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Analog Devices Inc. LTC4081EDD#PBF
- Part No.:
- LTC4081EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4081EDD#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:153
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Product details
Overview
LTC4081EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic Li-ion battery charger IC with integrated 300mA synchronous buck regulator, designed for USB-powered portable devices. It delivers up to 500mA constant-current/constant-voltage charging with ±0.5% float voltage accuracy (4.2V), includes NTC thermistor input for temperature-qualified charging, and features dual-mode operation (Burst Mode® or 2.25MHz PWM) for optimal efficiency across load ranges. Used in wireless headsets and Bluetooth audio peripherals.
For engineers reviewing the LTC4081EDD#PBF datasheet, LTC4081EDD#PBF pinout, LTC4081EDD#PBF application, or LTC4081EDD#PBF equivalent, key selection criteria include its dual-function integration (charger + regulator), thermal regulation at 115°C, C/10 charge termination detection, 5µA shutdown current, and 10-lead 3mm × 3mm DFN package with exposed pad for thermal management.
Technical Context
The LTC4081EDD#PBF implements a three-loop control architecture-constant-current (CA), constant-voltage (VA), and constant-temperature (TA)-to dynamically regulate charge current based on battery voltage, programmed float level (4.2V), and die temperature (115°C limit). Its linear charger uses an internal P-channel MOSFET (RON = 700mΩ) without external sense resistor or blocking diode.
The integrated buck converter operates from the BAT pin (2.7V–4.5V input), delivers up to 300mA at adjustable output (0.8V–VBAT), and supports mode selection via MODE pin: fixed-frequency PWM (2.25MHz) or low-IQ Burst Mode® (23µA no-load IBAT). FB pin servo voltage is 0.80V ±2%, enabling precise output regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Up to 500mA with ±5% accuracy; programmable via PROG pin resistor (e.g., 2kΩ → 200mA) |
| Float Voltage | 4.2V ±0.5%; internally regulated with precision resistor divider referenced to BAT pin |
| Buck Output Range | 0.8V to VBAT; adjustable via FB pin resistor divider; typical 1.8V/300mA configuration shown |
| Shutdown Current | 5µA supply current (ICC_SD) and 2µA battery drain (IBAT_SD) when both charger and buck are disabled |
| Thermal Regulation | Junction temperature limit at 115°C; automatically reduces charge current to prevent overheating |
| NTC Input Support | Dedicated NTC pin with cold/hot fault thresholds at 0.76×VCC and 0.35×VCC; enables safe temperature-qualified charging |
| Timer Termination | Internal 4.5-hour safety timer (3–6 hr range); terminates charge even if C/10 condition not met |
Pinout & Package
Package: 10-lead, 3mm × 3mm × 0.75mm low-profile DFN with exposed thermal pad (Pin 11 = GND). Requires PCB soldering of exposed pad for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Charge output & buck input | Delivers regulated 4.2V to battery; powers buck stage; requires low-ESR decoupling capacitor |
| VCC (2) | Charger input supply | Accepts 3.75–5.5V (USB-compliant); UVLO at 3.6V rising; shuts down if VCC < VBAT + 82mV |
| EN_CHRG (3) | Charger enable/disable | Pull >1.2V to disable charger; draws <1µA; default-enabled when tied to GND |
| PROG (4) | Charge current programming | Serves as current monitor; holds 1.0V during CC mode; IBAT = 400 × VPROG/RPROG |
| NTC (5) | Temperature monitoring input | Connects to thermistor/resistor divider; triggers charge suspension at hot/cold thresholds |
| CHRG (6) | Open-drain status output | Pulled low during charge; high-Z at C/10; pulses 2Hz for defective battery or NTC fault |
| FB (7) | Buck feedback reference | Servo point = 0.80V; sets output voltage via external resistor divider (e.g., 100kΩ/100kΩ → 1.6V) |
| MODE (8) | Buck operating mode select | Tie to VBAT for Burst Mode® (23µA no-load); tie to GND for fixed 2.25MHz PWM |
| EN_BUCK (9) | Buck regulator enable | Active-high logic; disables buck and reduces IBAT to 10–20µA in SLEEP mode |
| SW (10) | Buck switch node | Connects to inductor; requires short trace and close placement to minimize EMI and losses |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-function IC | Combines full-featured Li-ion charger (500mA, 4.2V) and 300mA synchronous buck in single 3mm × 3mm DFN |
| Thermal regulation with priority | Three-loop control (CC/CV/CT) ensures safe charging under ambient or power-dissipation stress without external components |
| USB-compliant power management | Meets USB voltage and current limits; automatic UVLO and UVCL prevent overloading weak sources |
| Low-quiescent-power modes | 5µA shutdown (both blocks off), 23µA Burst Mode® buck operation, and 1.9mA no-load PWM mode |
| Robust battery safety logic | Includes trickle charge (2.9V threshold), defective battery detection (2Hz CHRG pulse), and 4.5-hr timer termination |
Applications
| Wireless Headsets | Bluetooth Audio Modules |
|---|---|
Use Scenario: Compact wearable headset requiring simultaneous battery charging and low-noise 1.8V rail for Bluetooth SoC and audio codec. IC Role / Device Role / Timing Role: LTC4081EDD#PBF acts as primary power management unit-charging single-cell Li-ion while generating clean, regulated 1.8V/300mA for RF and analog circuitry. Use Value: Eliminates need for separate charger and LDO/buck; Burst Mode® extends standby time; NTC input prevents thermal runaway during pocket-charging. | Use Scenario: Small-form-factor Bluetooth speaker with USB-C charging and battery-backed operation. IC Role / Device Role / Timing Role: LTC4081EDD#PBF manages battery charge state and powers the audio amplifier and MCU from BAT pin, enabling efficient use of battery energy during playback. Use Value: 300mA buck output sustains peak audio loads; thermal regulation allows aggressive charge profiles without derating; 5µA shutdown preserves battery during storage. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Battery-powered music player with USB recharging and OLED display requiring stable 3.3V rail. IC Role / Device Role / Timing Role: LTC4081EDD#PBF charges the cell and supplies regulated voltage to display driver and audio DAC via adjustable buck output. Use Value: Programmable buck output (0.8V–VBAT) supports 3.3V generation; soft-start (180µs) prevents display flicker at power-on; C/10 detection signals full charge to host MCU. | Use Scenario: Smart wristwatch with integrated sensors, BLE radio, and coin-cell-sized Li-ion battery. IC Role / Device Role / Timing Role: LTC4081EDD#PBF serves as ultra-low-power system PMIC-managing charge, regulating sensor rail, and minimizing quiescent draw during sleep cycles. Use Value: 23µA Burst Mode® buck operation extends runtime between charges; 2µA battery drain in shutdown preserves charge for months; compact DFN fits constrained watch PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RTWR | Single-function Li-ion charger only (no integrated buck); 1A max charge; no NTC input; 20-pin QFN | Requires external regulator for system rail; lacks temperature qualification and dual-mode efficiency optimization | Choose when higher charge current is needed and buck functionality is provided separately |
| MAX1555ESA+ | Linear charger + LDO (not buck); 500mA charge; no NTC; 8-pin SOIC; fixed 3.3V LDO output | LDO output limited to 3.3V/150mA; no adjustable buck, no Burst Mode®, higher dropout losses | Prefer for cost-sensitive designs where fixed 3.3V rail suffices and board space allows SOIC |
Compared with BQ24075RTWR and MAX1555ESA+, the LTC4081EDD#PBF uniquely integrates a programmable synchronous buck with temperature-aware charging in a 10-lead DFN-reducing component count, improving light-load efficiency, and enabling compact, thermally robust USB-powered portable designs.
Availability
LTC4081EDD#PBF is available at Aetrix Electronics and suitable for wireless headsets, Bluetooth audio modules, and portable MP3 players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC4081EDD#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 and maintains its high-performance analog and power management portfolio. Linear pioneered precision battery management ICs with emphasis on integration, accuracy, and reliability.
The LTC4081EDD#PBF belongs to Linear's PowerPath™ and battery charger product line, engineered specifically for space-constrained, USB-powered portable electronics needing combined charging and system power regulation without compromising safety or efficiency.
FAQ
What is the maximum charge current supported by the LTC4081EDD#PBF?
The LTC4081EDD#PBF supports a maximum charge current of 500mA with ±5% accuracy, set by the resistor connected between PROG pin and ground (e.g., 0.8kΩ yields ~500mA). The device also includes undervoltage charge limiting and thermal regulation to safely maintain this current under real-world conditions. The LTC4081EDD#PBF automatically reduces current if junction temperature exceeds 115°C or input voltage falls below safe margin above battery voltage.
How does the NTC thermistor interface work on the LTC4081EDD#PBF?
The LTC4081EDD#PBF uses the NTC pin to monitor battery temperature via a resistor divider formed by a thermistor to ground and a matching resistor to VCC. Charging suspends when NTC pin voltage drops below 0.35×VCC (hot fault) or rises above 0.76×VCC (cold fault), and the CHRG pin pulses at 2Hz. The LTC4081EDD#PBF provides built-in hysteresis (~3°C) and disables NTC monitoring if the pin is pulled below 0.016×VCC.
Can the LTC4081EDD#PBF operate without an external inductor?
No-the LTC4081EDD#PBF's integrated synchronous buck converter requires an external inductor (typically 10µH) connected between SW and VOUT pins. The inductor is essential for energy storage and ripple control; omitting it prevents buck regulation and may damage the IC. The LTC4081EDD#PBF's linear charger section functions independently, but the buck output will be non-functional without proper magnetics and output capacitance.
What is the purpose of the MODE pin on the LTC4081EDD#PBF?
The MODE pin selects the LTC4081EDD#PBF buck converter's operating mode: tying MODE to VBAT enables Burst Mode® (23µA no-load IBAT, ideal for light loads), while tying MODE to GND forces fixed-frequency PWM operation (2.25MHz, lower output ripple, better transient response). The LTC4081EDD#PBF does not auto-switch modes-it strictly follows the MODE pin state, and floating the pin is prohibited.
Does the LTC4081EDD#PBF support automatic recharge?
Yes-the LTC4081EDD#PBF supports automatic recharge: when battery voltage falls ~100mV below the float voltage (e.g., from 4.2V to ~4.1V), the device restarts the charge cycle without external intervention. This occurs after a 2.25-hour recharge delay (1.5–3 hr range) and is independent of EN_CHRG state. The LTC4081EDD#PBF also includes trickle charge for batteries below 2.9V and a 4.5-hour safety timer to prevent indefinite charging.
LTC4081EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 500mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4081EDD#PBF FAQ
1.How can I place an order for LTC4081EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4081EDD#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 LTC4081EDD#PBF reliable?
The price and inventory of LTC4081EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4081EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4081EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4081EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4081EDD#PBF?
LTC4081EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4081EDD#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 LTC4081EDD#PBF?
For technical support, including LTC4081EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4081EDD#PBF requirements.
6.How does Aetrix verify that LTC4081EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4081EDD#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 LTC4081EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4081EDD#PBF?
All LTC4081EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4081EDD#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 LTC4081EDD#PBF part is unused and in its original packaging.
Return procedure for LTC4081EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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