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Analog Devices Inc. LTC4068EDD-4.2#TRPBF
- Part No.:
- LTC4068EDD-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4068EDD-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LTC4068EDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear Li-ion battery charger IC with integrated P-channel MOSFET, programmable charge current up to 950mA, ±1% 4.2V float voltage accuracy, and thermal regulation for safe high-current charging in portable devices such as Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4068EDD-4.2#TRPBF datasheet, LTC4068EDD-4.2#TRPBF pinout, LTC4068EDD-4.2#TRPBF application, or LTC4068EDD-4.2#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world thermal behavior, USB-compliant input operation, and validated alternative parts for single-cell Li-ion charging designs.
Technical Context
The LTC4068EDD-4.2#TRPBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with internal thermal feedback limiting charge current when die temperature approaches 120°C. It requires no external sense resistor, blocking diode, or MOSFET - all power path control is integrated.
Charge termination is programmable via external RTERM, with default C/10 threshold (e.g., 95mA for 950mA ICHG). Trickle charge activates below 2.9V battery voltage (LTC4068 variant only), and automatic recharge triggers at ~4.10V (VFLOAT – 100mV). The PROG pin serves dual role: programming current (1V reference) and real-time current monitoring (IBAT = VPROG/RPROG × 1000).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2V ±1% float voltage - ensures safe full-charge state for standard Li-ion cells without overvoltage risk. |
| Max Charge Current | Up to 950mA (with proper PCB thermal layout) - enables fast charging of 1000–2000mAh batteries in <3 hours. |
| Input Voltage Range | 4.25V to 6.5V - supports direct USB 5V and common wall adapters without external regulation. |
| Thermal Regulation Threshold | Junction temperature limit ≈120°C - dynamically reduces charge current to prevent overheating under high ambient or poor heatsinking. |
| Trickle Charge Threshold | 2.9V ±0.1V (rising) with 80mV hysteresis - safely recovers deeply discharged cells before full-current CC mode. |
| Termination Accuracy | ITERM = VTERM/RTERM × 100; typical ±10% tolerance - provides reliable end-of-charge detection without software intervention. |
| Shutdown Current | <2µA battery drain when VCC removed or EN high - preserves battery capacity during storage or standby. |
Pinout & Package
Package: 8-lead 3mm × 3mm × 0.75mm DFN with exposed thermal pad (Pin 9 = GND), requiring soldering to PCB ground plane for θJA = 40°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge termination current setting | Connects to ground via RTERM to program termination threshold (e.g., 95mA for 950mA ICHG); internal comparator filters transients with 1ms delay. |
| BAT (2) | Battery connection and voltage regulation output | Drives battery directly via internal P-MOSFET; precision divider sets 4.2V float; disconnects in shutdown to minimize leakage (<2µA). |
| CHRG (3) | Open-drain charge status indicator | Pulled low during active charging; high-impedance when terminated or disabled - drives LED without external transistor. |
| GND (4,9) | Power and thermal reference ground | Pins 4 and 9 (exposed pad) are electrically connected; pad must be soldered to PCB ground for thermal management and noise immunity. |
| EN (8) | Enable/disable control input | Logic high forces shutdown (<50µA supply current); floating or logic low enables charging via internal 2MΩ pull-down. |
| ACPR (7) | Input power presence indicator | Pulled low when VCC > UVLO (3.8V) and VCC − VBAT > 100mV - confirms valid input source capable of charging. |
| VCC (6) | Main input supply | Accepts 4.25–6.5V; bypassed with ≥1µF capacitor; powers internal circuitry and battery charging path. |
| PROG (5) | Charge current programming & monitoring | Serves as 1V reference node for RPROG; VPROG directly indicates IBAT (IBAT = VPROG/RPROG × 1000) for gas gauging or diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| No external power components | Integrated P-MOSFET eliminates need for external FET, sense resistor, or blocking diode - reduces BOM count to just two resistors and one input cap. |
| USB-compliant operation | Operates within USB 5V/500mA limits; supports dynamic current scaling (e.g., 500mA on USB, 800mA on wall adapter) using external MOSFET switching. |
| Real-time current monitoring | PROG pin voltage linearly tracks charge current (1V = full-scale), enabling analog gas gauging without ADC or additional sensing circuitry. |
| Soft-start protection | 100µs controlled ramp-up of charge current minimizes inrush stress on input supply and prevents voltage droop during startup. |
| Automatic recharge & low-leakage standby | Recharges when battery drops to ~4.10V; draws <2µA from battery in standby - maintains charge level without user intervention or external wake-up circuitry. |
Applications
| Bluetooth Headset Charging | Portable Medical Sensor |
|---|---|
Use Scenario: Compact wearable device with 300mAh Li-ion battery powered by micro-USB port. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, trickle recovery, and automatic top-off without host MCU involvement. Use Value: Enables <2-hour full charge from USB while maintaining <2µA battery drain during idle - critical for multi-day wearable runtime. |
Use Scenario: Battery-powered glucose monitor requiring reliable, low-noise charging in clinical environments. IC Role / Device Role / Timing Role: Primary charging controller with ±1% voltage accuracy and thermal foldback to prevent battery damage during extended use. Use Value: Eliminates risk of overvoltage-induced cell degradation; thermal regulation allows continuous charging even at 40°C ambient without derating. |
| Wireless Earbud Case | Industrial Handheld Scanner |
Use Scenario: Dual-bay charging case supporting simultaneous charging of two 150mAh earbuds via single USB input. IC Role / Device Role / Timing Role: Single-chip solution providing independent charge control per bay with CHRG/ACPR status outputs for UI feedback. Use Value: Reduces PCB area by 40% vs discrete solutions; PROG pin monitoring enables precise battery health tracking across multiple cells. |
Use Scenario: Rugged handheld scanner with 1200mAh Li-ion battery used in warehouses with variable ambient temperatures (−20°C to 60°C). IC Role / Device Role / Timing Role: Robust charging interface tolerant of voltage transients and thermal cycling, with UVLO hysteresis preventing false shutdowns. Use Value: Maintains charging functionality across full industrial temperature range; 200mV UVLO hysteresis avoids oscillation near 3.8V input dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion linear charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054ES5-4.2#TRMPBF | ThinSOT-5 package (2.8mm × 1.7mm); max 800mA charge current; no trickle charge; no ITERM pin - uses fixed C/10 termination. | Targeted at ultra-compact space-constrained designs where DFN footprint is prohibitive; lacks programmable termination and battery voltage monitoring capability. | Select when board area is primary constraint and fixed termination suffices; avoid if battery health monitoring or deep-discharge recovery is required. |
| LTC4058EDD-4.2#TRPBF | DFN-8 package like LTC4068EDD-4.2#TRPBF but adds Kelvin sense for improved voltage accuracy (±0.5%); supports C/10 termination only; no ITERM pin. | Used where higher float voltage precision is critical (e.g., medical or aerospace), but sacrifices programmable termination and trickle charge flexibility. | Choose for applications demanding tighter voltage regulation; not suitable as drop-in replacement due to missing ITERM functionality and different termination architecture. |
Compared with LTC4068EDD-4.2#TRPBF, LTC4054ES5-4.2#TRMPBF trades programmability and thermal robustness for minimal size, while LTC4058EDD-4.2#TRPBF prioritizes voltage accuracy over termination flexibility - making LTC4068EDD-4.2#TRPBF the optimal balance of configurability, integration, and reliability for mainstream portable electronics.
Availability
LTC4068EDD-4.2#TRPBF is available at Aetrix Electronics and suitable for Bluetooth headsets, portable medical sensors, wireless earbud cases, industrial handheld scanners, and USB-powered consumer electronics requiring stable component supply and long-term production continuity.
Supply support for LTC4068EDD-4.2#TRPBF 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 LTC4068 product line was designed specifically for cost-sensitive, space-constrained portable Li-ion charging applications requiring zero external power components, USB compatibility, and autonomous operation - targeting consumer electronics and wearables.
FAQ
What is the maximum charge current supported by the LTC4068EDD-4.2#TRPBF?
The LTC4068EDD-4.2#TRPBF supports up to 950mA charge current when implemented with optimal PCB thermal design (exposed pad soldered to ≥2500mm² copper area and θJA ≤ 40°C/W). At room temperature with 5V input and 3.3V battery, it delivers full-scale current; thermal regulation automatically reduces current above ~52°C ambient to maintain safe junction temperature.
Does the LTC4068EDD-4.2#TRPBF support USB 2.0 power delivery compliance?
Yes, the LTC4068EDD-4.2#TRPBF operates within USB 2.0 specifications: it accepts 4.25V–6.5V input, draws ≤500µA quiescent current in standby, and supports programmable current limiting (e.g., 500mA for USB ports, 800mA for wall adapters) using external circuitry. Its built-in soft-start and UVLO hysteresis ensure robust behavior during USB hot-plug events.
How does the trickle charge function work on the LTC4068EDD-4.2#TRPBF?
The LTC4068EDD-4.2#TRPBF initiates trickle charge when BAT voltage falls below 2.9V (±0.1V), delivering ~1/10th the programmed full current to safely recover deeply discharged cells. This mode disables once BAT exceeds 2.9V, transitioning to constant-current mode. Note: The LTC4068X variant omits this feature entirely - only the LTC4068 (not X) supports trickle charge.
Can the LTC4068EDD-4.2#TRPBF be used without an external RTERM resistor?
Yes - shorting the ITERM pin to the PROG pin configures automatic C/10 termination (ITERM = ICHG/10), eliminating RTERM. In this mode, charge current is set by RPROG using ICHG = 500V/RPROG, and termination occurs when current drops to 10% of that value. This simplifies design but removes independent control of termination threshold.
What thermal design practices are required for reliable operation of the LTC4068EDD-4.2#TRPBF?
Reliable operation requires soldering the exposed thermal pad (Pin 9) to a minimum 2500mm² double-sided 1oz copper ground plane. Without this, θJA degrades significantly (>100°C/W), causing premature thermal limiting. With proper layout, the LTC4068EDD-4.2#TRPBF sustains 800mA+ at 25°C ambient; thermal feedback smoothly reduces current as ambient rises, protecting both IC and battery.
LTC4068EDD-4.2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- 950mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC4068EDD-4.2#TRPBF FAQ
1.How can I place an order for LTC4068EDD-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4068EDD-4.2#TRPBF 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 LTC4068EDD-4.2#TRPBF reliable?
The price and inventory of LTC4068EDD-4.2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4068EDD-4.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4068EDD-4.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4068EDD-4.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4068EDD-4.2#TRPBF?
LTC4068EDD-4.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4068EDD-4.2#TRPBF 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 LTC4068EDD-4.2#TRPBF?
For technical support, including LTC4068EDD-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4068EDD-4.2#TRPBF requirements.
6.How does Aetrix verify that LTC4068EDD-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4068EDD-4.2#TRPBF 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 LTC4068EDD-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4068EDD-4.2#TRPBF?
All LTC4068EDD-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4068EDD-4.2#TRPBF, 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 LTC4068EDD-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4068EDD-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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