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Analog Devices Inc. LTC4126EV-10#TRPBF
- Part No.:
- LTC4126EV-10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC4126EV-10#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
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Product details
Overview
LTC4126EV-10#TRPBF from Analog Devices is a 10mA wireless single-cell Li-Ion battery charger with integrated 1.2V step-down multi-mode charge pump DC/DC regulator, designed for hearing aid ASIC power delivery. It features pin-selectable 4.1V/4.2V charge voltage, 3-hour safety timer termination, NTC-based temperature qualified charging, and low-battery disconnect at 3.0V.
For engineers reviewing the LTC4126EV-10#TRPBF datasheet, LTC4126EV-10#TRPBF pinout, LTC4126EV-10#TRPBF application, or LTC4126EV-10#TRPBF equivalent, key selection considerations include its 2mm × 2mm LQFN package, dual-mode (3:1/2:1) charge pump operation, differential undervoltage current limiting (DUVCL), ACPR status indication, and simultaneous charging + regulated 1.2V output capability.
Technical Context
The LTC4126EV-10#TRPBF integrates three core subsystems: an AC rectification and input power controller for wireless energy harvesting (via ACIN), a full-featured linear CC/CV Li-Ion charger with automatic recharge and temperature fault suspension, and a proprietary low-noise multi-mode charge pump DC/DC regulator delivering 1.2V up to 60mA. Its switching frequency is dynamically set to 50kHz or 75kHz to avoid audible noise.
Operation spans three battery-voltage-dependent DC/DC modes: regulated 3:1 step-down (VBAT > 3.6V), open-loop 3:1 (3.3V < VBAT ≤ 3.6V, VOUT = VBAT/3 – IOUT·ROL), and regulated 2:1 step-down (VBAT ≤ 3.3V). The DUVCL circuit continuously modulates charge current between ~4.1mA and 10mA as VCC–VBAT drops from 154mV to 116mV, preventing oscillatory charging under marginal coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Fixed 10mA - enables compact, low-power charging suitable for hearing aids with minimal thermal impact. |
| DC/DC Output Voltage | Regulated 1.2V (±40mV) - powers ultra-low-voltage hearing aid ASICs directly without external LDO. |
| DC/DC Max Output Current | 60mA in 3:1 mode, ≥35mA in 2:1 mode - supports typical hearing aid system loads across full battery range. |
| Charge Voltage Selection | PIN-selectable 4.1V or 4.2V - accommodates cell chemistry requirements without firmware change. |
| Battery Disconnect Threshold | 3.0V ±70mV - prevents deep discharge and preserves Li-Ion cycle life in portable wearables. |
| NTC Temperature Monitoring | VCOLD = 62% VCC (rising), VHOT = 34.9% VCC (falling), 1.5% hysteresis - implements safe 0°C–40°C charging window per Li-Ion spec. |
| Safety Timer | 3.0 hours ±30 minutes - guarantees charge termination even if voltage threshold not reached, critical for medical-grade reliability. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed GND pad (Pin 13), RoHS-compliant Au finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTC (1) | Thermistor bias input | Monitors battery temperature via external NTC/resistor divider; suspends charging outside safe range. |
| EN (2) | Digital enable control | Logic-low (≤0.4V) enables DC/DC; internal 1MΩ pull-up to BAT allows pushbutton-only use when unconnected. |
| PBEN (3) | Pushbutton toggle input | Ground-triggered toggle for DC/DC on/off; ignored if EN is low - supports mechanical power control. |
| VSEL (4) | Charge voltage select | Logic-high → 4.2V, logic-low → 4.1V; must be driven - no floating allowed. |
| ACPR (5) | Input power availability indicator | CMOS output referenced to OUT; high when VCC–VBAT > 80mV, low when < 27mV - signals usable wireless power. |
| CHRG (6) | Open-drain charge status | Four-state LED driver: Hi-Z (no power), slow blink (charging), fast blink (fault), pulled low (done). |
| ACIN (7) | AC receive coil interface | Connects to external LC tank; internal rectifier converts magnetic field energy to VCC supply. |
| BAT (8) | Battery connection | Single-cell Li-Ion anode; powers DC/DC and receives charge current; requires 1µF decoupling when DC/DC active. |
| STAT2 (9), STAT1 (10) | Dual CMOS status outputs | Encode charge state (e.g., done, charging, faults); referenced to OUT - only active when DC/DC enabled. |
| VCC (11) | DC input / rectified AC output | Rectified voltage from ACIN or direct DC source; clamped at 5.5V max; powers internal circuitry. |
| OUT (12) | DC/DC regulated output | 1.2V supply for load; requires ≥2.2µF ceramic capacitor; drives hearing aid ASICs directly. |
| 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 |
|---|---|
| Multi-mode charge pump DC/DC | Automatically switches between regulated 3:1 (VBAT > 3.6V), open-loop 3:1 (3.3V < VBAT ≤ 3.6V), and regulated 2:1 (VBAT ≤ 3.3V) to sustain 1.2V output across full battery range. |
| Differential Undervoltage Current Limit (DUVCL) | Gradually reduces charge current from 10mA to ~4mA as VCC–VBAT falls from 154mV to 116mV - eliminates oscillatory charging under weak coupling. |
| Integrated AC rectification | On-chip rectifier with overvoltage limit (5.5V) eliminates need for external diodes or TVS, reducing BOM count in wireless receiver designs. |
| Low-noise 50/75kHz switching | Switching frequencies placed outside audible band (20Hz–20kHz) prevent acoustic interference in hearing aids and audio wearables. |
| Simultaneous charging & powering | Charger and DC/DC operate concurrently - enables real-time system operation during wireless charging, critical for always-on medical devices. |
Applications
| Hearing Aid Power System | Wireless Charging Earbud |
|---|---|
Use Scenario: Compact, battery-powered hearing aid requiring continuous 1.2V supply for DSP and RF ICs while wirelessly recharged via inductive base. IC Role / Device Role / Timing Role: Single-chip solution providing regulated 1.2V rail from Li-Ion battery and managing wireless charging with temperature safety. Use Value: Eliminates separate LDO and charger ICs; 2mm × 2mm footprint enables ultra-small form factor; DUVCL ensures stable charging despite coil misalignment. |
Use Scenario: True wireless stereo (TWS) earbud with inductive charging case, needing reliable low-power charging and clean 1.2V supply for Bluetooth SoC. IC Role / Device Role / Timing Role: Wireless Li-Ion charger + system power regulator; manages charge termination, battery disconnect, and status signaling via CHRG/STAT pins. Use Value: Reduces component count and PCB area; NTC monitoring prevents overheating during rapid charging; 3-hour timer avoids overcharge risk in sealed enclosure. |
| IoT Wearable Sensor Node | Medical Patch Monitor |
Use Scenario: Small wearable sensor patch powered by coin-cell-sized Li-Ion, recharged wirelessly through clothing or docking station. IC Role / Device Role / Timing Role: Low-quiescent-current (4–8µA BAT IQ) charger and 1.2V regulator enabling multi-week battery life between charges. Use Value: Ultra-low standby current extends shelf life; PBEN/EN dual control supports user-initiated power-on; ACPR provides coupling quality feedback to host MCU. |
Use Scenario: Disposable or reusable medical patch monitoring vital signs, requiring certified safe charging and precise battery management. IC Role / Device Role / Timing Role: Safety-critical Li-Ion charger with temperature qualification, undervoltage lockout, and fault-indicating status outputs (CHRG, STAT1/2). Use Value: Meets ISO 13485 design controls via hardware-enforced safety limits (3h timer, 3.0V disconnect, NTC fault pause); RoHS-compliant Au-finish LQFN supports biocompatible assembly. |
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 | Inductive receiver with integrated 500mA charger; no built-in DC/DC regulator; requires external 1.2V LDO; larger 3mm × 3mm QFN package. | Targets higher-power wearables (e.g., smartwatches); lacks integrated regulated low-voltage rail and NTC temperature qualification. | Select when >100mA charging or legacy Qi compliance is required; avoid when space-constrained or 1.2V direct regulation is needed. |
| MAX77734EWL+T | Ultra-low-IQ buck-boost regulator (1.2V @ 300mA) with standalone charger controller; no wireless front-end; requires external AC-DC rectifier and coil driver. | Designed for wired USB-C or adapter-powered systems; no ACIN interface or DUVCL; supports wider input range (2.5V–5.5V). | Select for hybrid wired/wireless systems needing higher output current; avoid for pure wireless receiver applications due to missing AC rectification and coupling monitoring. |
Compared with BQ51013BRGER and MAX77734EWL+T, the LTC4126EV-10#TRPBF uniquely integrates wireless AC reception, 10mA Li-Ion charging, and 1.2V regulated output in a 2mm × 2mm package - making it optimal for miniaturized, battery-limited medical and audio wearables where concurrent charging and system power are mandatory.
Availability
LTC4126EV-10#TRPBF is available at Aetrix Electronics and suitable for hearing aid manufacturing, wireless earbud production, and IoT wearable development requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for LTC4126EV-10#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, 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 LTC4126EV-10#TRPBF belongs to Analog Devices' Power Management product line, specifically engineered for ultra-low-power, space-constrained wireless charging applications in medical and audio wearables - emphasizing integration, safety, and minimal external components.
FAQ
What is the primary function of the LTC4126EV-10#TRPBF?
The LTC4126EV-10#TRPBF is a fully integrated wireless Li-Ion battery charger and 1.2V step-down DC/DC regulator in a single 2mm × 2mm LQFN package. Its primary function is to receive power wirelessly via ACIN, charge a single-cell Li-Ion battery at 10mA with temperature and safety monitoring, and simultaneously deliver a regulated 1.2V output to power hearing aid ASICs or other ultra-low-voltage loads.
How does the LTC4126EV-10#TRPBF handle low wireless coupling conditions?
The LTC4126EV-10#TRPBF uses Differential Undervoltage Current Limiting (DUVCL) to gracefully manage low coupling: as VCC–VBAT drops from ~154mV to ~116mV, charge current is smoothly reduced from 10mA toward ~4.1mA. This prevents the oscillatory on/off behavior seen with basic DUVLO circuits and maintains stable charging even with misaligned coils - a key advantage of the LTC4126EV-10#TRPBF in real-world wearable deployments.
Can the LTC4126EV-10#TRPBF operate without wireless power input?
Yes, the LTC4126EV-10#TRPBF can operate with direct DC power applied to the VCC pin - bypassing the ACIN wireless front-end entirely. In this configuration, the internal rectifier is inactive, and the device functions as a standard 10mA Li-Ion charger with integrated 1.2V DC/DC regulator. The ACIN pin must be grounded when using DC-only operation to ensure proper functionality of the LTC4126EV-10#TRPBF.
What is the role of the ACPR pin on the LTC4126EV-10#TRPBF?
The ACPR pin on the LTC4126EV-10#TRPBF is a CMOS logic output that indicates whether sufficient input power is available to initiate charging: it goes high when VCC–VBAT exceeds ~80mV (typical) and low when the differential falls below ~27mV (typical). Because its high level is referenced to the OUT pin voltage, ACPR is only functional when the DC/DC converter is enabled - providing system-level feedback on wireless coupling quality for the LTC4126EV-10#TRPBF.
Does the LTC4126EV-10#TRPBF support automatic recharge after termination?
Yes, the LTC4126EV-10#TRPBF supports automatic recharge: once the 3-hour safety timer terminates charging, the device enters low-quiescent-current mode (~4–8µA BAT IQ). If the battery voltage subsequently drops below VRECHRG (typically 97.5% of the selected charge voltage), a new charge cycle automatically begins - ensuring the battery remains topped off without host MCU intervention, a critical feature for maintenance-free wearables using the LTC4126EV-10#TRPBF.
LTC4126EV-10#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 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#TRPBF FAQ
1.How can I place an order for LTC4126EV-10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4126EV-10#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 LTC4126EV-10#TRPBF reliable?
The price and inventory of LTC4126EV-10#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4126EV-10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4126EV-10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4126EV-10#TRPBF?
LTC4126EV-10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4126EV-10#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 LTC4126EV-10#TRPBF?
For technical support, including LTC4126EV-10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4126EV-10#TRPBF requirements.
6.How does Aetrix verify that LTC4126EV-10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4126EV-10#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 LTC4126EV-10#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4126EV-10#TRPBF?
All LTC4126EV-10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4126EV-10#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 LTC4126EV-10#TRPBF part is unused and in its original packaging.
Return procedure for LTC4126EV-10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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