My Inquiry
My Account
Analog Devices Inc. LTC4012IUF-1#PBF
- Part No.:
- LTC4012IUF-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012IUF-1#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC4012IUF-1#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller optimized for Li-ion/polymer packs with 1–4 series cells. It delivers ±0.6% float voltage accuracy at 4.1V/cell, supports 6–28V input and 2–28V output ranges, features programmable AC adapter current limiting (±3% accuracy), and operates in a noise-free 550kHz quasi-constant-frequency PWM mode-enabling ceramic capacitor use in portable notebook and instrumentation power systems.
For engineers reviewing the LTC4012IUF-1#PBF datasheet, LTC4012IUF-1#PBF pinout, LTC4012IUF-1#PBF application, or LTC4012IUF-1#PBF equivalent, key selection criteria include its I-grade (–40°C to 125°C) operation, FVS0/FVS1 pin-programmable 4.1V/cell output, INFET-based PowerPath™ ideal diode control, analog charge current monitoring via PROG pin, and absence of built-in termination-requiring external MCU coordination for full charge algorithm execution.
Technical Context
The LTC4012IUF-1#PBF implements a current-mode synchronous buck topology with integrated gate drivers (TGATE/BGATE), internal 5V INTVDD regulator, and dual-loop control: peak inductor current regulation via ITH and battery voltage regulation via VFB (or FVS0/FVS1 on -1 variant). Its PowerPath™ architecture uses INFET to drive an external PMOS for <25mV forward drop and reverse current blocking below –25mV DCIN–CLP differential.
Charge termination is fully external: no C/10 auto-stop or temperature cutoff is embedded. Instead, CHRG provides three-state open-drain status (strong pull-down during bulk/constant-current, 25µA weak pull-down at C/10, high-Z near zero current), while ICL signals active input current limiting. The device requires external RSENSE, RIN, RPROG, and FBDIV divider (or FVS0/FVS1 logic) for full configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.1V per cell (pin-programmed via FVS0/FVS1); enables precise charging of 1–4S Li-ion packs without external DAC or MCU voltage scaling. |
| Float Voltage Accuracy | ±0.6% over –40°C to 125°C; ensures cell voltage stays within safe 4.076–4.124V range under thermal stress, critical for cycle life and safety compliance. |
| Switching Frequency | 550kHz typical; allows compact 6.8µH inductors and ceramic output capacitors, eliminating audible noise in quiet environments like medical instruments. |
| Input Current Limit Accuracy | ±3% via CLP–CLN sense; guarantees adapter power draw stays within specified limits (e.g., 2A USB-C PD source), preventing brownouts during system + battery load. |
| Charge Current Accuracy | ±4% (C-grade) / ±5% (I-grade); maintains consistent CC-phase current across temperature, essential for predictable state-of-charge progression in firmware-managed charging. |
| Operating Temperature | –40°C to 125°C junction; validated for industrial and automotive-adjacent applications where ambient extremes demand robust thermal margin. |
| Package | 20-pin 4mm × 4mm × 0.75mm QFN with exposed pad; provides low thermal resistance (θJA = 37°C/W) and space-efficient layout for thin-profile portable designs. |
Pinout & Package
20-pin (4mm × 4mm × 0.75mm) plastic QFN package with exposed GND paddle (Pin 21), rated for –40°C to 125°C operation. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Adapter current limit negative input | Sense node for input current regulation; threshold fixed at CLP – 100mV-must be filtered to reject switching noise. |
| CLP (2) | Adapter current limit positive input & power rail | Primary input supply pin (6–28V); powers internal circuits and serves as reference for CLN, INFET, and DCIN comparators. |
| INFET (3) | PowerPath ideal diode gate driver | Drives external PMOS gate to maintain ~25mV forward drop; clamped ~6V below CLP to prevent PFET overdrive. |
| DCIN (4) | DC adapter sense input | Monitors external DC source voltage; used with CLP to enable charger and assert ACP when DCIN > BAT + 500mV. |
| ACP (5) | AC present indicator (open-drain) | Active-low signal confirming valid adapter presence; transitions low when DCIN exceeds BAT by ≥500mV. |
| SHDN (6) | Active-low shutdown control | Pulled down internally (40kΩ); drives <300mV to force full shutdown, reducing battery drain to <1.5µA. |
| CHRG (7) | Charge status indicator (open-drain) | Three-state output: strong pull-down (CC phase), 25µA weak pull-down (C/10), high-Z (near end-of-charge). |
| ICL (8) | Input current limit indicator (open-drain) | Active-low flag signaling charge current reduction due to adapter current limiting-used for dynamic power budgeting. |
| FVS0 (9) | Battery voltage select LSB | Digital input (GND/INTVDD) selecting 4.1V/cell (00), 8.2V/cell (01), 12.3V/cell (10), or 16.4V/cell (11) for 1–4S configurations. |
| FVS1 (10) | Battery voltage select MSB | MSB of 2-bit voltage select; paired with FVS0 to configure nominal float voltage without external resistive dividers. |
| BAT (11) | Battery pack connection | Main battery voltage sensing node; used for PWM control, overvoltage protection (103–109% of selected VFLOAT), and current sense bias. |
| ITH (12) | PWM current loop compensation node | Internal error amplifier output controlling peak inductor current; external RC network sets loop stability and soft-start ramp rate. |
| PROG (13) | Charge current programming & monitor | Voltage output linearly proportional to charge current (e.g., 1.2V = 1A); used for both setting max current and real-time analog monitoring. |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; operating range extends 50mV below BAT to accommodate sense resistor common-mode shift. |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; complements CSN for differential current measurement with matched RIN resistors. |
| BGATE (16) | Synchronous rectifier NMOS gate driver | Drives low-side NFET in buck converter; 0–5V swing referenced to GND; must be floated if asynchronous diode is used. |
| INTVDD (17) | Internal 5V regulator output | Provides regulated 5V (±1%) for gate drivers and internal logic; shuts down in SHDN; capable of sourcing up to 20mA. |
| SW (18) | Buck switch node | High dv/dt node connecting TGATE-driven high-side NFET and inductor; requires tight layout and Kelvin sensing for stability. |
| TGATE (19) | High-side NMOS gate driver | Bootstrap-driven gate output (0 to CLN+5V); controls main buck switch; timing non-overlap prevents shoot-through. |
| BOOST (20) | TGATE bootstrap supply | Connects to bootstrap capacitor between SW and INTVDD; supplies floating gate drive voltage for TGATE during high-side conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable 4.1V/cell output | Eliminates external voltage-setting resistors and DACs for Li-ion 1–4S packs-reducing BOM count and layout complexity in cost-sensitive portable designs. |
| INFET-controlled PowerPath™ ideal diode | Enables seamless transition between adapter and battery power with <25mV forward drop and sub-6µs reverse current cutoff-critical for uninterrupted system operation during AC loss. |
| Analog charge current monitoring (PROG) | Provides ratiometric voltage output directly proportional to actual charge current, enabling real-time firmware-based charge profiling and safety checks without ADC oversampling. |
| No-audible-noise 550kHz PWM operation | Supports full-ceramic output filtering (no electrolytics), reducing board area, improving reliability, and meeting acoustic requirements in medical and audio equipment. |
| External algorithm flexibility | Delivers raw control signals (CHRG, ICL, ACP) and analog monitors (PROG, VFB) but omits fixed termination-allowing custom charge profiles (e.g., pulse charging, impedance tracking) via host MCU. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-power notebook with AC adapter and removable Li-ion battery pack requiring seamless switchover and thermal-safe charging. IC Role / Device Role / Timing Role: Primary battery charger controller managing constant-current/constant-voltage stages, input current limiting, and PowerPath™ ideal diode sequencing. Use Value: Enables 4.1V/cell charging for longer cycle life versus 4.2V, reduces heat generation via synchronous buck efficiency (>90% at 2A), and eliminates audible coil whine in quiet office environments. |
Use Scenario: Handheld multimeter or oscilloscope with rechargeable 2S Li-ion battery and USB-C input, needing accurate SOC estimation and field-replaceable battery support. IC Role / Device Role / Timing Role: Configurable charger IC providing analog current monitoring (PROG), C/10 detection (CHRG), and adapter presence (ACP) for embedded battery management firmware. Use Value: Delivers ±5% charge current accuracy across –40°C to 125°C for reliable calibration during extended field use, and supports firmware-defined trickle/CC/CV/cool-down phases. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: Rack-mounted UPS or telecom backup unit using 4S Li-ion for extended runtime, requiring high-efficiency charging and strict input current capping from shared PSUs. IC Role / Device Role / Timing Role: High-accuracy charger controller implementing adaptive input current limiting (ICL) and battery overvoltage protection (106% of VFLOAT) to prevent cell damage during grid fluctuations. Use Value: Maintains ±3% input current regulation to avoid tripping upstream 12V/5A power supplies, while delivering 95% peak efficiency at 3A to minimize thermal load in enclosed enclosures. |
Use Scenario: Ruggedized warehouse scanner or handheld HMI with wide-temperature operation and hot-swap battery capability. IC Role / Device Role / Timing Role: Industrial-grade charger IC providing –40°C to 125°C operation, robust ESD-tolerant pins (±2kV HBM), and latchable CHRG status for firmware fault logging. Use Value: Ensures reliable charging initiation at –30°C ambient (validated I-grade performance), and INFET's sub-6µs reverse cutoff prevents data corruption during battery hot-swap events. |
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#PBF | Adjustable output voltage (via VFB/FBDIV resistor divider); no pin-programmed chemistry presets. | Requires external resistors to set float voltage; better suited for multi-chemistry (LiFePO₄, NiMH) or non-standard Li-ion voltages. | Select when flexibility across battery chemistries or custom VFLOAT values (e.g., 3.65V/cell) is required over fixed 4.1V/cell simplicity. |
| LTC4012IUF-2#PBF | Pin-programmable 4.2V/cell output; identical pinout, package, and temperature grade. | Targets standard 4.2V/cell Li-ion packs; higher voltage increases energy density but reduces cycle life vs. 4.1V/cell. | Select for maximum capacity in consumer devices where cycle life >500 cycles is secondary to runtime; verify cell datasheet supports 4.2V absolute max. |
Compared with LTC4012IUF#PBF, the LTC4012IUF-1#PBF trades resistor-divider design effort for guaranteed 4.1V/cell accuracy and reduced component count, while LTC4012IUF-2#PBF offers higher voltage for capacity-critical applications-making the -1 variant optimal for industrial longevity-focused deployments.
Availability
LTC4012IUF-1#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery backup systems requiring stable component supply, extended temperature operation, and precision Li-ion charging control.
Supply support for LTC4012IUF-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4012 family was designed as a flexible, high-accuracy battery charger controller platform for portable and industrial systems requiring external algorithm control, PowerPath™ power routing, and wide-input synchronous buck conversion.
FAQ
What battery chemistries does the LTC4012IUF-1#PBF support?
The LTC4012IUF-1#PBF supports any rechargeable battery chemistry-including Li-ion, Li-polymer, LiFePO₄, and NiMH-because it lacks built-in termination logic. Its 4.1V/cell output is optimized for Li-ion/polymer, but the external MCU can adapt charge profiles by interpreting CHRG, ICL, and PROG signals. For LiFePO₄, users reconfigure FVS0/FVS1 or replace with LTC4012IUF#PBF for adjustable VFB.
Does the LTC4012IUF-1#PBF include automatic charge termination?
No, the LTC4012IUF-1#PBF does not include automatic charge termination. It provides C/10 detection via CHRG's weak pull-down state and analog current monitoring via PROG, but final termination decisions (e.g., timer cutoff, temperature-based stop) must be implemented externally-typically by an MCU reading CHRG, PROG, and thermistor inputs.
How is the 4.1V/cell output configured on the LTC4012IUF-1#PBF?
The LTC4012IUF-1#PBF uses FVS0 (Pin 9) and FVS1 (Pin 10) as digital inputs to select 4.1V/cell: tie both to GND for 1S (4.1V), FVS0=GND/FVS1=INTVDD for 2S (8.2V), FVS0=INTVDD/FVS1=GND for 3S (12.3V), or both to INTVDD for 4S (16.4V). No external resistors are needed-unlike the base LTC4012IUF#PBF which requires VFB/FBDIV divider.
What is the role of the INFET pin on the LTC4012IUF-1#PBF?
The INFET pin (Pin 3) on the LTC4012IUF-1#PBF drives the gate of an external PMOS transistor to implement PowerPath™ ideal diode functionality. It regulates the forward voltage drop between DCIN and CLP to ~25mV during charging and disables the PFET in <6µs if reverse current is detected-ensuring seamless AC/battery switchover and preventing backfeed into the adapter.
Can the LTC4012IUF-1#PBF operate with ceramic output capacitors?
Yes, the LTC4012IUF-1#PBF operates with ceramic output capacitors due to its 550kHz quasi-constant-frequency PWM architecture, which avoids sub-audible switching frequencies that cause piezoelectric noise in ceramics. Typical designs use 20µF X5R/X7R ceramics at the output, eliminating bulky and less-reliable electrolytic capacitors.
LTC4012IUF-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4012IUF-1#PBF FAQ
1.How can I place an order for LTC4012IUF-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012IUF-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 LTC4012IUF-1#PBF reliable?
The price and inventory of LTC4012IUF-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 LTC4012IUF-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4012IUF-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012IUF-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012IUF-1#PBF?
LTC4012IUF-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012IUF-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 LTC4012IUF-1#PBF?
For technical support, including LTC4012IUF-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012IUF-1#PBF requirements.
6.How does Aetrix verify that LTC4012IUF-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4012IUF-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 LTC4012IUF-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4012IUF-1#PBF?
All LTC4012IUF-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012IUF-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 LTC4012IUF-1#PBF part is unused and in its original packaging.
Return procedure for LTC4012IUF-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4012IUF-1#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…
