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Analog Devices Inc. LTC4050EMS-4.1#TRPBF
- Part No.:
- LTC4050EMS-4.1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4050EMS-4.1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
LTC4050EMS-4.1#TRPBF 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 compact portable electronics requiring precise, low-quiescent-power charging control.
For engineers reviewing the LTC4050EMS-4.1#TRPBF datasheet, LTC4050EMS-4.1#TRPBF pinout, LTC4050EMS-4.1#TRPBF application, or LTC4050EMS-4.1#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternatives, and supply-ready procurement support - all grounded in the official LTC4050-4.1 datasheet and Linear Technology reference designs.
Technical Context
The LTC4050EMS-4.1#TRPBF implements a precision analog control loop using an internal 2.47V reference, current amplifier (CA), and voltage amplifier (VA) 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 with ~10mV hysteresis to enforce 0°C–50°C charging windows via NTC resistance thresholds (RCOLD ≈28.5kΩ, RHOT ≈4.1kΩ).
Charge termination combines C/10 detection (10% of programmed current) and a capacitor-programmable timer (tTIMER = CTIMER × 3h / 0.1µF), while sleep mode reduces battery drain to 5µA when VCC is removed or falls within 54mV of VBAT. Automatic recharge triggers at VBAT ≤3.88V after self-discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±1% (ensures safe, accurate Li-Ion cell termination without overvoltage stress) |
| Max Charge Current | 500mA (programmable via RPROG/RSENSE; supports 1C charging for typical 500mAh cells) |
| Thermistor Range | 0°C to 50°C (enforced via NTC resistance thresholds: RCOLD ≈28.5kΩ, RHOT ≈4.1kΩ) |
| Sleep Mode Drain | 5µA (minimizes battery self-discharge during adapter removal or standby) |
| Input Voltage Range | 4.5V to 10V (compatible with standard 5V/9V wall adapters and USB PD sources) |
| C/10 Detection | Active at 10% of full-scale current (e.g., 50mA for 500mA program; signals near-full charge) |
| Recharge Threshold | 3.88V (restarts charging after battery self-discharge; prevents premature cutoff) |
| Undervoltage Lockout | 4.5V (VUV) with 130mV hysteresis (prevents unstable operation during brownout) |
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 regulation point and disconnects in sleep mode to reduce drain |
| NTC (2) | Thermistor interface input | Bias input for 10kΩ NTC (e.g., Dale NTHS-1206N02); enables thermal fault suspension below 0°C or above 50°C |
| CHRG (3) | Open-drain charge status output | Pulled low during fast charge; transitions to 32µA weak pull-down at C/10; high-Z after timeout or shutdown |
| TIMER (4) | Timer capacitor and CV disable input | CTIMER sets total charge time (t = CTIMER × 3h / 0.1µF); shorted to GND disables timer and C/10 |
| GND (5) | Analog/digital ground reference | Common return for all internal circuits and external RSENSE; must be low-impedance |
| PROG (6) | Charge current programming and shutdown input | RPROG to GND sets IBAT = (2.47V × 800Ω)/(RPROG × RSENSE); floating forces shutdown via 2.3µA current source |
| DRV (7) | External pass device drive output | High-impedance gate/base driver for P-channel MOSFET or high-gain PNP; no internal pull-up/down |
| VCC (8) | Positive input supply | 4.5V–10V input; powers all circuitry; bypass with ≥1µF ceramic capacitor |
| SENSE (9) | Current sense input | Connects to RSENSE between VCC and SENSE; senses voltage drop to regulate IBAT |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > 4V and VCC − VBAT ≥ 54mV; sinks 5mA for LED indication |
Key Features
| Feature | Design Value |
|---|---|
| ±1% float voltage accuracy | Guarantees safe 4.1V termination across temperature and line variations, eliminating need for post-production calibration |
| Programmable C/10 detection | Enables reliable end-of-charge signaling independent of battery aging or impedance shift |
| Automatic trickle-to-CC-CV transition | Resumes charging at 10% current if cell voltage <2.49V, preventing damage to deeply discharged Li-Ion cells |
| Thermistor-based thermal fault hold | Suspends charging and freezes timer when NTC indicates out-of-range temperature, preserving battery health |
| Low 5µA sleep-mode battery drain | Extends shelf life and runtime in always-connected portable devices by minimizing parasitic discharge |
| Integrated ACPR wall-adapter detection | Provides system-level power-source awareness without external comparators or logic |
Applications
| Smart Wearables | Medical Sensors |
|---|---|
Use Scenario: Rechargeable wrist-worn ECG monitor with 300mAh Li-Ion cell, operating 72h between charges and requiring thermal-safe overnight charging. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, NTC-based thermal supervision, and automatic recharge at 3.88V. Use Value: Eliminates microcontroller intervention for charging control while ensuring compliance with IEC 62368-1 thermal safety limits. | Use Scenario: Disposable Bluetooth-enabled glucose meter with integrated 150mAh Li-Ion battery, charged via micro-USB during clinic docking. IC Role / Device Role / Timing Role: Primary charge controller enforcing 4.1V float, C/10 termination, and 5µA sleep drain to maximize battery shelf life pre-deployment. Use Value: Reduces BOM count by replacing discrete op-amps, comparators, and timers with a single validated analog solution. |
| Industrial Handhelds | Portable Test Equipment |
Use Scenario: Rugged barcode scanner used in warehouse environments (−10°C to 45°C), powered by 800mAh Li-Ion and dock-charged nightly. IC Role / Device Role / Timing Role: Battery management unit providing temperature-compensated charging, undervoltage lockout, and battery insertion detection. Use Value: Prevents charging below 0°C in cold storage areas, avoiding irreversible capacity loss in Li-Ion cells. | Use Scenario: Battery-powered oscilloscope module with 2000mAh Li-Ion pack, requiring stable 4.1V termination and minimal quiescent drain during field calibration. IC Role / Device Role / Timing Role: Precision analog charger delivering ±1% voltage regulation and automatic sleep mode when AC adapter is unplugged. Use Value: Maintains >98% state-of-charge accuracy over 500 cycles, critical for traceable metrology-grade instruments. |
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#TRPBF | Fixed 4.2V float voltage (vs. 4.1V); identical pinout, timing, and thermistor interface | Designed for standard 4.2V Li-Ion cells; not suitable for 4.1V chemistries requiring tighter voltage margin | Select only if battery specification mandates 4.2V termination; otherwise, LTC4050EMS-4.1#TRPBF ensures optimal longevity for 4.1V-rated cells. |
| LTC1731EMS-4.2#TRPBF | Same 10-pin MSOP package but lacks thermistor interface; uses fixed 4.2V float and simpler timer-only termination | Targeted at cost-sensitive applications where thermal monitoring is omitted; no NTC pin or cold/hot fault logic | Choose when thermal safety is handled externally or unnecessary; LTC4050EMS-4.1#TRPBF adds essential in-situ temperature enforcement. |
Compared with LTC4050EMS-4.2#TRPBF, the LTC4050EMS-4.1#TRPBF provides tighter voltage margin for extended cycle life in 4.1V Li-Ion systems, while LTC1731EMS-4.2#TRPBF trades thermal protection for reduced component count - making LTC4050EMS-4.1#TRPBF the sole choice for thermally constrained, safety-critical portable designs.
Availability
LTC4050EMS-4.1#TRPBF is available at Aetrix Electronics and suitable for smart wearables, medical sensors, industrial handhelds, portable test equipment, and battery-powered IoT edge nodes requiring stable component supply, long-term lifecycle assurance, and guaranteed RoHS-compliant sourcing.
Supply support for LTC4050EMS-4.1#TRPBF 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, serving industrial, automotive, communications, and healthcare markets.
The LTC4050EMS-4.1#TRPBF belongs to Linear's legacy LTC® battery management portfolio, engineered specifically for space-constrained, thermally aware portable electronics needing fully autonomous, analog-precision Li-Ion charging without firmware or host intervention.
FAQ
What is the exact float voltage tolerance of the LTC4050EMS-4.1#TRPBF?
The LTC4050EMS-4.1#TRPBF guarantees a regulated float voltage of 4.1V with ±1% accuracy (4.059V to 4.141V) across the full operating temperature range (−40°C to 85°C) and input voltage range (5V ≤ VCC ≤ 10V), as specified in the official Linear Technology datasheet Section "Electrical Characteristics".
How does the LTC4050EMS-4.1#TRPBF handle deeply discharged batteries?
The LTC4050EMS-4.1#TRPBF automatically initiates trickle charging at 10% of the programmed current when the battery voltage is below 2.49V. This low-current mode continues until the cell voltage exceeds 2.49V, after which it transitions to constant-current charging - protecting damaged or over-discharged Li-Ion cells from thermal runaway.
Can the LTC4050EMS-4.1#TRPBF be used with non-Dale NTC thermistors?
Yes - the LTC4050EMS-4.1#TRPBF supports any 10kΩ NTC thermistor with a room-temperature beta (β) value near 3400, including BetaCHIP Curve 7 and other equivalents. The internal 28.6kΩ bias and comparator thresholds (RCOLD ≈28.5kΩ, RHOT ≈4.1kΩ) are calibrated for this beta range, ensuring accurate 0°C–50°C window enforcement.
What happens to the CHRG pin during different charge states of the LTC4050EMS-4.1#TRPBF?
During fast charging, the CHRG pin is actively pulled low by an internal N-channel MOSFET. At C/10 (10% of full current), it switches to a 32µA weak pull-down to ground. After timer timeout or shutdown, CHRG becomes high-impedance - enabling three-state microprocessor detection (charging, near-full, stopped) using dual pull-up resistors per Figure 1 in the datasheet.
Is the LTC4050EMS-4.1#TRPBF compatible with PNP transistors as the pass element?
Yes - the DRV pin drives either a P-channel MOSFET or a high-gain Darlington PNP transistor (e.g., ZTX749). When using PNP, a 1000pF capacitor from DRV to VCC is required for stability, and base current error must be minimized: gain <100 introduces measurable charge current inaccuracy per the datasheet's CA gain analysis (≈0.6µA/mV).
LTC4050EMS-4.1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4050EMS-4.1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4050EMS-4.1#TRPBF 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#TRPBF reliable?
The price and inventory of LTC4050EMS-4.1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4050EMS-4.1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4050EMS-4.1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4050EMS-4.1#TRPBF?
LTC4050EMS-4.1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4050EMS-4.1#TRPBF 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#TRPBF?
For technical support, including LTC4050EMS-4.1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4050EMS-4.1#TRPBF requirements.
6.How does Aetrix verify that LTC4050EMS-4.1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4050EMS-4.1#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4050EMS-4.1#TRPBF?
All LTC4050EMS-4.1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4050EMS-4.1#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC4050EMS-4.1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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