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Analog Devices Inc. LTC4050EMS-4.1#PBF
- Part No.:
- LTC4050EMS-4.1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4050EMS-4.1#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
LTC4050EMS-4.1#PBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC for single-cell 4.1V systems, featuring ±1% float voltage accuracy, programmable charge current up to 500mA, thermistor-based temperature supervision (0°C–50°C), and automatic trickle/constant-current/constant-voltage charging sequence. It is used in portable electronics requiring safe, autonomous Li-Ion charging without microcontroller intervention.
For engineers reviewing the LTC4050EMS-4.1#PBF datasheet, LTC4050EMS-4.1#PBF pinout, LTC4050EMS-4.1#PBF application, or LTC4050EMS-4.1#PBF equivalent, key selection criteria include its 10-pin MSOP package, 4.5V–10V input range, 5µA sleep-mode battery drain, C/10 end-of-charge detection, and thermistor interface compatibility with 10kΩ NTCs (e.g., Dale NTHS-1206N02).
Technical Context
The LTC4050EMS-4.1#PBF implements a precision analog control loop using an internal 2.47V reference, current amplifier, and voltage amplifier to regulate both charge current (via external RPROG and RSENSE) and float voltage (4.1V ±1%). Its thermistor interface uses internal 28.6kΩ biasing and dual comparators to enforce 0°C–50°C charging windows by disabling charge and freezing timer count upon fault detection.
Charge sequencing is fully autonomous: it initiates trickle charge below 2.49V, transitions to constant-current mode above that threshold, terminates at C/10 (10% of programmed current), and reinitiates charging when battery voltage drops below 3.88V after full charge. The TIMER pin supports programmable timeout via external capacitor (e.g., 0.1µF = 3 hours), while PROG pin floating enables shutdown with 3.6V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±1% - ensures precise Li-Ion cell termination to prevent overvoltage stress and maximize cycle life. |
| Charge Current Range | 60mA–535mA - set by RPROG/RSENSE combination; e.g., RPROG=19.6kΩ + RSENSE=0.2Ω yields 500mA nominal. |
| Input Voltage Range | 4.5V–10V - compatible with standard wall adapters and USB-powered supplies with sufficient headroom. |
| Sleep Mode Drain | 5µA max - minimizes battery self-discharge when input supply is removed, extending standby time. |
| Thermistor Temp Range | 0°C to 50°C - enforced via NTC interface; suspends charging outside this window to prevent thermal damage. |
| C/10 Detection | Yes - internal comparator signals near-end-of-charge at 10% of full-scale current for reliable termination. |
| Recharge Threshold | 3.88V - triggers new charge cycle automatically when battery self-discharges below this level. |
Pinout & Package
Package: 10-pin MSOP (3mm × 3mm, 0.5mm pitch), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects directly to Li-Ion cell anode; internal resistor divider sets 4.1V float point and disconnects in sleep mode to reduce drain. |
| NTC (2) | Thermistor interface input | Biased by internal 28.6kΩ resistor; compares against VCC/2 and VCC/8 thresholds to detect 0°C/50°C faults. |
| CHRG (3) | Open-drain charge status output | Pulled low during fast charge; switches to 32µA weak pull-down at C/10; goes high-Z at timeout or sleep. |
| TIMER (4) | Timer capacitor connection | External CTIMER sets total charge time (t = 3h × CTIMER/0.1µF); shorting to GND disables timer. |
| GND (5) | Power and signal ground reference | Common return path for all internal circuits and external components; must be low-impedance. |
| PROG (6) | Charge current programming/shutdown input | RPROG to GND sets IBAT; floating PROG pulls up via 2.3µA source to 3.6V shutdown threshold. |
| DRV (7) | External pass device drive output | High-impedance output driving gate/base of P-MOSFET or high-gain PNP; no internal driver transistor. |
| VCC (8) | Positive input supply | 4.5V–10V input; bypassed with ≥1µF capacitor; UVLO activates below 4.5V with 130mV hysteresis. |
| SENSE (9) | Current sense input | Connects to RSENSE between VCC and SENSE; develops ~100mV at full-scale current for accurate regulation. |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > 4V and VCC–VBAT ≥ 54mV; sinks 5mA for LED drive. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous charge sequencing | Trickle → constant-current → constant-voltage → C/10 termination → auto-recharge at 3.88V, no firmware required. |
| ±1% float voltage accuracy | Guaranteed over –40°C to 85°C using trimmed 2.47V reference and precision resistor divider on BAT pin. |
| Thermistor-based thermal safety | Dual-comparator NTC interface enforces 0°C–50°C charging window with hysteresis; disables charge and freezes timer on fault. |
| Low-power sleep mode | 5µA battery drain when input removed - achieved by disconnecting BAT divider and disabling internal bias currents. |
| Programmable charge termination | Timer-based (external CTIMER) or C/10 detection; both methods supported simultaneously for robustness. |
Applications
| Smartphones | Handheld Medical Devices |
|---|---|
Use Scenario: Compact, battery-powered smartphone with single-cell Li-Ion pack requiring safe, autonomous charging from USB or wall adapter. IC Role / Device Role / Timing Role: Standalone linear charger controller managing full CC/CV profile, thermistor monitoring, and recharge initiation. Use Value: Eliminates need for host MCU supervision; ±1% voltage accuracy extends battery cycle life; 5µA sleep drain preserves standby time. | Use Scenario: Portable ECG monitor or glucose meter operating on a single Li-Ion cell, deployed in clinical or home settings. IC Role / Device Role / Timing Role: Safety-critical battery management unit enforcing strict 0°C–50°C charging limits and reliable C/10 termination. Use Value: Prevents thermal runaway during charging; automatic trickle mode recovers deeply discharged cells; ACPR pin confirms power source presence. |
| Wearable Fitness Trackers | Industrial Handheld Scanners |
Use Scenario: Ultra-thin wearable with space-constrained PCB and small-capacity Li-Ion battery (<500mAh). IC Role / Device Role / Timing Role: Space-optimized charging solution in 10-pin MSOP, supporting low-current profiles and battery insertion detection. Use Value: 3mm × 3mm footprint saves board area; automatic battery detection restarts charge on replacement; low quiescent current extends shelf life. | Use Scenario: Ruggedized barcode scanner used in warehouses with frequent battery swaps and variable ambient temperatures. IC Role / Device Role / Timing Role: Robust charging controller tolerant of intermittent input, battery hot-swap, and wide temperature operation. Use Value: Recharge threshold (3.88V) prevents premature cycling; thermistor interface adapts to warehouse thermal zones; MSOP package withstands mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4050EMS-4.2#PBF | Identical architecture and pinout; differs only in float voltage (4.2V vs 4.1V) and corresponding recharge threshold (3.98V vs 3.88V). | Used where battery chemistry requires 4.2V termination (e.g., standard Li-CoO₂ cells), not 4.1V (e.g., some Li-MnO₂ or long-life variants). | Select based on battery manufacturer's specified float voltage; otherwise, functionally interchangeable with layout unchanged. |
| LTC1731EMS-4.2#PBF | Also 8-pin MSOP; lacks thermistor interface and automatic recharge; uses fixed 4.2V float and simpler timer-only termination. | Suitable for cost-sensitive designs where thermal monitoring is omitted and battery replacement is infrequent. | Choose when thermistor safety is unnecessary and board space allows trade-off of features for lower BOM cost. |
Compared with LTC4050EMS-4.1#PBF, the LTC4050EMS-4.2#PBF offers identical functionality with higher float voltage for standard Li-Ion cells, while the LTC1731EMS-4.2#PBF reduces feature set (no NTC, no auto-recharge) to lower complexity and cost - making the LTC4050EMS-4.1#PBF optimal for thermally aware, maintenance-free portable devices.
Availability
LTC4050EMS-4.1#PBF is available at Aetrix Electronics and suitable for smartphones, handheld medical devices, wearables, and industrial scanners requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC4050EMS-4.1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4050EMS-4.1#PBF belongs to Linear's legacy battery management product line, designed specifically for compact, autonomous, single-cell Li-Ion charging in space- and safety-constrained portable electronics.
FAQ
What is the exact float voltage specification for the LTC4050EMS-4.1#PBF?
The LTC4050EMS-4.1#PBF provides a regulated float voltage of 4.1V with ±1% accuracy over the full operating temperature range (–40°C to 85°C) and input voltage range (5V ≤ VCC ≤ 10V). This value is factory-trimmed and guaranteed per the Electrical Characteristics table in the official datasheet, ensuring compliance with 4.1V Li-Ion cell requirements.
How does the thermistor interface on the LTC4050EMS-4.1#PBF enforce temperature limits?
The LTC4050EMS-4.1#PBF uses its NTC pin with an internal 28.6kΩ bias resistor to compare thermistor resistance against two thresholds derived from VCC/2 and VCC/8. When resistance corresponds to <0°C (~28.5kΩ) or >50°C (~4.1kΩ), the comparators disable charging, freeze the timer, and turn off the current amplifier - halting all battery current flow until temperature returns to the valid window.
Can the LTC4050EMS-4.1#PBF automatically restart charging after battery voltage drops post-full-charge?
Yes. The LTC4050EMS-4.1#PBF monitors battery voltage continuously and initiates a new charge cycle when VBAT falls below 3.88V - the recharge threshold for 4.1V cells. This occurs due to self-discharge or load-induced sag, enabling maintenance-free operation without external intervention or host MCU polling.
What is the minimum external component count required to implement basic charging with the LTC4050EMS-4.1#PBF?
A functional LTC4050EMS-4.1#PBF charger requires at minimum: one P-channel MOSFET (or high-gain PNP), one sense resistor (RSENSE), one program resistor (RPROG), one timer capacitor (CTIMER), one 1µF VCC bypass capacitor, one 10µF BAT bypass capacitor, and a 10kΩ NTC thermistor. No external diodes, op-amps, or microcontrollers are needed.
Does the LTC4050EMS-4.1#PBF support USB input power sources?
Yes - the LTC4050EMS-4.1#PBF accepts input voltages from 4.5V to 10V, covering standard 5V USB power supplies. Its ACPR pin indicates adapter presence, and its undervoltage lockout (4.5V threshold) ensures stable operation even with marginal USB sources. However, USB current limits must be respected externally, as the IC itself draws only ~1.3mA in active mode.
LTC4050EMS-4.1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 10V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC4050EMS-4.1#PBF FAQ
1.How can I place an order for LTC4050EMS-4.1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4050EMS-4.1#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 LTC4050EMS-4.1#PBF reliable?
The price and inventory of LTC4050EMS-4.1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4050EMS-4.1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4050EMS-4.1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4050EMS-4.1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4050EMS-4.1#PBF?
LTC4050EMS-4.1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4050EMS-4.1#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 LTC4050EMS-4.1#PBF?
For technical support, including LTC4050EMS-4.1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4050EMS-4.1#PBF requirements.
6.How does Aetrix verify that LTC4050EMS-4.1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4050EMS-4.1#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 LTC4050EMS-4.1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4050EMS-4.1#PBF?
All LTC4050EMS-4.1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4050EMS-4.1#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 LTC4050EMS-4.1#PBF part is unused and in its original packaging.
Return procedure for LTC4050EMS-4.1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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