My Inquiry
My Account
Analog Devices Inc. LTC4012IUF#TRPBF
- Part No.:
- LTC4012IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4012IUF#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1-4CL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC4012IUF#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck battery charger controller supporting Li-ion, Li-polymer, and other chemistries. It delivers ±0.5% float voltage accuracy, programmable charge current with 4% accuracy, and 550kHz quasi-constant-frequency PWM operation-enabling high-efficiency, low-noise charging in notebook computers and portable instruments.
For engineers reviewing the LTC4012IUF#TRPBF datasheet, LTC4012IUF#TRPBF pinout, LTC4012IUF#TRPBF application, or LTC4012IUF#TRPBF equivalent, key selection criteria include its wide 2V–28V output voltage range, integrated PowerPath™ ideal diode control, analog charge current monitoring via PROG pin, and –40°C to 125°C industrial temperature grade.
Technical Context
The LTC4012IUF#TRPBF implements current-mode PWM control with synchronous rectification (BGATE/TGATE outputs), enabling >95% efficiency at 2A charge current. Its ITH node provides cycle-by-cycle peak current sensing and loop compensation interface, while FBDIV (LTC4012 variant) or FVS0/FVS1 (LTC4012-1/-2) configure output voltage either via resistor divider or digital pin-select.
PowerPath™ control operates through INFET output driving an external PMOS, regulating forward drop to ~25mV and blocking reverse current within <6µs. Input current limiting uses CLP/CLN differential sensing with 3% accuracy, and status outputs (CHRG, ICL, ACP) provide real-time state feedback for MCU coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2V to 28V - supports 1–4-cell Li-ion packs and non-standard chemistries via external feedback divider on VFB/FBDIV. |
| Charge Current Accuracy | ±4% - ensures precise current regulation across temperature, critical for safe multi-stage battery charging algorithms. |
| Float Voltage Accuracy | ±0.5% - guarantees tight battery terminal voltage control during constant-voltage phase, minimizing overcharge risk. |
| Switching Frequency | 550kHz typical - enables compact magnetics and ceramic bulk capacitors without audible noise. |
| Operating Temp Range | –40°C to 125°C - qualified for industrial and extended-temperature embedded systems requiring long-term reliability. |
| Input Current Limit Accuracy | ±3% - allows predictable adapter power budgeting without derating, essential for dual-load (system + battery) operation. |
| Package | 20-pin 4mm × 4mm QFN with exposed thermal pad - provides low θJA (37°C/W) and robust thermal performance under continuous 3A charge loads. |
Pinout & Package
20-pin 4mm × 4mm × 0.75mm plastic QFN package with exposed GND paddle (Pin 21), requiring soldering to PCB thermal pad for electrical integrity and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLN (1) | Current limit sense negative input | Differential input with CLP; sets 100mV threshold for adapter current limiting - must be filtered to reject switching noise. |
| CLP (2) | Adapter input supply & current limit positive input | Primary power source (6V–28V); supplies internal circuits and defines reference for CLN sensing and INFET control. |
| INFET (3) | PMOS gate driver output | Drives external PFET to maintain ~25mV forward drop and block reverse current - clamped ~6V below CLP. |
| DCIN (4) | DC input voltage sense | Sense input for PowerPath control; compared to CLP to detect AC adapter presence and enable charging. |
| ACP (5) | Active-low AC present indicator | Open-drain output pulled low when DCIN exceeds BAT by ≥500mV - signals host MCU that adapter is valid. |
| SHDN (6) | Active-low shutdown control | Drives <300mV to force full shutdown; internal 40kΩ pulldown ensures safe default state during power-up. |
| CHRG (7) | Active-low charge status indicator | Three-state open-drain: strong pull-down (charging), 25µA weak pull-down (C/10), high-Z (shutdown or no charge). |
| ICL (8) | Active-low input current limit indicator | Pulled low when charge current is reduced due to CLP/CLN current limiting - enables dynamic power allocation. |
| VFB (9) | Battery voltage feedback input | High-impedance input referenced to 1.2085V internal bandgap - used with external divider to set float voltage. |
| FBDIV (10) | Feedback divider source | Open-drain PFET output connected to BAT during charging - completes feedback path for VFB-based regulation. |
| BAT (11) | Battery pack connection | Main battery terminal; voltage sensed for PWM control and C/10 detection - operating range up to CLN voltage. |
| ITH (12) | PWM current sense & compensation node | Analog voltage proportional to peak inductor current; external R-C network sets loop stability and soft-start timing. |
| PROG (13) | Charge current programming & monitor | Voltage linearly tracks actual charge current (11.67µA/mV); used for programming via RPROG and real-time monitoring. |
| CSN (14) | Current sense negative input | Connects to low-side of RSENSE; common-mode range extends 50mV below BAT - enables accurate low-side sensing. |
| CSP (15) | Current sense positive input | Connects to high-side of RSENSE; complements CSN for differential current measurement across RSENSE. |
| BGATE (16) | Synchronous rectifier NFET driver | Drives low-side NMOS switch in buck converter - improves efficiency vs. diode rectification, especially at high currents. |
| INTVDD (17) | Internal 5V regulator output | Provides regulated 5V (±1%) for gate drivers; shuts down in SHDN mode - can power external circuitry if load ≤20mA. |
| SW (18) | Switch node | Connection to buck converter inductor; high dv/dt node requiring careful layout - referenced for TGATE driver. |
| TGATE (19) | Top-side NFET gate driver | Drives high-side NMOS switch; bootstrap supply via BOOST pin - requires external capacitor between BOOST and SW. |
| BOOST (20) | Bootstrap capacitor supply | Input for bootstrap capacitor; charges from INTVDD/SW during low-side conduction - enables high-side NMOS drive. |
| GND (21) | Ground / Exposed thermal pad | Common reference for all circuits; exposed paddle must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Ideal Diode Control | INFET output regulates forward voltage to ~25mV and blocks reverse current in <6µs - eliminates need for discrete OR-ing FETs and improves system efficiency. |
| Programmable Input Current Limit | CLP/CLN differential sensing with ±3% accuracy - enables simultaneous system operation and battery charging without adapter overload. |
| Analog Charge Current Monitoring | PROG pin provides linear voltage output (11.67µA/mV) tracking actual charge current - simplifies closed-loop MCU control and telemetry. |
| No Audible Noise Operation | 550kHz quasi-constant-frequency PWM architecture - avoids sub-audible frequencies, permitting use of low-ESR ceramic capacitors without squeal. |
| Micropower Shutdown | <10µA battery leakage in shutdown (measured at BAT pins) - extends standby time in battery-backed applications. |
| Wide Input/Output Voltage Ranges | 6V–28V CLP input and 2V–28V programmable output - supports diverse battery configurations and system rail voltages. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-power system where AC adapter powers both motherboard and Li-ion battery pack simultaneously. IC Role / Device Role / Timing Role: Synchronous buck charger controller managing adaptive charge current based on adapter capability and battery state. Use Value: PowerPath™ prevents backfeed, while programmable input current limit ensures stable 12V system rail during 3A battery charging. |
Use Scenario: Handheld multimeter with rechargeable 3S Li-ion pack and USB-powered firmware updates. IC Role / Device Role / Timing Role: Battery management controller coordinating charge termination via external MCU using PROG voltage and CHRG status. Use Value: ±0.5% float voltage accuracy maintains cell balance; C/10 detection enables precise end-of-charge signaling. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: UPS module for PLC I/O modules requiring seamless switchover between 24V DC bus and 4S LiFePO₄ backup battery. IC Role / Device Role / Timing Role: High-reliability charger controller with –40°C to 125°C operation and robust PowerPath™ reverse-current protection. Use Value: INFET response time <6µs prevents battery discharge into failed DC bus; wide 6V–28V CLP range accommodates bus fluctuations. |
Use Scenario: Ruggedized warehouse scanner with hot-swappable battery and 5V system rail powered from same pack. IC Role / Device Role / Timing Role: Multi-chemistry charger supporting Li-ion and NiMH via external MCU-controlled voltage/current profiles. Use Value: No built-in termination allows full algorithm flexibility; analog PROG monitoring enables real-time charge health diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4015IUFD#TRPBF | Integrated MOSFET drivers + integrated 3.3V LDO; higher integration, larger 28-pin QFN package. | Reduces external component count but requires different PCB layout and thermal design. | Select when board space is constrained and integrated power FET drivers are preferred over discrete solutions. |
| BQ24725ARHRT | TI part with SMBus interface, fixed 4.2V/cell output, no analog PROG monitoring output. | Requires host processor with SMBus support; lacks linear current monitoring capability of LTC4012IUF#TRPBF. | Select for standardized communication protocols and simplified firmware integration where analog telemetry is not required. |
Compared with LTC4015IUFD#TRPBF and BQ24725ARHRT, the LTC4012IUF#TRPBF offers superior analog current monitoring, wider output voltage programmability, and finer-grained input current limiting - making it optimal for custom battery algorithms and noise-sensitive industrial designs.
Availability
LTC4012IUF#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, extended temperature operation, and flexible multi-chemistry charging control.
Supply support for LTC4012IUF#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 healthcare markets.
The LTC4012IUF#TRPBF belongs to Linear's PowerPath™ battery charger controller family, designed for high-efficiency, low-noise, multi-chemistry charging in space-constrained portable and industrial systems requiring precise analog control and robust thermal performance.
FAQ
What battery chemistries does the LTC4012IUF#TRPBF support?
The LTC4012IUF#TRPBF supports Li-ion, Li-polymer, NiMH, and other rechargeable chemistries through fully programmable voltage and current settings. Unlike fixed-chemistry chargers, it has no built-in termination logic - all charge algorithms must be managed externally (e.g., by an MCU), giving full control over CV/CC profiles, temperature cutoffs, and safety timers. This makes LTC4012IUF#TRPBF suitable for custom battery packs where chemistry-specific behavior is required.
How does the LTC4012IUF#TRPBF implement PowerPath™ control?
The LTC4012IUF#TRPBF implements PowerPath™ control via its INFET pin, which drives the gate of an external PMOS transistor between DCIN and CLP. When DCIN exceeds CLP by ≥60mV, INFET regulates the PFET to maintain ~25mV forward drop. If DCIN falls below CLP by >25mV, INFET turns off the PFET in <6µs to block reverse current. This eliminates need for discrete ideal diodes and ensures seamless switchover between adapter and battery power.
Can the LTC4012IUF#TRPBF be used without an external microcontroller?
The LTC4012IUF#TRPBF cannot operate autonomously as a complete charger - it lacks built-in charge termination, temperature monitoring, or state machine logic. It requires an external controller (e.g., MCU) to interpret CHRG, ICL, and ACP signals, adjust PROG-based current limits, and manage full charge algorithms. However, basic constant-current/constant-voltage charging can be implemented with passive components for simple applications where full termination isn't needed.
What is the function of the PROG pin on the LTC4012IUF#TRPBF?
The PROG pin on the LTC4012IUF#TRPBF serves two critical functions: (1) it programs maximum charge current via an external resistor (RPROG) between PROG and GND, and (2) it provides an analog voltage output linearly proportional to actual charge current (11.67µA per mV). This dual role enables both precise current setting and real-time telemetry - allowing an external MCU to monitor charge progress, detect faults, and dynamically adjust parameters without additional ADC channels.
Does the LTC4012IUF#TRPBF support input current limiting, and how is it configured?
Yes, the LTC4012IUF#TRPBF supports precise input current limiting via the CLP and CLN pins. A sense resistor between CLP and the adapter return path sets the limit threshold - the device reduces charge current when the CLP–CLN differential reaches 100mV. Accuracy is ±3% over temperature. The ICL pin asserts low to signal active limiting, enabling host systems to throttle system load or adjust charging rate. This feature ensures adapter power is shared intelligently between system and battery loads.
LTC4012IUF#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:
- -
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4012IUF#TRPBF FAQ
1.How can I place an order for LTC4012IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4012IUF#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 LTC4012IUF#TRPBF reliable?
The price and inventory of LTC4012IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4012IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4012IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4012IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4012IUF#TRPBF?
LTC4012IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4012IUF#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 LTC4012IUF#TRPBF?
For technical support, including LTC4012IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4012IUF#TRPBF requirements.
6.How does Aetrix verify that LTC4012IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4012IUF#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 LTC4012IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4012IUF#TRPBF?
All LTC4012IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4012IUF#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 LTC4012IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC4012IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4012IUF#TRPBF Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
