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Analog Devices Inc. LTC4068XEDD-4.2#PBF
- Part No.:
- LTC4068XEDD-4.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4068XEDD-4.2#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:221
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Product details
Overview
LTC4068XEDD-4.2#PBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC designed for single-cell 4.2V Li-ion batteries in portable electronics. It delivers up to 950mA programmable charge current, features ±1% accurate 4.2V float voltage regulation, thermal regulation to prevent overheating, and requires no external MOSFET, sense resistor, or blocking diode. It is used in USB-powered devices such as Bluetooth headsets and MP3 players where compact size and low component count are critical.
For engineers reviewing the LTC4068XEDD-4.2#PBF datasheet, LTC4068XEDD-4.2#PBF pinout, LTC4068XEDD-4.2#PBF application, or LTC4068XEDD-4.2#PBF equivalent, key selection criteria include its DFN-8 (3mm × 3mm) package, absence of trickle charge (distinguishing it from LTC4068), programmable termination via ITERM pin, CHRG/ACPR status outputs, and thermal feedback limiting at ~120°C junction temperature.
Technical Context
The LTC4068XEDD-4.2#PBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with internal P-channel power FET (RDS(ON) = 600mΩ typ), eliminating external power components. Its thermal regulation loop dynamically reduces charge current when die temperature approaches 120°C, enabling robust operation without derating for worst-case ambient conditions.
Unlike the LTC4068 variant, the LTC4068XEDD-4.2#PBF omits the 2.9V trickle charge function-charging begins directly in constant-current mode when VBAT ≥ 2.9V. Charge termination is set by an external resistor on the ITERM pin (e.g., 825Ω yields 100mA threshold), and the PROG pin serves dual roles: programming charge current (IBAT = 1000 × VPROG/RPROG) and monitoring real-time current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2V float voltage with ±1% accuracy over –40°C to 85°C - ensures safe full-charge state for standard Li-ion cells without calibration. |
| Max Charge Current | Up to 950mA (with proper PCB thermal layout) - supports fast charging of 1000–2000mAh batteries in under 2 hours. |
| Input Voltage Range | 4.25V to 6.5V - compatible with USB 2.0 (5V±5%) and common wall adapters. |
| Thermal Regulation Threshold | Junction temperature limit ~120°C - automatically scales back current to prevent thermal shutdown or damage. |
| Termination Accuracy | ITERM threshold ±10% (e.g., 100mA ±10mA with RTERM = 825Ω) - enables precise C/10 or C/5 cutoff for optimal capacity and cycle life. |
| Quiescent Current (Standby) | 200–500µA - minimizes battery drain during idle periods between charge cycles. |
| Package | 8-lead DFN (3mm × 3mm × 0.75mm) with exposed ground pad - requires soldering of exposed pad for θJA = 40°C/W thermal performance. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 3mm), exposed pad (Pin 9) is GND and must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge termination current threshold input | Connects to ground via precision resistor (e.g., 825Ω) to set termination current; internal comparator triggers at 100mV. |
| BAT (2) | Battery connection and charge current output | Drives battery directly via internal P-FET; regulates float voltage to 4.2V; disconnects in shutdown to limit battery drain to <2µA. |
| CHRG (3) | Open-drain charge status indicator | Pulled low during active charging; high-impedance when charge terminates or device is disabled - drives LED or microcontroller input. |
| GND (4, 9) | Ground reference and thermal pad | Pins 4 and 9 are electrically connected; Pin 9 is exposed metal pad - mandatory soldering required for thermal management and noise immunity. |
| EN (8) | Enable/disable control input | Logic high disables charging (IBAT < 2µA); internal 2MΩ pull-down allows floating to enable - supports system-level power sequencing. |
| ACPR (7) | Open-drain AC present indicator | Pulled low when VCC > UVLO threshold (3.8V) and VCC > VBAT + 100mV - confirms valid input supply capable of charging. |
| VCC (6) | Positive input supply voltage | Accepts 4.25–6.5V; bypass with ≥1µF capacitor; powers internal circuitry and FET gate drive. |
| PROG (5) | Charge current programming and monitoring | 1V servo point in CC mode; IBAT = 1000 × VPROG/RPROG; clamped at ~2.4V to prevent overstress. |
Key Features
| Feature | Design Value |
|---|---|
| No external power components | Integrated P-channel MOSFET eliminates need for external FET, sense resistor, or blocking diode - reduces BOM count and board area. |
| USB-compliant input operation | Operates within USB 2.0 power limits (5V, ≤500mA) without external current limiting - simplifies design for portable USB-charged devices. |
| Thermal regulation with automatic current scaling | Dynamically reduces charge current above ~120°C junction temperature - enables maximum safe charge rate without heatsinks or airflow. |
| Programmable charge termination | External RTERM sets termination threshold from ~20mA to 110mA - supports flexible cutoff strategies (C/10, C/5) for different cell chemistries or aging profiles. |
| Dual status outputs (CHRG/ACPR) | Separate open-drain pins indicate charging activity and valid input supply presence - enables intuitive user feedback and system power management. |
| Soft-start and undervoltage lockout | 100µs current ramp limits inrush; UVLO (3.8V threshold, 200mV hysteresis) prevents operation below safe input voltage - improves reliability during brownouts. |
Applications
| Bluetooth Headset Charging | USB-Powered Portable Speaker |
|---|---|
|
Use Scenario: Compact wearable audio device with integrated 300–500mAh Li-ion battery charged exclusively via micro-USB port. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, terminating at C/10, and signaling charge status to host MCU via CHRG pin. Use Value: Eliminates need for external FET or sense resistor, reducing solution size to <10mm² while maintaining ±1% voltage accuracy and thermal safety. |
Use Scenario: Battery-powered speaker drawing system load during charging, requiring stable 4.2V rail and simultaneous charge/load operation. IC Role / Device Role / Timing Role: Provides regulated 4.2V float voltage and monitors battery current via PROG pin to support gas gauging and dynamic load management. Use Value: Enables accurate state-of-charge estimation using real-time IBAT = 1000 × VPROG/RPROG, without additional current-sense IC or shunt resistor. |
| MP3 Player Power Management | Medical Wearable Sensor |
|
Use Scenario: Handheld media player with 800mAh Li-ion battery, requiring automatic recharge when voltage drops below 4.1V after partial discharge. IC Role / Device Role / Timing Role: Implements automatic recharge threshold (ΔV = 100mV below float) and maintains <2µA battery drain in shutdown mode. Use Value: Extends shelf life and eliminates manual reinitiation - device remains ready for use after weeks of storage without battery deep discharge. |
Use Scenario: Low-power clinical sensor worn continuously, powered by 200mAh Li-ion cell, requiring ultra-low quiescent current and reliable USB recharging in clinic settings. IC Role / Device Role / Timing Role: Delivers precise 4.2V charging with 200–500µA standby current and EN-controlled shutdown for system-level power gating. Use Value: Reduces average system power consumption during idle periods, extending operational time between charges without compromising safety or accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone linear Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054EDD-4.2#PBF | Same DFN-8 package; includes C/10 termination only (no ITERM pin); lacks ACPR output and programmable termination. | Suitable for cost-sensitive designs where fixed C/10 cutoff suffices and AC presence indication is unnecessary. | Choose LTC4054EDD-4.2#PBF if termination flexibility and status signaling are not required - lower BOM complexity but less configurability. |
| LTC4058XEDD-4.2#PBF | Supports Kelvin sensing for higher voltage accuracy (±0.5%); adds dedicated ICHRG monitor pin; same no-trickle architecture. | Targeted at high-accuracy medical or industrial applications where float voltage tolerance is tighter than ±1%. | Choose LTC4058XEDD-4.2#PBF when enhanced voltage regulation and separate current monitoring are needed - trades marginally larger footprint for metrology-grade performance. |
Compared with LTC4054EDD-4.2#PBF, the LTC4068XEDD-4.2#PBF offers programmable termination and dual status outputs; compared with LTC4058XEDD-4.2#PBF, it provides identical no-trickle functionality at lower cost and simpler layout, making it optimal for consumer USB-charged devices requiring flexibility without metrology-grade specs.
Availability
LTC4068XEDD-4.2#PBF is available at Aetrix Electronics and suitable for Bluetooth headsets, USB-powered portable speakers, MP3 players, medical wearables, and other portable Li-ion battery applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for LTC4068XEDD-4.2#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4068X series belongs to Linear Technology's precision battery management IC portfolio, engineered specifically for space-constrained, USB-compatible portable electronics requiring minimal external components and robust thermal management.
FAQ
What is the key functional difference between LTC4068XEDD-4.2#PBF and LTC4068EDD-4.2#PBF?
The LTC4068XEDD-4.2#PBF omits the 2.9V trickle charge feature present in the LTC4068EDD-4.2#PBF. When battery voltage is below 2.9V, the LTC4068XEDD-4.2#PBF does not initiate pre-charge - it waits until VBAT ≥ 2.9V before entering constant-current mode. This simplifies charging logic for applications where deeply discharged batteries are rare or managed externally.
How is charge current programmed on the LTC4068XEDD-4.2#PBF?
Charge current is set by connecting a precision 1% resistor (RPROG) from the PROG pin to ground. The relationship is IBAT = 1000 × VPROG/RPROG, where VPROG is regulated to 1.0V in constant-current mode. For example, RPROG = 1.65kΩ yields ~606mA; RPROG = 1.25kΩ yields ~800mA. The PROG pin voltage can also be monitored to derive real-time charge current.
Does the LTC4068XEDD-4.2#PBF require an external blocking diode?
No, the LTC4068XEDD-4.2#PBF does not require an external blocking diode. Its internal P-channel MOSFET architecture prevents reverse current flow from battery to input, eliminating conduction loss and board space typically needed for discrete diodes or FETs in linear charger designs.
What thermal design considerations apply to the LTC4068XEDD-4.2#PBF?
The exposed pad (Pin 9) of the LTC4068XEDD-4.2#PBF must be soldered to a PCB ground plane to achieve θJA = 40°C/W. Without this connection, thermal resistance increases significantly, causing premature thermal regulation and reduced charge current. A 2500mm² double-sided 1oz copper area is recommended for full 950mA capability at room temperature.
Can the LTC4068XEDD-4.2#PBF operate from a 5V USB source without additional circuitry?
Yes, the LTC4068XEDD-4.2#PBF is explicitly designed for direct USB 2.0 operation. Its 4.25–6.5V input range, ≤500µA quiescent current in standby, and built-in undervoltage lockout (3.8V threshold) ensure compatibility with standard USB ports. No external regulators, current limiters, or protection FETs are required for basic USB charging functionality.
LTC4068XEDD-4.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC4068XEDD-4.2#PBF FAQ
1.How can I place an order for LTC4068XEDD-4.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4068XEDD-4.2#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 LTC4068XEDD-4.2#PBF reliable?
The price and inventory of LTC4068XEDD-4.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4068XEDD-4.2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4068XEDD-4.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4068XEDD-4.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4068XEDD-4.2#PBF?
LTC4068XEDD-4.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4068XEDD-4.2#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 LTC4068XEDD-4.2#PBF?
For technical support, including LTC4068XEDD-4.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4068XEDD-4.2#PBF requirements.
6.How does Aetrix verify that LTC4068XEDD-4.2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4068XEDD-4.2#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 LTC4068XEDD-4.2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4068XEDD-4.2#PBF?
All LTC4068XEDD-4.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4068XEDD-4.2#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 LTC4068XEDD-4.2#PBF part is unused and in its original packaging.
Return procedure for LTC4068XEDD-4.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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