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Analog Devices Inc. LTC4081EDD#TRPBF
- Part No.:
- LTC4081EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4081EDD#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,532
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Product details
Overview
LTC4081EDD#TRPBF 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 supports dual-mode operation (Burst Mode® or 2.25MHz PWM) for the buck stage - used in wireless headsets and Bluetooth audio systems.
For engineers reviewing the LTC4081EDD#TRPBF datasheet, LTC4081EDD#TRPBF pinout, LTC4081EDD#TRPBF application, or LTC4081EDD#TRPBF 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 compatibility with USB power constraints (3.75–5.5V VCC).
Technical Context
The LTC4081EDD#TRPBF integrates two independent power subsystems: a linear battery charger with programmable current (via PROG pin), thermal feedback loop limiting charge current above ~115°C, and automatic C/10 termination; and a BAT-powered synchronous buck converter with MODE-selectable operation (2.25MHz PWM or low-IQ Burst Mode®). Both subsystems share no internal coupling - enabling simultaneous or independent operation.
Its control architecture uses three dedicated amplifiers (CA, VA, TA) for concurrent constant-current, constant-voltage, and constant-temperature regulation - not sequential fallbacks. The CHRG pin provides open-drain status signaling with distinct states: active pull-down (charging), high-Z (C/10 reached or shutdown), and 2Hz pulsing (defective battery or NTC fault).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFLOAT | 4.2V ±0.5% - precise single-cell Li-ion termination voltage, minimizing overcharge risk while maximizing capacity utilization. |
| ICHRG Max | 500mA - programmable via external resistor on PROG pin, with 5% accuracy and thermal derating above 115°C junction temperature. |
| Buck Output Range | 0.8V to VBAT - adjustable output via FB divider, supporting 1.5V/1.8V logic rails directly from battery. |
| Buck IOUT | 300mA - continuous load capability in PWM mode; Burst Mode® maintains regulation down to µA loads with 23µA quiescent battery current. |
| tTIMER | 4.5 hours (typical) - fixed safety timer prevents indefinite charging; freezes during NTC or thermal faults. |
| IQ Shutdown | 5µA (VCC) / 2µA (VBAT) - ultra-low leakage enables long shelf life in battery-backed systems. |
| Package | 10-lead 3mm × 3mm DFN (0.75mm height) - exposed pad must be soldered to PCB ground for thermal performance (θJA = 43°C/W). |
Pinout & Package
10-lead (3mm × 3mm) DFN package with exposed thermal pad (Pin 11 = GND), requiring PCB soldering for rated thermal performance (θJA = 43°C/W). Pin functions validated per Linear Technology LTC4081 datasheet Rev. FA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Charge output & buck input | Drives battery with linear FET; powers buck converter - requires low-ESR decoupling for stable switching. |
| VCC (2) | Charger supply input | 3.75–5.5V USB-compliant input; UVLO at 3.6V rising with 0.6V hysteresis. |
| EN_CHRG (3) | Charger enable/disable | Pull >1.2V to disable charger; <0.4V to enable; internal 1–3.3MΩ pull-down ensures default-on if floating. |
| PROG (4) | Charge current programming | Serves as current sense node (1.0V ±20mV); IBAT = 400 × VPROG/RPROG enables accurate current setting. |
| NTC (5) | Thermistor interface | Monitors battery temperature via resistive divider; suspends charging if VNTC <0.35×VCC (hot) or >0.76×VCC (cold). |
| CHRG (6) | Open-drain status output | Three-state indicator: low (charging), high-Z (C/10 or shutdown), 2Hz pulse (NTC fault or defective battery). |
| FB (7) | Buck feedback input | 0.8V reference sets output voltage; VOUT = 0.8V × (1 + R1/R2) enables precise rail generation. |
| MODE (8) | Buck operating mode select | High = Burst Mode® (23µA IQ); low = 2.25MHz PWM; must not float. |
| EN_BUCK (9) | Buck enable input | Active-high control; disables buck stage independently of charger; <0.4V = off, >1.2V = on. |
| SW (10) | Buck switch node | Connects to external inductor; requires minimal trace length and proximity to inductor for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charger + buck regulator | Eliminates need for separate PMIC stages - reduces BOM count by ≥4 components (charger IC, buck IC, two inductors, associated passives). |
| Thermal regulation at 115°C | Automatically scales charge current to prevent die overheating without external sensors or firmware intervention. |
| C/10 charge termination detection | CHRG pin transitions to high-Z at 10% of programmed current - enables reliable end-of-charge signaling without external comparators. |
| Burst Mode® operation | Reduces buck quiescent current to 23µA (vs 1.9mA in PWM mode), extending battery runtime in standby/sleep states. |
| NTC thermistor input with hysteresis | Supports JEITA-compliant charging profiles - suspends charging outside safe temperature range (e.g., <0°C or >45°C) with 3°C hysteresis. |
| USB-compatible input range | Operates from 3.75–5.5V VCC with undervoltage lockout at 3.6V - compliant with USB 2.0 host/port voltage specifications. |
Applications
| Wireless Headsets | Bluetooth Audio Modules |
|---|---|
Use Scenario: Compact earbud design requiring simultaneous battery charging and low-noise 1.8V DSP core supply. IC Role / Device Role / Timing Role: LTC4081EDD#TRPBF acts as primary power management unit - linear charger manages Li-ion cell; buck regulator powers codec/DSP at 1.8V/300mA. Use Value: Single-chip solution eliminates discrete buck converter, reducing PCB area by >25mm² and eliminating 2–3 passive components per rail. |
Use Scenario: Portable Bluetooth speaker with USB-C charging and dual 3.3V/1.8V system rails. IC Role / Device Role / Timing Role: LTC4081EDD#TRPBF provides regulated 1.8V for Bluetooth SoC and charges battery; VCC accepts USB 5V input directly. Use Value: Burst Mode® extends idle battery life to >30 days; thermal regulation prevents overheating during fast charging in enclosed enclosures. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Flash-based music player with 300mAh Li-poly battery and OLED display requiring stable 3.3V supply. IC Role / Device Role / Timing Role: LTC4081EDD#TRPBF charges battery while powering display driver via buck stage set to 3.3V. Use Value: 5µA shutdown current preserves battery during months of storage; C/10 detection enables precise full-charge cutoff without microcontroller polling. |
Use Scenario: Smartwatch with heart-rate sensor, BLE radio, and rechargeable coin-cell-sized battery. IC Role / Device Role / Timing Role: LTC4081EDD#TRPBF serves as compact power manager - charger handles 150mA charging; buck supplies 1.8V to BLE SoC. Use Value: 3mm × 3mm DFN footprint fits constrained watch PCBs; NTC input enables safe charging across ambient temperatures (–10°C to +50°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Standalone linear charger only (no integrated buck); 1A max charge current; no NTC input; 28-pin QFN. | Requires external DC-DC for system rails; suitable for higher-current charging where buck integration is unnecessary. | Select when system already has efficient buck converter and only needs robust charging with USB compliance. |
| MAX1555EZK+T | Linear charger + LDO (not buck); 500mA charge; no NTC; fixed 3.3V LDO output; 6-pin SOT23. | Provides fixed 3.3V rail only; cannot generate 1.8V or other voltages; lower efficiency than synchronous buck under load. | Select for ultra-small footprint and simple 3.3V bias rail needs, but avoid when variable/low-voltage rails or high buck efficiency are required. |
Compared with BQ24075RGTR and MAX1555EZK+T, the LTC4081EDD#TRPBF uniquely combines charger and synchronous buck in one 10-pin DFN, enabling smaller solutions with higher conversion efficiency and flexible output voltage - critical for space-constrained, multi-rail portable devices.
Availability
LTC4081EDD#TRPBF 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 guaranteed traceable sourcing.
Supply support for LTC4081EDD#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 consumer markets.
The LTC4081EDD#TRPBF belongs to Linear's Power Management family, designed specifically for highly integrated, USB-powered portable electronics where space, thermal performance, and dual-function power delivery are critical.
FAQ
What is the maximum charge current supported by the LTC4081EDD#TRPBF?
The LTC4081EDD#TRPBF supports a maximum programmable charge current of 500mA with ±5% accuracy, set by an external resistor on the PROG pin. This value is achievable when thermal conditions allow - the device automatically reduces current above ~115°C junction temperature to maintain safe operation. The LTC4081EDD#TRPBF also includes trickle charge (10% of programmed current) for deeply discharged batteries below 2.9V.
How does the LTC4081EDD#TRPBF handle battery temperature monitoring?
The LTC4081EDD#TRPBF uses the NTC pin to monitor battery temperature via a resistive divider between VCC and GND. Charging suspends when the NTC pin voltage falls below 0.35 × VCC (indicating hot conditions) or rises above 0.76 × VCC (indicating cold conditions), with ~3°C hysteresis per threshold. During suspension, the CHRG pin pulses at 2Hz with 25% duty cycle. The LTC4081EDD#TRPBF does not require external ADCs or microcontroller intervention for this function.
Can the LTC4081EDD#TRPBF operate without an external inductor?
No - the LTC4081EDD#TRPBF's integrated synchronous buck converter requires an external inductor (typically 10µH) connected between the SW and VOUT pins. Omitting the inductor disables buck regulation and may damage the IC due to uncontrolled current flow. The linear charger portion remains functional without the inductor, but the 300mA regulated output will not be available. The LTC4081EDD#TRPBF datasheet specifies layout guidelines including inductor placement adjacent to the SW pin.
What is the purpose of the MODE pin on the LTC4081EDD#TRPBF?
The MODE pin on the LTC4081EDD#TRPBF selects the buck converter's operating mode: tying it high enables Burst Mode® operation (23µA typical quiescent battery current), ideal for light-load or standby conditions; tying it low forces constant-frequency 2.25MHz PWM mode (1.9mA no-load battery current), preferred for noise-sensitive or high-efficiency full-load applications. The pin must not be left floating - the LTC4081EDD#TRPBF requires a defined logic level for stable regulation.
Does the LTC4081EDD#TRPBF support USB enumeration or data communication?
No - the LTC4081EDD#TRPBF is a power management IC only and does not implement USB protocol handling, enumeration, or data communication. It accepts USB-compliant 5V input (3.75–5.5V VCC range) and adheres to USB power delivery constraints (e.g., current limiting, UVLO), but lacks USB transceivers, ID detection, or BC1.2/USB PD logic. System-level USB communication must be handled by a separate microcontroller or USB-capable SoC. The LTC4081EDD#TRPBF focuses solely on safe, efficient power conversion and battery management.
LTC4081EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4081EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4081EDD#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 LTC4081EDD#TRPBF reliable?
The price and inventory of LTC4081EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4081EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4081EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4081EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4081EDD#TRPBF?
LTC4081EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4081EDD#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 LTC4081EDD#TRPBF?
For technical support, including LTC4081EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4081EDD#TRPBF requirements.
6.How does Aetrix verify that LTC4081EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4081EDD#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 LTC4081EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4081EDD#TRPBF?
All LTC4081EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4081EDD#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 LTC4081EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4081EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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