC4126EV-10#TRMPBF, allowing normal charging and DC/DC operation. However, this voids temperature-qualified charging compliance and is not recommended for medical or safety-certified designs per IEC 62368-1.
What are the DC/DC output capabilities of the LTC4126EV-10#TRMPBF across battery voltage range?
The LTC4126EV-10#TRMPBF provides 1.2V regulated output up to 60mA when VBAT > 3.6V (3:1 mode) or VBAT < 3.3V (2:1 mode); between 3.3V–3.6V, it delivers VBAT/3 open-loop output with ROL ≈ 4.6Ω. Minimum guaranteed VOUT is 1.16V at IOUT = 0 and VBAT > VLOBAT2.
Is the LTC4126EV-10#TRMPBF pin-compatible with other members of the LTC4126 family?
No - the LTC4126EV-10#TRMPBF is the evaluation board variant (EV) of the LTC4126-10, not a production part. The production-grade equivalent is LTC4126-10#TRPBF (tape-and-reel) or LTC4126-10#TRMPBF (mini-reel). All share identical pinout, package, and electrical behavior per datasheet Rev. 0.
LTC4126EV-10#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 Features:
- Voltage
- Fault Protection:
- Undervoltage
- Charge Current - Max:
- 10mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC4126EV-10#TRMPBF FAQ
1.How can I place an order for LTC4126EV-10#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4126EV-10#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 LTC4126EV-10#TRMPBF reliable?
The price and inventory of LTC4126EV-10#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4126EV-10#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4126EV-10#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4126EV-10#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4126EV-10#TRMPBF?
LTC4126EV-10#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4126EV-10#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 LTC4126EV-10#TRMPBF?
For technical support, including LTC4126EV-10#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4126EV-10#TRMPBF requirements.
6.How does Aetrix verify that LTC4126EV-10#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4126EV-10#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 LTC4126EV-10#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4126EV-10#TRMPBF?
All LTC4126EV-10#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4126EV-10#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 LTC4126EV-10#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4126EV-10#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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