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Analog Devices Inc. LTC4080XEDD#PBF
- Part No.:
- LTC4080XEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- -
- Datasheet:
-
LTC4080XEDD#PBF.pdf
- Description:
- LTC4080 - 500MA STANDALONE LI-IO
- Quantity:
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Product details
Overview
LTC4080XEDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic Li-ion battery charger IC with integrated 300mA synchronous buck regulator in a 10-lead 3mm × 3mm DFN package. It delivers 500mA constant-current/constant-voltage charging to single-cell 4.2V batteries, regulates output voltage from 0.8V to VBAT, and operates within USB power specifications. Used in compact portable devices such as Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4080XEDD#PBF datasheet, LTC4080XEDD#PBF pinout, LTC4080XEDD#PBF application, or LTC4080XEDD#PBF equivalent, key selection criteria include its dual-function architecture (charger + buck), thermal-regulated 500mA charge current, 4.5-hour safety timer, C/10 charge termination detection, and MODE-selectable Burst Mode® (23µA no-load IBAT) vs PWM mode (2.25MHz).
Technical Context
The LTC4080XEDD#PBF integrates two independent power systems: a linear battery charger with constant-current/constant-voltage/constant-temperature regulation and a BAT-powered synchronous buck converter. Its thermal feedback loop actively reduces charge current above ~115°C to prevent overheating without external components.
The buck regulator accepts 2.7V–4.5V input from the BAT pin, delivers up to 300mA at adjustable output (0.8V–VBAT), and supports two operating modes: fixed-frequency PWM (2.25MHz, 300mA max) or low-IQ Burst Mode® (23µA no-load IBAT). Both subsystems operate simultaneously or independently under separate enable controls (EN_CHRG, EN_BUCK).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Programmable up to 500mA ±5%; enables fast charging of single-cell Li-ion with thermal foldback at ~115°C. |
| Float Voltage | 4.2V ±0.5% (4.158V–4.242V); precision regulation ensures safe full-charge termination for 4.2V Li-ion/polymer cells. |
| Buck Output Range | 0.8V to VBAT; supports 1.8V/300mA operation typical in portable logic rails and RF sections. |
| Buck No-Load IBAT | 23µA in Burst Mode®; extends battery runtime during standby in always-on wearable applications. |
| Charge Termination | C/10 detection via CHRG pin + 4.5-hour safety timer; prevents overcharge and complies with battery manufacturer guidelines. |
| Package | 10-lead 3mm × 3mm DFN (0.75mm height); exposed pad (Pin 11) must be soldered to PCB ground for thermal performance (θJA = 43°C/W). |
| Input Voltage Range | VCC: 3.75V–5.5V; compatible with USB 2.0 (5V) and USB-C legacy power profiles. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 43°C/W) and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery connection & buck input | Supplies charge current to battery and powers buck regulator; float voltage regulated to 4.2V; must be decoupled with low-ESR capacitor. |
| VCC (2) | Charger supply input | 3.75V–5.5V input for linear charger; UVLO activates at 3.6V rising edge with 0.6V hysteresis. |
| EN_CHRG (3) | Charger enable control | Pull >1.2V to disable charger; default active-low; <10µA shutdown supply current when disabled. |
| PROG (4) | Charge current programming & monitoring | 1% resistor to GND sets ICHRG = 400 × VPROG/RPROG; VPROG = 1.0V ±20mV in CC mode. |
| ACPR (5) | Power status indicator | Open-drain output pulled low when VCC > 3.6V and VCC – VBAT > 82mV; signals valid charging conditions. |
| CHRG (6) | Charge status indicator | Open-drain output: low during charge, high-Z at C/10, 2Hz pulsing (75% duty) if defective battery detected (<2.9V). |
| FB (7) | Buck output voltage feedback | Servo point = 0.8V ±20mV; resistor divider from VOUT to GND programs output voltage. |
| MODE (8) | Buck operating mode select | Tie to VBAT for Burst Mode® (23µA no-load IBAT); tie to GND for PWM mode (2.25MHz). |
| EN_BUCK (9) | Buck regulator enable | Active-high control; disables buck and reduces IBAT to 10–20µA in sleep mode. |
| SW (10) | Buck switch node | Connects to inductor; requires short, low-inductance trace and placement adjacent to inductor for EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-power architecture | Single-chip solution combining 500mA Li-ion charger and 300mA buck regulator eliminates discrete DC/DC and reduces BOM count by ≥5 components. |
| Thermal-regulated charge current | Automatic current reduction above ~115°C junction temperature prevents thermal runaway without external sensors or compensation circuits. |
| USB-compliant input interface | VCC range (3.75V–5.5V) and automatic shutdown when VCC – VBAT < 82mV ensure safe operation directly from USB ports. |
| C/10 + timer dual-termination | Combines precise end-of-charge detection (CHRG high-Z at 10% ICHRG) with 4.5-hour safety timer to meet IEC 62133 and UL 1642 requirements. |
| Burst Mode® efficiency optimization | Reduces no-load battery current to 23µA-critical for multi-day battery life in wearables and always-on IoT endpoints. |
Applications
| Wireless Headsets | Bluetooth Audio Devices |
|---|---|
Use Scenario: Compact, battery-powered headset with integrated microphone, audio codec, and Bluetooth radio requiring regulated 1.8V rail and safe Li-ion charging. IC Role / Device Role / Timing Role: LTC4080XEDD#PBF provides simultaneous 500mA charging and 1.8V/300mA system power from single-cell Li-ion. Use Value: Eliminates need for separate charger and LDO/DC-DC, reducing board area by >30% and enabling sub-20mm form factors. |
Use Scenario: Portable Bluetooth speaker with USB-rechargeable battery and Class-D amplifier needing stable 3.3V logic and 12V driver supply. IC Role / Device Role / Timing Role: LTC4080XEDD#PBF charges battery while powering 1.8V digital core; external boost stage derives 12V from VBAT. Use Value: Enables USB-native charging without AC adapter dependency and maintains >85% buck efficiency across 1–100mA load range. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Flash-based audio player with OLED display, touch interface, and 8–16 hour runtime requiring low-noise, thermally robust power management. IC Role / Device Role / Timing Role: LTC4080XEDD#PBF delivers 500mA CC/CV charge with thermal foldback and supplies clean 1.8V to MCU/display driver. Use Value: Thermal regulation allows aggressive charge rates without derating for ambient temperature, cutting recharge time by 22% vs non-thermal designs. |
Use Scenario: Smartwatch with heart-rate sensor, accelerometer, BLE radio, and 200mAh Li-ion battery needing ultra-low quiescent current during sleep. IC Role / Device Role / Timing Role: LTC4080XEDD#PBF operates in Burst Mode® (23µA no-load IBAT) during watch sleep cycles while maintaining battery health. Use Value: Extends shelf life and standby duration to >6 months without maintenance charging, meeting ISO 22716 cosmetic device requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | 500mA linear charger only; no integrated buck regulator; requires external DC-DC for system rail generation. | Suitable for cost-sensitive designs where system voltage matches battery or uses separate regulator; lacks integrated power conversion. | Select when board space permits discrete buck and thermal constraints allow non-thermal-foldback charging. |
| MAX1555ESA+ | 300mA charger + 200mA LDO (not buck); fixed 3.3V output; no Burst Mode®; higher no-load IBAT (100µA). | Fits simple 3.3V microcontroller systems but cannot support 1.8V or adjustable rails; less efficient at light loads. | Choose for legacy 3.3V-only designs where ultra-low standby current is not required and LDO noise tolerance is acceptable. |
Compared with BQ24075RGTR and MAX1555ESA+, the LTC4080XEDD#PBF uniquely integrates a thermally regulated 500mA charger and programmable 300mA buck in one 3mm × 3mm DFN-enabling smaller footprints, longer battery life via Burst Mode®, and flexible voltage scaling for modern low-voltage SoCs.
Availability
LTC4080XEDD#PBF is available at Aetrix Electronics and suitable for wireless headsets, Bluetooth audio devices, and portable MP3 players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4080XEDD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors with deep expertise in precision power conversion and battery management.
The LTC4080XEDD#PBF belongs to Linear's Power Management product line, designed specifically for space-constrained portable electronics requiring integrated, thermally robust, and USB-compliant battery charging with on-board system power regulation.
FAQ
What is the maximum charge current supported by the LTC4080XEDD#PBF?
The LTC4080XEDD#PBF supports a programmable constant-current charge up to 500mA with ±5% accuracy, set by a 1% resistor from PROG pin to ground. At RPROG = 806Ω, full-scale current is 500mA; at RPROG = 4kΩ, it is 100mA. Thermal regulation automatically reduces this current if junction temperature exceeds ~115°C.
Does the LTC4080XEDD#PBF require external MOSFETs for charging?
No. The LTC4080XEDD#PBF integrates an internal P-channel power MOSFET for the linear charger and synchronous NMOS/PMOS switches for the buck regulator. No external FETs, blocking diodes, or current-sense resistors are needed-reducing total component count and PCB area.
How does the LTC4080XEDD#PBF indicate end-of-charge status?
The LTC4080XEDD#PBF uses the open-drain CHRG pin: it pulls low during active charging, transitions to high-impedance when charge current drops to C/10 (10% of programmed value), and pulses at 2Hz (75% duty cycle) if a defective battery (<2.9V) is detected. A 4.5-hour internal timer also forces CHRG to high-Z upon timeout.
Can the LTC4080XEDD#PBF operate from a USB port without additional circuitry?
Yes. The LTC4080XEDD#PBF is explicitly designed for USB compliance: VCC accepts 3.75V–5.5V, includes undervoltage lockout (3.6V threshold), and automatically disables charging if VCC – VBAT falls below 82mV-preventing backfeed and ensuring safe plug-in/plug-out behavior.
What is the purpose of the MODE pin on the LTC4080XEDD#PBF?
The MODE pin selects the buck regulator's operating mode: tying it high enables Burst Mode® (23µA no-load IBAT, optimal for battery life), while tying it low forces constant-frequency PWM mode (2.25MHz, optimal for noise-sensitive loads). Floating the pin is prohibited; it must be actively driven to GND or VBAT.
LTC4080XEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Battery Chemistry:
- -
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC4080XEDD#PBF FAQ
1.How can I place an order for LTC4080XEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4080XEDD#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 LTC4080XEDD#PBF reliable?
The price and inventory of LTC4080XEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4080XEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4080XEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4080XEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4080XEDD#PBF?
LTC4080XEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4080XEDD#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 LTC4080XEDD#PBF?
For technical support, including LTC4080XEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4080XEDD#PBF requirements.
6.How does Aetrix verify that LTC4080XEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4080XEDD#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 LTC4080XEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4080XEDD#PBF?
All LTC4080XEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4080XEDD#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 LTC4080XEDD#PBF part is unused and in its original packaging.
Return procedure for LTC4080XEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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