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Analog Devices Inc. LTC4068XEDD-4.2#TRPBF
- Part No.:
- LTC4068XEDD-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4068XEDD-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
LTC4068XEDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC with programmable charge current up to 950 mA, fixed 4.2 V ±1% float voltage, and no external MOSFET, sense resistor, or blocking diode required. It integrates thermal regulation, automatic recharge, charge status (CHRG), and AC present (ACPR) outputs, and is optimized for USB-powered portable devices such as Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4068XEDD-4.2#TRPBF datasheet, LTC4068XEDD-4.2#TRPBF pinout, LTC4068XEDD-4.2#TRPBF application, or LTC4068XEDD-4.2#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world thermal behavior under load, C/10 termination implementation, and validated alternatives for single-cell Li-ion charging designs requiring low external component count and DFN footprint efficiency.
Technical Context
The LTC4068XEDD-4.2#TRPBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with internal P-channel power FET (RDS(ON) = 600 mΩ typ), precision 4.2 V reference (±1% over –40°C to 85°C), and thermal feedback limiting junction temperature to ~120°C. It operates from 4.25 V to 6.5 V input and supports USB-compliant 500 mA charging without external components beyond RPROG and RTERM.
Unlike the LTC4068-4.2, the "X" variant omits trickle charge (no 2.9 V threshold or ITRIKL), simplifying design for batteries pre-conditioned above 3.0 V. Charge termination is programmable via ITERM pin using RTERM, with typical filter time tTERM = 1 ms to reject transient load noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2 V ±1% - ensures safe full-charge state for standard Li-ion cells without external voltage-setting components. |
| Max Charge Current | Up to 950 mA - set by 1% RPROG (e.g., 1.05 kΩ → 950 mA); enables fast charging in compact DFN package with thermal regulation. |
| Termination Threshold | Programmable down to 20 mA (RTERM = 5 kΩ) - supports C/10 or custom cutoffs for gas gauging or low-capacity cells. |
| Input Voltage Range | 4.25 V to 6.5 V - compatible with USB 2.0 (5 V ±5%) and common wall adapters; includes 3.8 V UVLO with 200 mV hysteresis. |
| Quiescent Current | 200–500 µA in standby - minimizes battery drain when charging is complete; drops to <2 µA in shutdown mode. |
| Thermal Regulation | Active at ~120°C junction - dynamically reduces charge current to prevent overheating on PCBs with θJA = 40°C/W (exposed pad soldered). |
| Package | 8-lead 3 mm × 3 mm × 0.75 mm DFN - surface-mount footprint with exposed ground pad (Pin 9) essential for thermal performance. |
Pinout & Package
8-lead plastic DFN (3 mm × 3 mm), exposed thermal pad (Pin 9) must be soldered to PCB ground for thermal management (θJA = 40°C/W). Package height is 0.75 mm max; JEDEC MO-229 variation (DD8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge termination threshold input | Accepts 1% RTERM to ground; sets ITERM = 100 mV / RTERM; disables trickle charge in LTC4068X variant. |
| BAT (2) | Battery connection node | Delivers regulated CC/CV charge current; internal precision divider sets 4.2 V float; disconnects in shutdown to limit battery drain to <2 µA. |
| CHRG (3) | Open-drain charge status output | Pulled low during active charge; high-impedance when terminated or in shutdown - drives LED or microcontroller interrupt. |
| GND (4, 9) | Ground reference and thermal pad | Pins 4 and 9 are electrically common; Pin 9 exposed pad must be soldered to PCB ground plane for thermal conduction and EMI control. |
| EN (8) | Enable/disable control input | Logic high forces shutdown (<50 µA ICC, <2 µA IBAT); floating or logic low enables charging via internal 2 MΩ pull-down. |
| ACPR (7) | Open-drain AC present indicator | Pulled low when VCC > UVLO threshold (3.8 V) and VCC – VBAT > 100 mV - signals valid input supply capable of charging. |
| VCC (6) | Positive input supply | Accepts 4.25–6.5 V; requires ≥1 µF bypass capacitor; powers internal circuitry and FET gate drive. |
| PROG (5) | Charge current programming & monitor | 1 V servo point in CC mode; IBAT = 1000 × VPROG/RPROG; clamped at ~2.4 V to prevent damage from overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| No external power FET or sense resistor | Reduces BOM count to two passive components (RPROG, RTERM) and eliminates layout sensitivity to trace resistance or FET selection. |
| Thermal regulation at ~120°C | Automatically throttles charge current under high ambient or poor PCB thermal design - avoids thermal runaway without external sensors or control loops. |
| USB-compatible input range | Operates directly from 5 V USB ports without LDO or boost conversion - supports portable device certification with minimal power loss. |
| Automatic recharge at 4.10 V | Reinitiates full charge when battery voltage drops ~100 mV below float voltage - maintains battery at ≥90% SOC without host MCU intervention. |
| Soft-start (100 µs ramp) | Prevents inrush current spikes into input supply or battery during charge initiation - eliminates need for input current limiting or large bulk capacitance. |
Applications
| Portable Audio Devices | Bluetooth Headsets |
|---|---|
|
Use Scenario: Compact wireless earbuds requiring rapid recharge from USB-C power banks with strict thermal envelope limits. IC Role / Device Role / Timing Role: Standalone CC/CV charger managing full Li-ion cycle without host processor involvement; CHRG and ACPR provide status to system MCU. Use Value: 950 mA max current enables <3-hour full charge; DFN package fits sub-10 cm² PCB area; thermal regulation prevents case temperature rise above 45°C. |
Use Scenario: Dual-mode headset supporting both USB and Qi wireless charging (via companion DC-DC), where wired input must coexist without cross-interference. IC Role / Device Role / Timing Role: Primary linear charger for battery; EN pin allows host to disable charging during wireless mode to avoid conflict; ACPR confirms valid input before enabling system power rails. Use Value: No-trickle architecture avoids over-stressing aged cells; 2 µA shutdown current extends shelf life; PROG pin monitoring enables firmware-based charge current adaptation. |
| Medical Wearables | Industrial Handheld Scanners |
|
Use Scenario: FDA-class II wearable glucose monitor with 24/7 operation, requiring reliable charge termination and zero false recharges due to sensor load transients. IC Role / Device Role / Timing Role: Battery management unit ensuring precise 4.2 V float and C/10 termination; tTERM = 1 ms filtering rejects ECG amplifier switching noise from triggering premature cutoff. Use Value: ±1% voltage accuracy meets IEC 62304 safety-critical tolerance; 200 µA standby current preserves battery for >72 hours in alarm-sleep mode. |
Use Scenario: Ruggedized barcode scanner used in warehouses with wide ambient temperature swings (–20°C to 60°C) and frequent hot-swap battery replacement. IC Role / Device Role / Timing Role: Robust charging interface tolerant of repeated VCC transients during battery swaps; UVLO hysteresis prevents oscillation during marginal input conditions. Use Value: Thermal regulation sustains 600 mA charge at 55°C ambient; exposed pad soldering ensures reliability across 10,000+ thermal cycles; EN pin enables firmware-controlled charge enable/disable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone linear Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054ES5-4.2#TRMPBF | ThinSOT-5 package (2.8 mm × 2.9 mm), max 800 mA, includes C/10 termination but no ACPR output; lacks ITERM pin - termination fixed at 10% of programmed current. | Preferred for ultra-thin wearables where height < 1.1 mm is critical; unsuitable when independent AC presence detection or adjustable termination is required. | Select LTC4054 if board space is constrained vertically and fixed C/10 is acceptable; avoid when system-level power sequencing depends on ACPR signal. |
| LTC4058EDD-4.2#TRPBF | DFN-8 same footprint, adds Kelvin sense (BAT/BS pins) for ±0.5% voltage accuracy and supports up to 950 mA; includes charge current monitor (IMON) pin with analog output. | Used where battery pack impedance causes voltage drop between charger and cell; required for medical or industrial apps demanding tighter voltage regulation than ±1%. | Choose LTC4058 when cell voltage sensing accuracy is critical or when analog current monitoring is needed for fuel gauging; retains pin compatibility but adds one extra sense trace. |
Compared with LTC4054ES5-4.2#TRMPBF, the LTC4068XEDD-4.2#TRPBF offers higher current capability, ACPR status signaling, and programmable termination - making it superior for USB-hosted systems needing robust power-state awareness. Versus LTC4058EDD-4.2#TRPBF, it trades Kelvin sensing and IMON for lower cost and simpler layout, ideal for cost-sensitive consumer audio where ±1% float voltage suffices.
Availability
LTC4068XEDD-4.2#TRPBF is available at Aetrix Electronics and suitable for portable audio devices, Bluetooth accessories, medical wearables, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed DFN package consistency.
Supply support for LTC4068XEDD-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 LTC4068X series was designed specifically for space-constrained, USB-powered Li-ion charging applications where minimal external components, thermal resilience, and deterministic termination behavior are mandatory - targeting consumer electronics with stringent size and reliability requirements.
FAQ
What is the key functional difference between LTC4068XEDD-4.2#TRPBF and LTC4068EDD-4.2#TRPBF?
The LTC4068XEDD-4.2#TRPBF omits the 2.9 V trickle charge feature present in the standard LTC4068EDD-4.2#TRPBF. This means the LTC4068XEDD-4.2#TRPBF begins constant-current charging immediately when VBAT ≥ ~3.0 V and does not deliver reduced current to deeply discharged cells. It simplifies design for applications using pre-charged or protected battery packs.
Does LTC4068XEDD-4.2#TRPBF require an external blocking diode?
No, the LTC4068XEDD-4.2#TRPBF does not require an external blocking diode. Its internal P-channel MOSFET architecture prevents reverse current flow from battery to input, eliminating diode voltage drop and associated power loss - a key enabler for USB 5 V efficiency and thermal performance.
How is charge termination configured on LTC4068XEDD-4.2#TRPBF?
Charge termination on LTC4068XEDD-4.2#TRPBF is configured via an external resistor RTERM connected from the ITERM pin (Pin 1) to ground. The termination threshold is calculated as ITERM = 100 mV / RTERM. For example, RTERM = 1 kΩ yields 100 mA termination - suitable for C/10 cutoff on a 1000 mAh cell.
What is the role of the exposed pad (Pin 9) on LTC4068XEDD-4.2#TRPBF?
The exposed pad (Pin 9) on LTC4068XEDD-4.2#TRPBF is electrically connected to ground and serves as the primary thermal path. It must be soldered to a PCB ground plane to achieve the specified θJA = 40°C/W; failure to do so raises thermal resistance significantly, causing premature thermal regulation and reduced charge current.
Can LTC4068XEDD-4.2#TRPBF operate from a 5 V USB port without additional circuitry?
Yes, LTC4068XEDD-4.2#TRPBF is explicitly designed for direct USB 5 V operation. With VCC = 4.25–6.5 V, built-in UVLO (3.8 V), and no external components beyond RPROG and RTERM, it meets USB power specifications and delivers up to 950 mA while maintaining thermal safety - confirmed in Linear's Application Note 88 and datasheet Figure 3.
LTC4068XEDD-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)
LTC4068XEDD-4.2#TRPBF FAQ
1.How can I place an order for LTC4068XEDD-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4068XEDD-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 LTC4068XEDD-4.2#TRPBF reliable?
The price and inventory of LTC4068XEDD-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 LTC4068XEDD-4.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4068XEDD-4.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4068XEDD-4.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4068XEDD-4.2#TRPBF?
LTC4068XEDD-4.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4068XEDD-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 LTC4068XEDD-4.2#TRPBF?
For technical support, including LTC4068XEDD-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4068XEDD-4.2#TRPBF requirements.
6.How does Aetrix verify that LTC4068XEDD-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4068XEDD-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 LTC4068XEDD-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4068XEDD-4.2#TRPBF?
All LTC4068XEDD-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4068XEDD-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 LTC4068XEDD-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4068XEDD-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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