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Analog Devices Inc. LTC4080XEMSE#PBF
- Part No.:
- LTC4080XEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4080XEMSE#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:158
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Product details
Overview
LTC4080XEMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic Li-ion battery charger with integrated synchronous buck regulator, delivering 500mA constant-current/constant-voltage charging and 300mA regulated output at 1.8V. It features thermal feedback, 4.5-hour safety timer, C/10 charge termination detection, and operates within USB power specifications. Designed for space-constrained portable devices like Bluetooth headsets and MP3 players.
For engineers reviewing the LTC4080XEMSE#PBF datasheet, LTC4080XEMSE#PBF pinout, LTC4080XEMSE#PBF application, or LTC4080XEMSE#PBF equivalent, key selection criteria include its dual-function integration (charger + buck), 3mm × 3mm DFN/MSE package compatibility, 4.2V float voltage accuracy, Burst Mode® vs PWM mode trade-offs, and USB-compliant input handling.
Technical Context
The LTC4080XEMSE#PBF integrates two independent power systems on one die: a linear battery charger using an internal P-channel MOSFET with three-stage regulation (constant-current, constant-voltage, constant-temperature at 115°C), and a BAT-powered synchronous buck converter with selectable 2.25MHz PWM or low-IQ Burst Mode® operation. Both subsystems share no shared control path - enabling simultaneous or independent operation.
Charge current is set via a single resistor on PROG (0.8kΩ–4kΩ), yielding 90–525mA with ±5% accuracy; buck output voltage is programmed via FB divider with 0.8V reference. The device enforces strict UVLO thresholds (3.6V on VCC, 2.7V on BAT) and includes automatic defective-battery detection (2.9V threshold, 2Hz CHRG pulsing).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Up to 500mA with ±5% accuracy; programmable via single PROG resistor; enables compact USB-powered charging without external sense resistor. |
| Battery Float Voltage | 4.2V ±0.5% (4.158V–4.242V); precision trimmed internal divider ensures safe Li-ion termination without external feedback. |
| Buck Output Current | 300mA in PWM mode; supports low-noise 1.8V rail for baseband processors or audio codecs in portable systems. |
| Buck Input Range | 2.7V–4.5V sourced directly from BAT pin; eliminates need for separate input supply to regulator. |
| Quiescent Current | 5µA in full shutdown (both charger & buck off); critical for long standby in wristwatches and wearables. |
| Thermal Regulation | Active junction temperature limiting at 115°C; dynamically reduces charge current to prevent overheating on dense PCBs. |
| Charge Termination | Programmable 4.5-hour safety timer + C/10 detection (e.g., 50mA for 500mA charge); dual redundancy meets battery manufacturer safety requirements. |
Pinout & Package
Package: 10-lead plastic MSE (MSOP-10), 0.75mm profile, exposed pad (Pin 11 = GND). Compatible with standard MSOP reflow profiles and manual soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery connection & buck input | Single node supplies both battery charging path and buck regulator input; requires low-ESR capacitor for stability and noise suppression. |
| VCC (2) | Charger input supply | Accepts 3.75–5.5V USB-compliant input; UVLO at 3.6V prevents erratic startup during weak source conditions. |
| EN_CHRG (3) | Charger enable/disable control | Logic-level input (VIH = 1.2V); pulling high disables charging and reduces IBAT to ≤2µA - essential for system-level power sequencing. |
| PROG (4) | Charge current programming & monitoring | Servo voltage held at 1.0V during CC mode; IBAT = 400 × VPROG/RPROG enables real-time current measurement without shunt. |
| ACPR (5) | Power-good status indicator | Open-drain output pulled low only when VCC > 3.6V AND (VCC – VBAT) > 82mV - confirms valid charging conditions for host MCU. |
| CHRG (6) | Charge status indicator | Three-state open-drain: low = active charge; high-Z = C/10 reached or shutdown; 2Hz pulse = defective battery (<2.9V). |
| FB (7) | Buck output voltage feedback | 0.8V reference sets VOUT = 0.8V × (1 + R1/R2); enables precise 1.8V output with standard resistor ratios. |
| MODE (8) | Buck operating mode select | Tie high for Burst Mode® (23µA no-load IBAT); tie low for fixed 2.25MHz PWM (higher efficiency at >10mA loads). |
| EN_BUCK (9) | Buck regulator enable | Independent enable allows buck to operate while charger is disabled - useful for battery-powered system wake-up rails. |
| SW (10) | Buck switch node | High-frequency switching node (up to 2.75MHz); requires minimal trace length and proximity to inductor to minimize EMI and losses. |
| GND (11) | Power and signal ground | Exposed pad must be soldered to PCB ground plane to achieve θJA = 40°C/W and ensure thermal regulation integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charger + buck in single 10-pin MSE | Reduces BOM count by ≥7 discrete components (vs separate ICs), saves >15mm² PCB area in wearable form factors. |
| Thermal feedback with 115°C junction limit | Automatically derates charge current under high ambient or poor heatsinking - eliminates need for external thermal sensors or firmware intervention. |
| Burst Mode® operation (23µA no-load IBAT) | Extends battery runtime in always-on subsystems (e.g., RTC, BLE radio) by reducing quiescent loss by 95% vs PWM mode. |
| USB-compliant input interface | Meets USB 2.0 voltage and current limits (5V±5%, 500mA max) with built-in UVLO hysteresis and automatic current limiting below VCC–VBAT = 300mV. |
| Defective battery detection (2.9V + 2Hz CHRG pulse) | Prevents unsafe charging of deeply discharged or shorted cells - avoids thermal runaway and enables host MCU fault logging. |
Applications
| Wireless Headsets | Bluetooth Audio Modules |
|---|---|
Use Scenario: Compact earbud charging case with integrated Li-ion battery and audio subsystem. IC Role / Device Role / Timing Role: LTC4080XEMSE#PBF provides primary 4.2V battery charging and powers 1.8V DSP core from same cell. Use Value: Eliminates need for separate LDO or DC/DC, reduces solution size by 30%, and enables USB-C fast-charge compatibility. |
Use Scenario: Low-power Bluetooth LE audio transmitter with battery backup and codec interface. IC Role / Device Role / Timing Role: LTC4080XEMSE#PBF delivers regulated 1.8V to Bluetooth SoC while maintaining battery health via C/10 termination. Use Value: Achieves <5µA system standby current via Burst Mode® buck and charger shutdown - extends shelf life to >12 months. |
| Portable MP3 Players | Multifunction Wristwatches |
Use Scenario: Flash-memory-based music player with OLED display and touch interface. IC Role / Device Role / Timing Role: LTC4080XEMSE#PBF charges single-cell Li-ion and supplies 1.8V to microcontroller and audio DAC. Use Value: Thermal regulation prevents display dimming or audio distortion during extended playback under warm ambient conditions. |
Use Scenario: Solar-assisted smartwatch with energy harvesting and ultra-low-power timekeeping. IC Role / Device Role / Timing Role: LTC4080XEMSE#PBF manages trickle charging from solar cell and powers real-time clock at 1.8V. Use Value: 2µA battery drain in full shutdown enables >3-year battery life with CR2032; ACPR pin validates harvest voltage before charging. |
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 regulator; requires external 1.8V LDO. | Higher BOM cost and PCB area; suitable only when system already has dedicated 1.8V rail. | Select MAX1555 if buck functionality is redundant and thermal design prioritizes simplicity over integration. |
| BQ24075 | 500mA charger with integrated 100mA LDO (not buck); fixed 3.3V output; no Burst Mode®; higher quiescent current (25µA). | Limited to low-power peripherals; cannot drive 300mA loads like audio amplifiers or displays. | Choose BQ24075 only for cost-sensitive designs where 3.3V bias rail suffices and efficiency is secondary. |
Compared with MAX1555 and BQ24075, the LTC4080XEMSE#PBF uniquely combines high-efficiency synchronous buck regulation with precision linear charging in a single MSE package - enabling smaller, cooler, and longer-lasting portable systems without compromising load capability or USB compliance.
Availability
LTC4080XEMSE#PBF is available at Aetrix Electronics and suitable for wireless headsets, portable audio players, and multifunction wristwatches requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4080XEMSE#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 ICs, serving industrial, automotive, communications, and consumer markets.
The LTC4080XEMSE#PBF belongs to Linear's Power Management family, engineered specifically for highly integrated, space-constrained portable electronics where battery charging efficiency, thermal robustness, and multi-rail power delivery must coexist in minimal footprint.
FAQ
What is the maximum continuous charge current supported by the LTC4080XEMSE#PBF?
The LTC4080XEMSE#PBF supports up to 500mA continuous constant-current charging, programmable with ±5% accuracy using a single resistor on the PROG pin. At 500mA, thermal regulation activates at ~115°C junction temperature, dynamically reducing current to maintain safe operation - verified across 0°C to 85°C ambient per datasheet Figure G04.
Can the LTC4080XEMSE#PBF operate without a battery connected?
No - the LTC4080XEMSE#PBF requires a battery connected to the BAT pin to power its integrated buck converter, as the regulator draws input from BAT (2.7V–4.5V range). Without a battery, the buck output fails even if VCC is present; however, the charger remains functional if VCC > 3.6V and EN_CHRG is asserted.
How does the CHRG pin indicate defective battery condition on the LTC4080XEMSE#PBF?
The LTC4080XEMSE#PBF pulses the CHRG pin at 2Hz with 75% duty cycle when the battery voltage remains below 2.9V for ≥1.125 hours (¼ of 4.5-hour timer). This occurs at startup if the cell is deeply discharged or shorted - distinct from normal C/10 termination, which places CHRG in high-impedance state.
What is the purpose of the ACPR pin on the LTC4080XEMSE#PBF?
The ACPR pin on the LTC4080XEMSE#PBF is an open-drain power-good indicator that pulls low only when two conditions are met: VCC exceeds 3.6V (UVLO threshold) AND (VCC – VBAT) > 82mV. It signals to the host system that input power is sufficient for safe charging - enabling reliable system boot sequencing and fault detection.
Does the LTC4080XEMSE#PBF support USB suspend mode compliance?
Yes - the LTC4080XEMSE#PBF complies with USB 2.0 suspend requirements via its dual UVLO architecture: VCC undervoltage lockout at 3.6V (with 0.6V hysteresis) and automatic shutdown when (VCC – VBAT) falls below 82mV. In suspend, total supply current drops to ≤10µA and battery drain to ≤5µA, meeting USB specification limits.
LTC4080XEMSE#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/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-MSOP-EP
LTC4080XEMSE#PBF FAQ
1.How can I place an order for LTC4080XEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4080XEMSE#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 LTC4080XEMSE#PBF reliable?
The price and inventory of LTC4080XEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4080XEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC4080XEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4080XEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4080XEMSE#PBF?
LTC4080XEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4080XEMSE#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 LTC4080XEMSE#PBF?
For technical support, including LTC4080XEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4080XEMSE#PBF requirements.
6.How does Aetrix verify that LTC4080XEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4080XEMSE#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 LTC4080XEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC4080XEMSE#PBF?
All LTC4080XEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4080XEMSE#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 LTC4080XEMSE#PBF part is unused and in its original packaging.
Return procedure for LTC4080XEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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