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Analog Devices Inc. LTC4080EDD#PBF
- Part No.:
- LTC4080EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4080EDD#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,151
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Product details
Overview
LTC4080EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic Li-ion battery charger IC with integrated 300mA synchronous buck converter in a 10-lead 3mm × 3mm DFN package. It delivers 500mA constant-current/constant-voltage charging for single-cell 4.2V batteries, features thermal regulation at 115°C, a 4.5-hour safety timer, and C/10 charge termination detection - all optimized for USB-powered portable devices such as Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4080EDD#PBF datasheet, LTC4080EDD#PBF pinout, LTC4080EDD#PBF application, or LTC4080EDD#PBF equivalent, key selection criteria include its dual-function integration (charger + buck), programmable 0.8V–VBAT output range, Burst Mode® operation (23µA no-load IQ), and precise 4.2V ±0.5% float voltage with 5% charge current accuracy.
Technical Context
The LTC4080EDD#PBF integrates two independent power subsystems: a linear battery charger using internal P-channel MOSFET (RON_CHRG = 750mΩ) and a synchronous buck regulator powered from the BAT pin. Its constant-current/constant-voltage/constant-temperature (CC/CV/CT) architecture employs three feedback loops (CA, VA, TA) to dynamically prioritize charge rate, voltage regulation, and thermal safety without external intervention.
Charge control is implemented via PROG pin servoing to 1.0V (±2%) with 400× current scaling; buck regulation uses FB pin servoing to 0.8V (±2.5%) with MODE pin selecting between 2.25MHz PWM mode or low-IQ Burst Mode® (23µA no-load). Both subsystems support independent enable/disable via EN_CHRG and EN_BUCK pins, with automatic UVLO (3.6V VCC, 2.7V VBAT) and defective battery detection (2Hz CHRG pulsing).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFLOAT | 4.2V ±0.5% - precisely regulates single-cell Li-ion to safe termination voltage; enables full capacity without overvoltage risk. |
| ICHRG max | 500mA with 5% accuracy - set by RPROG; supports rapid charging of compact batteries in space-constrained designs. |
| Buck IOUT | 300mA - delivers regulated load current directly from battery, eliminating need for separate LDO or DC/DC stage. |
| Buck VOUT range | 0.8V to VBAT - adjustable via FB resistor divider; supports 1.8V logic rails or low-voltage peripherals without external components. |
| Quiescent IQ | 5µA shutdown (charger + buck off) - minimizes battery drain during system sleep, extending standby time. |
| Thermal limit | 115°C junction - reduces charge current proactively to prevent overheating on PCBs with limited copper area or airflow. |
| Timer duration | 4.5 hours (3–6h range) - hard safety cutoff prevents overcharge if C/10 termination fails; restartable via EN_CHRG or VCC cycle. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND), 0.75mm profile, –40°C to +85°C operating range. Exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery connection & buck input | Charger output and buck regulator input; supplies up to 800mA; requires low-ESR decoupling capacitor for stable switching. |
| VCC (2) | Charger input supply | 3.75–5.5V USB-compatible input; UVLO at 3.6V rising; shuts down when VCC < VBAT + 32mV. |
| EN_CHRG (3) | Charger enable control | Active-low logic input; VIH = 1.2V, VIL = 0.4V; tie to GND if unused to avoid spurious shutdown. |
| PROG (4) | Charge current programming & monitoring | Servo voltage = 1.0V ±2%; IBAT = 400 × VPROG/RPROG; enables real-time current measurement. |
| 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 = charging, high-Z = C/10 reached/timer expired, 2Hz pulse = defective battery. |
| FB (7) | Buck feedback reference | Servo voltage = 0.8V ±2.5%; sets VOUT via resistor divider; determines output regulation accuracy. |
| MODE (8) | Buck operating mode select | High = Burst Mode® (23µA no-load IQ); low = fixed 2.25MHz PWM; must not be left floating. |
| EN_BUCK (9) | Buck enable control | Active-high logic input; VIH = 1.2V, VIL = 0.4V; independent of charger state for flexible power sequencing. |
| SW (10) | Buck switch node | Connects to inductor; high di/dt node requiring short trace and adjacent ground pour to minimize EMI. |
| GND (11) | Ground reference & thermal path | Exposed pad; must be soldered to PCB ground plane for electrical integrity and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CC/CV/CT charging | Simultaneous control of current, voltage, and temperature ensures safe, fast charging without external compensation or thermal sensors. |
| Programmable 0.8V–VBAT buck output | Eliminates need for external regulators in low-power peripherals; supports dynamic voltage scaling for battery life optimization. |
| Burst Mode® operation | Reduces no-load buck IQ to 23µA - critical for always-on functions like Bluetooth LE or RTC backup in portable devices. |
| USB-compliant input interface | Meets USB 2.0 voltage and current limits; includes VCC undervoltage lockout and (VCC–VBAT) automatic shutdown for robust host negotiation. |
| Defective battery detection | Automatically identifies cells below 2.9V after 1.125h and pulses CHRG at 2Hz/75% duty cycle - prevents unsafe charging attempts. |
Applications
| Wireless Headsets | Bluetooth Audio Modules |
|---|---|
Use Scenario: Compact wearable device with Li-ion battery and Bluetooth radio requiring simultaneous charging and audio playback. IC Role / Device Role / Timing Role: LTC4080EDD#PBF acts as primary power manager - charging battery while powering Bluetooth SoC and codec from its 1.8V buck output. Use Value: Enables concurrent charging and operation without brownouts; Burst Mode® extends standby time to >100 hours when idle. | Use Scenario: Small-form-factor Bluetooth speaker with integrated battery and Class-D amplifier. IC Role / Device Role / Timing Role: LTC4080EDD#PBF provides regulated 3.3V rail (via FB divider) to amplifier and microcontroller while managing battery health. Use Value: Thermal regulation prevents shutdown during high-volume playback; 4.5-hour timer avoids overcharge during overnight charging. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Battery-powered music player with OLED display, flash storage, and audio DAC. IC Role / Device Role / Timing Role: LTC4080EDD#PBF delivers 500mA charge current and powers display backlight (via buck) while maintaining 4.2V float voltage. Use Value: Soft-start (180µs) eliminates display flicker at power-on; C/10 detection ensures full capacity without voltage stress. | Use Scenario: Smartwatch with heart-rate sensor, accelerometer, and BLE connectivity running on coin-cell-sized Li-ion. IC Role / Device Role / Timing Role: LTC4080EDD#PBF manages ultra-low-power charging and supplies 1.8V to MCU and sensors from buck output. Use Value: 5µA shutdown IQ preserves battery during weeks of non-use; trickle charge safely revives deeply discharged cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion charger + buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Single-input linear charger only (no integrated buck); requires external regulator for system rail; 1.5A max charge current. | Lacks integrated power conversion - adds BOM cost and board area; better suited for systems with existing 3.3V/1.8V rails. | Select when higher charge current (>500mA) is needed and buck integration is unnecessary or handled elsewhere. |
| MAX1555 | Linear charger + LDO (not buck); 100mA LDO output; no programmable charge current; fixed 4.2V float. | Lower efficiency under load due to LDO dropout; insufficient for >100mA system loads; simpler but less flexible. | Select for ultra-low-cost, low-current (<100mA) applications where efficiency and flexibility are secondary to BOM count. |
Compared with BQ24075RGTR and MAX1555, the LTC4080EDD#PBF uniquely combines 500mA charging, 300mA synchronous buck, and thermal regulation in one DFN package - reducing solution size by >40% and eliminating external regulator losses in portable battery-powered systems.
Availability
LTC4080EDD#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 LTC4080EDD#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, serving industrial, automotive, communications, and consumer markets.
The LTC4080EDD#PBF belongs to Linear's Power Management family, designed specifically for space-constrained, USB-powered portable electronics needing integrated battery charging and efficient system power conversion.
FAQ
What is the maximum charge current supported by the LTC4080EDD#PBF?
The LTC4080EDD#PBF supports a maximum charge current of 500mA with 5% accuracy, programmable via an external resistor (RPROG) connected to the PROG pin. At RPROG = 806Ω, the device delivers 500mA; lower resistance values increase current, but 500mA is the specified maximum per datasheet absolute ratings and thermal design limits. The LTC4080EDD#PBF also includes thermal regulation that automatically reduces current above ~115°C junction temperature to prevent damage.
Does the LTC4080EDD#PBF require external MOSFETs for charging or buck conversion?
No, the LTC4080EDD#PBF integrates all necessary power switches: an internal P-channel MOSFET for the linear charger (RON_CHRG = 750mΩ) and complementary PMOS/NMOS switches for the synchronous buck converter (RON_P = 0.95Ω, RON_N = 0.85Ω). No external FETs are required for either function - only passive components (inductor, capacitors, resistors) are needed to complete the circuit. This integration reduces BOM count and layout complexity for the LTC4080EDD#PBF.
How does the LTC4080EDD#PBF handle defective or deeply discharged batteries?
The LTC4080EDD#PBF implements automatic defective battery detection: if VBAT remains below 2.9V for 1.125 hours (¼ of the 4.5-hour timer), it assumes the cell is faulty and terminates charging. The CHRG pin then pulses at 2Hz with 75% duty cycle to signal failure. For deeply discharged batteries (VBAT < 2.9V), it enters trickle charge at 10% of programmed current until voltage rises above the threshold. The LTC4080EDD#PBF requires manual reset (VCC cycle or EN_CHRG toggle) to restart after defect detection.
Can the LTC4080EDD#PBF operate from a USB port without violating USB power specifications?
Yes, the LTC4080EDD#PBF is explicitly designed for USB compliance. Its VCC input accepts 3.75–5.5V, matching USB 2.0's 4.75–5.25V range. With 500mA max charge current and built-in UVLO (3.6V rising), automatic shutdown (VCC–VBAT < 32mV), and soft-start (180µs), it meets USB inrush and current-limit requirements. The ACPR pin confirms valid USB source conditions (VCC > 3.6V and VCC > VBAT + 82mV), ensuring the LTC4080EDD#PBF operates safely within USB power budgets.
What is the purpose of the MODE pin on the LTC4080EDD#PBF?
The MODE pin on the LTC4080EDD#PBF selects the buck converter's operating mode: tying it high enables Burst Mode® (23µA no-load IQ, variable frequency), while tying it low forces fixed-frequency PWM operation (2.25MHz typical). Burst Mode® maximizes light-load efficiency for battery longevity in always-on applications; PWM mode provides lower output ripple and predictable EMI for noise-sensitive circuits. The MODE pin must never be left floating - the LTC4080EDD#PBF requires explicit configuration for stable operation.
LTC4080EDD#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
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4080EDD#PBF FAQ
1.How can I place an order for LTC4080EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4080EDD#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 LTC4080EDD#PBF reliable?
The price and inventory of LTC4080EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4080EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4080EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4080EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4080EDD#PBF?
LTC4080EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4080EDD#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 LTC4080EDD#PBF?
For technical support, including LTC4080EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4080EDD#PBF requirements.
6.How does Aetrix verify that LTC4080EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4080EDD#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 LTC4080EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4080EDD#PBF?
All LTC4080EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4080EDD#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 LTC4080EDD#PBF part is unused and in its original packaging.
Return procedure for LTC4080EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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