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Analog Devices Inc. LTC3335IUDC#PBF
- Part No.:
- LTC3335IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3335IUDC#PBF.pdf
- Description:
- IC REG BUCK BST PROG 50MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LTC3335IUDC#PBF from Analog Devices (formerly Linear Technology) is a nanopower buck-boost DC/DC converter with integrated precision coulomb counter, designed for ultra-long-life primary-cell battery applications. It delivers up to 50mA output current, operates down to 1.8V input, features 680nA quiescent current in regulation, and provides eight pin-selectable output voltages (1.8V–5V) - enabling precise power management in wireless sensors and remote monitors.
For engineers reviewing the LTC3335IUDC#PBF datasheet, LTC3335IUDC#PBF pinout, LTC3335IUDC#PBF application, or LTC3335IUDC#PBF equivalent, key selection criteria include I²C-accessible battery discharge tracking, programmable peak input current (5–250mA), ±5% coulomb measurement accuracy, and low-profile 3mm × 4mm QFN-20 packaging compatible with space-constrained IoT endpoints.
Technical Context
The LTC3335IUDC#PBF implements a hysteretic buck-boost topology using four internal MOSFETs (A–D) arranged as an H-bridge, enabling seamless operation across input voltages below or above the regulated output. Its sleep/wake control uses dual thresholds (sleep and wake-up) to minimize switching loss at light loads while maintaining regulation via output capacitor hold-up.
Coulomb counting is performed by measuring accumulated charge per AC(ON) cycle - where switch A/C conduction time is digitally adjusted to compensate for IPEAK variation - and summing 8-bit increments into a 50-bit internal counter. The I²C interface exposes only the 8 MSBs of the accumulated charge register (Register C), with qLSB resolution programmable 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 pre-regulation. |
| Quiescent Current (Regulated) | 680nA - enables >10-year runtime on 2.4Ah primary cells at µA-level average load. |
| 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 and battery impedance for optimal efficiency. |
| Coulomb Counter Accuracy | ±5% total unadjusted error - validated over temperature and input voltage for reliable battery depletion forecasting. |
| I²C Interface | Standard-mode (400kHz) - provides read/write access to accumulated charge, alarm threshold, and status registers. |
| Package | 20-lead 3mm × 4mm QFN (UDC), 0.75mm height - exposes PGND pad for thermal and low-impedance grounding. |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN (UDC) with exposed PGND pad (Pin 21), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1) | I²C data bidirectional line | Level-shifted to DVCC; requires pull-up to DVCC; enables real-time battery discharge readout and alarm configuration. |
| DVCC (2) | I²C logic supply reference | Sets SDA/SCL input thresholds; may be tied to BAT, VOUT, or external rail (1.8–5.5V); decouples digital interface from power path. |
| OUT[2:0] (3–5) | Output voltage select inputs | Three-pin binary code selects one of eight fixed VOUT values; no external components needed for regulation. |
| BAT (7) / PBAT (8) | Input voltage sense / power input | BAT is sense node; PBAT is power input - must be shorted externally; enables accurate input monitoring independent of trace IR drop. |
| SW1 (9) / SW2 (10) | Internal switch node terminals | Connect external inductor between SW1 and SW2; defines energy transfer path for buck, boost, or buck-boost operation. |
| PVOUT (11) / VOUT (12) | Output power / output voltage sense | PVOUT delivers regulated power; VOUT is dedicated sense pin - improves regulation accuracy by rejecting PCB trace resistance. |
| IPK[2:0] (13–15) | Peak input current select inputs | Binary code sets IPEAK from 5mA to 250mA; determines inductor size, battery stress, and light-load efficiency trade-offs. |
| EN (16) | Enable control input | Active-high; disables regulator but retains coulomb counter state and register contents during shutdown. |
| PGOOD (18) | Power-good status output | Open-drain, DVCC-referenced; asserts low until VOUT reaches sleep threshold; used for system power sequencing. |
| IRQ (19) | Interrupt request output | Active-low; signals coulomb alarm threshold breach or counter overflow; supports wake-from-sleep event handling. |
| SCL (20) | I²C clock input | Level-shifted to DVCC; synchronizes register reads/writes; supports multi-drop bus with other I²C peripherals. |
| PGND (21) | Power ground (exposed pad) | Mandatory solder connection to PCB ground plane; carries high-switching currents; critical for thermal performance and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic buck-boost regulation | Eliminates external compensation; achieves stable regulation across 1.8–5.5V input with zero external feedback components. |
| Integrated coulomb counter | Measures accumulated battery discharge with ±5% accuracy and stores result in I²C-accessible register; enables predictive battery replacement. |
| Programmable discharge alarm | Configurable threshold triggers IRQ pin assertion - allows host MCU to initiate low-power shutdown or alert before battery exhaustion. |
| Ultra-low quiescent current | 680nA in regulation mode extends primary-cell lifetime beyond 10 years in µA-average IoT sensor nodes. |
| Wide IPEAK programmability | Eight discrete settings (5–250mA) let designers optimize inductor size, battery pulse capability, and efficiency vs. load profile. |
| Dual-threshold sleep/wake control | Reduces switching losses at light loads while ensuring fast (<3µs) wake-up response when output droops below wake-up threshold. |
Applications
| Wireless Sensor Nodes | Remote Asset Monitors |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 15 minutes via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Primary power regulator and battery fuel gauge - maintains 3.3V MCU/radio rail while logging cumulative discharge. Use Value: Enables >12-year deployment on a single AA LiSOCl₂ cell by minimizing sleep current and providing accurate end-of-life prediction. |
Use Scenario: Industrial vibration monitor mounted on rotating machinery, operating unattended for years. IC Role / Device Role / Timing Role: Regulates power for MEMS accelerometer and microcontroller; tracks battery depletion via I²C to schedule maintenance. Use Value: Prevents unexpected downtime by triggering alerts when remaining capacity falls below 10%, based on ±5% coulomb accuracy. |
| Dust Networks® SmartMesh® Endpoints | Low-Power Environmental Loggers |
|
Use Scenario: Self-healing mesh network node powered by primary lithium battery in remote utility metering. IC Role / Device Role / Timing Role: Provides regulated 2.5V rail for RF transceiver and microcontroller; uses IRQ pin to wake host on battery alarm. Use Value: Ensures network reliability by maintaining precise voltage regulation across wide battery voltage range (3.6V → 2.0V) without brownouts. |
Use Scenario: Subsurface soil moisture logger deployed in agricultural fields with no access to charging infrastructure. IC Role / Device Role / Timing Role: Powers ADC, microcontroller, and EEPROM; accumulates discharge data stored locally and reported periodically. Use Value: Delivers 15+ year field life using 3.6V lithium thionyl chloride cell, validated by coulomb counter drift <±0.5%/year at 25°C. |
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 |
|---|---|---|---|
| MAX17222ETA+T | No integrated coulomb counter; only 300nA IQ; fixed 3.3V output; no I²C interface. | Suitable for simpler energy harvesting or fixed-voltage sensor nodes where battery telemetry is unnecessary. | Select when coulomb counting is not required and lowest possible IQ is critical - but accept loss of battery state visibility. |
| BQ25504RGTT | Includes MPPT for energy harvesting; 450nA IQ; coulomb counter with 12-bit resolution; requires external LDO for clean digital rail. | Better suited for solar/battery hybrid systems; adds complexity with MPPT loop and separate DVDD supply. | Choose for ambient energy harvesting integration; avoid if design uses primary battery only and requires minimal BOM count. |
Compared with MAX17222ETA+T and BQ25504RGTT, the LTC3335IUDC#PBF uniquely combines ultra-low IQ, pin-selectable outputs, and a calibrated coulomb counter in a single 3mm × 4mm package - making it optimal for long-life, battery-only IoT endpoints requiring predictive maintenance capability.
Availability
LTC3335IUDC#PBF is available at Aetrix Electronics and suitable for wireless sensor nodes, remote asset monitors, Dust Networks® SmartMesh® endpoints, and low-power environmental loggers requiring stable component supply across extended product lifecycles.
Supply support for LTC3335IUDC#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 its legacy of high-performance power management ICs with rigorous automotive and industrial qualification.
The LTC3335IUDC#PBF belongs to Linear's nanopower DC/DC converter family, engineered specifically for multi-year battery operation in constrained IoT edge devices where coulomb-level battery telemetry is essential.
FAQ
What is the minimum input voltage supported by the LTC3335IUDC#PBF?
The LTC3335IUDC#PBF supports an input voltage range from 1.8V to 5.5V. This allows direct operation from a single primary-cell battery - including LiSOCl₂, alkaline, or LiMnO₂ - down to end-of-discharge voltage without requiring external boost circuitry. Operation below 1.8V is not guaranteed and may result in regulation loss or coulomb counter inaccuracy.
How does the LTC3335IUDC#PBF achieve ±5% coulomb counter accuracy?
The LTC3335IUDC#PBF achieves ±5% total unadjusted coulomb counter accuracy by digitally compensating for IPEAK variation per AC(ON) cycle using internal calibration. Each conduction period is measured and adjusted in real time to offset process, voltage, and temperature drift - then converted to an 8-bit charge increment added to the 50-bit accumulator. This method avoids reliance on absolute MOSFET RDS(ON) matching.
Can the LTC3335IUDC#PBF be used with rechargeable batteries?
The LTC3335IUDC#PBF is optimized for primary-cell battery applications and does not include charge termination, safety timers, or battery chemistry-specific protection. While it can regulate from Li-ion or NiMH sources within its 1.8V–5.5V input range, it lacks built-in recharge control - so external charging circuitry must manage battery health, and coulomb counter readings will reflect net discharge only, not charge cycles.
What is the role of the DVCC pin on the LTC3335IUDC#PBF?
The DVCC pin on the LTC3335IUDC#PBF sets the logic reference voltage for the I²C interface (SDA and SCL), defining input thresholds and output drive levels. It may be connected to BAT, VOUT, or a separate 1.8V–5.5V supply - allowing level-shifting between the host MCU's I/O domain and the LTC3335IUDC#PBF's power domain, which improves noise immunity and ensures I²C compliance across mixed-rail systems.
How is the output voltage selected on the LTC3335IUDC#PBF?
The output voltage on the LTC3335IUDC#PBF is selected using three logic inputs - OUT2, OUT1, and OUT0 (Pins 3–5) - configured as a binary code. Each combination sets a precise, factory-trimmed output: e.g., 100 = 3.3V, 011 = 3.0V. These pins must be hard-wired to either BAT (logic high) or GNDA (logic low); floating states are undefined and may cause regulation failure or increased quiescent current.
LTC3335IUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3335IUDC#PBF FAQ
1.How can I place an order for LTC3335IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3335IUDC#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 LTC3335IUDC#PBF reliable?
The price and inventory of LTC3335IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3335IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3335IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3335IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3335IUDC#PBF?
LTC3335IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3335IUDC#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 LTC3335IUDC#PBF?
For technical support, including LTC3335IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3335IUDC#PBF requirements.
6.How does Aetrix verify that LTC3335IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3335IUDC#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 LTC3335IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3335IUDC#PBF?
All LTC3335IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3335IUDC#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 LTC3335IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3335IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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