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Analog Devices Inc. LTC4009IUF#TRPBF
- Part No.:
- LTC4009IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4009IUF#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,435
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Product details
Overview
LTC4009IUF#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down constant-current/constant-voltage battery charger controller for multi-chemistry batteries. It delivers ±0.5% float voltage accuracy, 4% charge current accuracy, and operates at 550kHz with no audible noise using ceramic capacitors. Designed for notebook computers and portable instruments, it supports wide input (6V–28V) and output (2V–28V) voltage ranges while enabling external microcontroller-based charge termination.
For engineers reviewing the LTC4009IUF#TRPBF datasheet, LTC4009IUF#TRPBF pinout, LTC4009IUF#TRPBF application, or LTC4009IUF#TRPBF equivalent, key selection criteria include its I-grade industrial temperature range (–40°C to 125°C), programmable AC adapter current limiting (±3% accuracy), analog charge current monitoring via PROG pin, and thermally enhanced 20-pin 4mm × 4mm QFN package with exposed GND pad.
Technical Context
The LTC4009IUF#TRPBF implements current-mode PWM control with a 550kHz quasi-constant frequency architecture, using an external inductor and dual N-channel MOSFETs (driven by TGATE/BGATE) to regulate charge current and battery voltage. Its error amplifier compares VFB (1.2085V reference) against a resistor-divider feedback signal and integrates adapter current limit (CLP–CLN) and charge current (PROG) inputs to generate ITH-controlled peak current thresholds.
It features three open-drain status outputs-CHRG (triple-state: strong pull-down, 25µA weak pull-down, high-Z), ACP (AC present), and ICL (input current limit active)-all referenced to INTVDD and compatible with 3.3V/5V logic. Shutdown is controlled by SHDN (active-low, 300mV threshold) and DCDIV (1.2V AC-present detection), with micropower operation (<215µA shutdown current) and thermal protection up to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C (I-grade), enabling use in industrial and automotive-adjacent portable systems |
| Switching Frequency | 550kHz typical, allowing compact 6.8µH inductors and ceramic bulk capacitors without audible noise |
| Float Voltage Accuracy | ±0.5% (LTC4009 variant), ensuring precise Li-ion/Li-polymer cell voltage regulation across temperature |
| Charge Current Accuracy | ±4% (C/I-grade), determined by RIN, RPROG, and RSENSE matching, critical for safe fast-charging |
| Input Current Limit Acc. | ±3%, set by external RIN on CLP–CLN, enabling optimal power draw from fixed-input adapters |
| Package | 20-pin 4mm × 4mm × 0.75mm QFN with exposed GND pad (θJA = 37°C/W), supporting >3A continuous charge current with proper PCB copper |
| INTVDD Output | 5.0V ±1.5%, powers internal gate drivers and can supply external circuitry up to 20mA load |
Pinout & Package
Package: 20-lead (4mm × 4mm) plastic QFN with exposed GND pad (Pin 21), requiring soldering to PCB ground plane for thermal and electrical integrity (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative | Sense node for adapter input current limiting; threshold is CLP – 100mV; must be filtered to reject switching noise |
| CLP (2) | Adapter input current limit positive & power rail | Primary power source for IC; sets input current limit threshold and supplies internal circuits up to 28V |
| DCIN (3) | DC input supply | Secondary power path (isolated from CLP via diode); used when CLP is absent or during load dump events |
| ICL (4) | Input current limit indicator | Open-drain output active-low when charge current is reduced due to CLP–CLN limiting; requires external pull-up |
| DCDIV (5) | AC adapter presence comparator input | Resistor-divider input detecting DC adapter presence (1.2V threshold) and overvoltage (1.825V OVP) |
| SHDN (6) | Active-low shutdown control | Drives IC into micropower shutdown (<215µA) when pulled below 300mV; includes 50kΩ internal pull-down |
| ACP (7) | AC adapter present indicator | Open-drain output active-low when DCDIV threshold is met; remains active in all operating states including shutdown |
| CHRG (8) | Charge status indicator | Three-state open-drain: strong pull-down (bulk charge), 25µA weak pull-down (C/10), high-Z (no charge or fault) |
| FBDIV (9) | Battery feedback divider source | Open-drain PFET connecting BAT to external resistor divider; enables precise VFB-based float voltage programming |
| VFB (10) | Battery voltage feedback input | High-impedance input (±20nA bias) referenced to 1.2085V internal bandgap; sets output voltage via external divider |
| BAT (11) | Battery pack connection | Main battery terminal; voltage sensed for CV regulation and used as reference for CSP/CSN differential sensing |
| ITH (12) | PWM control voltage & compensation node | Analog control voltage setting peak inductor current; external RC network provides loop stability and soft-start timing |
| PROG (13) | Charge current programming & monitor | Linearized voltage output proportional to actual charge current; sets max current via RPROG and senses VSENSE via RIN |
| CSN (14) | Current sense negative input | Differential input for RSENSE negative side; operating range extends 50mV below BAT to avoid saturation |
| CSP (15) | Current sense positive input | Differential input for RSENSE positive side; common-mode range extends 200mV above BAT |
| BGATE (16) | Synchronous rectifier gate driver | 5V CMOS output driving bottom N-FET; enables >90% efficiency by replacing Schottky diode |
| INTVDD (17) | Internal 5V regulator output | Stable 5V supply for gate drivers and internal logic; shuts down in SHDN; capable of sourcing 20mA |
| SW (18) | Switch node | High dv/dt node connecting external inductor and FETs; requires tight layout and Kelvin routing for CSP/CSN |
| TGATE (19) | Top N-FET gate driver | Bootstrapped 5V CMOS output driving high-side N-FET; requires BOOST capacitor tied between SW and BOOST |
| BOOST (20) | Bootstrap capacitor supply | Return node for bootstrap capacitor; voltage range (INTVDD –1V) to (CLP +5V) ensures proper TGATE drive during duty cycle |
| GND (21) | Exposed thermal pad / system ground | Must be soldered to large PCB copper area for thermal dissipation and low-noise reference; connects internally to all critical analog blocks |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology | Enables >90% efficiency at 3A with IHLP-2525CZ 6.8µH inductor and SSB44 MOSFETs, reducing heat and board space |
| Programmable float voltage | External resistor divider on VFB allows precise battery voltage setting from 2V to 28V, supporting Li-ion, LiFePO4, NiMH, and lead-acid chemistries |
| Analog charge current monitor | PROG pin provides linear 0–1.2V output proportional to actual charge current, eliminating need for separate current-sense ADC |
| Triple-state CHRG output | Integrates bulk charge detection, C/10 end-of-charge flag, and fault indication in one pin-reducing MCU GPIO count and simplifying firmware |
| Adapter input current limiting | CLP–CLN sensing enables dynamic charge rate adjustment to match available AC adapter power, preventing brownouts during system + battery operation |
| Micropower shutdown | 215µA shutdown current extends battery standby time in portable instruments and backup systems where long shelf life is critical |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: High-power charging of 3-cell or 4-cell Li-ion battery packs in ultrabooks with dual-power operation (system + battery). IC Role / Device Role / Timing Role: Primary battery charge controller managing CC/CV profile, adapter current sharing, and thermal-aware charge rate modulation. Use Value: Enables simultaneous system run and fast charging using standard 19V AC adapters, with 550kHz switching minimizing EMI and allowing small 4mm × 4mm layout footprint. | Use Scenario: Rechargeable handheld test equipment (e.g., multimeters, oscilloscopes) requiring long runtime and reliable charge termination via host MCU. IC Role / Device Role / Timing Role: Flexible charger building block providing accurate current/voltage regulation and analog current monitoring for firmware-controlled charge algorithms. Use Value: ±4% charge current accuracy and ±0.5% voltage accuracy ensure consistent battery health across thousands of charge cycles, extending product service life. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: UPS modules for POS terminals and medical monitors needing seamless transition between line power and battery, with low quiescent current during standby. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with micropower shutdown and reverse-current protection for sealed lead-acid or LiFePO4 backup batteries. Use Value: 215µA shutdown current and BAT leakage <±1.5µA preserve battery capacity during months of standby, ensuring reliable failover when AC fails. | Use Scenario: Ruggedized warehouse scanners and field service tablets operating in wide ambient temperatures (–20°C to 60°C) with hot-swap battery capability. IC Role / Device Role / Timing Role: Industrial-grade charger controller supporting –40°C to 125°C operation, robust against voltage transients and ESD per IEC 61000-4-2 Level 4. Use Value: I-grade temperature rating and 125°C junction limit allow reliable operation in sealed enclosures without forced air cooling, reducing system BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4009CUF#TRPBF | Same functionality and pinout, but C-grade (0°C to 85°C) temperature range and higher VBAT accuracy tolerance (±0.8% vs ±0.5%) | Suitable for commercial-grade notebooks and consumer portables not requiring extended temperature operation | Select when cost sensitivity outweighs industrial temperature needs and system thermal design stays within 0°C–85°C ambient |
| LTC4009IUF-1#TRPBF | Pin-programmable 4.1V/cell output for 1–4 series Li-ion packs; replaces external VFB divider with FVS0/FVS1 digital select inputs | Optimized for fixed-chemistry Li-ion designs where flexibility is traded for simplified layout and reduced component count | Choose when designing dedicated single-chemistry chargers and external MCU coordination of voltage setting is unnecessary |
Compared with LTC4009CUF#TRPBF, the LTC4009IUF#TRPBF offers tighter voltage regulation and guaranteed operation down to –40°C-critical for outdoor or uncontrolled-environment deployments. Versus LTC4009IUF-1#TRPBF, it retains full analog VFB programmability for multi-chemistry support but requires two external resistors instead of digital pin strapping.
Availability
LTC4009IUF#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, extended temperature reliability, and synchronous buck efficiency.
Supply support for LTC4009IUF#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.
The LTC4009 product line was designed as a flexible, high-accuracy battery charger controller family for multi-chemistry applications-emphasizing programmability, efficiency, and integration of adapter current limiting and status signaling without built-in termination logic.
FAQ
What is the operating temperature range for the LTC4009IUF#TRPBF?
The LTC4009IUF#TRPBF is rated for –40°C to 125°C junction temperature operation, with guaranteed performance across the full industrial temperature range. This specification is validated per Linear Technology's I-grade qualification standards and enables deployment in harsh environments such as enclosed industrial terminals or automotive-adjacent portable equipment where ambient temperatures exceed 85°C.
How does the LTC4009IUF#TRPBF implement charge current monitoring?
The LTC4009IUF#TRPBF provides analog charge current monitoring via the PROG pin, which outputs a linear voltage (0–1.2V) proportional to actual charge current. This is derived from the instantaneous VSENSE/RIN signal averaged by external CPROG and scaled by RPROG. The LTC4009IUF#TRPBF datasheet specifies ±4% accuracy, making it suitable for closed-loop MCU-based charge control without additional current-sense amplifiers.
Can the LTC4009IUF#TRPBF be used for lithium iron phosphate (LiFePO4) battery charging?
Yes, the LTC4009IUF#TRPBF supports LiFePO4 charging through its fully programmable float voltage range (2V–28V) and external resistor divider on VFB. For a typical 4-cell LiFePO4 pack (14.6V nominal), setting VFB to 3.65V/cell via the divider achieves precise regulation. The LTC4009IUF#TRPBF's lack of built-in termination allows full firmware control over CC/CV transition, top-off, and safety cutoff-essential for LiFePO4's flat voltage curve.
What is the purpose of the FBDIV pin on the LTC4009IUF#TRPBF?
The FBDIV pin on the LTC4009IUF#TRPBF is an open-drain PFET output that connects the BAT node to the external resistor divider network during charging. This ensures the VFB input sees a stable, low-impedance reference directly from the battery, improving voltage regulation accuracy by eliminating divider loading errors. It is inactive (high-Z) during shutdown or when charging is disabled, isolating the divider from BAT.
Does the LTC4009IUF#TRPBF require external MOSFETs, and what are the gate drive requirements?
Yes, the LTC4009IUF#TRPBF requires two external N-channel MOSFETs: one for the high-side switch (driven by TGATE) and one for synchronous rectification (driven by BGATE). TGATE is bootstrapped and supports gate voltages up to CLP + 5V; BGATE is referenced to GND and outputs 0–5V. Both drivers deliver fast rise/fall times (<110ns) and support logic-level FETs; recommended devices include SSB44 (high-side) and DMN3025L (low-side) per the LTC4009IUF#TRPBF demo board design.
LTC4009IUF#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:
- 16.8V
- 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#TRPBF FAQ
1.How can I place an order for LTC4009IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4009IUF#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#TRPBF reliable?
The price and inventory of LTC4009IUF#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4009IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4009IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4009IUF#TRPBF?
LTC4009IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4009IUF#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#TRPBF?
For technical support, including LTC4009IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4009IUF#TRPBF requirements.
6.How does Aetrix verify that LTC4009IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4009IUF#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4009IUF#TRPBF?
All LTC4009IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4009IUF#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC4009IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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