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Analog Devices Inc. LTC4080XEDD#TRPBF
- Part No.:
- LTC4080XEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4080XEDD#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,878
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Product details
Overview
LTC4080XEDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic linear Li-ion battery charger with integrated 300mA synchronous buck regulator in a 3mm × 3mm DFN-10 package. It delivers 500mA constant-current/constant-voltage charging to single-cell 4.2V batteries, supports USB-compliant input (3.75–5.5V), and provides adjustable 0.8V–VBAT buck output - used in compact portable electronics like Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4080XEDD#TRPBF datasheet, LTC4080XEDD#TRPBF pinout, LTC4080XEDD#TRPBF application, or LTC4080XEDD#TRPBF equivalent, key selection criteria include its dual-function integration (charger + regulator), thermal regulation at 115°C, C/10 charge termination detection, Burst Mode® operation (23µA no-load IBAT), and strict USB power compliance without external blocking diodes.
Technical Context
The LTC4080XEDD#TRPBF implements a three-loop control architecture-constant-current (PROG servo at 1.0V), constant-voltage (VBAT regulated to 4.2V ±0.5%), and constant-temperature (die-limited at 115°C)-with automatic priority arbitration between loops. Its charger uses an internal P-channel MOSFET (RON = 750mΩ) and requires only one external resistor for current programming.
The integrated buck converter draws power directly from the BAT pin (2.7–4.5V input), features MODE-pin-selectable 2.25MHz PWM or low-IQ Burst Mode®, and delivers up to 300mA with FB-set output (0.8V reference). Both subsystems operate independently: charger can run while buck is disabled, and vice versa.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Programmable up to 500mA (±5% accuracy); set by single RPROG resistor; enables compact USB-powered charging without external sense components. |
| Battery Float Voltage | 4.2V ±0.5% (typ. 4.179–4.221V); precision trimmed internal divider ensures safe Li-ion termination without external feedback. |
| Buck Output Range | 0.8V to VBAT; FB pin references 0.8V, allowing direct 1.8V/300mA output or other low-voltage rails from battery source. |
| Quiescent Current (Shutdown) | 5µA supply current (ICC_SD) and 2µA battery drain (IBAT_SD); preserves battery life during system sleep or standby. |
| Thermal Regulation Threshold | Junction temperature limit at 115°C; dynamically reduces charge current to prevent overheating on dense PCBs without external thermal sensors. |
| Charge Termination Timer | 4.5-hour safety timer (3–6 hr range); prevents overcharge under fault conditions and complies with Li-ion manufacturer guidelines. |
| C/10 Detection | CHRG pin transitions to high-impedance when IBAT ≤ 10% of programmed current; provides reliable end-of-charge signal for host MCU or LED indicator. |
Pinout & Package
Package: 10-lead 3mm × 3mm DFN (exposed pad = GND, Pin 11), 0.75mm profile, RoHS-compliant lead-free finish. Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (Pin 1) | Battery connection & buck input | Single node supplies both charger output and buck regulator input; decoupling capacitor required for low-noise operation. |
| VCC (Pin 2) | Charger input supply | Accepts 3.75–5.5V (USB-compliant); UVLO at 3.6V rising / 3.0V falling ensures safe startup from weak sources. |
| EN_CHRG (Pin 3) | Charger enable/disable | Pull >1.2V to disable charger; default-active (tie to GND if unused); reduces ICC to 5µA and IBAT to 2µA in shutdown. |
| PROG (Pin 4) | Charge current programming & monitoring | 1% resistor to GND sets current (IBAT = 400 × VPROG/RPROG); VPROG = 1.0V in CC mode for real-time current sensing. |
| ACPR (Pin 5) | Power-good status output | Open-drain; pulled low when VCC > 3.6V AND (VCC – VBAT) > 82mV - confirms valid USB input for charging readiness. |
| CHRG (Pin 6) | Charge status indicator | Three-state: low (charging), high-Z (C/10 reached or shutdown), 2Hz pulse (defective battery <2.9V for >1.125h). |
| FB (Pin 7) | Buck output voltage feedback | 0.8V reference; resistor divider from VOUT to FB programs output (e.g., 1.8V = 100kΩ/40kΩ); enables precise low-voltage regulation. |
| MODE (Pin 8) | Buck operating mode select | Tie to VBAT for Burst Mode® (23µA no-load IBAT); tie to GND for fixed 2.25MHz PWM (higher efficiency at medium loads). |
| EN_BUCK (Pin 9) | Buck regulator enable | Active-high; independent control allows buck to be enabled/disabled regardless of charger state - supports flexible power sequencing. |
| SW (Pin 10) | Buck switch node | Connects to external inductor; requires short, low-inductance trace and adjacent placement to minimize EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charger + buck in single DFN | Eliminates separate ICs and reduces BOM count by ≥4 components (no external blocking diode, sense resistor, or regulator IC required). |
| USB-compliant input interface | Meets USB 2.0 voltage and current limits; automatic UVLO and UVCL ensure safe operation from bus-powered hosts without external supervision. |
| Thermal-foldback charge control | Automatically throttles charge current above 115°C junction temperature - enables aggressive layout without derating or heatsinks. |
| Burst Mode® efficiency optimization | Reduces no-load battery current to 23µA (vs 1.9mA in PWM), extending runtime in always-on wearable or sensor applications. |
| C/10 and timer-based dual termination | Guarantees full charge completion while preventing overcharge - satisfies IEC 62133 and UL 1642 safety requirements for portable Li-ion systems. |
Applications
| Wireless Headsets | Bluetooth Audio Transceivers |
|---|---|
Use Scenario: Compact earbud design requiring simultaneous battery charging and low-noise 1.8V DSP core supply from a single Li-ion cell. IC Role / Device Role / Timing Role: LTC4080XEDD#TRPBF acts as primary power management unit - managing USB charging while generating clean, regulated 1.8V/300mA for audio codec and Bluetooth SoC. Use Value: Eliminates need for discrete LDO or DC/DC; Burst Mode® extends standby time; thermal regulation prevents heat buildup in sealed enclosure. |
Use Scenario: Small-form-factor Bluetooth speaker with USB recharging and dual-rail power (3.3V analog, 1.8V digital) derived from one battery. IC Role / Device Role / Timing Role: LTC4080XEDD#TRPBF provides 500mA CC/CV charging and powers 1.8V digital subsystem; external LDO generates 3.3V from VBAT. Use Value: Reduces board area by 30% vs discrete solution; C/10 detection synchronizes firmware charge-complete interrupt; 4.5h timer enforces safety compliance. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Flash-based music player with USB charging, OLED display, and audio DAC - all powered from 3.7V Li-ion cell. IC Role / Device Role / Timing Role: LTC4080XEDD#TRPBF delivers regulated 1.8V to microcontroller and DAC while charging battery; CHRG pin drives status LED. Use Value: Single-chip solution avoids cross-regulation noise between analog/digital domains; soft-start (180µs) prevents USB port brownout during plug-in. |
Use Scenario: Smartwatch with Bluetooth LE, heart-rate sensor, and segmented LCD - requiring ultra-low quiescent current and precise 1.8V rail. IC Role / Device Role / Timing Role: LTC4080XEDD#TRPBF operates in Burst Mode® to supply 1.8V/10mA to RTC and BLE controller during sleep; charger activates only during docked charging. Use Value: 23µA no-load IBAT extends battery life beyond 7 days in watch mode; defective battery detection (2.9V threshold) prevents false starts on aging cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Standalone 500mA Li-ion charger only (no integrated buck); requires external regulator for system rail generation. | Suitable where system voltage is fixed (e.g., 3.3V) and generated separately; lacks programmable buck output or Burst Mode®. | Select MAX1555 only if buck functionality is unnecessary and board space permits two ICs. |
| BQ24075 | 500mA charger with integrated 3.3V/200mA LDO (not buck); fixed output, higher dropout, no thermal foldback. | Appropriate for 3.3V-only systems with moderate load; cannot support 1.8V or adjustable rails; less efficient at light loads than Burst Mode®. | Choose BQ24075 when 3.3V LDO suffices and thermal margin is ample; avoid for 1.8V or high-efficiency battery-sensitive designs. |
Compared with MAX1555 and BQ24075, the LTC4080XEDD#TRPBF uniquely integrates a programmable synchronous buck converter with Burst Mode® and thermal regulation - enabling smaller footprint, lower no-load current, and flexible voltage rail generation not possible with charger-only or LDO-based alternatives.
Availability
LTC4080XEDD#TRPBF is available at Aetrix Electronics and suitable for wireless headsets, portable audio devices, and wearable electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4080XEDD#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 LTC4080XEDD#TRPBF belongs to Linear's Power Management family, designed specifically for space-constrained portable electronics needing integrated battery charging and efficient system-level voltage regulation - with emphasis on USB compatibility, thermal robustness, and minimal external components.
FAQ
What is the maximum charge current supported by the LTC4080XEDD#TRPBF?
The LTC4080XEDD#TRPBF supports a programmable constant-current charge up to 500mA with ±5% accuracy, set by a single external resistor connected to the PROG pin. At RPROG = 806Ω, the device delivers 500mA; at RPROG = 4kΩ, it delivers 100mA. The LTC4080XEDD#TRPBF maintains this accuracy across temperature and input voltage variations within its specified operating range.
Does the LTC4080XEDD#TRPBF require an external blocking diode?
No, the LTC4080XEDD#TRPBF does not require an external blocking diode. Its internal P-channel MOSFET (MP1) and control architecture prevent reverse current flow from the battery to the VCC input, eliminating the need for discrete diodes and associated forward-voltage drop or thermal loss. This simplifies design and improves efficiency in USB-powered applications.
How does the LTC4080XEDD#TRPBF handle thermal management during charging?
The LTC4080XEDD#TRPBF incorporates a dedicated constant-temperature control loop that activates when the junction temperature approaches 115°C. It dynamically reduces charge current to maintain die temperature at or below this threshold - protecting the IC and PCB without requiring external thermal sensors or firmware intervention. This feature is fully integrated and operates alongside CC/CV regulation.
Can the buck regulator in the LTC4080XEDD#TRPBF operate independently of the battery charger?
Yes, the buck regulator in the LTC4080XEDD#TRPBF operates independently: EN_BUCK controls it separately from EN_CHRG. The buck draws power from the BAT pin and functions whether the battery is charging, fully charged, or absent (as long as VBAT ≥ 2.7V). This allows use cases such as powering system logic from battery while charger is disabled or in shutdown.
What is the purpose of the ACPR pin on the LTC4080XEDD#TRPBF?
The ACPR (Adapter Present) pin on the LTC4080XEDD#TRPBF is an open-drain output indicating valid input power: it pulls low when VCC exceeds 3.6V AND (VCC – VBAT) > 82mV - confirming sufficient USB supply voltage and headroom for safe charging. When inactive, ACPR floats high-impedance, signaling insufficient or missing input - enabling host MCU to gate charging or enter low-power mode.
LTC4080XEDD#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:
- 525mA
- 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)
LTC4080XEDD#TRPBF FAQ
1.How can I place an order for LTC4080XEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4080XEDD#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 LTC4080XEDD#TRPBF reliable?
The price and inventory of LTC4080XEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4080XEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4080XEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4080XEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4080XEDD#TRPBF?
LTC4080XEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4080XEDD#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 LTC4080XEDD#TRPBF?
For technical support, including LTC4080XEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4080XEDD#TRPBF requirements.
6.How does Aetrix verify that LTC4080XEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4080XEDD#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 LTC4080XEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4080XEDD#TRPBF?
All LTC4080XEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4080XEDD#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 LTC4080XEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4080XEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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