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Analog Devices Inc. LTC4079EDD#PBF
- Part No.:
- LTC4079EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4079EDD#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,662
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Product details
Overview
LTC4079EDD#PBF from Analog Devices is a 60V, 250mA linear battery charger IC supporting Li-Ion/Polymer, LiFePO₄, Lead-Acid, and NiMH chemistries. It delivers ±0.5% CV regulation accuracy, 4µA input quiescent current during charging, <0.01µA battery drain in shutdown, and thermal regulation at 118°C - enabling reliable backup power and energy harvesting applications with high-impedance sources.
For engineers reviewing the LTC4079EDD#PBF datasheet, LTC4079EDD#PBF pinout, LTC4079EDD#PBF application, or LTC4079EDD#PBF equivalent, key selection considerations include its adjustable 10–250mA charge current via PROG resistor, 1.2–60V programmable battery voltage via FB/FBG divider, input voltage regulation for solar/weak-source operation, NTC-based temperature qualified charging, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC4079EDD#PBF implements dual-loop CC/CV regulation with integrated power FET, current sensing, and reverse-current protection. Its EN pin enables precise input voltage regulation (via external resistor divider), while differential VIN–VBAT regulation maintains ≥160mV headroom to prevent source collapse - critical for energy harvesting.
Thermal regulation actively reduces charge current above 118°C junction temperature, and the timer-based (CTIMER) or C/10 current-based termination ensures safe, full-charge completion. Battery voltage feedback uses sampled 3-second FB monitoring with FBG-switched ground reference to achieve <0.01µA standby drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V - supports wide-range sources including solar panels, automotive batteries, and industrial rails. |
| Charge Current Range | 10mA to 250mA - set by single external PROG resistor (RPROG = 297.5V / ICHG). |
| Battery Voltage Range | 1.2V to 60V - programmable via FB/FBG resistor divider with ±0.5% regulation accuracy. |
| Input Quiescent Current | 4µA during charging - minimizes source power loss in energy-constrained systems. |
| Battery Drain (Shutdown) | <0.01µA - enables multi-year backup battery life without measurable self-discharge. |
| Thermal Regulation Threshold | 118°C - dynamically scales charge current to prevent overheating without external thermal management. |
| NTC Temperature Monitoring | Sampled every 3 seconds - pauses charging outside user-defined hot/cold thresholds (e.g., 0°C–40°C for Vishay Curve 2). |
Pinout & Package
Package: 10-lead (3mm × 3mm) DFN with exposed pad (Pin 11 = GND), θJA = 43°C/W, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (1) | Input supply input | Accepts 2.7V–60V; bypassed with ≥1µF ceramic capacitor; powers internal circuitry and charge path. |
| EN (2) | Enable and input regulation control | Rising threshold = 1.190V; used for enable/disable and adjustable VIN regulation via external divider. |
| PROG (3) | Charge current programming | Servos to 1.190V; sets ICHG = 250 × IPROG; RPROG defines full-scale current (e.g., 3kΩ = 99mA). |
| NTCBIAS (4) | NTC bias voltage source | Provides pulsed 4V bias (3s period, 210µs width) to NTC thermistor network for low-power temperature sensing. |
| NTC (5) | Battery temperature sense input | Monitors NTC voltage ratio vs NTCBIAS; detects out-of-range temps (e.g., <0°C or >40°C) and pauses charging. |
| TIMER (6) | Charge safety timer capacitor | CTIMER = tTIMER × 18.2nF/hr (e.g., 100nF = 5.5 hr); grounded to enable C/10 termination only. |
| CHRG (7) | Open-drain charge status output | Pulled low during active charging (>C/10); high-impedance when terminated or in standby. |
| FBG (8) | Feedback ground switch | Internally connects FB divider to GND only during sampling (210µs every 3s) to minimize battery drain. |
| FB (9) | Battery voltage sense input | Servos to 1.170V in CV mode; determines VCHG = 1.170V × (1 + RFB1/(RFB2 + 160Ω)). |
| BAT (10) | Battery charge output | Delivers regulated CC/CV current to battery; includes integrated FET, current sense, and reverse-current protection. |
| GND (11) | Ground reference and thermal pad | Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal performance (θJA = 43°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation | Adjustable via EN pin divider - maintains optimal source voltage (e.g., solar MPPT) without external controllers. |
| Differential VIN–VBAT regulation | Activates at 160mV ΔV - prevents input collapse from weak sources like thin-film or supercapacitor banks. |
| Ultralow battery drain in standby | <0.01µA - achieved via pulsed FBG switching and 3-second FB sampling, enabling decade-long backup operation. |
| Temperature-qualified charging | NTC-based cold/hot fault detection with user-adjustable thresholds - protects battery health across automotive and industrial environments. |
| AEC-Q100 qualification | Rated for –40°C to +125°C - validated for automotive backup, telematics, and ADAS auxiliary power systems. |
Applications
| Backup Power Supply | Energy Harvesting System |
|---|---|
Use Scenario: Maintaining real-time clock (RTC), SRAM, or microcontroller state during main power failure in industrial PLCs or automotive ECUs. IC Role / Device Role / Timing Role: Linear charger managing LiFePO₄ or supercapacitor backup bank with zero-maintenance, decade-long hold-up capability. Use Value: Eliminates need for manual battery replacement; <0.01µA drain extends 100mAh backup battery life beyond 10 years. |
Use Scenario: Charging a thin-film battery from intermittent solar, thermal, or RF energy harvesters in wireless sensor nodes. IC Role / Device Role / Timing Role: High-impedance source optimizer using input voltage regulation and ultralow IQ to maximize energy capture from µW–mW sources. Use Value: Enables operation with <2.7V start-up and 4µA operating IQ - captures energy even under low-light or low-delta-T conditions. |
| Automotive Auxiliary Battery | Lead-Acid Maintenance Charger |
Use Scenario: Charging a secondary 12V LiFePO₄ battery from vehicle's primary 12V rail to power infotainment or ADAS modules during engine-off periods. IC Role / Device Role / Timing Role: AEC-Q100-compliant charger with thermal regulation and NTC monitoring for under-hood deployment. Use Value: Prevents overtemperature shutdown in hot engine bays; maintains battery within 0°C–40°C safe charging window. |
Use Scenario: Float/maintenance charging of 24V or 48V lead-acid batteries in telecom cabinets or UPS systems with variable input voltage. IC Role / Device Role / Timing Role: Adjustable CV voltage (up to 60V) and C/10 + timer termination ensure optimal absorption and float stages without gassing. Use Value: Programmable 1.2–60V CV range supports 2S–12S lead-acid stacks; ±0.5% regulation preserves battery cycle life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17710 | Lower max input (20V), lower max charge current (50mA), integrated 100mA LDO; no NTC input or AEC-Q100 rating. | Targeted at ultra-low-power IoT sensors with coin-cell or micro-energy harvesters - not suitable for 60V or automotive use. | Select MAX17710 only for sub-20V, sub-50mA applications where integrated LDO simplifies power tree; avoid for high-voltage or automotive designs. |
| BQ24650 | Higher IQ (250µA), no input voltage regulation, no NTC interface, wider package options (HTSSOP-20), but lacks thermal regulation and AEC-Q100. | Designed for industrial AC/DC adapter-powered chargers - relies on external thermal management and fixed-input operation. | Choose BQ24650 for cost-sensitive, non-automotive 12–28V systems with stable input; avoid where ultralow IQ, solar regulation, or automotive qualification is required. |
Compared with MAX17710 and BQ24650, the LTC4079EDD#PBF uniquely combines 60V input tolerance, 4µA IQ, input/differential voltage regulation, AEC-Q100 qualification, and integrated thermal regulation - making it the only option for robust, maintenance-free backup and energy harvesting in harsh or wide-input environments.
Availability
LTC4079EDD#PBF is available at Aetrix Electronics and suitable for backup power supplies, energy harvesting systems, and automotive auxiliary battery charging requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC4079EDD#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC4079EDD#PBF belongs to Analog Devices' precision battery management IC product line, designed specifically for high-voltage, ultralow-quiescent-current charging in energy-constrained and automotive-critical applications.
FAQ
What battery chemistries does the LTC4079EDD#PBF support?
The LTC4079EDD#PBF supports Li-Ion/Polymer, LiFePO₄, Lead-Acid, and NiMH battery stacks up to 60V. Its programmable constant-voltage (1.2–60V) and constant-current (10–250mA) profiles allow configuration for each chemistry's specific charge algorithm - including temperature-qualified charging via NTC input for safe Li-based operation.
How is the charge current set on the LTC4079EDD#PBF?
The LTC4079EDD#PBF charge current is set using an external resistor (RPROG) from the PROG pin to ground, calculated as RPROG = 297.5V / ICHG. For example, a 3kΩ resistor sets ~99mA charge current. The PROG pin regulates to 1.190V during constant-current mode, and the instantaneous battery current can be monitored as IBAT = 250 × VPROG / RPROG.
Does the LTC4079EDD#PBF support automatic recharge?
Yes, the LTC4079EDD#PBF supports automatic recharge: when the battery voltage drops below 97.6% of the programmed charge voltage (VRECHRG), the device re-engages charging. This occurs after sampling the FB pin every 3 seconds in standby mode, with negligible battery drain (<0.01µA) due to pulsed FBG grounding and short sampling windows.
What is the purpose of the TIMER pin on the LTC4079EDD#PBF?
The TIMER pin on the LTC4079EDD#PBF accepts an external capacitor to set the maximum charge duration. With CTIMER = tTIMER × 18.2nF/hr (e.g., 100nF = 5.5 hours), it enables timer-based termination. Grounding the TIMER pin disables the timer and activates C/10 current-based termination instead - providing flexible, application-specific safety cutoffs.
Is the LTC4079EDD#PBF qualified for automotive applications?
Yes, the LTC4079EDD#PBF is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C). It features NTC-based temperature monitoring, thermal regulation at 118°C, and robust input voltage regulation - making it suitable for under-hood backup power, telematics, and ADAS auxiliary battery charging where reliability and extended temperature operation are critical.
LTC4079EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- 250mA
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 60V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4079EDD#PBF FAQ
1.How can I place an order for LTC4079EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4079EDD#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 LTC4079EDD#PBF reliable?
The price and inventory of LTC4079EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4079EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4079EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4079EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4079EDD#PBF?
LTC4079EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4079EDD#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 LTC4079EDD#PBF?
For technical support, including LTC4079EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4079EDD#PBF requirements.
6.How does Aetrix verify that LTC4079EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4079EDD#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 LTC4079EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4079EDD#PBF?
All LTC4079EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4079EDD#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 LTC4079EDD#PBF part is unused and in its original packaging.
Return procedure for LTC4079EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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