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Analog Devices Inc. LTC4123EDC#TRPBF
- Part No.:
- LTC4123EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4123EDC#TRPBF.pdf
- Description:
- IC BATT CHG NIMH 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,009
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Product details
Overview
LTC4123EDC#TRPBF from Analog Devices (formerly Linear Technology) is a low-power wireless NiMH battery charger IC with integrated AC rectification, constant-current/constant-voltage regulation, and temperature-compensated 1.5V charge voltage. It delivers up to 25mA charge current, operates down to 2.2V input, and features Zinc-Air detection, reverse polarity protection, and thermal fault management - designed specifically for sealed hearing aid enclosures.
For engineers reviewing the LTC4123EDC#TRPBF datasheet, LTC4123EDC#TRPBF pinout, LTC4123EDC#TRPBF application, or LTC4123EDC#TRPBF equivalent, key selection considerations include its 2mm × 2mm DFN-6 package, 6-hour timer-based termination, ±15mV charge voltage accuracy over –5°C to 70°C, and dual-mode power input (wireless ACIN or DC VCC).
Technical Context
The LTC4123EDC#TRPBF integrates a synchronous rectifier and linear charging controller optimized for single-cell NiMH batteries in space-constrained, hermetically sealed devices. Its ACIN-to-VCC rectification path includes overvoltage limiting (5V clamp), while the BAT regulation loop uses a negative temperature coefficient (–2.5mV/°C) reference to maintain optimal state-of-charge across ambient conditions.
Charge control logic implements three distinct operational states: Zinc-Air/reverse-polarity fault detection (80s window, 1.65V threshold), undervoltage current limiting (2.2V UVCL), and thermal pause (–5°C to 70°C die range). The CHRG pin provides four-state open-drain status signaling - slow blink (charging), pull-down (complete), fast blink (fault), or high-Z (no power).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 1.5075V at 25°C, ±15mV accuracy from –5°C to 70°C - ensures safe NiMH full-charge without overvoltage stress. |
| Max Charge Current | 25mA (RPROG = 953Ω) - programmable via single external resistor; supports hearing aid battery capacity requirements. |
| Input Voltage Range | VCC: 2.2V to 5V - enables operation from weak wireless coupling or low-voltage DC sources. |
| UVLO Threshold | 1.95V (typ), 40mV hysteresis - prevents erratic startup during marginal power delivery. |
| Thermal Fault Range | Hot: 70°C rising, Cold: –5°C falling - pauses charging to protect battery and IC reliability. |
| Zinc-Air Detection | 1.65V threshold within 80s - blocks charging of non-rechargeable batteries to prevent venting or rupture. |
| Quiescent Current | 125–200µA (VCC only, no charge) - minimizes standby drain in always-on wearable systems. |
Pinout & Package
Thermally enhanced 6-lead (2mm × 2mm) plastic DFN package with exposed pad (Pin 7) tied to GND. Requires soldering of exposed pad to PCB ground plane for rated θJA = 80.6°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ACIN (Pin 1) | AC input node | Connects to resonant LC tank (receive coil + capacitor); internal diode rectifies induced AC to VCC. |
| VCC (Pin 2) | DC supply output | Rectified or externally supplied power rail; clamped to 5V max; requires 4.7µF bypass capacitor. |
| CHRG (Pin 3) | Open-drain status indicator | 340µA pull-down current source; signals charging state (slow/fast blink, on, or high-Z) for LED feedback. |
| PROG (Pin 4) | Current programming input | 0.25V servo voltage; sets ICHG = 24V/RPROG - enables precise 1mA–25mA linear charge current tuning. |
| BAT (Pin 5) | NiMH battery connection | Regulated 1.5V output with –2.5mV/°C tempco; monitors battery voltage for fault detection and CV mode transition. |
| GND (Pin 6 + Exposed Pad 7) | Reference and thermal path | Primary ground return; exposed pad must be soldered to PCB copper for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated wireless rectifier | Eliminates external diode bridge; ACIN-to-VCC drop ≤0.65V at –20mA - reduces component count and losses in tiny form factors. |
| Temperature-compensated CV | –2.5mV/°C coefficient maintains ±15mV charge voltage accuracy from –5°C to 70°C - prevents NiMH overcharge across operating environments. |
| Zinc-Air & reverse polarity detection | Hardware-level fault sensing (1.65V/–50mV thresholds) disables charging before damage occurs - critical for medical device safety compliance. |
| 6-hour timer-based termination | Fixed TCHG = 4.8–7.2 hours - provides fail-safe cutoff independent of battery impedance drift or aging. |
| Low minimum input voltage | 2.2V VCC operation - sustains charging under poor magnetic coupling or low-efficiency coil alignment. |
Applications
| Hearing Aids | Smart Cards |
|---|---|
Use Scenario: Sealed, miniaturized hearing aids requiring maintenance-free charging through plastic housing without connectors. IC Role / Device Role / Timing Role: Wireless receiver and linear NiMH charger; regulates 1.5V/25mA charge profile with thermal and chemistry fault protection. Use Value: Enables fully encapsulated design with IP67-rated enclosure integrity and zero mechanical wear from repeated plug insertion. |
Use Scenario: Contactless smart cards with embedded rechargeable NiMH battery for extended active RFID functionality. IC Role / Device Role / Timing Role: Low-quiescent wireless charging controller; manages charge termination and battery health monitoring in ultra-thin card profiles. Use Value: Supports >500 charge cycles with Zinc-Air detection preventing accidental charging of disposable variants - essential for field-deployed secure tokens. |
| Fitness Trackers | Moving Equipment Sensors |
Use Scenario: Wearable fitness bands where user cannot access battery compartment for cable charging. IC Role / Device Role / Timing Role: Compact wireless charging interface; handles variable coupling due to wrist motion and skin contact during charging. Use Value: Delivers consistent 25mA charge current despite air-gap fluctuations - eliminates need for precise alignment fixtures in consumer use. |
Use Scenario: Rotating industrial sensors (e.g., motor shaft monitors) requiring continuous power without slip rings or brushes. IC Role / Device Role / Timing Role: Wireless power receiver IC; rectifies and conditions energy from stationary transmit coil to rotating receiver assembly. Use Value: Enables maintenance-free operation in harsh environments by eliminating mechanical contacts prone to arcing and wear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power wireless NiMH charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ51013BRGER | Qi-compliant 5W receiver; supports 5V USB-PD input; no integrated NiMH CV regulation - requires external LDO and thermistor network. | Targets smartphones/accessories; lacks Zinc-Air detection and sub-2.2V operation - unsuitable for hearing aids or sealed wearables. | Select only if Qi ecosystem compatibility and higher power (>25mA) are required; adds BOM complexity for NiMH-specific safety. |
| MAX77734EWL+ | Multi-chemistry charger (Li-ion/NiMH); 2.5V–5.5V input; includes I²C interface and fuel gauge - larger 20-pin WLP package (2.1mm × 2.4mm). | Designed for system PMIC integration; requires firmware configuration; no native ACIN rectifier - needs external bridge diode. | Choose when multi-battery support or telemetry (voltage/current/temp reporting) is needed; not drop-in for space-critical hearing aid layouts. |
Compared with BQ51013BRGER and MAX77734EWL+, the LTC4123EDC#TRPBF offers the smallest solution size (2mm × 2mm), hardware-only safety features (Zinc-Air, reverse polarity, thermal pause), and true single-component NiMH optimization - making it uniquely suited for Class I medical wearables where reliability and miniaturization are non-negotiable.
Availability
LTC4123EDC#TRPBF is available at Aetrix Electronics and suitable for hearing aids, smart cards, fitness trackers, and rotating sensor systems requiring stable component supply, long-lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LTC4123EDC#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC4123 series.
The LTC4123 belongs to Linear's ultra-low-power wireless power receiver family, engineered specifically for medical-grade, space-constrained NiMH charging where connectorless operation and intrinsic safety are mandatory.
FAQ
What is the maximum charge current supported by the LTC4123EDC#TRPBF?
The LTC4123EDC#TRPBF supports a maximum constant-current charge of 25mA when configured with a 953Ω resistor on the PROG pin. This value is confirmed in the Electrical Characteristics table (ICHG = 22–28mA range at RPROG = 953Ω) and validated in the Typical Application circuit (4123 TA01) using that exact resistor value. The LTC4123EDC#TRPBF achieves this while maintaining ±15mV charge voltage accuracy and thermal fault protection.
Does the LTC4123EDC#TRPBF require an external AC-DC rectifier?
No, the LTC4123EDC#TRPBF integrates a built-in rectifier between ACIN and VCC pins. As specified in the Pin Functions section, an internal diode connects ACIN (anode) to VCC (cathode), enabling direct rectification of induced AC voltage from the receive coil. This eliminates the need for external Schottky diodes or bridge rectifiers - a key enabler of the minimal 2mm × 2mm solution size claimed in the datasheet for the LTC4123EDC#TRPBF.
How does the LTC4123EDC#TRPBF detect Zinc-Air batteries?
The LTC4123EDC#TRPBF detects Zinc-Air batteries during the first 80 seconds of the charge cycle by monitoring BAT pin voltage. If VBAT rises above 1.65V (typical) within that window, the IC halts charging and asserts fast blink on CHRG. This behavior is documented in the Electrical Characteristics table (VZn-AIR = 1.60–1.65V) and the Operation section, which confirms the 80s detection period (TZn-AIR) and 40mV hysteresis. The LTC4123EDC#TRPBF implements this entirely in hardware without firmware intervention.
What is the operating temperature range for the LTC4123EDC#TRPBF?
The LTC4123EDC#TRPBF is specified for operation from –20°C to 85°C junction temperature, as stated in the Order Information table and Absolute Maximum Ratings. Its thermal fault thresholds (–5°C cold, 70°C hot) and temperature-compensated charge voltage (–2.5mV/°C) are guaranteed across this full range. The datasheet notes that specifications over –20°C to 85°C are assured by design and correlation with statistical process controls - confirming the LTC4123EDC#TRPBF's suitability for body-worn and industrial ambient environments.
Can the LTC4123EDC#TRPBF be powered by a DC source instead of wireless AC?
Yes, the LTC4123EDC#TRPBF supports dual-mode power input: it can be powered either wirelessly via ACIN (induced AC from a transmit coil) or directly via DC applied to the VCC pin. The Applications Information section explicitly states "Operation without Wireless Power" and instructs users to ground ACIN when using DC VCC. This flexibility allows the same LTC4123EDC#TRPBF design to serve both wireless charging and conventional wired backup charging scenarios.
LTC4123EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Nickel Metal Hydride
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 25mA
- Battery Pack Voltage:
- 1.5075V
- Voltage - Supply (Max):
- 5V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC4123EDC#TRPBF FAQ
1.How can I place an order for LTC4123EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4123EDC#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 LTC4123EDC#TRPBF reliable?
The price and inventory of LTC4123EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4123EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4123EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4123EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4123EDC#TRPBF?
LTC4123EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4123EDC#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 LTC4123EDC#TRPBF?
For technical support, including LTC4123EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4123EDC#TRPBF requirements.
6.How does Aetrix verify that LTC4123EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4123EDC#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 LTC4123EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4123EDC#TRPBF?
All LTC4123EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4123EDC#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 LTC4123EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC4123EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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