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Analog Devices Inc. LTC4123EDC#TRMPBF
- Part No.:
- LTC4123EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4123EDC#TRMPBF.pdf
- Description:
- IC BATT CHG NIMH 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
LTC4123EDC#TRMPBF 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#TRMPBF datasheet, LTC4123EDC#TRMPBF pinout, LTC4123EDC#TRMPBF application, or LTC4123EDC#TRMPBF equivalent, key selection criteria include its 2mm × 2mm DFN-6 package, 6-hour programmable charge timer, ±15mV battery voltage accuracy over –5°C to 70°C, and compatibility with resonant 244kHz wireless power transfer systems using external LC tanks.
Technical Context
The LTC4123EDC#TRMPBF integrates a synchronous rectifier and linear charging controller optimized for single-cell NiMH batteries in space-constrained wireless applications. Its ACIN pin accepts resonant AC input (e.g., from a 13µH receive coil), rectifies it internally, and regulates VCC to ≤5V while limiting peak voltage to 5V and minimum to 3V.
Charge control uses dual-stage CC/CV algorithm with PROG-pin-based current programming (ICHG = 24V/RPROG), temperature-compensated BAT voltage (–2.5mV/°C), and hardware-enforced safety: UVLO (1.95V threshold), UVCL (2.2V activation), die thermal monitoring (–5°C to 70°C fault range), and 80-second Zinc-Air detection window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 1.5075V at 25°C, ±15mV over –5°C to 70°C - ensures precise NiMH state-of-charge without overvoltage stress |
| Max Charge Current | 25mA (with 953Ω RPROG) - supports full charge of typical hearing aid batteries in ~6 hours |
| Input Voltage Range | 2.2V to 5V on VCC; ACIN accepts resonant AC up to VCC+1V - enables operation from weak wireless coupling or DC backup supply |
| Quiescent Current | 125–200µA (charging terminated) - minimizes standby drain in always-on wearable devices |
| Battery Leakage | ≤100nA at VBAT = 2V - preserves charge during long idle periods in sealed hearing aids |
| Charge Timer | 4.8–7.2 hours - provides time-based termination independent of voltage/current thresholds |
| Thermal Fault Range | Cold fault at –5°C (±5°C hysteresis); hot fault at 70°C (±5°C hysteresis) - pauses charging to protect battery and IC |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 80.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ACIN (Pin 1) | AC input node for resonant tank | Connects to receive coil + capacitor; internal diode rectifies AC to VCC; short to GND if unused |
| VCC (Pin 2) | DC power rail output | Regulated rectified output (≤5V); requires 4.7µF bypass capacitor; powers internal circuitry and battery charging path |
| CHRG (Pin 3) | Open-drain status indicator | 340µA pull-down current source; blinks slow (0.8Hz) during charge, fast (6Hz) on faults, pulls low at completion |
| PROG (Pin 4) | Current programming reference | 0.25V servo point; ICHG = 96 × VPROG / RPROG = 24V / RPROG - sets charge current via external resistor |
| BAT (Pin 5) | NiMH battery connection | Regulated 1.5V output with –2.5mV/°C tempco; high-impedance when fault detected or charge complete |
| 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 electrical stability |
Key Features
| Feature | Design Value |
|---|---|
| Zinc-Air battery detection | Identifies non-rechargeable batteries within 80 seconds by monitoring BAT voltage rise >1.65V - prevents hazardous charging |
| Reverse polarity protection | Halts charging if BAT < –50mV - avoids damage from incorrectly inserted NiMH cells |
| Integrated rectifier with overvoltage limit | Clamps VCC to 5V max and 3V min - eliminates need for external TVS or LDO in wireless receiver stage |
| Temperature-compensated charge voltage | Adjusts BAT setpoint –2.5mV/°C - maintains optimal NiMH charge profile across operating ambient (–20°C to 85°C) |
| Low minimum input voltage | Operates down to 2.2V on VCC - sustains charging under marginal wireless coupling or low-battery transmitter conditions |
Applications
| Hearing Aids | Smart Cards |
|---|---|
Use Scenario: Sealed, miniaturized hearing aids requiring maintenance-free charging through plastic housing without physical connectors. IC Role / Device Role / Timing Role: Wireless receiver and linear NiMH charger - converts magnetic field energy into regulated 1.5V/25mA charge current with thermal and chemistry safeguards. Use Value: Enables IP67-rated, tamper-proof enclosure design while delivering full charge in ≤6 hours with ±15mV voltage accuracy. | Use Scenario: Contactless smart cards with embedded rechargeable NiMH battery for extended active RFID functionality. IC Role / Device Role / Timing Role: Low-quiescent (125µA) wireless charging front-end - powers card electronics during proximity to reader field and recharges battery between sessions. Use Value: Eliminates battery replacement logistics; supports >1000 charge cycles with Zinc-Air detection preventing accidental charging of primary cells. |
| Fitness Trackers | Moving Equipment Sensors |
Use Scenario: Wearable fitness bands with rotating bezels or waterproof housings where traditional charging ports compromise ergonomics or sealing. IC Role / Device Role / Timing Role: Compact (2mm × 2mm) wireless charging manager - handles intermittent coil coupling during motion and maintains safe charge termination. Use Value: Reduces solution footprint by >40% vs discrete rectifier + charger; thermal fault pause prevents overheating during dynamic use. | Use Scenario: Rotating industrial sensors (e.g., motor shaft monitors) that cannot accommodate wired charging due to continuous rotation. IC Role / Device Role / Timing Role: Self-contained wireless power receiver - charges NiMH battery during brief dwell periods near fixed transmitter coils. Use Value: Enables maintenance-free operation for >2 years; UVCL (2.2V threshold) ensures stable charging even with variable coupling efficiency. |
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 Li-ion only; no NiMH voltage regulation or Zinc-Air detection | Designed for smartphones/tablets; lacks hearing aid–grade low-power modes and battery chemistry safeguards | Choose only if migrating to Li-ion and requiring Qi certification - not suitable for NiMH or sealed medical devices |
| MAX17710G+ | Energy harvesting PMIC with 100mA Li-ion charger; no integrated rectifier or NiMH-specific algorithms | Targets ultra-low-power IoT sensors; requires external AC-DC conversion and battery management firmware | Select when combining RF/thermal/solar harvesting with Li-ion; does not replace LTC4123EDC#TRMPBF's all-in-one NiMH wireless function |
Compared with BQ51013BRGER and MAX17710G+, the LTC4123EDC#TRMPBF uniquely integrates resonant AC rectification, NiMH-specific CC/CV control, Zinc-Air detection, and 2mm × 2mm DFN packaging - making it the only drop-in solution for certified hearing aid wireless charging without redesigning safety-critical battery management logic.
Availability
LTC4123EDC#TRMPBF is available at Aetrix Electronics and suitable for hearing aids, smart cards, fitness trackers, and rotating equipment sensors requiring stable component supply and long-term lifecycle support.
Supply support for LTC4123EDC#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 acquired Linear Technology in 2017 and maintains its precision analog IC portfolio, including high-reliability power management solutions for medical, industrial, and portable applications.
The LTC4123EDC#TRMPBF belongs to Linear's wireless power receiver product line, engineered specifically for ultra-low-power, safety-critical NiMH charging in hermetically sealed, size-constrained devices like hearing aids and implantable peripherals.
FAQ
What is the maximum charge current supported by the LTC4123EDC#TRMPBF?
The LTC4123EDC#TRMPBF supports a maximum charge current 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, TYP = 25mA). The device uses ICHG = 24V / RPROG, so lower resistance yields higher current - but 953Ω is the standard 1% value selected to achieve nominal 25mA within tolerance.
Does the LTC4123EDC#TRMPBF require an external rectifier diode?
No, the LTC4123EDC#TRMPBF does not require an external rectifier diode. It integrates a built-in rectifier between ACIN and VCC, as confirmed in the Pin Functions section ("An internal diode is connected from the ACIN pin (anode) to this pin [VCC] (cathode)") and Block Diagram (Rectification and Input Power Control block). This eliminates external components and reduces solution size - critical for hearing aid applications.
How does the LTC4123EDC#TRMPBF detect Zinc-Air batteries?
The LTC4123EDC#TRMPBF detects Zinc-Air batteries by monitoring the BAT pin voltage during the first 80 seconds of charging. If BAT rises above 1.65V (typical) within that window, the device halts charging and signals a fault via fast-blinking CHRG. This behavior is documented in the Electrical Characteristics table (VZn-AIR = 1.60–1.65V) and Operation section, ensuring safe rejection of non-rechargeable chemistries.
What is the operating temperature range for the LTC4123EDC#TRMPBF?
The LTC4123EDC#TRMPBF is specified for an operating junction temperature range of –20°C to 85°C, with guaranteed performance over –20°C to 85°C per the Order Information table. Thermal fault protection activates at –5°C (cold) and 70°C (hot), pausing charging to protect battery and IC - a feature validated in the Electrical Characteristics section (Cold/Hot Temperature Fault Thresholds).
Can the LTC4123EDC#TRMPBF be used with lithium-ion batteries?
No, the LTC4123EDC#TRMPBF is not designed for lithium-ion batteries. Its charge voltage is fixed at ~1.5V with NiMH-specific temperature compensation (–2.5mV/°C), and its safety features - including Zinc-Air detection and reverse polarity protection - target NiMH chemistry. The datasheet explicitly states it is "a constant-current/constant-voltage linear charger for NiMH batteries" and provides no Li-ion voltage profiles or termination methods.
LTC4123EDC#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC4123EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4123EDC#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 LTC4123EDC#TRMPBF reliable?
The price and inventory of LTC4123EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4123EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4123EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4123EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4123EDC#TRMPBF?
LTC4123EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4123EDC#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 LTC4123EDC#TRMPBF?
For technical support, including LTC4123EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4123EDC#TRMPBF requirements.
6.How does Aetrix verify that LTC4123EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4123EDC#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 LTC4123EDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4123EDC#TRMPBF?
All LTC4123EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4123EDC#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 LTC4123EDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4123EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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