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Analog Devices Inc. LTC4012IUF-3#PBF
- Part No.:
- LTC4012IUF-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012IUF-3#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LTC4012IUF-3#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller supporting Li-ion, Li-polymer, and other multi-chemistry batteries. It delivers ±0.5% float voltage accuracy, programmable charge current with 4% accuracy, and 550kHz quasi-constant-frequency PWM operation - enabling high-efficiency, low-noise charging in notebook computers and portable instruments.
For engineers reviewing the LTC4012IUF-3#PBF datasheet, LTC4012IUF-3#PBF pinout, LTC4012IUF-3#PBF application, or LTC4012IUF-3#PBF equivalent, key selection considerations include its wide 2V–28V output voltage range, external AC adapter current limiting (±3% accuracy), INFET ideal diode PowerPath™ control, analog charge current monitoring via PROG pin, and –40°C to 125°C industrial temperature grade.
Technical Context
The LTC4012IUF-3#PBF implements current-mode PWM control with a 550kHz nominal switching frequency and non-overlap gate drive (110ns) for synchronous N-channel MOSFETs. Its error amplifier compares VFB (1.2085V reference) against a resistor-divided BAT voltage to regulate constant-voltage charge, while PROG voltage reflects real-time charge current scaled by RPROG.
It integrates dual-loop regulation: one path controls charge current via CSP/CSN sensing and ITH-based peak-current limiting; another enforces input current limit using CLP/CLN differential sensing. The INFET driver provides active forward-voltage regulation (~25mV) and reverse-current blocking (<6µs turn-off) between DCIN and CLP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous buck (current-mode PWM) with external N-FETs and P-FET PowerPath control |
| Output Voltage Range | 2V to 28V - fully adjustable via external FBDIV–GND divider; supports Li-ion, LiFePO₄, NiMH, and lead-acid chemistries |
| Charge Voltage Accuracy | ±0.5% (I-grade) - ensures precise CV termination critical for cell longevity and safety compliance |
| Charge Current Accuracy | ±4% (I-grade) - set by RSENSE, RIN, and RPROG; enables repeatable C-rate control across temperature |
| Input Current Limit Accuracy | ±3% - programmed via CLP–CLN differential; prevents AC adapter overload without MCU intervention |
| Switching Frequency | 467–633 kHz - fixed-frequency operation avoids audible noise with ceramic capacitors and simplifies EMI filtering |
| Operating Temperature | –40°C to 125°C - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
20-pin 4mm × 4mm × 0.75mm QFN package with exposed thermal pad (Pin 21 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative | Differential input for AC adapter current limiting; threshold = CLP – 100mV |
| CLP (2) | Current limit sense positive / power input | Main adapter input rail (6V–28V); powers internal circuits and sets ICL threshold |
| INFET (3) | PowerPath ideal diode gate driver | Drives external PMOS to maintain ~25mV forward drop and block reverse current |
| DCIN (4) | DC input sense | Monitors presence of external DC source; enables charging when DCIN > BAT + 500mV |
| GND (5) | Signal and power ground | Reference for all analog circuitry; connected internally to exposed pad (Pin 21) |
| SHDN (6) | Active-low shutdown control | Pulls below 300mV to force shutdown; 40kΩ internal pull-down |
| CHRG (7) | Open-drain charge status indicator | Three-state output: strong pull-down (bulk), 25µA weak pull-down (C/10), or high-Z (shutdown) |
| ICL (8) | Open-drain input current limit indicator | Active-low signal indicates charge current reduction due to AC adapter current limiting |
| VFB (9) | Battery voltage feedback input | Connects to center tap of FBDIV–GND divider; regulated to 1.2085V in CV mode |
| FBDIV (10) | Feedback divider source | Open-drain PFET output tied to BAT during charging; completes resistor divider network |
| BAT (11) | Battery pack connection | Primary battery voltage sensing node; used for PWM control and overvoltage protection |
| ITH (12) | PWM compensation and current limit node | Integrates EA output; sets peak inductor current threshold; requires external RC compensation |
| PROG (13) | Charge current programming & monitor | Voltage proportional to actual charge current; used for programming and real-time monitoring |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; common-mode range extends 50mV below BAT |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; common-mode range extends 200mV above BAT |
| BGATE (16) | Bottom N-FET gate driver | Drives synchronous rectifier FET; GND to INTVDD swing; disable by leaving floating |
| INTVDD (17) | Internal 5V regulator output | Provides 4.85–5.15V supply for gate drivers; shuts down in SHDN mode |
| SW (18) | Switch node | Connection point for external inductor and bootstrap capacitor; critical for layout and EMI |
| TGATE (19) | Top N-FET gate driver | Drives main switching FET; swing up to CLN + 5V; disable by leaving floating |
| BOOST (20) | Bootstrap supply input | Accepts charge from SW–INTVDD bootstrap network; operates from INTVDD – 1V to CLN + 5V |
Key Features
| Feature | Design Value |
|---|---|
| No-audible-noise PWM | Quasi-constant 550kHz frequency enables use of ceramic bulk capacitors without acoustic noise |
| PowerPath™ ideal diode control | INFET driver maintains ~25mV forward drop and blocks reverse current in <6µs |
| Analog charge current monitor | PROG pin outputs linear voltage proportional to real-time charge current (±4% accuracy) |
| Programmable input current limit | CLP/CLN differential sensing with ±3% accuracy prevents AC adapter overload autonomously |
| Micropower shutdown | Battery leakage <1.5µA (I-grade) extends standby time in portable applications |
| Robust non-overlap control | 110ns minimum dead time prevents shoot-through in synchronous N-FET power stage |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-input (AC adapter + battery) power management in ultraportable laptops with thermal constraints. IC Role / Device Role / Timing Role: Primary battery charger controller managing CV/CC profiles, input current limiting, and seamless PowerPath switchover. Use Value: Enables 95% peak efficiency at 2A charge current and eliminates audible capacitor squeal - critical for fanless designs. |
Use Scenario: Field-deployable handheld test equipment requiring long runtime and reliable battery conditioning. IC Role / Device Role / Timing Role: Multi-chemistry charger controller interfaced to MCU for adaptive NiMH/Li-ion algorithms and C/10 termination detection. Use Value: PROG pin analog monitoring and CHRG three-state output simplify firmware state machine design without ADC or GPIO expansion. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: Uninterruptible power supply for PLC I/O modules operating in harsh environments (-40°C to 85°C). IC Role / Device Role / Timing Role: High-accuracy CV regulator (±0.5%) and robust input current limiting ensure safe charging under variable AC line conditions. Use Value: Wide 6V–28V input range accommodates 12V/24V industrial adapters; I-grade temp rating guarantees reliability across operating envelope. |
Use Scenario: Ruggedized warehouse scanners with hot-swap battery support and USB-C PD compatibility. IC Role / Device Role / Timing Role: Charger controller coordinating with host MCU to manage simultaneous system load and battery recharge from limited-power sources. Use Value: ICL indicator and programmable input current limit allow dynamic power budgeting - preventing brownouts during high-current barcode scanning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24725ARHBT | Integrated MOSFET drivers only; no INFET ideal diode control; 3.3V–28V input; 1% VBAT accuracy | Lacks PowerPath™ functionality - requires external ideal diode or OR-ing controller for AC/battery switchover | Choose when integrated gate drivers suffice and external PowerPath is acceptable; lower BOM count but higher system complexity |
| MP2722GQZ | Single-chip solution with integrated power FETs; 4.5V–28V input; ±0.5% VBAT accuracy; no external RSENSE required | Not a controller - limits max charge current to 3A; unsuitable for >3A or custom FET selection | Choose for compact, cost-sensitive designs where 3A max current and integrated FETs meet requirements |
Compared with BQ24725ARHBT and MP2722GQZ, the LTC4012IUF-3#PBF offers unique PowerPath™ ideal diode control, full flexibility in external FET selection, and independent programmability of both charge and input current limits - making it optimal for high-reliability, thermally constrained, or multi-chemistry applications requiring architectural control.
Availability
LTC4012IUF-3#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, extended temperature operation, and long-term industrial lifecycle support.
Supply support for LTC4012IUF-3#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4012IUF-3#PBF belongs to ADI's Linear Technology legacy battery management portfolio, designed specifically for high-efficiency, flexible, multi-chemistry battery charging in space- and thermal-constrained portable and industrial systems.
FAQ
What battery chemistries does the LTC4012IUF-3#PBF support?
The LTC4012IUF-3#PBF supports Li-ion, Li-polymer, LiFePO₄, NiMH, and lead-acid batteries. It lacks built-in charge termination, so external microcontroller or analog circuitry must implement full charge algorithms. Its wide 2V–28V output voltage range and programmable current/voltage thresholds make it adaptable to diverse chemistries - confirmed in the device's Applications section and typical circuit examples.
How does the LTC4012IUF-3#PBF implement PowerPath™ control?
The LTC4012IUF-3#PBF uses its INFET pin to drive an external PMOS transistor between DCIN and CLP, regulating forward voltage to ~25mV and blocking reverse current in <6µs. This enables seamless switchover between AC adapter and battery without system interruption. The function is documented in Pin Functions, Operation, and Absolute Maximum Ratings sections - distinct from simple OR-ing controllers due to active voltage regulation.
Can the LTC4012IUF-3#PBF operate without an external microcontroller?
Yes - the LTC4012IUF-3#PBF can operate autonomously for basic CC/CV charging with fixed parameters. However, full charge management (e.g., C/10 termination, temperature cutoff, or chemistry-specific profiles) requires external control. Its CHRG and ICL indicators, PROG monitoring, and SHDN input are designed for easy MCU interface - but standalone operation is viable for simple applications per the Typical Application schematic.
What is the purpose of the FBDIV pin on the LTC4012IUF-3#PBF?
The FBDIV pin on the LTC4012IUF-3#PBF serves as the high-side connection for the external resistor divider that sets battery float voltage. During charging, it is actively pulled to BAT via an internal open-drain PFET, completing the divider network referenced to VFB (1.2085V). This architecture allows accurate voltage programming independent of BAT loading - verified in Electrical Characteristics (VBOV, RON) and Pin Functions descriptions.
Does the LTC4012IUF-3#PBF include built-in charge termination?
No - the LTC4012IUF-3#PBF does not include built-in charge termination. As explicitly stated in the Description and Operation sections, it is a "building block IC intended for use with an external circuit, such as a microcontroller, capable of managing the entire algorithm required for the specific battery." Termination logic (e.g., C/10 detection, timer cutoff, or temperature monitoring) must be implemented externally using CHRG, PROG, or other signals.
LTC4012IUF-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage, Reverse Current
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- 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-3#PBF FAQ
1.How can I place an order for LTC4012IUF-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012IUF-3#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 LTC4012IUF-3#PBF reliable?
The price and inventory of LTC4012IUF-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4012IUF-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC4012IUF-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012IUF-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012IUF-3#PBF?
LTC4012IUF-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012IUF-3#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 LTC4012IUF-3#PBF?
For technical support, including LTC4012IUF-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012IUF-3#PBF requirements.
6.How does Aetrix verify that LTC4012IUF-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4012IUF-3#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 LTC4012IUF-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC4012IUF-3#PBF?
All LTC4012IUF-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012IUF-3#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 LTC4012IUF-3#PBF part is unused and in its original packaging.
Return procedure for LTC4012IUF-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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