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Analog Devices Inc. LTC4012CUF-2#TRPBF
- Part No.:
- LTC4012CUF-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012CUF-2#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
LTC4012CUF-2#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller optimized for 4.2V/cell Li-ion/polymer packs (2–4 series cells). It delivers ±0.5% float voltage accuracy, programmable charge current with 4% accuracy, and 550kHz quasi-constant-frequency PWM operation-enabling silent charging with ceramic capacitors in portable instruments and notebook computers.
For engineers reviewing the LTC4012CUF-2#TRPBF datasheet, LTC4012CUF-2#TRPBF pinout, LTC4012CUF-2#TRPBF application, or LTC4012CUF-2#TRPBF equivalent, key selection criteria include its pin-programmable 4.2V/cell output, INFET-based PowerPath™ ideal diode control, AC adapter input current limiting with ICL status indication, and 20-pin 4mm × 4mm QFN package with exposed thermal pad.
Technical Context
The LTC4012CUF-2#TRPBF implements a current-mode synchronous buck topology with external NMOS power switches (TGATE/BGATE), supporting wide input (6–28V) and output (2–28V) ranges. Its dual-loop control uses PROG for real-time charge current monitoring and ITH for peak-current-mode compensation.
Unlike integrated chargers, it lacks built-in termination logic and relies on external microcontroller coordination. The FVS0/FVS1 pins configure fixed 4.2V/cell output for 1–4-cell Li-ion packs, while CLP/CLN sensing enables precise input current limiting at ±3% accuracy via external sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.2V per cell (pin-programmed via FVS0/FVS1); supports 2–4-series Li-ion packs without external resistive divider. |
| Charge Accuracy | ±4% over temperature; set by RIN and RPROG; enables precise high-current bulk charging. |
| Input Current Limit | Programmable with ±3% accuracy via CLP–CLN differential; prevents AC adapter overload during concurrent system + battery load. |
| Switching Frequency | 550kHz typical; avoids audible noise with ceramic bulk capacitors and reduces inductor size. |
| Voltage Regulation | ±0.5% float voltage accuracy (C-grade); ensures cell-level voltage precision critical for Li-ion safety and cycle life. |
| Package | 20-pin 4mm × 4mm × 0.75mm QFN with exposed GND pad; provides low thermal resistance (θJA = 37°C/W) for high-power charging. |
Pinout & Package
20-pin (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND), rated for 0°C to 85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit negative input | Senses voltage drop across RSENSE; threshold is 100mV below CLP for accurate input current regulation. |
| CLP (2) | Current limit positive input & power rail | Primary DC input supply path; powers internal circuits and sets reference for input current limiting. |
| INFET (3) | PowerPath™ ideal diode gate driver | Drives external PMOS to maintain ~25mV forward drop; blocks reverse current when DCIN < CLP. |
| DCIN (4) | DC input sense | Monitors adapter presence relative to CLP; enables charger only when DCIN > CLP + 60mV. |
| ACP (5) | AC present indicator | Open-drain output active-low when DCIN > BAT + 500mV; signals host MCU of valid adapter connection. |
| SHDN (6) | Shutdown control | Active-low enable; pulls below 300mV to force shutdown and reduce battery leakage to <1.5µA. |
| CHRG (7) | Charge status indicator | Three-state open-drain: strong pull-down (charging), 25µA weak pull-down (C/10), high-Z (not charging). |
| ICL (8) | Input current limit indicator | Active-low signal asserts when charge current is reduced due to adapter current limiting. |
| FVS0 (9) | Battery voltage select (LSB) | Configures 4.2V/cell output; tied to GND or INTVDD to select among four preset voltages (LTC4012-2 variant). |
| FVS1 (10) | Battery voltage select (MSB) | MSB of 2-bit voltage select; used with FVS0 to define 1–4-cell Li-ion pack configuration. |
| BAT (11) | Battery pack connection | Direct connection to battery terminals; used for voltage feedback and current sensing reference. |
| ITH (12) | PWM compensation node | Internal error amplifier output; external RC network sets loop stability and soft-start timing. |
| PROG (13) | Charge current programming & monitor | Voltage proportional to actual charge current (11.67µA/mV); enables real-time analog monitoring. |
| CSN (14) | Current sense negative | Connects to low-side of RSENSE; operates within ±200mV of BAT for accurate high-side sensing. |
| CSP (15) | Current sense positive | Connects to high-side of RSENSE; matched with CSN for differential sensing of charge current. |
| BGATE (16) | Synchronous rectifier driver | Drives NMOS bottom switch; improves efficiency by replacing Schottky diode in buck converter. |
| INTVDD (17) | Internal 5V regulator output | Supplies gate drivers; shuts down in SHDN mode; max 20mA load capability. |
| SW (18) | Switch node | High dv/dt node connecting to inductor; requires tight layout to minimize EMI and switching losses. |
| TGATE (19) | Top-side NFET driver | Drives NMOS high-side switch; bootstrap supply referenced to SW via BOOST pin. |
| BOOST (20) | Bootstrap capacitor supply | Connects to bootstrap cap between SW and INTVDD; enables high-side NMOS gate drive above CLP. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable 4.2V/cell output | Eliminates external resistor divider for Li-ion packs; FVS0/FVS1 select 1–4-cell configurations directly. |
| INFET ideal diode control | Maintains 25mV forward drop and blocks reverse current in <6µs; improves system efficiency and prevents battery discharge into adapter. |
| 550kHz quasi-constant-frequency PWM | Enables use of small ceramic capacitors without audible noise; reduces EMI filtering requirements vs variable-frequency controllers. |
| Analog charge current monitor (PROG) | Provides linear voltage output (11.67µA/mV) for real-time current measurement without ADC or external op-amp. |
| AC adapter input current limiting | Prevents adapter overload during simultaneous system + battery charging; ICL pin signals reduction event to host MCU. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-power operation with AC adapter and removable Li-ion battery pack. IC Role / Device Role / Timing Role: Synchronous buck charger controller managing bulk/constant-voltage charge phases under MCU supervision. Use Value: Enables fast charging at up to 3A while maintaining ±0.5% voltage accuracy and preventing adapter overload via CLP/CLN sensing. |
Use Scenario: Handheld test equipment requiring long runtime and hot-swap battery capability. IC Role / Device Role / Timing Role: PowerPath™ controller providing seamless transition between battery and external DC input. Use Value: INFET gate drive ensures <6µs reverse-current blocking, protecting battery during adapter plug/unplug events. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: Uninterruptible power for embedded controllers during AC failure. IC Role / Device Role / Timing Role: High-efficiency charger with programmable C/10 termination detection via CHRG pin. Use Value: CHRG's three-state output directly signals MCU when charge current drops to 10% of programmed value-enabling safe termination without additional circuitry. |
Use Scenario: Ruggedized field terminal with 3-cell Li-ion pack and 24V DC input. IC Role / Device Role / Timing Role: Wide-input (6–28V) buck controller adapting industrial supply to precise 12.6V battery float voltage. Use Value: ±4% charge current accuracy and ±3% input current limit ensure consistent performance across temperature and line variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4012CUF-1#TRPBF | 4.1V/cell fixed output; identical pinout, package, and feature set except FVS0/FVS1 decode to lower voltage. | Designed for 4.1V/cell Li-ion chemistries; not suitable for standard 4.2V/cell packs without derating. | Select LTC4012CUF-1#TRPBF only when battery specification mandates 4.1V/cell nominal voltage. |
| BQ24725ARHDT | TI part with integrated MOSFET drivers but no INFET ideal diode control; requires external PFET for PowerPath™ function. | Lacks native reverse-current protection and adaptive forward-drop regulation; needs additional circuitry for notebook-style adapter handoff. | Choose BQ24725ARHDT if system already includes discrete PFET control and prioritizes TI ecosystem support over integrated PowerPath™. |
Compared with LTC4012CUF-1#TRPBF and BQ24725ARHDT, the LTC4012CUF-2#TRPBF uniquely combines pin-selectable 4.2V/cell output, integrated INFET ideal diode control, and analog PROG-based current monitoring-reducing BOM count and PCB area in space-constrained portable designs.
Availability
LTC4012CUF-2#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, extended lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC4012CUF-2#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 ICs, serving industrial, automotive, communications, and computing markets.
The LTC4012 family was designed as a flexible, high-accuracy battery charger controller platform for multi-cell Li-ion applications-emphasizing programmability, efficiency, and integration of PowerPath™ functionality without sacrificing external MCU control.
FAQ
What battery chemistries does the LTC4012CUF-2#TRPBF support?
The LTC4012CUF-2#TRPBF supports any rechargeable battery chemistry-including Li-ion, Li-polymer, NiMH, and lead-acid-because it lacks built-in termination logic and relies on external MCU control. Its 4.2V/cell output is specifically calibrated for standard Li-ion/polymer packs with 2–4 series cells, but the full 2V–28V output range and programmable current allow adaptation to other chemistries via firmware.
How does the LTC4012CUF-2#TRPBF implement PowerPath™ control?
The LTC4012CUF-2#TRPBF implements PowerPath™ control through its INFET pin, which drives an external PMOS transistor between DCIN and CLP. It regulates forward voltage to ~25mV during normal operation and disables the FET in <6µs if reverse current is detected (DCIN–CLP < –25mV), preventing battery discharge into the adapter. This eliminates need for discrete ideal diode controllers.
Can the LTC4012CUF-2#TRPBF be used without a microcontroller?
No-the LTC4012CUF-2#TRPBF is a controller, not a standalone charger. It requires external MCU coordination for charge algorithm execution (e.g., preconditioning, constant-current/constant-voltage sequencing, C/10 termination, and safety timeouts). Its CHRG, ICL, and ACP pins provide status signals, and PROG offers analog current monitoring, but all decision logic resides externally.
What is the purpose of the FVS0 and FVS1 pins on the LTC4012CUF-2#TRPBF?
FVS0 and FVS1 are digital inputs that configure the LTC4012CUF-2#TRPBF for 4.2V/cell Li-ion output across 1–4 series cells. Tied to GND or INTVDD, they form a 2-bit code selecting one of four preset voltages (e.g., FVS1=0/FVS0=0 → 4.2V; FVS1=1/FVS0=0 → 12.6V). This replaces external resistor dividers and simplifies design for common pack configurations.
Does the LTC4012CUF-2#TRPBF include thermal protection?
The LTC4012CUF-2#TRPBF does not include internal thermal shutdown. Instead, it relies on package-level thermal design: the exposed GND pad (Pin 21) must be soldered to a large PCB copper area to achieve θJA = 37°C/W. Junction temperature must be kept ≤125°C using layout and airflow; external thermal monitoring via MCU is recommended for high-power applications.
LTC4012CUF-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- 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
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 16.8V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4012CUF-2#TRPBF FAQ
1.How can I place an order for LTC4012CUF-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012CUF-2#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 LTC4012CUF-2#TRPBF reliable?
The price and inventory of LTC4012CUF-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4012CUF-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4012CUF-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012CUF-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012CUF-2#TRPBF?
LTC4012CUF-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012CUF-2#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 LTC4012CUF-2#TRPBF?
For technical support, including LTC4012CUF-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012CUF-2#TRPBF requirements.
6.How does Aetrix verify that LTC4012CUF-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4012CUF-2#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 LTC4012CUF-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4012CUF-2#TRPBF?
All LTC4012CUF-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012CUF-2#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 LTC4012CUF-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4012CUF-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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