My Inquiry
My Account
Analog Devices Inc. LTC4120IUD#PBF
- Part No.:
- LTC4120IUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC4120IUD#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC4120IUD#PBF from Analog Devices is a wireless power receiver and synchronous buck battery charger IC supporting 50mA–400mA programmable charge current, ±1% feedback voltage accuracy, and Dynamic Harmonization Control (DHC) for efficient air-gap power transfer. It operates across 12.5V–40V input range, delivers up to 400mA constant-current/constant-voltage charging, and integrates NTC temperature qualification, safety timer termination, and auto-recharge - used in sealed industrial sensors and portable medical devices.
For engineers reviewing the LTC4120IUD#PBF datasheet, LTC4120IUD#PBF pinout, LTC4120IUD#PBF application, or LTC4120IUD#PBF equivalent, key selection considerations include its 16-lead 3mm × 3mm QFN package, DHC-based input regulation at 14V, ±1% VFB(REG) accuracy, and compatibility with Li-ion/Polymer batteries via programmable float voltage (3.5V–11V).
Technical Context
The LTC4120IUD#PBF implements a synchronous buck topology with integrated high-side and low-side MOSFETs (RDS(ON) = 0.8Ω / 0.5Ω), selectable switching frequency (750kHz or 1.5MHz via FREQ pin), and precise current sensing through CHGSNS–BAT internal 300mΩ sense resistor. Its DHC architecture dynamically modulates resonant tank impedance by controlling the DHC pin's impedance state based on VIN vs. 14V threshold, enabling adaptive power regulation without microcontroller intervention.
It features dual-mode battery preconditioning: linear low-battery charge (6–16mA) below 2.21V, followed by switch-mode trickle charge (ICHG/10) above 2.21V but below 1.68V FB threshold. End-of-charge detection uses hC/10 ratio (0.1× full current) and 1.3–2.8-hour safety timer, while FAULT and CHRG open-drain pins provide real-time status signaling with 5mA sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12.5V to 40V - supports wide-range wireless Rx rectified output; enables operation across varying coupling distances and transmitter coil tolerances. |
| Charge Current Range | 50mA to 400mA - programmed via single 1% resistor on PROG pin; enables scalable battery capacity support from small coin cells to multi-cell packs. |
| Float Voltage Range | 3.5V to 11V - programmable via FB/FBG resistive divider; accommodates Li-ion, LiFePO₄, and custom chemistries without hardware change. |
| Feedback Accuracy | ±1% at VFB(REG) = 2.393V–2.418V - ensures tight voltage regulation critical for battery longevity and safety compliance. |
| DHC Input Regulation | VIN(DHC) = 14V - sets dynamic input voltage clamp point; allows automatic adjustment of received power by modulating receiver tank resonance. |
| Switching Frequency | 750kHz (FREQ = GND) or 1.5MHz (FREQ = INTVCC) - balances efficiency vs. EMI and inductor size; supports compact layout with 33µH–68µH inductors. |
| Thermal Shutdown | Junction temp limit = 125°C; θJA = 54°C/W - requires exposed pad soldered to PCB ground plane for reliable thermal dissipation in sealed enclosures. |
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 thermal and electrical 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 except NTC bias network. |
| BOOST (2) | Bootstrap supply | Connects 22nF capacitor to SW; enables high-side MOSFET drive during buck switching cycle. |
| IN (3) | Main input power | Accepts rectified wireless Rx voltage; requires ≥10µF low-ESR ceramic decoupling to GND. |
| SW (4) | Switch node | Drives external inductor (SW→CHGSNS); carries pulsed current up to 750mA peak; must minimize trace inductance. |
| GND (5, 17) | Power and thermal ground | Pins 5 and 17 (exposed pad) must connect to solid PCB ground plane for thermal management and noise control. |
| DHC (6) | Dynamic Harmonization Control | Modulates receiver tank impedance when VIN < 14V; connects Schottky diode + capacitor per typical application. |
| FREQ (7) | Frequency select | Logic-level input: GND = 750kHz, INTVCC = 1.5MHz; determines trade-off between efficiency and EMI filtering complexity. |
| CHGSNS (8) | Current sense input | Monitors battery current via internal 300mΩ resistor; connects to SW-side of inductor; sensitive to PCB layout parasitics. |
| BAT (9) | Battery output | Delivers regulated charge current; requires ≥22µF low-ESR ceramic capacitor directly at pin for stability. |
| FB (10) | Voltage feedback | Sets float voltage via resistive divider (BAT→FB→FBG); 25nA bias current requires ≤588kΩ Thevenin resistance. |
| FBG (11) | Feedback ground | Switches low-resistance path to GND during active charging; high-impedance in shutdown to reduce battery leakage. |
| NTC (12) | Temperature monitor | Interfaces with NTC thermistor (INTVCC→NTC→GND); triggers standby on over/under-temp; tie to GND to disable. |
| PROG (13) | Charge current programming | 1.227V servo voltage; sets ICHG = 988 × VPROG/RPROG; use 1% resistor (e.g., 3.01kΩ = 400mA). |
| CHRG (14) | Charge status indicator | Open-drain output: low during charge, high-Z at end-of-charge or timeout; pull-up to IN or system rail. |
| FAULT (15) | Fault status indicator | Open-drain output: low on NTC fault or bad battery detection; high-Z otherwise; pull-up required. |
| RUN (16) | Enable/disable control | 2.45V enable threshold with 200mV hysteresis; use resistive divider from IN to set VIN turn-on point. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Harmonization Control (DHC) | Enables contactless power regulation across variable coupling gaps (e.g., 9–11mm) without transmitter redesign or feedback loop latency. |
| Programmable float voltage (3.5V–11V) | Supports diverse battery chemistries (Li-ion, LiFePO₄, NiMH) using only two external resistors - no firmware or BOM change required. |
| Integrated NTC temperature qualification | Monitors battery temperature via external thermistor; pauses charging outside safe range (e.g., <0°C or >45°C) and resumes automatically upon recovery. |
| Auto-recharge with 2.2% hysteresis | Restarts charging when battery voltage drops 2.2% below float voltage - prevents deep discharge in intermittently powered sealed systems. |
| Low-quiescent sleep mode (60–100µA) | Extends battery life in always-connected devices by minimizing idle current after charge completion. |
| Bad battery fault detection | Identifies shorted, open, or severely degraded cells within 19–42 minutes and asserts FAULT pin - avoids unsafe charging conditions. |
Applications
| Industrial Wireless Sensors | Sealed Medical Devices |
|---|---|
|
Use Scenario: Battery-powered pressure/temperature sensors mounted inside stainless-steel enclosures in food processing lines, requiring IP69K-rated hermetic sealing and no physical connectors. IC Role / Device Role / Timing Role: Wireless power receiver and Li-ion charger managing 400mA CC/CV charge cycles with NTC-qualified thermal safety. Use Value: Eliminates connector failure points and enables continuous operation in washdown environments without maintenance downtime. |
Use Scenario: Portable ultrasound probe with embedded rechargeable battery, charged wirelessly inside a disinfectant-resistant housing between patient uses. IC Role / Device Role / Timing Role: Synchronous buck charger regulating 4.2V float voltage with 2-hour safety timer and auto-recharge. Use Value: Maintains clinical readiness by enabling rapid top-up charging without exposing electronics to harsh cleaning agents. |
| Rotating Equipment Monitoring | Harsh-Environment IoT Nodes |
|
Use Scenario: Vibration sensor on rotating turbine shaft, powered via inductive coupling across air gap where slip rings would wear or fail. IC Role / Device Role / Timing Role: DHC-controlled wireless receiver maintaining stable 14V input regulation despite dynamic coil misalignment. Use Value: Enables reliable long-term monitoring without mechanical wear, lubrication, or scheduled replacement of contact interfaces. |
Use Scenario: Remote environmental monitor deployed in desert oil fields, operating in -40°C to 125°C ambient with dust/sand ingress protection. IC Role / Device Role / Timing Role: Wide-temperature (-40°C to 125°C) wireless charger with low-battery preconditioning and cold-temperature NTC disable. Use Value: Ensures first-power reliability in extreme cold and sustained operation under thermal cycling stress. |
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 float only; no programmable VFLOAT; lacks DHC; uses external MOSFETs instead of integrated buck switches. | Requires additional gate drivers and sense resistors; limited to single-chemistry designs; lower integration increases BOM count. | Select MP-A21 only if fixed 4.2V Li-ion charging suffices and external power stage flexibility is preferred over DHC-based coupling tolerance. |
| BQ51013B (TI) | Integrated Qi-compliant receiver; includes digital control, packet communication, and foreign object detection; no programmable charge current via resistor. | Designed for consumer-grade Qi ecosystems; requires MCU host for configuration; not suited for isolated industrial environments without communication infrastructure. | Choose BQ51013B only for certified Qi applications with host MCU support; avoid for standalone, connectorless industrial charging where DHC simplicity is critical. |
Compared with MP-A21 and BQ51013B, the LTC4120IUD#PBF offers unique DHC-based adaptive power regulation, resistor-programmable chemistry support, and fully autonomous operation - making it optimal for ruggedized, maintenance-free wireless charging where coupling variability and environmental sealing are primary constraints.
Availability
LTC4120IUD#PBF is available at Aetrix Electronics and suitable for industrial wireless sensors, sealed medical devices, and rotating equipment monitoring requiring stable component supply, extended temperature operation (-40°C to 125°C), and lead-free RoHS-compliant packaging.
Supply support for LTC4120IUD#PBF 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 precision instrumentation, industrial automation, and medical markets since 1965.
The LTC4120 belongs to Analog Devices' wireless power management product line, designed specifically for robust, microcontroller-free contactless battery charging in harsh, sealed, or mechanically constrained environments.
FAQ
What is the function of the DHC pin on the LTC4120IUD#PBF?
The DHC pin on the LTC4120IUD#PBF enables Dynamic Harmonization Control by modulating the resonant receiver tank impedance when input voltage falls below 14V. It connects to a Schottky diode and capacitor network that adjusts the effective resonant frequency, allowing the LTC4120IUD#PBF to regulate received power autonomously across varying coupling distances without transmitter-side changes.
Can the LTC4120IUD#PBF charge batteries other than Li-ion?
Yes, the LTC4120IUD#PBF supports multiple chemistries via its programmable float voltage (3.5V–11V) set by an external resistive divider on FB/FBG pins. It has been validated for Li-ion, LiFePO₄, and custom battery configurations - unlike the fixed 4.2V LTC4120-4.2 variant. The LTC4120IUD#PBF's ±1% feedback accuracy ensures safe voltage regulation across all supported ranges.
How does the LTC4120IUD#PBF handle low-battery preconditioning?
The LTC4120IUD#PBF performs two-stage low-battery recovery: first, a linear 6–16mA charge current (ILOWBAT) when battery voltage is below 2.21V; second, a switch-mode trickle charge at ICHG/10 once voltage rises above 2.21V but remains below the 1.68V FB threshold. This prevents lithium plating and ensures safe cell recovery before full-rate charging begins.
What is the purpose of the FBG pin on the LTC4120IUD#PBF?
The FBG pin on the LTC4120IUD#PBF serves as a switched ground return for the FB resistive divider. During active charging, it presents low resistance (~1000–2000Ω) to GND, completing the feedback path. In shutdown or disabled modes, it becomes high-impedance, reducing total battery leakage current by disconnecting the divider - a critical feature for long-term storage in sealed systems.
Does the LTC4120IUD#PBF require a microcontroller to operate?
No, the LTC4120IUD#PBF operates autonomously without any microcontroller. All functions - including DHC regulation, charge current programming (via PROG resistor), float voltage setting (via FB divider), NTC monitoring, safety timer, auto-recharge, and FAULT/CHRG signaling - are implemented in analog hardware. This makes the LTC4120IUD#PBF ideal for ultra-reliable, low-BOM-count wireless charging systems.
LTC4120IUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC4120IUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4120IUD#PBF 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#PBF reliable?
The price and inventory of LTC4120IUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4120IUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4120IUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4120IUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4120IUD#PBF?
LTC4120IUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4120IUD#PBF 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#PBF?
For technical support, including LTC4120IUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4120IUD#PBF requirements.
6.How does Aetrix verify that LTC4120IUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4120IUD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC4120IUD#PBF?
All LTC4120IUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4120IUD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC4120IUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4120IUD#PBF Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
