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Analog Devices Inc. LTC4009IUF-1#TRPBF
- Part No.:
- LTC4009IUF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4009IUF-1#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,164
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Product details
Overview
LTC4009IUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller optimized for lithium-ion/polymer battery 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, features 550kHz quasi-constant-frequency PWM, and enables external AC adapter current limiting via programmable sense resistor. It is used in notebook computers and portable instruments requiring precise, noise-free charging control.
For engineers reviewing the LTC4009IUF-1#TRPBF datasheet, LTC4009IUF-1#TRPBF pinout, LTC4009IUF-1#TRPBF application, or LTC4009IUF-1#TRPBF equivalent, key selection criteria include its pin-programmable 4.1V/cell float voltage, ±4% charge current accuracy, 3% input current limit accuracy, thermally enhanced 4mm × 4mm QFN package, and compatibility with ceramic bulk capacitors to eliminate audible noise.
Technical Context
The LTC4009IUF-1#TRPBF implements a current-mode synchronous buck topology with fixed 550kHz switching frequency and adaptive soft-start. Its dual-loop control integrates battery voltage regulation (via FVS0/FVS1 digital inputs selecting 4.1V/cell), charge current regulation (via PROG/CSP/CSN sensing), and AC adapter input current limiting (via CLP/CLN differential sensing).
It uses an internal 5V INTVDD regulator to drive external NFETs (TGATE/BGATE), includes analog charge current monitoring on PROG, and provides three open-drain status outputs (CHRG, ICL, ACP) with multi-level signaling - including C/10 detection and active-low input current limit indication - all operating across –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.1V per cell (pin-programmed via FVS0/FVS1); enables direct support for 1–4S Li-ion packs without external divider. |
| Charge Current Accuracy | ±4% (typical); ensures predictable full-scale current setting using RPROG and RSENSE, critical for safe battery conditioning. |
| Input Current Limit Accuracy | ±3%; allows precise adapter power budgeting by reducing charge current before overloading the DC source. |
| Switching Frequency | 550kHz (typical); enables compact magnetics and low-ESR ceramic capacitor use while avoiding audible noise. |
| Operating Temperature | –40°C to +125°C (I-grade); qualified for industrial and extended-temperature embedded systems. |
| Package | 20-pin 4mm × 4mm × 0.75mm QFN with exposed thermal pad; achieves θJA = 37°C/W for high-power charging applications. |
| Voltage Regulation Accuracy | ±0.6% (over temp); maintains tight cell voltage tolerance essential for Li-ion longevity and safety compliance. |
Pinout & Package
20-pin (4mm × 4mm) plastic QFN package with exposed GND pad (Pin 21) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative | Differential input referenced to CLP; sets 100mV threshold for adapter current limiting. |
| CLP (2) | Current limit sense positive / power input | Primary DC adapter supply input; powers internal circuits and defines current limit reference. |
| DCIN (3) | DC input supply | Isolated auxiliary DC source input; bypassed with ≥0.1µF capacitor for stability. |
| ICL (4) | Input current limit indicator | Open-drain output active-low when charge current is reduced due to adapter current limit. |
| DCDIV (5) | AC adapter presence comparator input | Resistor-divider input detecting adapter presence (1.2V threshold) and overvoltage (1.825V OVP). |
| SHDN (6) | Active-low shutdown control | Pulled down internally (50kΩ); <300mV forces shutdown, reducing battery leakage to ≤1.5µA. |
| ACP (7) | AC adapter present indicator | Open-drain output active-low when adequate adapter voltage is detected at DCDIV. |
| CHRG (8) | Charge status indicator | Three-state open-drain: strong pull-down (bulk charge), 25µA weak pull-down (C/10), high-Z (no charge). |
| FVS0 (9) | Battery voltage select (LSB) | Digital input (GND/INTVDD) selecting one of four preset float voltages (4.1V/cell for LTC4009IUF-1#TRPBF). |
| FVS1 (10) | Battery voltage select (MSB) | Digital input (GND/INTVDD) paired with FVS0 to configure 4.1V/cell output for Li-ion 1–4S packs. |
| BAT (11) | Battery pack connection | Main battery voltage feedback node; drives FBDIV during charge and enables C/10 detection logic. |
| ITH (12) | PWM control voltage / compensation | Error amplifier output setting peak inductor current; external RC network stabilizes current/voltage loops. |
| PROG (13) | Charge current programming & monitor | Analog output proportional to actual charge current; used for programming (RPROG) and real-time monitoring. |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; operates within (BAT – 50mV) to (BAT + 200mV) range. |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; matched with CSN for accurate differential sensing. |
| BGATE (16) | Synchronous rectifier gate driver | Drives external NMOS for low-loss synchronous rectification; improves efficiency vs. diode-based designs. |
| INTVDD (17) | Internal 5V regulator output | Supplies gate drivers; shuts down in SHDN mode; can power external circuitry up to 20mA load. |
| SW (18) | Switch node | Connection point between external inductor and power FETs; critical for EMI and layout; referenced to TGATE/BOOST. |
| TGATE (19) | Top-side NFET gate driver | Drives external high-side NMOS switch; rail-to-rail swing up to (CLN + 5V) enables efficient high-side drive. |
| BOOST (20) | TGATE bootstrap supply | Bootstrap capacitor return node; charges from SW/INTVDD to enable high-side NMOS gate drive above CLN. |
| GND (21) | Ground / thermal pad | Exposed paddle; must be soldered to PCB ground plane for thermal management (θJA = 37°C/W) and reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| No-audible-noise operation | Quasi-constant 550kHz PWM enables full use of low-ESR ceramic capacitors without piezoelectric whine. |
| Digital battery voltage selection | FVS0/FVS1 pins directly configure 4.1V/cell output for Li-ion 1–4S packs - eliminating external resistor dividers and trimming. |
| Adaptive input current limiting | Reduces charge current in real time to maintain fixed adapter power draw, enabling concurrent system operation and charging. |
| Multi-level CHRG status signaling | Three-state open-drain output conveys bulk charge, C/10 termination, and input-limited states without external logic. |
| Thermally robust QFN package | 4mm × 4mm exposed-pad QFN delivers 37°C/W junction-to-ambient thermal resistance for sustained 3A+ charging. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Charging multi-cell Li-ion battery packs in space-constrained laptops with simultaneous system operation. IC Role / Device Role / Timing Role: Synchronous buck controller managing constant-current/constant-voltage charge profile under MCU supervision. Use Value: 550kHz switching enables small inductors and ceramic capacitors; ±0.6% voltage accuracy extends battery cycle life. | Use Scenario: Rechargeable handheld test equipment requiring reliable, low-noise charging in field-deployed environments. IC Role / Device Role / Timing Role: High-efficiency battery charger controller interfacing with host microcontroller for algorithmic charge management. Use Value: –40°C to +125°C operation ensures reliability in outdoor/industrial conditions; ICL output prevents adapter overload during peak loads. |
| Battery Backup Systems | Medical Portable Devices |
Use Scenario: Maintaining standby power in UPS or telecom backup units with Li-ion or LiFePO₄ battery banks. IC Role / Device Role / Timing Role: Flexible charger controller supporting multiple chemistries via external MCU control and no built-in termination. Use Value: Wide 2V–28V output range accommodates diverse battery configurations; PROG pin enables real-time current telemetry. | Use Scenario: Charging sealed medical devices (e.g., portable monitors) where silent operation and precise voltage control are mandatory. IC Role / Device Role / Timing Role: Low-noise, high-accuracy battery charger IC ensuring compliance with IEC 60601-1 leakage and safety requirements. Use Value: Ceramic-capacitor compatibility eliminates audible noise; ±4% charge current accuracy supports strict battery health protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4009IUF-2#TRPBF | 4.2V/cell output (vs. 4.1V/cell); identical pinout, package, and specs otherwise. | Designed for standard 4.2V/cell Li-ion chemistry; not suitable for 4.1V/cell or LFP chemistries requiring lower float voltage. | Select LTC4009IUF-2#TRPBF only when targeting conventional Li-ion cells with 4.2V termination. |
| BQ24725ARHBT | TI part with integrated MOSFET drivers, SMBus interface, and built-in safety timers; requires external MCU communication. | Supports autonomous charge termination and fault logging; adds protocol overhead but reduces firmware complexity. | Choose BQ24725ARHBT when SMBus-controlled, self-contained charging with safety timers is required over pure analog flexibility. |
Compared with LTC4009IUF-2#TRPBF, the LTC4009IUF-1#TRPBF provides tighter voltage margin for aging Li-ion cells and longer cycle life; versus BQ24725ARHBT, it offers simpler analog control and no communication dependency but requires full external algorithm implementation.
Availability
LTC4009IUF-1#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC4009IUF-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.
The LTC4009 family was designed as a flexible, high-accuracy battery charger controller platform for multi-chemistry, multi-cell applications - emphasizing precision voltage/current regulation, thermal efficiency, and seamless integration with host microcontrollers.
FAQ
What is the exact float voltage output of the LTC4009IUF-1#TRPBF?
The LTC4009IUF-1#TRPBF is factory-configured to deliver 4.1V per cell for lithium-ion/polymer battery packs with 1–4 series cells. This value is set digitally via internal precision resistors controlled by the FVS0 and FVS1 pins, achieving ±0.6% accuracy over the full –40°C to +125°C operating range. It does not require external resistor dividers.
How does the LTC4009IUF-1#TRPBF handle input current limiting from an AC adapter?
The LTC4009IUF-1#TRPBF uses differential sensing on CLP and CLN pins to monitor adapter current via an external sense resistor. When the voltage drop reaches ~100mV, it reduces charge current to maintain the programmed input limit. The ICL pin goes active-low to signal this condition, and the PROG pin reflects the reduced current in real time.
Can the LTC4009IUF-1#TRPBF be used with battery chemistries other than lithium-ion?
Yes, the LTC4009IUF-1#TRPBF supports multi-chemistry charging because it has no built-in termination logic. Its constant-current/constant-voltage architecture, wide 2V–28V output range, and external control interface make it suitable for LiFePO₄, NiMH, and lead-acid batteries when paired with an external microcontroller that implements the appropriate charge algorithm.
What is the purpose of the PROG pin on the LTC4009IUF-1#TRPBF?
On the LTC4009IUF-1#TRPBF, the PROG pin serves two functions: (1) it programs maximum charge current via an external resistor (RPROG) to ground, and (2) it provides an analog voltage output linearly proportional to actual charge current - enabling real-time monitoring without additional circuitry.
Does the LTC4009IUF-1#TRPBF require external MOSFETs, and why?
Yes, the LTC4009IUF-1#TRPBF requires external high-side (TGATE) and synchronous rectifier (BGATE) NMOS FETs. As a controller-not a fully integrated charger-it relies on external power switches to achieve high efficiency, thermal scalability, and flexibility in voltage/current ratings beyond monolithic IC limitations.
LTC4009IUF-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4009IUF-1#TRPBF FAQ
1.How can I place an order for LTC4009IUF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4009IUF-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 LTC4009IUF-1#TRPBF reliable?
The price and inventory of LTC4009IUF-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 LTC4009IUF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4009IUF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4009IUF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4009IUF-1#TRPBF?
LTC4009IUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4009IUF-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 LTC4009IUF-1#TRPBF?
For technical support, including LTC4009IUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4009IUF-1#TRPBF requirements.
6.How does Aetrix verify that LTC4009IUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4009IUF-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 LTC4009IUF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4009IUF-1#TRPBF?
All LTC4009IUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4009IUF-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 LTC4009IUF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4009IUF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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