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Analog Devices Inc. LTC4012IUF-2#TRPBF
- Part No.:
- LTC4012IUF-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012IUF-2#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,953
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Product details
Overview
LTC4012IUF-2#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller for Li-ion/polymer packs with PowerPath™ input management. It delivers ±0.5% float voltage accuracy, programmable 4% charge current (up to 3A), and 550kHz quasi-constant-frequency PWM-enabling silent operation with ceramic capacitors. It supports 1–4-cell configurations at 4.2V/cell and operates across –40°C to 125°C for industrial portable power systems.
For engineers reviewing the LTC4012IUF-2#TRPBF datasheet, LTC4012IUF-2#TRPBF pinout, LTC4012IUF-2#TRPBF application, or LTC4012IUF-2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed multi-chemistry charging architecture, and real-world PowerPath control behavior-not generic charger IC summaries.
Technical Context
The LTC4012IUF-2#TRPBF implements a current-mode synchronous buck topology with external MOSFET drivers (TGATE/BGATE), enabling high-efficiency charging up to 95% at 2A. Its ITH node provides cycle-by-cycle peak-current control, while PROG delivers linearized analog current monitoring with ±4% accuracy.
PowerPath control uses INFET to drive an external PMOS between DCIN and CLP, maintaining ~25mV forward drop and blocking reverse current within 6µs when DCIN falls below CLP by >25mV. Pin-programmed FVS0/FVS1 inputs select fixed 4.2V/cell output for 1–4-series Li-ion packs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.2V per cell (pin-programmed via FVS0/FVS1); supports 1–4-cell Li-ion packs without external divider |
| Charge Current Accuracy | ±4% over temperature; set by RPROG, RIN, and RSENSE; monitored linearly at PROG pin |
| Switching Frequency | 550kHz typical; quasi-constant frequency avoids audible noise with ceramic bulk capacitors |
| Input Voltage Range | 6V to 28V on CLP; supports wide-range AC adapters and industrial DC supplies |
| Operating Temperature | –40°C to 125°C (I-grade); qualified for extended thermal environments in portable instruments |
| Package | 20-pin 4mm × 4mm QFN with exposed GND pad; θJA = 37°C/W for thermal reliability |
| Float Voltage Accuracy | ±0.5% (LTC4012 variant); ±0.8% (I-grade LTC4012-2); ensures precise cell voltage regulation |
Pinout & Package
20-pin (4mm × 4mm × 0.75mm) plastic QFN package with exposed GND pad (Pin 21), soldered directly to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative | Senses adapter input current via external resistor; threshold = CLP – 100mV; requires noise filtering |
| CLP (2) | Adapter input supply & current limit reference | Primary input power rail (6–28V); powers internal circuits and sets current limit baseline |
| INFET (3) | PMOS gate driver for PowerPath | Drives external PFET to maintain ~25mV forward drop; clamped 6V below CLP; blocks reverse current in <6µs |
| DCIN (4) | DC input voltage sense | Compares against CLP to enable PowerPath and ACP indication; range: GND to 28.2V |
| ACP (5) | Active-low AC present indicator | Open-drain output pulls low when DCIN > BAT + 500mV; signals host MCU of valid adapter presence |
| SHDN (6) | Active-low shutdown control | Pulled down internally (40kΩ); drives <300mV to force shutdown; draws <60µA in shutdown |
| CHRG (7) | Active-low charge status indicator | Three-state open-drain: strong pull-down (charging), 25µA weak pull-down (C/10), high-Z (no charge) |
| ICL (8) | Active-low input current limit indicator | Pulls low when charge current reduced due to adapter current limiting; enables dynamic power budgeting |
| FVS0 (9) | Battery voltage select LSB | Digital input (GND/INTVDD) selecting 1–4-cell 4.2V/cell output; used only on LTC4012-2 variants |
| FVS1 (10) | Battery voltage select MSB | Digital input (GND/INTVDD) completing 2-bit selection of preset Li-ion pack voltage |
| BAT (11) | Battery pack connection | Direct connection to battery terminal; voltage sensed for CV mode and safety monitoring |
| ITH (12) | PWM current control & compensation node | Voltage-controlled peak-current threshold; external RC network sets loop stability and soft-start timing |
| PROG (13) | Charge current programming & monitoring | Resistor-to-GND sets max current; voltage proportional to actual ICHRG (11.67µA/mV scale) |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; operating range: (BAT – 50mV) to (BAT + 200mV) |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; matched with CSN for accurate differential sensing |
| BGATE (16) | Synchronous rectifier NMOS driver | Drives bottom FET in buck converter; improves efficiency vs. diode rectification; GND to INTVDD swing |
| INTVDD (17) | Internal 5V regulator output | Supplies gate drivers; shuts down in SHDN; max load 20mA; bypass with ≥1µF ceramic capacitor |
| SW (18) | Buck switch node | High dv/dt node; connects to inductor and TGATE bootstrap circuit; requires tight layout and ground plane |
| TGATE (19) | Top-side NMOS driver output | Drives high-side buck FET; bootstrapped from BOOST; swing: GND to (CLN + 5V) |
| BOOST (20) | Bootstrap capacitor return | Connects to SW and INTVDD via external capacitor; enables high-side gate drive above CLN rail |
| GND (21) | Exposed thermal pad / system ground | Must be soldered to PCB ground plane; serves as reference for all internal circuits and thermal path |
Key Features
| Feature | Design Value |
|---|---|
| No audible noise operation | Quasi-constant 550kHz PWM eliminates ceramic capacitor squeal-critical for medical and audio equipment |
| PowerPath™ ideal diode control | INFET actively regulates ~25mV forward drop and blocks reverse current in <6µs, eliminating discrete diode loss |
| Pin-programmed Li-ion voltage | FVS0/FVS1 digital inputs select 4.2V/cell for 1–4-cell packs-no external resistor divider required |
| Analog charge current monitor | PROG pin outputs linear voltage (11.67µA/mV scale) proportional to real-time ICHRG, simplifying MCU-based current logging |
| AC adapter current limiting | CLP/CLN differential sensing enables precise input current cap (e.g., 2A USB-C PD), preventing source overload |
| Micropower shutdown | <60µA battery drain in shutdown; extends standby time in battery-backed instrumentation |
Applications
| Portable Medical Instruments | Notebook Computers |
|---|---|
|
Use Scenario: Handheld ultrasound or glucose meters requiring reliable, silent charging in field-deployed units. IC Role / Device Role / Timing Role: Synchronous buck charger controller managing 2-cell 8.4V Li-ion pack with PowerPath prioritizing system load over charging. Use Value: 550kHz PWM prevents ceramic capacitor noise interference with sensitive analog front-ends; ±0.5% voltage accuracy maintains cell health over 500+ cycles. |
Use Scenario: Ultrabook platforms needing dual-path power (adapter + battery) with seamless switchover and thermal headroom. IC Role / Device Role / Timing Role: Primary battery charger IC controlling 3-cell 12.6V Li-ion pack while coordinating with system PMIC via CHRG/ICL status pins. Use Value: INFET-driven PowerPath reduces input path loss by >300mW vs. Schottky diode; ICL output enables dynamic adapter current allocation during CPU boost. |
| Battery Backup Systems | Industrial Portable Test Equipment |
|
Use Scenario: Rack-mounted UPS modules with hot-swappable Li-ion battery trays and strict input power capping. IC Role / Device Role / Timing Role: Charger controller enforcing 2.5A adapter current limit (via CLP/CLN) while delivering full 3A charge when input allows. Use Value: Programmable input current limit prevents breaker tripping in shared AC circuits; C/10 detection enables precise end-of-charge signaling to backup controller. |
Use Scenario: Handheld oscilloscopes or multimeters operating in harsh environments (-40°C to 85°C ambient). IC Role / Device Role / Timing Role: Robust battery management IC handling 4-cell 16.8V Li-ion packs with guaranteed operation across full industrial temperature range. Use Value: I-grade qualification (–40°C to 125°C) ensures stable 4.2V/cell regulation and <1% charge current drift at temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4012IUF-1#TRPBF | 4.1V/cell fixed output; identical pinout, package, and temperature grade | Designed for older Li-ion chemistries requiring lower termination voltage | Select when battery specification mandates 4.1V/cell; no layout change required |
| BQ24725ARHBT | TI part with integrated ADC, SMBus interface, and built-in safety timers; 20-pin QFN but different pin mapping | Targets server/enterprise battery systems requiring firmware-configurable charge profiles and telemetry | Choose when digital configuration and fault logging are required; PCB redesign needed due to non-compatible pinout |
Compared with LTC4012IUF-2#TRPBF, the LTC4012IUF-1#TRPBF offers identical mechanical and thermal performance but targets legacy 4.1V/cell Li-ion cells, whereas BQ24725ARHBT adds digital control at the cost of analog flexibility and requires board-level redesign.
Availability
LTC4012IUF-2#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable medical instruments, battery backup systems, and industrial test equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC4012IUF-2#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) designs precision analog, mixed-signal, and power management ICs for high-reliability applications.
The LTC4012 family was developed as a flexible, high-efficiency battery charger controller platform supporting multi-chemistry charging with external algorithm management-targeting portable industrial, medical, and computing systems.
FAQ
What battery chemistries does the LTC4012IUF-2#TRPBF support?
The LTC4012IUF-2#TRPBF supports Li-ion and Li-polymer batteries exclusively, with fixed 4.2V/cell output optimized for modern high-energy-density cells. It does not support NiMH, lead-acid, or LiFePO₄ without external voltage scaling circuitry, as its internal FVS0/FVS1 logic and feedback reference are calibrated for 4.2V/cell nominal operation.
How does the LTC4012IUF-2#TRPBF implement PowerPath control without external components?
The LTC4012IUF-2#TRPBF integrates a dedicated INFET driver that controls an external PMOS transistor between DCIN and CLP. It actively regulates the PFET gate to maintain ~25mV forward voltage drop during charging and disables the FET in <6µs if reverse current is detected-eliminating need for external ideal diode controllers or discrete logic.
Can the LTC4012IUF-2#TRPBF be used without a microcontroller?
Yes-the LTC4012IUF-2#TRPBF operates autonomously as a complete charger controller: FVS0/FVS1 pins configure cell count and voltage, PROG/RIN/RSENSE set charge current, and CHRG/ICL provide status outputs. No MCU is required for basic constant-current/constant-voltage charging of 1–4-cell Li-ion packs.
What is the purpose of the ITH pin on the LTC4012IUF-2#TRPBF?
The ITH pin on the LTC4012IUF-2#TRPBF serves as the PWM current control node and loop compensation point. Its voltage sets the cycle-by-cycle peak inductor current threshold. An external RC network on ITH determines loop stability, soft-start duration, and transient response-making it essential for robust buck converter design.
Does the LTC4012IUF-2#TRPBF include built-in charge termination?
No-the LTC4012IUF-2#TRPBF intentionally omits built-in charge termination to maximize flexibility. It relies on external circuitry (e.g., MCU monitoring PROG voltage or CHRG state) to detect C/10 current and halt charging. This architecture supports custom termination algorithms for specialized battery types or aging compensation.
LTC4012IUF-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 16.8V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4012IUF-2#TRPBF FAQ
1.How can I place an order for LTC4012IUF-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012IUF-2#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 LTC4012IUF-2#TRPBF reliable?
The price and inventory of LTC4012IUF-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4012IUF-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4012IUF-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012IUF-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012IUF-2#TRPBF?
LTC4012IUF-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012IUF-2#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 LTC4012IUF-2#TRPBF?
For technical support, including LTC4012IUF-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012IUF-2#TRPBF requirements.
6.How does Aetrix verify that LTC4012IUF-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4012IUF-2#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 LTC4012IUF-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4012IUF-2#TRPBF?
All LTC4012IUF-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012IUF-2#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 LTC4012IUF-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4012IUF-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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