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Analog Devices Inc. LTC4013EUFD#PBF
- Part No.:
- LTC4013EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4013EUFD#PBF.pdf
- Description:
- IC BATT CHG MULT-CHEM 6CEL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,862
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Product details
Overview
LTC4013EUFD#PBF from Analog Devices (formerly Linear Technology) is a 60V synchronous buck multi-chemistry battery charger IC optimized for lead-acid (vented/sealed) and Li-Ion/LiFePO₄ batteries. It delivers up to 5A charge current using external N-channel MOSFETs, supports bulk/absorption/float/equalization profiles, features ±0.5% float voltage accuracy, MPPT input regulation, and NTC temperature compensation. It is used in solar-powered systems, UPS backup, and industrial battery charging.
For engineers reviewing the LTC4013EUFD#PBF datasheet, LTC4013EUFD#PBF pinout, LTC4013EUFD#PBF application, or LTC4013EUFD#PBF equivalent, key selection criteria include its 4.5V–60V input range, 2.4V–60V battery voltage support, resistor-programmable switching frequency (200kHz–1MHz), dual open-drain status outputs, and thermally enhanced 28-lead 4mm × 5mm QFN package with exposed SGND pad.
Technical Context
The LTC4013EUFD#PBF implements a fixed-frequency average-current-mode synchronous buck controller with dual error amplifiers: one for constant-current regulation (servoing SENSE–BAT to 50mV) and another for constant-voltage regulation (FB pin referenced to programmable 2.178V–2.627V thresholds). Its MPPT loop samples DCIN every 10.2s, stores open-circuit voltage via internal DAC, and regulates charge current to maintain user-defined input voltage percentage.
It integrates dedicated circuitry for lead-acid 4-stage charging (bulk→absorption→equalization→float), including safety timer control (TMR capacitor), low-battery restart (LB pin with 20µA current source), and NTC-based temperature-compensated voltage scaling (0.21 V/V gain, ±15mV offset). The INFET gate driver enables reverse-blocking power-path control, while BST/TG/BG pins drive external high-side and low-side N-MOSFETs with non-overlap timing (40ns/74ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide-range sources including solar panels and industrial DC rails. |
| Battery Voltage Range | 2.4V to 60V - accommodates 1–16-cell lead-acid or 1–15S Li-Ion configurations. |
| Charge Current Accuracy | ±5% - determined by external sense resistor tolerance and 50mV current-sense reference. |
| Float Voltage Accuracy | ±0.5% - ensures precise long-term maintenance of sealed/vented lead-acid batteries. |
| Switching Frequency Range | 200kHz to 1MHz - set by RT resistor or synchronized externally via SYNC pin. |
| MPPT Sampling Interval | 10.2s - periodic open-circuit voltage measurement with minimal impact on charge continuity. |
| Thermal Package | 28-lead 4mm × 5mm QFN with exposed SGND pad - θJA = 43°C/W, rated for –40°C to 125°C junction operation. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed SGND pad (Pin 29), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INFET (1) | Input PowerPath MOSFET gate drive | Drives external N-MOSFET to block reverse current when DCIN < VBAT; includes internal charge pump. |
| DCIN (2) | Input supply sense and INFET charge pump supply | Senses input voltage for INFET control and powers INFET gate driver; absolute max 60V. |
| MPPT (3), FBOC (4) | MPPT regulation loop set-point inputs | FBOC sets target % of open-circuit voltage; MPPT compares real-time DCIN to stored DAC value. |
| ENAB (5) | Precision enable threshold input | 1.22V rising threshold with 170mV hysteresis; disables all charging and reduces quiescent current to 4µA. |
| ISMON (6) | Charge current monitor output | Voltage = 20 × (VSENSE – VBAT); provides analog current monitoring without additional op-amp. |
| STAT0, STAT1 (7,8) | Open-drain status outputs | Indicate charge state (e.g., charging, float, fault); each sinks up to 5mA for direct LED drive. |
| TMR (10) | Timer capacitor connection | Capacitor to ground sets absorption/equalization timeout (e.g., 0.2µF → 3.03hr EOC, 0.758hr EQ). |
| MODE1, MODE2 (11,12) | Charge algorithm selection | Tri-state inputs selecting 2-/3-/4-stage lead-acid or Li-Ion profiles; floating/mid/high thresholds define mode. |
| RT (15) | Switching frequency programming | Resistor to ground sets oscillator frequency; 40.2kΩ → 1MHz, 232kΩ → 200kHz. |
| NTC (17) | Thermistor interface | Accepts NTC divider to scale FB voltage with temperature; disabled if >3.3V (e.g., strap to INTVCC for Li-Ion). |
| FB (18) | Constant-voltage feedback input | Regulates battery voltage via resistor divider; reference levels range from 2.178V (LiFePO₄) to 2.627V (EQ). |
| SENSE, BAT (19,20) | Current sense differential inputs | 50mV servo voltage sets ICHGMAX = 50mV/RSENSE; overcurrent shutdown at 100mV. |
| BST (21), TG (22), BG (24) | High-side gate drive supply and MOSFET drivers | BST supplies 5V boost for TG; TG/BG drive external N-MOSFETs with non-overlap timing and <4Ω RDS(ON) drive. |
| INTVCC (25) | Internal 5V LDO output | Powers internal logic/analog circuits; supplies BST refresh diode anode and requires ceramic bypass to PGND. |
| PGND (26) | Power ground | Return path for BG driver only; separate from SGND to minimize noise coupling into sensitive analog nodes. |
| VIN (27), VIN_S (28) | Main input supply and Kelvin sense | VIN powers INTVCC regulator; VIN_S provides remote sensing for INFET control loop accuracy. |
| SGND (29) | Signal ground reference | Quiet ground for FB, MPPT, NTC dividers; must connect to battery negative and decoupling cap cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-chemistry charge algorithms | Configurable 2/3/4-stage lead-acid (with equalization) and Li-Ion/LiFePO₄ via MODE1/MODE2 pins. |
| MPPT input regulation | 10.2s periodic sampling with DAC storage enables solar panel power optimization without external MCU. |
| NTC temperature compensation | 0.21 V/V gain and programmable offset allow precise –25mV/°C to +25mV/°C float voltage adjustment. |
| Dual open-drain status outputs | STAT0/STAT1 provide real-time state indication (e.g., CHARGING, FLOAT, FAULT) with 5mA sink capability. |
| External MOSFET control | Independent TG/BG drivers with non-overlap timing and low RDS(ON) drive support high-efficiency >5A designs. |
| Low-power burst mode | Activates under low-light MPPT conditions (ΔV < 32mV) and low current (< C/10), reducing switching losses. |
Applications
| Solar-Powered Battery Charging | UPS and Backup Power Systems |
|---|---|
|
Use Scenario: Off-grid solar installation with 24V/48V lead-acid battery bank and variable irradiance. IC Role / Device Role / Timing Role: Primary battery charger IC managing MPPT-regulated buck conversion, 4-stage charging, and temperature-compensated float voltage. Use Value: Maintains >95% efficiency across 1A–5A charge range while extending battery life via precise absorption/equalization timing and NTC-based voltage derating. |
Use Scenario: Industrial UPS providing seamless backup for security cameras and control panels during AC outage. IC Role / Device Role / Timing Role: High-reliability charger enabling automatic low-battery restart (LB pin), fast bulk recharge, and maintenance float with ±0.5% accuracy. Use Value: Ensures uninterrupted operation by detecting deeply discharged batteries and reinitiating charge without manual intervention or system reset. |
| Portable Medical Equipment | Industrial Lead-Acid Fleet Charging |
|
Use Scenario: Mobile diagnostic device with swappable 12V sealed lead-acid battery requiring safe, field-upgradable charging. IC Role / Device Role / Timing Role: Multi-chemistry charger supporting both SLA and Li-Ion packs via MODE pin configuration and NTC disable. Use Value: Eliminates need for separate chargers-single BOM supports dual battery types with programmable termination (C/10 or timer) and safety timer enforcement. |
Use Scenario: Centralized charging station for forklift or telecom backup batteries operating in ambient temperatures from –20°C to 60°C. IC Role / Device Role / Timing Role: Precision voltage-controlled charger with NTC compensation and equalization cycle for sulfation recovery. Use Value: Recovers capacity loss in aged batteries via scheduled equalization (0.379–0.758hr) and extends service life by 20–30% through temperature-adaptive float voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-chemistry battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4020IUFD#PBF | Single 60V buck charger with integrated MOSFET drivers but no MPPT or equalization mode; supports only Li-Ion/Polymer and lead-acid 2/3-stage. | Lacks MPPT, NTC compensation, and 4-stage lead-acid equalization-unsuitable for solar or long-life SLA maintenance. | Select LTC4020 for cost-sensitive, lower-current (<3A) Li-Ion applications where MPPT and equalization are unnecessary. |
| BQ24650RGER | TI 60V buck charger with MPPT and 3-stage lead-acid support, but no equalization mode, no NTC compensation, and only ±1% voltage accuracy. | Missing equalization and temperature compensation limits suitability for critical SLA maintenance in varying climates. | Choose BQ24650 for basic solar charging where budget constraints outweigh precision and battery longevity requirements. |
Compared with LTC4020IUFD#PBF and BQ24650RGER, the LTC4013EUFD#PBF uniquely combines MPPT, 4-stage lead-acid equalization, ±0.5% float accuracy, and NTC compensation-making it the only option qualified for solar-powered SLA fleet maintenance and medical-grade battery longevity assurance.
Availability
LTC4013EUFD#PBF is available at Aetrix Electronics and suitable for solar-powered systems, UPS backup units, and industrial battery charging applications requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC4013EUFD#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 LTC4013EUFD#PBF belongs to Linear's high-voltage battery charger product line, designed specifically for robust, programmable charging of lead-acid and lithium-based batteries in energy-harvesting and mission-critical backup systems.
FAQ
What battery chemistries does the LTC4013EUFD#PBF support?
The LTC4013EUFD#PBF supports lead-acid (vented and sealed), Li-Ion, Li-Polymer, and LiFePO₄ batteries. It implements configurable 2-stage (CC/CV), 3-stage (bulk/absorption/float), and 4-stage (bulk/absorption/equalization/float) charging for lead-acid, plus CC/CV with C/10 or timer termination for lithium chemistries. Mode selection is controlled by MODE1 and MODE2 pins.
How is maximum charge current set on the LTC4013EUFD#PBF?
Maximum charge current on the LTC4013EUFD#PBF is set by an external sense resistor between SENSE and BAT pins. The IC regulates the differential voltage across this resistor to 50mV in constant-current mode, so ICHGMAX = 50mV / RSENSE. For example, a 10mΩ resistor yields 5A maximum current. Overcurrent protection triggers at 100mV.
Does the LTC4013EUFD#PBF include MPPT functionality, and how does it operate?
Yes, the LTC4013EUFD#PBF includes hardware-based MPPT. Every 10.2 seconds, it pauses charging, measures the open-circuit input voltage via the FBOC pin, stores it internally as a DAC value, then regulates charge current to maintain DCIN at a user-defined percentage of that voltage. This occurs without external microcontroller intervention.
What is the purpose of the TMR pin on the LTC4013EUFD#PBF?
The TMR pin on the LTC4013EUFD#PBF connects to a capacitor to ground and sets timing for multiple functions: absorption-to-float transition (3.03hr with 0.2µF), equalization duration (0.379hr or 0.758hr depending on MODE1), and low-battery timeout (1/8 of absorption time). Grounding TMR disables all timer-based functions.
Can the LTC4013EUFD#PBF be used with NTC thermistors for temperature compensation?
Yes, the LTC4013EUFD#PBF supports NTC-based temperature compensation via the NTC pin. An external NTC/resistor divider scales the FB reference voltage with temperature using a 0.21 V/V gain and ±15mV offset. For Li-Ion applications, NTC must be disabled by connecting the pin to INTVCC, as temperature compensation is not recommended for lithium chemistries.
LTC4013EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 6
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 60V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4013EUFD#PBF FAQ
1.How can I place an order for LTC4013EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4013EUFD#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 LTC4013EUFD#PBF reliable?
The price and inventory of LTC4013EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4013EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4013EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4013EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4013EUFD#PBF?
LTC4013EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4013EUFD#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 LTC4013EUFD#PBF?
For technical support, including LTC4013EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4013EUFD#PBF requirements.
6.How does Aetrix verify that LTC4013EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4013EUFD#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 LTC4013EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4013EUFD#PBF?
All LTC4013EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4013EUFD#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 LTC4013EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4013EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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