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Analog Devices Inc. LTC4012CUF-1#PBF
- Part No.:
- LTC4012CUF-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012CUF-1#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
LTC4012CUF-1#PBF from Analog Devices (formerly Linear Technology) is a pin-programmable, synchronous buck battery charger controller for Li-ion/polymer packs. It delivers ±0.6% float voltage accuracy at 4.1V/cell, supports 6V–28V input and 2V–28V output ranges, and features INFET-based PowerPath™ control with 25mV forward regulation - used in notebook computers and portable instruments requiring precise multi-cell charging without built-in termination.
For engineers reviewing the LTC4012CUF-1#PBF datasheet, LTC4012CUF-1#PBF pinout, LTC4012CUF-1#PBF application, or LTC4012CUF-1#PBF equivalent, key selection criteria include its 4.1V/cell fixed output setting, 550kHz quasi-constant-frequency PWM topology, ±4% charge current accuracy, AC adapter current limiting with ICL status indication, and 20-pin 4mm × 4mm QFN package with exposed thermal pad.
Technical Context
The LTC4012CUF-1#PBF implements a current-mode synchronous buck regulator with external MOSFET drive (TGATE/BGATE), using ITH as the peak-current-controlled compensation node. Its PowerPath™ architecture integrates an ideal diode controller (INFET) that regulates DCIN-to-CLP forward drop to ~25mV and blocks reverse current within 6µs when DCIN falls below CLP by >25mV.
Unlike the base LTC4012, the -1 variant replaces VFB/FBDIV with digital FVS0/FVS1 pins to select 4.1V/cell output for 1–4-series Li-ion packs - eliminating external resistor dividers while maintaining ±0.6% voltage accuracy over temperature. Charge termination remains fully external, requiring host MCU coordination via CHRG, ICL, and ACP status outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.1V per cell (pin-programmed via FVS0/FVS1); enables direct configuration for 4.1V/cell Li-ion packs without external feedback resistors. |
| Charge Current Accuracy | ±4% (C-grade); ensures predictable bulk charge rate when set by RPROG, RIN, and RSENSE. |
| Input Voltage Range | 6V to 28V (DCIN/CLP); supports wide-range AC adapters and industrial power supplies. |
| Switching Frequency | 550kHz typical; enables compact magnetics and ceramic output capacitors without audible noise. |
| PowerPath Control | INFET output regulates forward voltage to 25mV and disables in <6µs on reverse bias; eliminates need for external ideal diode IC. |
| Float Voltage Accuracy | ±0.6% over 0°C to 85°C; guarantees tight cell voltage matching critical for battery longevity and safety compliance. |
| Package | 20-pin 4mm × 4mm × 0.75mm QFN with exposed GND pad; provides low thermal resistance (θJA = 37°C/W) for high-power charging. |
Pinout & Package
20-pin (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND), rated for 0°C to 85°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Adapter current limit negative sense | Senses voltage 100mV below CLP to trigger input current limiting; requires external RC filter for noise immunity. |
| CLP (2) | Adapter input positive supply/sense | Primary power source input (6V–28V); powers internal circuits and sets current limit threshold. |
| INFET (3) | PowerPath PFET gate driver | Drives external PMOS to maintain 25mV forward drop; clamped ~6V below CLP for safe gate control. |
| DCIN (4) | DC input voltage sense | Monitors adapter presence relative to CLP; enables charger only when DCIN > CLP + 60mV. |
| ACP (5) | AC adapter present indicator | Open-drain output active-low when DCIN > BAT + 500mV; signals host system of valid adapter connection. |
| SHDN (6) | Active-low shutdown control | Pulled down internally (40kΩ); forces full shutdown when <300mV, reducing battery leakage to <1.5µA. |
| CHRG (7) | Charge status indicator | Three-state open-drain: strong pull-down (charging), 25µA weak pull-down (C/10), high-Z (not charging). |
| ICL (8) | Input current limit indicator | Active-low open-drain flag indicating charge current reduction due to adapter current limiting. |
| FVS0 (9) | Battery voltage select LSB | Digital input (GND/INTVDD) selecting one of four preset voltages; for LTC4012CUF-1#PBF, configures 4.1V/cell mode. |
| FVS1 (10) | Battery voltage select MSB | Digital input (GND/INTVDD) completing 2-bit selection; FVS1=0V, FVS0=0V sets 4.1V/cell for 1–4S Li-ion. |
| BAT (11) | Battery pack connection | Direct connection to battery terminal; used for voltage feedback loop and current sensing reference. |
| ITH (12) | PWM current control node | Compensation pin for current-mode loop; voltage ramp controls peak inductor current per cycle. |
| PROG (13) | Charge current programming/monitoring | Voltage output linearly proportional to charge current (11.67µA/mV); enables real-time analog monitoring. |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; operates within (BAT – 50mV) to (BAT + 200mV) common-mode range. |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; matched with CSN for accurate differential current measurement. |
| BGATE (16) | Synchronous rectifier NFET driver | Drives bottom FET in buck converter; improves efficiency vs. diode rectification, especially at high currents. |
| INTVDD (17) | Internal 5V regulator output | Supplies 5V ±1% (4.85–5.15V) to gate drivers; shuts down during SHDN; max load 20mA. |
| SW (18) | Buck switch node | High dv/dt node connecting to inductor; requires careful PCB layout and Kelvin routing for stability. |
| TGATE (19) | Top-side NFET gate driver | Drives high-side buck switch; rail-to-rail swing up to CLN + 5V; requires bootstrap capacitor on BOOST. |
| BOOST (20) | TGATE bootstrap supply | Connects to bootstrap capacitor between SW and INTVDD; sustains TGATE drive during high-side conduction. |
| GND (21) | Ground reference / thermal pad | Exposed paddle; must be soldered to large PCB copper area for thermal management and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable 4.1V/cell output | Eliminates external feedback resistors for Li-ion packs; FVS0/FVS1 pins directly configure 4.1V/cell across 1–4 series cells. |
| INFET PowerPath™ control | Integrates ideal diode function with 25mV forward regulation and sub-6µs reverse blocking - reduces BOM count and improves system efficiency. |
| 550kHz synchronous buck topology | Enables use of small inductors and ceramic capacitors without audible switching noise - critical for portable audio-sensitive applications. |
| Analog charge current monitor | PROG pin provides linear voltage output (11.67µA/mV) proportional to actual charge current - simplifies closed-loop host MCU control. |
| AC adapter current limiting | Programmable input current limit (via RIN) with ICL status flag - prevents adapter overload while maximizing charge rate under constrained input power. |
| Micropower shutdown | Reduces battery leakage to ≤1.5µA during shutdown - extends shelf life and standby time in battery-backed systems. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Charging 3-cell Li-ion battery packs (12.3V nominal) from universal AC adapters with variable input voltage (12–24V). IC Role / Device Role / Timing Role: Primary battery charger controller managing constant-current/constant-voltage profile, PowerPath™ input selection, and host MCU communication via status pins. Use Value: Enables fast, efficient charging with 4.1V/cell precision and automatic adapter current limiting - avoids thermal throttling and adapter brownouts during simultaneous system operation. |
Use Scenario: Rechargeable handheld test equipment with dual power sources (AC adapter and removable Li-ion pack). IC Role / Device Role / Timing Role: Dual-role power manager: charges battery while powering system via PowerPath™, and seamlessly transitions to battery-only operation when adapter is removed. Use Value: INFET-controlled ideal diode ensures <25mV forward drop and zero reverse leakage - maximizes runtime and eliminates need for discrete OR-ing FETs or diodes. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: UPS-style backup for 4S Li-ion (16.4V) in telecom edge devices requiring uninterrupted operation during grid failure. IC Role / Device Role / Timing Role: High-accuracy charger controller coordinating with system MCU to implement custom charge algorithms and state-of-charge estimation. Use Value: ±0.6% voltage accuracy and ±4% current accuracy ensure consistent cell balancing and long-term cycle life - critical for mission-critical backup reliability. |
Use Scenario: Ruggedized warehouse scanners with hot-swappable batteries and USB-C PD input compatibility. IC Role / Device Role / Timing Role: Flexible charger supporting multiple battery configurations (1S–4S) via FVS0/FVS1 pins, with PROG-based current monitoring for adaptive charge rate control. Use Value: Pin-selectable 4.1V/cell mode allows single BOM to support both legacy and newer Li-ion chemistries - reducing inventory complexity and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4012CUF#PBF | Adjustable output voltage via VFB/FBDIV resistor divider; no fixed 4.1V/cell setting. | Requires external resistors to set float voltage; better suited for non-standard chemistries or custom voltage profiles. | Select when design requires programmable output voltage beyond standard Li-ion levels (e.g., LiFePO4, NiMH, or custom Li-ion). |
| LTC4012CUF-2#PBF | Pin-programmed 4.2V/cell output instead of 4.1V/cell; identical pinout and feature set. | Designed for higher-capacity Li-ion cells requiring 4.2V/cell termination; not interchangeable without battery chemistry validation. | Select only for 4.2V/cell Li-ion packs; verify cell manufacturer's voltage specification before substitution. |
Compared with LTC4012CUF#PBF, the LTC4012CUF-1#PBF saves board space and calibration effort by embedding 4.1V/cell precision in hardware, while LTC4012CUF-2#PBF offers identical functionality at 4.2V/cell - making all three variants distinct choices based on exact cell voltage requirements, not drop-in replacements.
Availability
LTC4012CUF-1#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC4012CUF-1#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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision industrial, automotive, and communications applications.
The LTC4012 family was developed as a flexible, high-efficiency battery charger controller platform - enabling system designers to implement custom charge algorithms for diverse chemistries while minimizing external components and thermal overhead.
FAQ
What battery chemistries does the LTC4012CUF-1#PBF support?
The LTC4012CUF-1#PBF supports any rechargeable battery chemistry requiring constant-current/constant-voltage charging, including Li-ion, Li-polymer, and custom configurations. Its 4.1V/cell output is optimized for specific Li-ion cells; however, termination logic and safety cutoffs must be implemented externally via host MCU since the LTC4012CUF-1#PBF itself has no built-in charge termination.
How is the 4.1V/cell output configured on the LTC4012CUF-1#PBF?
The LTC4012CUF-1#PBF uses dedicated FVS0 and FVS1 pins to digitally select its 4.1V/cell output - no external resistors are needed. For this variant, tying both FVS0 and FVS1 to GND configures the device for 4.1V/cell across 1–4 series-connected cells, as specified in the Absolute Maximum Ratings table and confirmed in the Pin Functions section.
Does the LTC4012CUF-1#PBF include integrated MOSFETs?
No, the LTC4012CUF-1#PBF is a controller-only IC and does not integrate power MOSFETs. It drives external N-channel high-side (TGATE) and synchronous rectifier (BGATE) FETs, plus an external P-channel input FET via INFET - enabling scalable power handling and thermal optimization based on application requirements.
What is the purpose of the INFET pin on the LTC4012CUF-1#PBF?
The INFET pin on the LTC4012CUF-1#PBF drives the gate of an external P-channel MOSFET to implement ideal diode functionality between DCIN and CLP. It actively regulates the forward voltage drop to ~25mV during charging and disables the FET in less than 6µs if reverse current is detected - preventing battery discharge back into the adapter and improving overall system efficiency.
Can the LTC4012CUF-1#PBF operate without an external microcontroller?
The LTC4012CUF-1#PBF can perform basic charging functions autonomously (e.g., CC/CV regulation, PowerPath™ control, status indication), but it lacks built-in charge termination, temperature monitoring, or safety cutoffs. Full battery management - including end-of-charge detection, fault recovery, and cell balancing - requires coordination with an external microcontroller using CHRG, ICL, and ACP signals.
LTC4012CUF-1#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:
- 1 ~ 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 16.4V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4012CUF-1#PBF FAQ
1.How can I place an order for LTC4012CUF-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012CUF-1#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 LTC4012CUF-1#PBF reliable?
The price and inventory of LTC4012CUF-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4012CUF-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4012CUF-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012CUF-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012CUF-1#PBF?
LTC4012CUF-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012CUF-1#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 LTC4012CUF-1#PBF?
For technical support, including LTC4012CUF-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012CUF-1#PBF requirements.
6.How does Aetrix verify that LTC4012CUF-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4012CUF-1#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 LTC4012CUF-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4012CUF-1#PBF?
All LTC4012CUF-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012CUF-1#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 LTC4012CUF-1#PBF part is unused and in its original packaging.
Return procedure for LTC4012CUF-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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