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Analog Devices Inc. LTC4009CUF-1#TRPBF
- Part No.:
- LTC4009CUF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4009CUF-1#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,866
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Product details
Overview
LTC4009CUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage synchronous buck battery charger controller optimized for lithium-ion/polymer packs with 1–4 series cells. It delivers ±0.6% output voltage accuracy at 4.1V/cell, supports 6V–28V input and 2V–28V output ranges, and features programmable AC adapter current limiting with 3% accuracy-enabling high-efficiency charging in notebook computers and portable instrumentation.
For engineers reviewing the LTC4009CUF-1#TRPBF datasheet, LTC4009CUF-1#TRPBF pinout, LTC4009CUF-1#TRPBF application, or LTC4009CUF-1#TRPBF equivalent, key selection criteria include its pin-programmable 4.1V/cell float voltage, 550kHz quasi-constant-frequency PWM architecture (audible-noise-free with ceramic capacitors), analog charge current monitoring via PROG pin, and integrated ICL/CHRG/ACP status outputs for microcontroller-based charge management.
Technical Context
The LTC4009CUF-1#TRPBF implements a current-mode synchronous buck topology with external NMOS power switches (TGATE/BGATE), using ITH as the peak-current control node and PROG as both charge current programming and linearized monitoring interface. Its dual-loop regulation simultaneously manages battery voltage (via FVS0/FVS1-selectable 4.1V/cell reference) and input current (via CLP/CLN differential sensing).
Unlike self-terminating chargers, it provides no built-in termination logic-requiring external MCU supervision for full charge algorithms. The device integrates a 5V INTVDD regulator, thermal shutdown, and adaptive soft-start triggered by CLP–BAT > 100mV and ITH threshold crossing, ensuring controlled inrush during wake-up from shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.1V per cell (pin-programmed via FVS0/FVS1); enables direct compatibility with standard 1S–4S Li-ion packs without external feedback dividers. |
| Switching Frequency | 550kHz typical; allows compact 6.8µH inductors and ceramic bulk capacitors while avoiding audible noise in portable applications. |
| Voltage Accuracy | ±0.6% over temperature (C-grade); ensures tight cell balancing and prevents overvoltage stress in multi-cell configurations. |
| Charge Current Accuracy | ±4% (C-grade); determined by RPROG, RIN, and RSENSE-supports precise C-rate control for safety-critical chemistries. |
| Input Current Limit Accuracy | ±3%; set by external CLP–CLN sense resistor-maximizes power delivery from fixed-input adapters without overloading. |
| Package | 20-pin 4mm × 4mm QFN with exposed thermal pad; θJA = 37°C/W enables >2A continuous charge current with minimal heatsinking. |
| Operating Temp | 0°C to +85°C (C-grade); validated for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 20-lead (4mm × 4mm × 0.75mm) plastic QFN with exposed GND pad (Pin 21), requiring soldering to PCB thermal plane for specified thermal performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative | Differential input referenced to CLP; sets 100mV threshold for input current limiting-must be filtered to reject switching noise. |
| CLP (2) | Current limit sense positive / power rail | Primary input power source (6V–28V); supplies internal circuits and defines ICL trip point relative to CLN. |
| DCIN (3) | Backup DC input | Secondary power path isolated from CLP by diode; used when adapter is disconnected but system load remains active. |
| ICL (4) | Open-drain current limit indicator | Active-low signal asserts when charge current is reduced due to input current limiting-enables real-time power budgeting. |
| DCDIV (5) | AC adapter presence comparator input | Resistor-divider input detecting adapter presence (1.2V threshold) and overvoltage (1.825V OVP)-supports automatic source selection. |
| SHDN (6) | Active-low shutdown control | Pulled down internally (50kΩ); <300mV forces full shutdown, reducing battery leakage to <1.5µA. |
| ACP (7) | Open-drain adapter present indicator | Active-low output signaling valid adapter voltage-remains asserted across all operating states including shutdown. |
| CHRG (8) | Open-drain charge status indicator | Three-state output: strong pull-down (bulk charge), 25µA weak pull-down (C/10 detection), or high-Z (no charge)-directly interfaces with MCU GPIOs. |
| FVS0 (9) | Battery voltage select LSB | Digital input (GND/INTVDD) selecting 1S–4S output voltage; paired with FVS1 to configure 4.1V/cell for LTC4009CUF-1#TRPBF. |
| FVS1 (10) | Battery voltage select MSB | Digital input (GND/INTVDD) completing 2-bit voltage selection-FVS1=0V, FVS0=0V configures 4.1V/cell mode. |
| BAT (11) | Battery pack connection | High-side sensing node for PWM control; voltage range up to 28V supports 4S Li-ion (16.8V) and higher-voltage backup systems. |
| ITH (12) | PWM current control node | Analog voltage setting peak inductor current threshold; external RC network provides loop compensation for stability. |
| PROG (13) | Charge current programming & monitor | Resistor-to-GND sets max charge current; voltage linearly tracks actual current (11.67µA/mV)-enables real-time telemetry without ADC. |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; operates within (BAT – 50mV) to (BAT + 200mV)-supports high-side or low-side sensing layouts. |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; matched with CSN for accurate differential sensing of RSENSE voltage drop. |
| BGATE (16) | Synchronous rectifier gate driver | Drives NMOS bottom-FET in buck converter; improves efficiency >5% vs. diode rectification-requires bootstrap capacitor on BOOST. |
| INTVDD (17) | Internal 5V regulator output | Supplies TGATE/BGATE drivers; shuts down during SHDN-can power external bias circuits if current ≤20mA. |
| SW (18) | Switch node | Connection point between external inductor and power FETs; critical for EMI layout-requires minimum copper area and short traces. |
| TGATE (19) | Top-FET gate driver | Drives NMOS high-side switch; rail-to-rail swing (GND to CLN+5V) enables full enhancement of discrete MOSFETs. |
| BOOST (20) | TGATE bootstrap supply | Bootstrap capacitor node (INTVDD to SW); sustains TGATE drive during high-side conduction-requires 0.1µF ceramic capacitor. |
| GND (21) | Exposed thermal pad | Primary ground reference for analog circuits and thermal path-must be soldered to ≥2cm² PCB copper for thermal compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable 4.1V/cell output | Eliminates external feedback resistors for Li-ion 1S–4S packs-reduces BOM count and layout complexity in space-constrained designs. |
| 550kHz synchronous buck PWM | Enables use of small 6.8µH inductors and ceramic output capacitors-avoids electrolytic aging and audible coil whine in portable devices. |
| Integrated input current limiting | Prevents AC adapter overload by dynamically reducing charge current-allows concurrent system operation and battery charging without firmware intervention. |
| Analog charge current monitoring | PROG pin provides ratiometric voltage proportional to charge current-enables precise closed-loop control and SOC estimation using MCU ADC. |
| Three-state CHRG indicator | Direct hardware signaling of bulk charge, C/10 transition, and idle states-reduces MCU polling overhead and simplifies state machine implementation. |
| Micropower shutdown | Reduces battery leakage to <1.5µA-extends shelf life and standby time in always-on portable instruments and backup systems. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Charging 2S–3S Li-ion battery packs from 19V AC adapters while powering active CPU/GPU loads. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual-loop regulation (battery voltage + input current) with real-time telemetry via PROG and CHRG pins. Use Value: Maintains >90% efficiency at 2A charge current while preventing adapter brownout-enabling simultaneous compute and charging without thermal throttling. |
Use Scenario: Recharging sealed lead-acid or LiFePO₄ backup batteries in handheld test equipment with variable system load. IC Role / Device Role / Timing Role: Flexible CC/CV controller supervised by onboard MCU, using FVS0/FVS1 to configure 14.4V (4S LiFePO₄) or 13.2V (4S Li-ion) output. Use Value: Programmable input current limit (via RIN) ensures stable operation from USB-C PD or wall adapters-eliminating need for external load switches. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: Maintaining 4S Li-ion string in telecom remote units powered by solar + battery hybrid systems. IC Role / Device Role / Timing Role: High-voltage battery controller (up to 28V BAT) with DCIN/CLP dual-input arbitration and C/10 end-of-charge detection. Use Value: ±0.6% voltage accuracy prevents cell imbalance over 500+ cycles; ICL output enables dynamic power allocation between battery and RF payload. |
Use Scenario: Charging ruggedized 3S Li-ion packs in warehouse scanners operating across -20°C to +60°C ambient. IC Role / Device Role / Timing Role: Temperature-stable charger controller using external thermistor biasing on PROG pin for cold-temperature charge current derating. Use Value: C-grade specification validated from 0°C to +85°C ensures reliable start-up and full-rate charging even after cold storage-reducing field failure rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2617AGQ-Z | Integrated power FETs (no external MOSFETs required); fixed 4.2V/cell output; no input current limiting. | Targeted at cost-sensitive single-cell consumer devices-not suitable for multi-cell or adapter-limited systems. | Select when board space is constrained and 4.2V/cell suffices; avoid when input current management or 4.1V/cell precision is required. |
| BQ24725ARGER | Multi-chemistry support (Li-ion, NiCd, SLA); SMBus interface; requires external MCU for configuration-no pin-programmable voltage. | Designed for server/enterprise battery systems with complex fuel gauging and telemetry requirements. | Choose for SMBus-based centralized power management; not recommended for standalone, low-pin-count designs needing 4.1V/cell out-of-box operation. |
Compared with MP2617AGQ-Z and BQ24725ARGER, the LTC4009CUF-1#TRPBF uniquely combines pin-selectable 4.1V/cell accuracy, integrated input current limiting, and synchronous gate drivers-making it optimal for high-reliability portable equipment where adapter compatibility and cell-level voltage precision are critical.
Availability
LTC4009CUF-1#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery backup systems requiring stable component supply, long-term manufacturability, and guaranteed C-grade temperature performance.
Supply support for LTC4009CUF-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 (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 LTC4009 family was designed as a flexible, high-efficiency battery charger controller platform for multi-chemistry, multi-cell portable systems-emphasizing precision voltage regulation, input power adaptability, and seamless MCU integration.
FAQ
What battery chemistries does the LTC4009CUF-1#TRPBF support?
The LTC4009CUF-1#TRPBF supports any rechargeable chemistry-including lithium-ion, lithium-polymer, LiFePO₄, nickel-metal hydride, and sealed lead-acid-because it lacks built-in charge termination logic. Its 4.1V/cell output is optimized for Li-ion/LiPo, but the full 2V–28V output range and external MCU supervision enable safe charging of alternative chemistries with custom algorithm control.
How is the 4.1V/cell output configured on the LTC4009CUF-1#TRPBF?
The LTC4009CUF-1#TRPBF uses pins FVS0 (Pin 9) and FVS1 (Pin 10) to select its output voltage. For 4.1V/cell operation, both FVS0 and FVS1 must be tied to GND. This configuration is factory-trimmed and verified across temperature-no external resistors or calibration are needed to achieve ±0.6% accuracy.
Does the LTC4009CUF-1#TRPBF include integrated power MOSFETs?
No, the LTC4009CUF-1#TRPBF is a controller-only IC with external gate drivers (TGATE and BGATE). It requires discrete NMOS transistors for the high-side and synchronous rectifier switches. This architecture enables higher efficiency, thermal flexibility, and voltage scalability beyond integrated solutions-supporting up to 28V battery voltages.
What is the purpose of the PROG pin on the LTC4009CUF-1#TRPBF?
The PROG pin on the LTC4009CUF-1#TRPBF serves two critical functions: (1) it sets maximum charge current via an external resistor to GND, and (2) it provides a linear voltage output (11.67µA/mV) proportional to actual charge current-enabling real-time monitoring without additional sensing circuitry. This dual role simplifies design and reduces component count.
Can the LTC4009CUF-1#TRPBF operate without an external microcontroller?
The LTC4009CUF-1#TRPBF can perform basic CC/CV charging autonomously but cannot complete a full charge cycle without external supervision. It lacks built-in termination (e.g., timer cutoff, voltage plateau detection, or temperature monitoring), so an MCU or dedicated state machine is required to interpret CHRG/ICL signals and execute end-of-charge logic for safety and longevity.
LTC4009CUF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage, Reverse Current
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 16.4V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4009CUF-1#TRPBF FAQ
1.How can I place an order for LTC4009CUF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4009CUF-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 LTC4009CUF-1#TRPBF reliable?
The price and inventory of LTC4009CUF-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 LTC4009CUF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4009CUF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4009CUF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4009CUF-1#TRPBF?
LTC4009CUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4009CUF-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 LTC4009CUF-1#TRPBF?
For technical support, including LTC4009CUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4009CUF-1#TRPBF requirements.
6.How does Aetrix verify that LTC4009CUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4009CUF-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 LTC4009CUF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4009CUF-1#TRPBF?
All LTC4009CUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4009CUF-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 LTC4009CUF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4009CUF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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