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Analog Devices Inc. LTC4120IUD#TRPBF
- Part No.:
- LTC4120IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC4120IUD#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
LTC4120IUD#TRPBF from Analog Devices is a wireless power receiver and synchronous buck battery charger IC with Dynamic Harmonization Control (DHC), supporting 50–400mA programmable charge current, 3.5–11V adjustable float voltage, and operation across 12.5–40V input range. It enables contactless charging of Li-ion/polymer batteries in sealed or rotating industrial sensors and medical devices.
For engineers reviewing the LTC4120IUD#TRPBF datasheet, LTC4120IUD#TRPBF pinout, LTC4120IUD#TRPBF application, or LTC4120IUD#TRPBF equivalent, key selection factors include DHC-based input regulation, ±1% feedback voltage accuracy, NTC-qualified thermal management, auto-recharge at 2.2% battery voltage drop, and thermally enhanced 3mm × 3mm QFN package with exposed ground pad.
Technical Context
The LTC4120IUD#TRPBF integrates a synchronous buck regulator with DHC control loop that modulates resonant tank impedance to regulate input voltage (VIN(DHC) = 14V) without requiring microcontroller intervention. Its internal LDO generates INTVCC (4.15V UVLO) for gate drivers and low-battery linear charge current (ILOWBAT = 6–16mA).
It implements full battery management: preconditioning below 2.21V (VLOWBAT), trickle charge above VTRKL (1.68V), constant-current/constant-voltage charging, 2-hour safety timer, and end-of-charge detection via CHRG pin deassertion when IBAT falls to 10% of programmed value (hC/10 = 0.1 mA/mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | 50mA to 400mA, set by single resistor (RPROG = 24.3kΩ to 3.01kΩ), enabling precise current scaling for diverse battery capacities. |
| Float Voltage | Programmable 3.5V–11V (LTC4120 variant); LTC4120IUD#TRPBF supports full programmability, not fixed 4.2V. |
| Input Voltage Range | 12.5V to 40V - accommodates wide-range wireless receiver rectified outputs and ensures robust operation under coupling variation. |
| Feedback Accuracy | ±1% VFB(REG) = 2.370–2.418V - guarantees tight battery voltage regulation critical for Li-ion longevity and safety. |
| Switching Frequency | 750kHz (FREQ = GND) or 1.5MHz (FREQ = INTVCC) - selectable for EMI optimization and inductor size trade-offs. |
| Thermal Protection | NTC monitoring with cold/hot thresholds at 72–75% and 35.5–37.5% of INTVCC - enables safe charging across –40°C to 125°C junction range. |
| Quiescent Current | 60–100µA in sleep mode - minimizes standby drain during end-of-charge hold state. |
Pinout & Package
Package: 16-lead (3mm × 3mm × 0.75mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Must be soldered to PCB ground for θJA = 54°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INTVCC (1) | Internal LDO output | Supplies gate drivers and ILOWBAT; requires 2.2µF decoupling; no external load permitted beyond NTC bias network. |
| BOOST (2) | Bootstrap supply | Connects 22nF capacitor to SW to enable high-side MOSFET drive; critical for efficient buck operation. |
| IN (3) | Main power input | Accepts 12.5–40V rectified wireless receiver output; requires ≥10µF low-ESR ceramic decoupling. |
| SW (4) | Switch node | Drives external inductor (e.g., 33µH); connects to CHGSNS; handles peak currents up to 750mA (IPEAK). |
| GND (5, 17) | Power and thermal ground | Pin 5 and exposed pad (17) must both connect to low-impedance PCB ground plane for electrical integrity and thermal dissipation. |
| DHC (6) | Dynamic Harmonization Control | Modulates receiver tank resonance when VIN < 14V; requires Schottky diode + capacitor per typical application circuit. |
| FREQ (7) | Switching frequency select | Pull to GND → 750kHz; pull to INTVCC → 1.5MHz; floating prohibited. |
| CHGSNS (8) | Current sense input | Monitors battery charge current via internal 300mΩ sense resistor (RSNS); connects to SW via inductor. |
| BAT (9) | Battery output | Delivers regulated charge current; requires ≥22µF low-ESR ceramic capacitor; sources ILOWBAT during preconditioning. |
| FB (10) | Voltage feedback input | Sets float voltage via resistive divider (BAT→FB→FBG); 25nA bias current compensated by 588kΩ Thevenin resistance. |
| FBG (11) | Feedback ground return | Switches low-resistance path to GND during sensing; high-impedance in shutdown to isolate FB divider from battery. |
| NTC (12) | Temperature monitor input | Reads NTC thermistor (INTVCC→NTC→GND); triggers standby on out-of-range temperature; tie to GND to disable. |
| PROG (13) | Charge current programming | Regulates to 1.227V in CC mode; IBAT = 988 × VPROG/RPROG; keep parasitic capacitance minimal. |
| CHRG (14) | Charge status indicator | Open-drain output pulled low during charging; high-impedance at termination; sinks ≤5mA. |
| FAULT (15) | Fault status indicator | Open-drain output pulled low on NTC fault or bad battery detection; high-impedance otherwise. |
| RUN (16) | Enable/shutdown control | VEN = 2.45V (typ), VSD = 0.4–1.2V; resistor divider from IN sets enable threshold; hysteresis = 200mV. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Harmonization Control (DHC) | Automatically adjusts resonant frequency to maintain stable input regulation across air-gap coupling variations (e.g., 9–11mm spacing), eliminating need for transmitter feedback loops. |
| Programmable Float Voltage | Supports multi-chemistry batteries (Li-ion, LiFePO₄, NiMH) via external resistor divider; 3.5–11V range avoids overvoltage damage in field-deployed systems. |
| Integrated Safety Timer & Auto-Recharge | 2.0-hour (typ) safety timeout prevents overcharge; automatic restart when VBAT drops 2.2% below float voltage extends battery runtime in intermittent-use applications. |
| NTC Temperature Qualified Charging | Monitors battery temperature via precision ratiometric NTC interface; halts charging outside safe range (e.g., <0°C or >45°C) without external ADC or firmware. |
| Low-Power Sleep Mode | 60–100µA quiescent current after charge termination reduces system standby power - critical for battery-powered remote sensors. |
Applications
| Industrial Wireless Sensors | Sealed Medical Devices |
|---|---|
|
Use Scenario: Battery-powered pressure/temperature sensors mounted inside rotating machinery or explosion-proof enclosures where physical connectors are unreliable or prohibited. IC Role / Device Role / Timing Role: Wireless power receiver and battery charger managing energy harvesting from magnetic fields; regulates input voltage via DHC to sustain charging despite variable coil alignment. Use Value: Enables maintenance-free operation for >5 years by eliminating connector wear, corrosion, and ingress points - validated at 14mm air gap with >60% transfer efficiency. |
Use Scenario: Implantable or wearable diagnostic devices requiring hermetic sealing for biocompatibility and sterilization (e.g., surgical tools, glucose monitors). IC Role / Device Role / Timing Role: Primary battery management IC providing NTC-qualified charging, low-leakage sleep mode, and precise 4.2V float regulation for medical-grade Li-ion cells. Use Value: Ensures compliance with IEC 62304 safety standards through hardware-enforced thermal cutoff, 2-hour timer termination, and <100nA shutdown current. |
| Harsh-Environment Instrumentation | Rotating Equipment Monitoring |
|
Use Scenario: Handheld test equipment used in oil refineries, chemical plants, or outdoor infrastructure where moisture, dust, and vibration preclude conventional charging ports. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with ±1% VFB accuracy and wide 12.5–40V input range tolerating rectified AC ripple from unregulated wireless receivers. Use Value: Delivers reliable 400mA charging even under 30% input voltage sag, reducing recharge time by 35% vs. linear chargers in field-deployed instruments. |
Use Scenario: Vibration sensors embedded in motor shafts or turbine blades where wired connections fail due to continuous rotation. IC Role / Device Role / Timing Role: Synchronous buck regulator with DHC dynamically tuning receiver resonance to compensate for changing coil coupling during rotation. Use Value: Maintains stable 4.2V battery float voltage within ±25mV across 0–3000 RPM, preventing undercharge or overcharge in dynamic mechanical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP-A21 (MPS) | Fixed 4.2V output only; no programmable float voltage; lacks DHC - relies on external MCU for input regulation. | Suitable for cost-sensitive consumer wearables but not for multi-chemistry or wide-coupling industrial use. | Select LTC4120IUD#TRPBF when programmable chemistry support and autonomous DHC regulation are required. |
| BQ51221 (TI) | Integrated Qi-compliant receiver; includes digital control, but no NTC interface or safety timer; 500mA max charge current. | Designed for smartphone accessories; lacks industrial temp range (–40°C to 125°C) and harsh-environment fault reporting. | Choose LTC4120IUD#TRPBF for extended temperature operation, analog safety features, and non-Qi proprietary wireless systems. |
Compared with MP-A21 and BQ51221, the LTC4120IUD#TRPBF uniquely combines programmable float voltage, autonomous DHC regulation, integrated NTC qualification, and industrial temperature rating - making it the only option for sealed, rotating, or chemically diverse battery systems requiring zero microcontroller dependency.
Availability
LTC4120IUD#TRPBF is available at Aetrix Electronics and suitable for industrial wireless sensors, sealed medical devices, and harsh-environment instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC4120IUD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC4120 product line delivers autonomous wireless battery charging solutions for applications where connectors fail - emphasizing reliability, safety, and analog intelligence over digital complexity.
FAQ
What is the operating temperature range for the LTC4120IUD#TRPBF?
The LTC4120IUD#TRPBF is rated for –40°C to 125°C junction temperature. This industrial-grade specification ensures reliable operation in sealed enclosures, rotating machinery, and outdoor instrumentation where ambient temperatures exceed commercial limits. The device's thermal design leverages the exposed pad (Pin 17) for effective heat dissipation, achieving θJA = 54°C/W when properly soldered to PCB ground.
Does the LTC4120IUD#TRPBF support fixed 4.2V charging like the LTC4120-4.2 variant?
No - the LTC4120IUD#TRPBF is the standard LTC4120 variant with fully programmable float voltage (3.5V to 11V) via external resistor divider on FB/FBG pins. The LTC4120-4.2 part number denotes the fixed 4.2V version; LTC4120IUD#TRPBF does not have BATSNS pin or factory-trimmed 4.2V reference. Its VFB(REG) = 2.370–2.418V enables precise multi-chemistry configuration.
How does Dynamic Harmonization Control (DHC) improve wireless charging efficiency in the LTC4120IUD#TRPBF?
DHC in the LTC4120IUD#TRPBF regulates input voltage by modulating the resonant frequency of the receiver tank via the DHC pin, automatically adjusting power transfer without transmitter-side feedback. This maintains >60% efficiency across 9–11mm air gaps and compensates for misalignment in rotating or vibrating systems - eliminating the need for complex closed-loop communication between transmitter and receiver.
Can the LTC4120IUD#TRPBF be used without an NTC thermistor?
Yes - the NTC function is optional. To disable thermal qualification, tie the NTC pin (Pin 12) directly to GND. The LTC4120IUD#TRPBF will then operate in standard CC/CV mode without temperature monitoring. However, for medical or industrial applications requiring IEC 62304 or UL 1642 compliance, retaining the NTC network is strongly recommended for battery safety.
What is the minimum external component count required for basic operation of the LTC4120IUD#TRPBF?
A functional LTC4120IUD#TRPBF circuit requires: 1× 10µF CIN (IN-to-GND), 1× 22µF CBAT (BAT-to-GND), 1× 22nF CBST (BOOST-to-SW), 1× 2.2µF CINTVCC (INTVCC-to-GND), 1× 33µH inductor (SW-to-CHGSNS), 1× RPROG (e.g., 3.01kΩ for 400mA), and 1× RUN resistor divider. No microcontroller, external MOSFETs, or precision op-amps are needed - all regulation and protection are integrated.
LTC4120IUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 400mA
- Battery Pack Voltage:
- 11V
- Voltage - Supply (Max):
- 40V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC4120IUD#TRPBF FAQ
1.How can I place an order for LTC4120IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4120IUD#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 LTC4120IUD#TRPBF reliable?
The price and inventory of LTC4120IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4120IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4120IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4120IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4120IUD#TRPBF?
LTC4120IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4120IUD#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 LTC4120IUD#TRPBF?
For technical support, including LTC4120IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4120IUD#TRPBF requirements.
6.How does Aetrix verify that LTC4120IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4120IUD#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 LTC4120IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4120IUD#TRPBF?
All LTC4120IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4120IUD#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 LTC4120IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4120IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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