My Inquiry
My Account
Analog Devices Inc. LTC4066EUF#PBF
- Part No.:
- LTC4066EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC4066EUF#PBF.pdf
- Description:
- IC BATT MFUNC LI-ION 1CELL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:111
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC4066EUF#PBF from Analog Devices (formerly Linear Technology) is a USB power controller and single-cell Li-ion linear battery charger with integrated low-loss ideal diode. It delivers 500mA/100mA programmable input current limiting, 4.2V ±0.8% float voltage regulation, and 50mΩ ideal diode path from BAT to OUT - enabling seamless power source handoff in portable USB devices such as GPS units and broadband modems.
For engineers reviewing the LTC4066EUF#PBF datasheet, LTC4066EUF#PBF pinout, LTC4066EUF#PBF application, or LTC4066EUF#PBF equivalent, key selection considerations include its dual-mode current limit (HPWR-selectable), analog gas gauge via ISTAT, NTC thermistor temperature qualification, and thermal feedback–enabled constant-current/constant-voltage charging without external compensation.
Technical Context
The LTC4066EUF#PBF integrates three core subsystems: a programmable USB input current limiter (via CLPROG and HPWR), a standalone CC/CV linear charger with 0.8% VFLOAT accuracy and timer-based termination, and a bidirectional ideal diode controller that enables automatic BAT-to-OUT power delivery when IN is absent or overloaded. Its PowerPath™ architecture dynamically balances load current and charge current to enforce USB compliance.
It features dedicated pins for wall adapter detection (WALL/ACPR), suspend mode control (SUSP), shutdown (SHDN), and battery current monitoring (ISTAT/POL). The device operates across –40°C to +85°C, uses internal thermal regulation to cap junction temperature at 105°C, and supports trickle charge below 2.8V with recharging triggered at VFLOAT – 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Current Limit | Programmable up to 500mA (100% mode) or 100mA (20% mode) via CLPROG resistor and HPWR logic pin - ensures strict USB 2.0 compliance. |
| Charge Voltage Accuracy | 4.200V ±0.8% (0°C to 85°C) - guarantees safe, precise full-charge termination for standard Li-ion cells without external calibration. |
| Ideal Diode RON | 45mΩ typical (IBAT = 3A) - minimizes voltage drop and power loss during battery-to-load power transfer. |
| Gas Gauge Output | ISTAT provides 1/1000-scale analog replica of BAT current (±12.5% gain error); POL indicates direction - enables real-time fuel gauging without dedicated IC. |
| NTC Interface | VNTC bias (4.4–4.85V) and cold/hot fault thresholds (0.74×/0.29×VNTC) - supports thermistor-based charge qualification per JEITA standards. |
| Operating Temp Range | –40°C to +85°C - validated for industrial-grade portable equipment including ruggedized GPS and wireless modems. |
| Package | 24-pin 4mm × 4mm QFN, 0.75mm profile, exposed pad grounded - optimized for compact, thermally demanding layouts. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN, 0.75mm nominal height, exposed thermal pad (Pin 25) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pins 1, 3, 8) | Power output/load supply | Delivers regulated power from IN or BAT; must be shorted with ≤10mΩ trace to ensure <50mV inter-pin delta. |
| BAT (Pins 2, 4, 5) | Battery connection | Charging input / discharge output; internal CC/CV regulator and ideal diode anode; must be shorted with ≤10mΩ trace. |
| IN (Pin 9) | USB VBUS input | Primary input source; current-limited by CLPROG/HPWR; UVLO threshold 3.6V (rising). |
| CLDIS (Pin 10) | Current limit disable | Logic high (>1.2V) disables programmed limit, enabling up to 2.6A input - used for wall adapter bypass. |
| SUSP (Pin 11) | USB suspend control | Enables USB-compliant suspend mode (<100μA IN current); preserves battery charging and ideal diode function. |
| SHDN (Pin 12) | Global shutdown | Logic high (>1.2V) disables all power paths and reduces quiescent current to 50μA. |
| HPWR (Pin 13) | High-power select | Selects 100% (500mA) or 20% (100mA) of CLPROG-set current limit - critical for USB enumeration vs. charging trade-off. |
| NTC (Pin 14) | Thermistor sense input | Monitors battery temperature via external NTC/resistor divider; triggers charge suspension outside 0°C–50°C range. |
| VNTC (Pin 15) | NTC bias reference | Provides stable 4.4–4.85V bias for NTC circuit; internal 2.5mA current source. |
| GND (Pin 16) + Exposed Pad (Pin 25) | System ground / thermal path | Exposed pad is GND and must be soldered to PCB copper for θJA = 37°C/W thermal performance. |
| ACPR (Pin 17) | Wall adapter present indicator | Open-drain active-low output - signals wall adapter presence detected on WALL pin. |
| CHRG (Pin 18) | Charge status indicator | Open-drain output pulled low during charging; high-impedance at end-of-charge (EOC) or fault. |
| POL (Pin 19) | Current direction flag | Open-drain output pulled low when BAT supplies current (discharging); high-Z when charging - pairs with ISTAT for gas gauge. |
| WALL (Pin 20) | Wall adapter detect input | Threshold 1.225V rising; disconnects IN→OUT path and asserts ACPR when wall adapter is applied to OUT. |
| TIMER (Pin 21) | Charge timer capacitor | Connects to GND via CTIMER; sets total charge time (tHOURS = 0.1 × CTIMER × RPROG/100); shorting to GND disables charging. |
| CLPROG (Pin 22) | Input current limit programming | Resistor to GND sets IIN(LIM) = 1000 × VCLPROG/RCLPROG; also provides real-time IIN monitor voltage. |
| PROG (Pin 23) | Charge current programming | Resistor to GND sets ICHG = 50,000 × VPROG/RPROG; VPROG held at 1.000V ±20mV. |
| ISTAT (Pin 24) | Analog battery current monitor | Outputs 1/1000 × |IBAT|; polarity indicated by POL; also sets EOC threshold (0.1V ≈ 100mA end-of-charge). |
Key Features
| Feature | Design Value |
|---|---|
| Load-dependent charging | Automatically reduces charge current to keep total input current within USB limits - eliminates risk of host port overcurrent shutdown. |
| Low-loss ideal diode | 45mΩ RON and 30mV forward drop at 200mA - extends runtime by minimizing battery-to-load voltage loss during USB disconnection. |
| Integrated gas gauge | ISTAT + POL provide scalable, resistor-programmable analog current sensing - removes need for separate fuel gauge IC in cost-sensitive designs. |
| Temperature-qualified charging | NTC interface with cold/hot fault thresholds and 3°C hysteresis - meets JEITA safety requirements for Li-ion thermal management. |
| Adaptive charge timer | Timer duration scales with actual charge current (e.g., reduced ICHG extends tTIMER) - prevents premature timeout during thermal or load derating. |
| Seamless multi-source power path | Automatic transition between USB, wall adapter, and battery - no firmware or external logic required for source arbitration. |
Applications
| GPS Tracking Units | USB-Powered Wireless Modems |
|---|---|
|
Use Scenario: Portable asset tracker powered by USB during configuration and by Li-ion battery during field deployment. IC Role / Device Role: Manages USB 500mA input current while charging battery; switches to ideal diode mode when USB removed. Use Value: Ensures uninterrupted operation during USB cable disconnect; maintains accurate state-of-charge via ISTAT/POL analog monitoring. |
Use Scenario: LTE/5G modem drawing bursty load current from USB bus while maintaining battery backup. IC Role / Device Role: Enforces 100mA/500mA USB current limit via HPWR/CLPROG; supplies peak load current from battery via ideal diode. Use Value: Prevents USB host overcurrent faults during RF transmission bursts; extends operational time using full battery capacity. |
| Portable Medical Sensors | Ruggedized Handheld Scanners |
|
Use Scenario: Battery-powered pulse oximeter charged via USB while operating; requires safe, temperature-aware charging. IC Role / Device Role: Uses NTC input to suspend charging outside 0°C–50°C; applies 4.2V ±0.8% float voltage for cell longevity. Use Value: Complies with medical device thermal safety standards; avoids overvoltage stress on aging Li-ion cells. |
Use Scenario: Industrial barcode scanner used in warehouses with intermittent USB charging and frequent battery discharge cycles. IC Role / Device Role: Provides low-dropout ideal diode path (45mΩ) from BAT to OUT; monitors battery health via ISTAT analog output. Use Value: Minimizes voltage sag during motor-driven scan events; enables predictive battery replacement using analog fuel gauge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power management and Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Fixed 100mA/500mA USB current limits; no ideal diode; no NTC interface; 4.2V ±1.0% VFLOAT. | Lacks seamless BAT→OUT power path and temperature-qualified charging - suitable only for basic USB-charged devices without battery backup needs. | Select MAX1555 only if ideal diode functionality and NTC monitoring are unnecessary and board space allows larger TQFN package. |
| BQ24075 | Integrated LDO output; no ideal diode; fixed 100mA/500mA limits; 4.2V ±0.5% VFLOAT; I2C programmable. | Requires external FET for battery backup path; lacks analog gas gauge - adds BOM cost and layout complexity for same functionality. | Choose BQ24075 only if system requires integrated LDO rail and I2C configurability outweighs added component count and missing ideal diode. |
Compared with MAX1555 and BQ24075, the LTC4066EUF#PBF uniquely combines USB-compliant current limiting, precision 4.2V charging, low-RON ideal diode, and analog gas gauge in a single 4mm × 4mm QFN - reducing bill-of-materials count and eliminating firmware dependency for source arbitration.
Availability
LTC4066EUF#PBF is available at Aetrix Electronics and suitable for GPS tracking units, USB-powered wireless modems, and portable medical sensors requiring stable component supply with guaranteed long-term availability and full industrial temperature support.
Supply support for LTC4066EUF#PBF 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 and maintains full product support, documentation, and manufacturing continuity for all Linear power management ICs.
The LTC4066EUF#PBF belongs to Linear's PowerPath™ family, engineered specifically for USB-hosted portable electronics needing autonomous power source arbitration, safe Li-ion charging, and minimal external components.
FAQ
What is the primary function of the LTC4066EUF#PBF in a USB-powered system?
The LTC4066EUF#PBF serves as a complete USB power manager and Li-ion charger, integrating input current limiting, CC/CV battery charging, and an ideal diode for automatic power source handoff. In systems using the LTC4066EUF#PBF, USB current is strictly limited to 100mA or 500mA, battery charging occurs at 4.2V ±0.8%, and seamless transition to battery power happens when USB is disconnected - all without microcontroller intervention.
How does the LTC4066EUF#PBF implement temperature-qualified charging?
The LTC4066EUF#PBF implements temperature-qualified charging via its dedicated NTC and VNTC pins. An external NTC thermistor forms a voltage divider with VNTC (4.4–4.85V bias), and internal comparators trigger charge suspension when the NTC voltage falls outside 0.29×VNTC (hot) or rises above 0.74×VNTC (cold). This ensures the LTC4066EUF#PBF complies with JEITA standards by halting charge outside 0°C–50°C, resuming automatically when temperature returns to range.
Can the LTC4066EUF#PBF support wall adapter input, and how is it configured?
Yes, the LTC4066EUF#PBF supports wall adapter input through its WALL and ACPR pins. A wall adapter is connected to the OUT node (not IN), and the WALL pin detects its presence via a 1.225V rising threshold. When asserted, the LTC4066EUF#PBF disconnects the IN-to-OUT path to prevent backfeed into USB and pulls ACPR low to signal adapter presence. This configuration enables simultaneous battery charging and load powering from the wall adapter - a capability confirmed in the LTC4066EUF#PBF's block diagram and operating modes table.
What is the role of the ISTAT and POL pins on the LTC4066EUF#PBF?
The ISTAT pin on the LTC4066EUF#PBF outputs a current equal to 1/1000 of the absolute value of BAT current (±12.5% gain error), while the POL pin is an open-drain flag indicating direction: pulled low during battery discharge (ISTAT sourcing current), high-impedance during charge (ISTAT sinking current). Together, they form an analog gas gauge - enabling real-time state-of-charge estimation without additional ICs. This dual-signal behavior is explicitly defined in the LTC4066EUF#PBF's pin functions and electrical characteristics tables.
Does the LTC4066EUF#PBF require external components for basic operation, and which are mandatory?
Yes, the LTC4066EUF#PBF requires three mandatory external components for basic operation: a PROG resistor to ground (sets charge current), a CLPROG resistor to ground (sets input current limit), and a TIMER capacitor to ground (sets charge timeout). Additionally, OUT and BAT nodes each require ≥4.7μF ceramic bypass capacitors. These requirements are specified in the LTC4066EUF#PBF's typical application schematic and pin function descriptions - omitting any of these prevents functional charging or current limiting.
LTC4066EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- Over Current
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC4066EUF#PBF FAQ
1.How can I place an order for LTC4066EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4066EUF#PBF 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 LTC4066EUF#PBF reliable?
The price and inventory of LTC4066EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4066EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC4066EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4066EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4066EUF#PBF?
LTC4066EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4066EUF#PBF 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 LTC4066EUF#PBF?
For technical support, including LTC4066EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4066EUF#PBF requirements.
6.How does Aetrix verify that LTC4066EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4066EUF#PBF 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 LTC4066EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC4066EUF#PBF?
All LTC4066EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4066EUF#PBF, 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 LTC4066EUF#PBF part is unused and in its original packaging.
Return procedure for LTC4066EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4066EUF#PBF Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
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…
