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Analog Devices Inc. LTC3335EUDC#TRPBF
- Part No.:
- LTC3335EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3335EUDC#TRPBF.pdf
- Description:
- IC REG BUCK BST PROG 50MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
LTC3335EUDC#TRPBF from Analog Devices (formerly Linear Technology) is a nanopower buck-boost DC/DC converter with integrated precision coulomb counter, designed for ultra-low-power primary-cell battery applications. It delivers up to 50mA output current across eight pin-selectable voltages (1.8V–5.0V), operates down to 1.8V input, and achieves 680nA quiescent current in regulation-enabling multi-year operation in wireless sensors and remote monitors.
For engineers reviewing the LTC3335EUDC#TRPBF datasheet, LTC3335EUDC#TRPBF pinout, LTC3335EUDC#TRPBF application, or LTC3335EUDC#TRPBF equivalent, key selection criteria include IPEAK programmability (5–250mA), ±5% coulomb counting accuracy, I²C-accessible accumulated discharge register, and 3mm × 4mm QFN-20 package with exposed PGND pad for thermal management.
Technical Context
The LTC3335EUDC#TRPBF implements a hysteretic buck-boost topology using four internal MOSFETs (A–D) in an H-bridge configuration, enabling regulation across input voltages below, above, or equal to the output. Its sleep/wake cycle-triggered by VOUT crossing programmable sleep/wake thresholds-minimizes switching loss at light loads while preserving coulomb counter integrity via zero-inductor-current synchronization.
Coulomb counting relies on precise AC(ON) time measurement per switching cycle, compensated for process/temperature variation to achieve ±5% total unadjusted error. The 50-bit counter stores accumulated discharge in Register C (8 MSBs readable via I²C), with qLSB scaling programmably across 32,768:1 full-scale range via prescaler M and IPEAK setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell LiSOCl₂, alkaline, or LiMnO₂ batteries without external regulators. |
| Quiescent Current (Regulated) | 680nA - enables >10-year runtime on 2.4Ah primary cells powering µA-level sensor nodes. |
| Selectable Output Voltages | 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.6V, 4.5V, 5.0V - set via OUT[2:0] pins; eliminates external feedback resistors. |
| Peak Input Current Range | 5mA to 250mA - configured via IPK[2:0]; matches inductor selection to battery chemistry and capacity. |
| Coulomb Counter Accuracy | ±5% total unadjusted error - validated across temperature, BAT voltage, and load; enables reliable battery end-of-life prediction. |
| I²C Interface | Standard-mode (400kHz) - provides read access to accumulated charge register (Register C) and discharge alarm threshold programming. |
| Package | 20-lead 3mm × 4mm QFN with exposed PGND pad - ensures low thermal resistance (θJA = 52°C/W) for high-efficiency operation. |
Pinout & Package
20-lead (3mm × 4mm) plastic QFN package with exposed PGND pad (Pin 21), requiring soldering to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1) | I²C data line | Bi-directional serial data; referenced to DVCC; requires pull-up to DVCC. |
| DVCC (2) | I²C supply reference | Sets logic levels for SDA/SCL; may be tied to BAT, VOUT, or external rail (1.8–5.5V). |
| OUT[2:0] (3–5) | VOUT select inputs | 3-bit code sets regulated output voltage (1.8V–5.0V); must be hard-wired high/low. |
| GNDD (6) | Digital ground | Reference for digital circuits; connect to GNDA and PGND. |
| BAT (7) | Input voltage sense | Connects to PBAT; used for input monitoring and coulomb calculation. |
| PBAT (8) | Input power supply | Main battery connection; supplies buck-boost regulator and internal circuitry. |
| SW1 (9), SW2 (10) | Switch node terminals | Connect external inductor; SW1 links to PMOS A/NMOS B; SW2 links to NMOS C/PMOS D. |
| PVOUT (11) | Output power rail | Delivers regulated output current; connect to VOUT and bulk capacitor. |
| VOUT (12) | Output voltage sense | Feedback node; connects directly to PVOUT for accurate regulation. |
| IPK[2:0] (13–15) | IPEAK select inputs | 3-bit code sets peak inductor current (5–250mA); determines inductor value and battery stress. |
| EN (16) | Enable control | Active-high; disables regulator but retains register state when pulled low. |
| GNDA (17) | Analog ground | Reference for analog blocks (bandgap, comparators); tie to GNDD and PGND. |
| PGOOD (18) | Power-good indicator | Open-drain output; asserts low until VOUT reaches sleep threshold after enable. |
| IRQ (19) | Interrupt request | Active-low; signals discharge alarm threshold breach or coulomb counter overflow. |
| SCL (20) | I²C clock input | Serial clock; referenced to DVCC; requires pull-up to DVCC. |
| PGND (21) | Power ground | Exposed pad; connects to sources of all NMOS switches; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated coulomb counter | 50-bit accumulator with ±5% accuracy; stores discharge in I²C-accessible Register C for battery life analytics. |
| Programmable discharge alarm | Threshold set via I²C; triggers IRQ pin interrupt to wake host MCU for battery replacement alert. |
| Hysteretic sleep/wake control | Eliminates continuous switching at light loads; enters 680nA sleep state only after inductor current reaches 0mA. |
| Full-scale coulomb range scaling | 32,768:1 via prescaler M and IPEAK selection; supports battery capacities from 1.094mAh to 1793Ah. |
| Four-switch buck-boost architecture | Enables step-up, step-down, and inverting operation from single input; no external diodes required. |
Applications
| Wireless Sensor Nodes | Remote Industrial Monitors |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Primary power regulator and battery fuel gauge; maintains stable 3.3V rail while logging cumulative discharge. Use Value: Enables >15-year operation on a single AA lithium cell with predictive battery replacement scheduling. | Use Scenario: Solar-charged remote pressure monitor in oil pipeline infrastructure. IC Role / Device Role / Timing Role: Buck-boost regulator managing variable solar input (2.5–5.5V) to deliver regulated 5.0V for RF transceiver. Use Value: Eliminates need for separate battery gauge IC; reduces BOM count and PCB area by integrating coulomb counting. |
| Dust Networks® SmartMesh® Endpoints | Low-Power IoT Asset Trackers |
Use Scenario: Self-organizing mesh node powered by primary lithium thionyl chloride battery. IC Role / Device Role / Timing Role: Regulates 3.6V output for microcontroller and radio; tracks battery depletion via I²C coulomb register. Use Value: Provides deterministic battery lifetime estimation within SmartMesh network management software. | Use Scenario: GPS-enabled cargo tracker operating in cold-chain logistics with -40°C ambient exposure. IC Role / Device Role / Timing Role: Delivers 2.5V to GPS module and 3.3V to BLE controller; maintains 680nA sleep current across temperature range. Use Value: Guarantees >7-year operation at -40°C to +85°C with ±5% coulomb accuracy despite wide VBAT drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower buck-boost with battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17055G+T | Standalone fuel gauge IC (no integrated regulator); requires external DC/DC; 1% battery SOC accuracy vs. LTC3335's ±5% coulomb count. | Used where precise state-of-charge is critical but system already has a discrete regulator. | Select MAX17055G+T when coulomb counting alone is insufficient and voltage-based SOC modeling is preferred. |
| TPS62745DRYR | Ultra-low-IQ buck converter (360nA) without coulomb counter; fixed 3.3V output; no I²C interface. | Deployed in cost-sensitive sensor nodes where battery telemetry is unnecessary. | Choose TPS62745DRYR for pure power conversion where battery monitoring is handled externally or omitted. |
Compared with MAX17055G+T and TPS62745DRYR, the LTC3335EUDC#TRPBF uniquely integrates regulation and coulomb counting in one QFN package, eliminating inter-IC communication latency and reducing system-level power budget uncertainty by correlating discharge directly with delivered energy.
Availability
LTC3335EUDC#TRPBF is available at Aetrix Electronics and suitable for wireless sensor nodes, remote industrial monitors, and Dust Networks® SmartMesh® endpoints requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3335EUDC#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 digital signal processing semiconductors.
The LTC3335EUDC#TRPBF belongs to Linear's nanopower DC/DC product line, engineered specifically for energy-constrained battery-powered systems where runtime, accuracy, and integration are critical design parameters.
FAQ
What is the minimum input voltage required for the LTC3335EUDC#TRPBF to regulate output?
The LTC3335EUDC#TRPBF maintains regulation down to 1.8V input across all output voltage settings. Below this threshold, the device ceases switching and enters shutdown, preserving battery energy. This 1.8V minimum enables compatibility with deeply discharged primary cells such as LiSOCl₂ and alkaline batteries commonly used in multi-year deployments.
How does the LTC3335EUDC#TRPBF achieve ±5% coulomb counting accuracy?
The LTC3335EUDC#TRPBF achieves ±5% total unadjusted coulomb counter error through real-time compensation of IPEAK measurement against process, temperature, and supply variations. Each AC(ON) cycle's charge transfer is calculated using an internally adjusted ON-time metric, and the 50-bit counter accumulates these values with zero-inductor-current synchronization to prevent error accumulation during sleep transitions.
Can the LTC3335EUDC#TRPBF operate with a 2.2mH inductor?
Yes-the LTC3335EUDC#TRPBF supports inductors from 2.2mH down to 47µH depending on IPEAK setting. A 2.2mH inductor is recommended for the 5mA IPEAK configuration, enabling ultra-low battery current draw ideal for microampere-load applications like environmental sensors with infrequent wake-ups.
What happens to the coulomb counter during LTC3335EUDC#TRPBF sleep mode?
During sleep mode, the LTC3335EUDC#TRPBF holds the coulomb counter state without incrementing and draws zero current from the counter circuitry. The accumulated charge value remains intact in the internal 50-bit register chain and is fully accessible via I²C upon wake-up, ensuring no data loss during extended low-power intervals.
Is the LTC3335EUDC#TRPBF pin-compatible with other members of the LTC333x family?
No-the LTC3335EUDC#TRPBF is not pin-compatible with LTC3330/LTC3331/LTC3332. While sharing functional similarities, its 20-pin QFN layout, dedicated IPK[2:0] and OUT[2:0] pins, and integrated coulomb counter require unique PCB routing. Migration requires board redesign; refer to the LTC3335-specific pin configuration diagram for layout validation.
LTC3335EUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 50mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3335EUDC#TRPBF FAQ
1.How can I place an order for LTC3335EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3335EUDC#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 LTC3335EUDC#TRPBF reliable?
The price and inventory of LTC3335EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3335EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3335EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3335EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3335EUDC#TRPBF?
LTC3335EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3335EUDC#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 LTC3335EUDC#TRPBF?
For technical support, including LTC3335EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3335EUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3335EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3335EUDC#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 LTC3335EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3335EUDC#TRPBF?
All LTC3335EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3335EUDC#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 LTC3335EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3335EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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