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Analog Devices Inc. LTC4080EMSE#PBF
- Part No.:
- LTC4080EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4080EMSE#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
LTC4080EMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic Li-ion battery charger IC with integrated 300mA synchronous buck converter, designed for USB-compliant portable systems. It delivers 500mA constant-current/4.2V constant-voltage charging with thermal regulation, 4.5-hour safety timer, and C/10 charge termination detection - enabling compact, thermally robust power management in wireless headsets and Bluetooth audio devices.
For engineers reviewing the LTC4080EMSE#PBF datasheet, LTC4080EMSE#PBF pinout, LTC4080EMSE#PBF application, or LTC4080EMSE#PBF equivalent, key selection criteria include its dual-function architecture (charger + regulator), BAT-powered buck input range (2.7V–4.5V), MODE-selectable Burst Mode® (23µA no-load IQ) vs PWM (2.25MHz), and MSOP-10 exposed-pad thermal performance (θJA = 40°C/W).
Technical Context
The LTC4080EMSE#PBF integrates two independent power subsystems: a linear CC/CV charger with thermal feedback loop (TA amplifier limiting at ~115°C) and a BAT-fed synchronous buck converter featuring selectable operating modes via MODE pin. Its PROG pin servo voltage (1.0V ±2%) directly programs charge current up to 500mA with 5% accuracy, while FB pin (0.80V ±2%) sets buck output from 0.8V to VBAT.
Charge control uses three parallel feedback loops (CA for current, VA for voltage, TA for temperature), prioritized by diode steering to ensure safe transition between CC, CV, and CT modes. The buck converter employs internal PMOS/NMOS switches (RON_P = 0.95Ω, RON_N = 0.85Ω) and supports burst-mode operation below ~1mA load to achieve 23µA no-load battery current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Up to 500mA with ±5% accuracy; set by external RPROG resistor (e.g., 806Ω → 500mA) |
| Float Voltage | 4.2V ±0.5% (4.179V–4.221V); regulated via internal precision divider from BAT pin |
| Buck Output Range | 0.8V to VBAT; adjustable via external FB resistor divider; 1.8V/300mA typical application |
| Buck Input Range | 2.7V–4.5V; sourced directly from BAT pin - eliminates need for separate regulator input rail |
| Quiescent Current | 5µA shutdown (both charger & buck off); 23µA no-load in Burst Mode; 110–300µA active charger only |
| Thermal Regulation | Active junction temperature limit at ~115°C; reduces charge current dynamically without shutdown |
| Safety Timer | 4.5-hour fixed termination (3–6 hrs range); prevents overcharge during fault or low-battery conditions |
Pinout & Package
LTC4080EMSE#PBF is housed in a 10-lead plastic MSOP package with exposed pad (pin 11 = GND), 3.0mm × 3.0mm footprint, 0.75mm profile, and θJA = 40°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| 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 supply input | 3.75–5.5V USB-compatible input; UVLO at 3.6V rising / 3.0V falling |
| EN_CHRG (3) | Charger enable/disable | Pull >1.2V to disable; default-active (tie to GND if unused); controls full charger shutdown |
| PROG (4) | Charge current programming | Servo voltage = 1.0V; IBAT = 400 × VPROG/RPROG; enables real-time current monitoring |
| ACPR (5) | Power status indicator | Open-drain; pulls low when VCC > 3.6V AND (VCC – VBAT) > 82mV - confirms valid charging conditions |
| CHRG (6) | Charge status indicator | Open-drain; pulldown = charging; high-Z = C/10 reached or timer expired; 2Hz pulse = defective battery |
| FB (7) | Buck feedback input | Servo voltage = 0.80V; sets VOUT via external resistor divider; determines regulation accuracy |
| MODE (8) | Buck operating mode select | Tie to VBAT for Burst Mode (23µA IQ); tie to GND for PWM (2.25MHz); must not float |
| EN_BUCK (9) | Buck enable/disable | High = enable; low = shutdown; independent of charger state; controls 300mA output delivery |
| SW (10) | Buck switch node | Connects to inductor; requires minimal trace length and proximity to L1 for EMI/efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charger + buck converter | Single-chip solution eliminates discrete regulator and reduces BOM count by ≥6 components |
| USB-compliant input interface | Meets USB 2.0 voltage/current specs (5V±5%, 500mA max) with automatic UVLO and UVCL protection |
| Thermal feedback charge control | Dynamic current reduction at ~115°C prevents thermal runaway without interrupting charge cycle |
| C/10 charge termination detection | CHRG pin transitions to high-Z at 10% of programmed current - enables LED or MCU-based end-of-charge signaling |
| Burst Mode® efficiency optimization | 23µA no-load IQ in Burst Mode extends battery runtime in standby; seamless transition to PWM under load |
Applications
| Wireless Headsets | Bluetooth Audio Modules |
|---|---|
Use Scenario: Compact wearable device requiring simultaneous battery charging and low-noise 1.8V DSP core supply. IC Role / Device Role: LTC4080EMSE#PBF acts as primary power manager - charging single-cell Li-ion while generating clean 1.8V/300mA buck output from BAT. Use Value: Eliminates need for separate LDO or DC/DC; Burst Mode® cuts no-load current to 23µA, extending standby time between charges. | Use Scenario: Bluetooth earbud with USB-rechargeable battery and RF/baseband ICs needing stable 1.8V supply. IC Role / Device Role: LTC4080EMSE#PBF provides CC/CV charging with thermal foldback and powers baseband ICs via adjustable buck regulator. Use Value: Integrated architecture reduces PCB area by >30% vs discrete solutions; 4.5-hour timer ensures compliance with battery safety standards. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Battery-powered media player with USB charging port and audio codec requiring 3.3V or 1.8V rails. IC Role / Device Role: LTC4080EMSE#PBF manages Li-ion charging and generates auxiliary voltage via buck converter (e.g., 1.8V for DAC, 3.3V via external LDO). Use Value: Programmable charge current (up to 500mA) enables fast recharge; soft-start (180µs) limits inrush on shared USB bus. | Use Scenario: Smartwatch with small-form-factor Li-ion cell, microcontroller, and display backlight requiring ultra-low quiescent current. IC Role / Device Role: LTC4080EMSE#PBF serves as system power hub - charging battery while delivering regulated 1.8V to MCU and sensors from BAT. Use Value: 5µA shutdown IQ preserves battery during storage; exposed-pad MSOP enables efficient heat dissipation in constrained space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion charger + regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Standalone 500mA Li-ion charger only; no integrated buck converter; requires external regulator for system rail | Suitable where system voltage is derived from separate DC/DC or LDO; lacks BAT-powered regulation capability | Select MAX1555 only if buck functionality is unnecessary and board space allows discrete regulator placement |
| BQ24075 | 500mA charger with integrated 3.3V/200mA LDO (not buck); no programmable float voltage; no Burst Mode® | Best for fixed 3.3V system rails; lacks adjustable buck output and ultra-low IQ efficiency modes | Choose BQ24075 when 3.3V LDO output suffices and thermal regulation is less critical than cost |
Compared with MAX1555 and BQ24075, LTC4080EMSE#PBF uniquely combines USB-compliant charging, BAT-fed synchronous buck conversion, and Burst Mode® efficiency - making it optimal for space-constrained, battery-life-sensitive designs requiring flexible output voltage and minimal external components.
Availability
LTC4080EMSE#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 LTC4080EMSE#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC4080 series.
The LTC4080EMSE#PBF belongs to Linear's Power Management portfolio, specifically engineered for highly integrated, thermally aware battery charging in ultra-portable consumer electronics with stringent size and efficiency requirements.
FAQ
What is the maximum charge current supported by the LTC4080EMSE#PBF?
The LTC4080EMSE#PBF supports a maximum programmable charge current of 500mA with ±5% accuracy, achieved using an 806Ω resistor from PROG pin to ground. This value is confirmed in the Electrical Characteristics table under IBAT parameter (RPROG = 0.8k). Higher currents risk exceeding thermal limits or violating USB specifications, and the internal 4.5-hour timer enforces safe termination regardless of current setting.
How does the LTC4080EMSE#PBF handle thermal regulation during charging?
The LTC4080EMSE#PBF implements active thermal regulation via an internal transconductance amplifier (TA) that begins reducing charge current when junction temperature approaches ~115°C. This occurs without disabling the charger - maintaining continuous charging while preventing overheating. The PROG pin voltage remains proportional to actual delivered current, allowing real-time monitoring even under thermal foldback conditions.
Can the LTC4080EMSE#PBF operate without an external inductor?
No - the LTC4080EMSE#PBF requires an external inductor (e.g., 10µH) connected to the SW pin to enable its integrated synchronous buck converter. The buck function cannot operate without this component. However, the battery charger portion functions independently: if EN_BUCK is held low, the charger operates normally without inductor, capacitor, or feedback resistors for the buck stage.
What is the purpose of the ACPR pin on the LTC4080EMSE#PBF?
The ACPR pin on the LTC4080EMSE#PBF is an open-drain power supply status indicator. It pulls low only when both conditions are met: VCC exceeds 3.6V (UVLO threshold) and (VCC – VBAT) exceeds 82mV. This dual-condition logic confirms that sufficient input voltage and headroom exist for safe charging - providing reliable system-level power readiness signaling to host controllers or LEDs.
Does the LTC4080EMSE#PBF support trickle charging for deeply discharged batteries?
Yes - the LTC4080EMSE#PBF automatically initiates trickle charging when BAT voltage is below 2.9V at startup, delivering 10% of the programmed full-scale current (e.g., 50mA for 500mA setting). If the low voltage persists for 1.125 hours (¼ of full timer), the device declares the battery defective and pulses CHRG at 2Hz. Trickle charge resumes if BAT rises above 2.9V before timeout.
LTC4080EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC4080EMSE#PBF FAQ
1.How can I place an order for LTC4080EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4080EMSE#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 LTC4080EMSE#PBF reliable?
The price and inventory of LTC4080EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4080EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC4080EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4080EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4080EMSE#PBF?
LTC4080EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4080EMSE#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 LTC4080EMSE#PBF?
For technical support, including LTC4080EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4080EMSE#PBF requirements.
6.How does Aetrix verify that LTC4080EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4080EMSE#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 LTC4080EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC4080EMSE#PBF?
All LTC4080EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4080EMSE#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 LTC4080EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC4080EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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