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Analog Devices Inc. LTC3104EDE#TRPBF
- Part No.:
- LTC3104EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3104EDE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,317
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Product details
Overview
LTC3104EDE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter with integrated 10mA adjustable LDO, delivering up to 300mA output current across 0.6V–13.8V VOUT, operating from 2.5V–15V input, and achieving 95% peak efficiency. It serves as primary power regulation in ultra-low-power systems where quiescent current and noise sensitivity are critical - e.g., energy harvesting nodes powering wireless sensor transceivers.
For engineers reviewing the LTC3104EDE#TRPBF datasheet, LTC3104EDE#TRPBF pinout, LTC3104EDE#TRPBF application, or LTC3104EDE#TRPBF equivalent, key selection criteria include its 2.6µA no-load quiescent current in Burst Mode, user-selectable forced continuous mode (1.2MHz fixed-frequency PWM), accurate RUN comparator for programmable UVLO, PGOOD status flag, and dual-regulation capability (buck + LDO) in a thermally enhanced 14-lead DFN package.
Technical Context
The LTC3104EDE#TRPBF implements a current-mode synchronous buck architecture with internal N-channel MOSFETs (0.65Ω main switch, 0.85Ω synchronous rectifier), slope-compensated PWM control, and independent LDO regulation powered from VINLDO. Its dual-mode operation-Burst Mode for sub-3µA light-load IQ and forced continuous for low-noise 1.2MHz switching-is selected via the MODE pin.
It integrates thermal shutdown (150°C trip), undervoltage lockout (2.1V rising threshold), soft-start (1.4ms typical), and a precision RUN comparator (0.8V threshold, 60mV hysteresis). The PGOOD output asserts low when VFB falls >10% below regulation or during fault conditions, with 1ms enable delay and built-in deglitching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 15V - supports multicell Li-ion, supercapacitor, and wide-input industrial rails without external pre-regulation. |
| IOUT (Buck) | 300mA continuous - sufficient for powering microcontrollers, RF transceivers, and analog front-ends in compact batteryless systems. |
| IQ (Burst Mode) | 2.6µA at no load - enables multi-year operation from small energy harvesters (e.g., thermoelectric or piezoelectric sources). |
| Switching Frequency | 1.2MHz fixed (forced continuous) - allows use of small, low-profile inductors (e.g., 10µH) and minimizes EMI filtering footprint. |
| LDO Output | Adjustable 0.6V–14.5V, 10mA - powers noise-sensitive circuits (e.g., ADC references, PLLs) independently of buck output ripple. |
| Feedback Voltage | 0.6V ±2% - enables precise output setting with standard resistor dividers; low reference reduces divider current and improves light-load accuracy. |
| PGOOD Threshold | –10% VFB (typical) - provides reliable power-good signaling for system sequencing and brownout detection. |
Pinout & Package
Package: 14-lead (4mm × 3mm × 0.75mm) plastic DFN with exposed pad (Pin 15 = GND), θJA = 53°C/W, requiring soldered thermal pad for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 2.5V–15V; requires ≥10µF local ceramic decoupling; powers buck controller and internal circuitry. |
| SW | Switch node | Connects to inductor; carries high di/dt switching current; must be routed with minimal loop area to reduce EMI. |
| BST | Bootstrap supply for high-side gate drive | Requires 22nF capacitor to SW; enables efficient N-MOS high-side drive without external charge pump. |
| GND | Power ground (Pins 5 & 15) | Pins 5 and exposed pad (15) are common GND; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| MODE | Operation mode select | High (>1.2V) = automatic Burst Mode; low (<0.5V) = forced continuous; determines light-load efficiency vs. noise trade-off. |
| RUN | Enable comparator input | Enables converter when >0.8V; configurable as precise UVLO using external resistor divider from VIN. |
| FB | Buck feedback input | Connects to resistor divider from VOUT; sets regulated output voltage with 0.6V reference. |
| FBLDO | LDO feedback input | Connects to resistor divider from VLDO; sets LDO output voltage with 0.6V reference. |
| VLDO | LDO output | Delivers up to 10mA; requires ≥4.7µF local ceramic decoupling; stable with arbitrarily large output capacitance. |
| VINLDO | LDO input supply | Accepts 2.5V–15V; may be tied to VIN, VOUT, or independent rail; decouple with ≥10µF ceramic capacitor. |
| PGOOD | Open-drain power-good indicator | Pulls low if VOUT drops >10%, during thermal shutdown, or when disabled; requires external pull-up to ≤6V. |
| RUNLDO | LDO enable control | High (>0.8V) enables LDO; low (<0.5V) disables LDO independently of buck operation. |
| VCC | Internally regulated bias rail | ~3.3V internal supply; decouple with ≥1µF ceramic capacitor; powers control logic and error amplifiers. |
| NC | No-connect | Pins 1, 8, 9, and 14 are NC; must be connected to GND per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.6µA in Burst Mode - extends operational lifetime in energy-constrained applications like remote environmental sensors. |
| Dual independent regulation | Synchronous buck (300mA) + adjustable LDO (10mA) - enables clean, isolated power domains for mixed-signal SoCs without extra ICs. |
| User-selectable operating modes | Burst Mode (efficiency-optimized) or forced continuous (noise-optimized) - selectable via single MODE pin, no external components required. |
| Integrated protection suite | Thermal shutdown (150°C), UVLO (2.1V), short-circuit foldback, and PGOOD fault signaling - reduces need for external supervision circuitry. |
| Internal compensation | Single-feedback-loop compensation - eliminates external compensation network, simplifying design and improving board-level reliability. |
| Pre-biased start-up support | Starts into pre-charged output without reverse current - essential for hot-swap and backup power applications where VOUT may be non-zero at enable. |
Applications
| Remote Sensor Networks | Distributed Power Systems |
|---|---|
Use Scenario: Wireless soil moisture and temperature nodes powered by thermoelectric generators in agricultural IoT deployments. IC Role / Device Role / Timing Role: Primary power regulator converting variable harvester output (3–12V) to stable 3.3V for MCU and sub-GHz radio, while supplying 1.8V LDO output for RF synthesizer. Use Value: 2.6µA quiescent current enables >5-year field life on milliwatt-scale harvesters; Burst Mode ensures efficient operation across diurnal load cycles. |
Use Scenario: Modular industrial sensor hubs with separate analog signal conditioning, digital processing, and communication sections. IC Role / Device Role / Timing Role: Central point-of-load regulator generating 5V for digital logic and 3.3V for analog front-end, with dedicated LDO for precision ADC reference. Use Value: Dual-output capability eliminates discrete LDO, reducing BOM count and PCB area; 1.2MHz switching enables compact 1210-size inductors. |
| Energy Harvesters | Low-Power Wireless Systems |
Use Scenario: Piezoelectric vibration-powered condition monitoring sensors on rotating machinery. IC Role / Device Role / Timing Role: Buck converter stepping down intermittent, low-current harvester output (4–15V) to 2.2V for ultra-low-power MCU, with LDO providing ripple-free 1.2V for real-time clock. Use Value: Wide 2.5V–15V input range accommodates unregulated harvester transients; 0.6V feedback reference improves accuracy at low output voltages. |
Use Scenario: Bluetooth LE beacon modules powered by coin-cell batteries in asset tracking tags. IC Role / Device Role / Timing Role: Efficient step-down from 3V battery to 1.8V MCU core and 3.0V radio PA supply, with LDO isolating sensitive RF circuitry from switching noise. Use Value: Forced continuous mode suppresses switching harmonics near 2.4GHz ISM band; PGOOD enables safe firmware boot sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck + LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (300nA), but only 2A buck (no integrated LDO); requires external LDO for dual-rail needs. | Best for single-rail, extreme-ultra-low-power apps (e.g., NFC tags); unsuitable where isolated LDO output is mandatory. | Select when lowest possible IQ dominates and LDO functionality can be added externally. |
| MAX20004AATP+T | Higher IQ (12µA), includes watchdog timer and I²C interface; no integrated LDO. | Targeted at automotive ASIL-B systems requiring diagnostics; lacks LDO and Burst Mode optimization for energy harvesting. | Choose for functional safety compliance in automotive body electronics, not for batteryless or ultra-low-IQ designs. |
Compared with LTC3104EDE#TRPBF, TPS62840DLCR offers dramatically lower quiescent current but forces external LDO integration, increasing complexity and cost; MAX20004AATP+T adds safety features irrelevant to portable/energy-harvesting use cases while sacrificing the critical 2.6µA IQ and dual-regulator architecture.
Availability
LTC3104EDE#TRPBF is available at Aetrix Electronics and suitable for remote sensor networks, energy harvesting systems, and low-power wireless systems requiring stable component supply, long-lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LTC3104EDE#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3104 belongs to Linear's ultralow-quiescent-current power management family, designed specifically for energy-constrained applications including energy harvesting, batteryless sensors, and always-on portable instrumentation.
FAQ
What is the minimum input voltage required for the LTC3104EDE#TRPBF to start switching?
The LTC3104EDE#TRPBF has an internal undervoltage lockout (UVLO) with a rising threshold of 2.1V (typical). However, startup into a pre-biased output is supported, and the device can begin switching once VIN exceeds the UVLO threshold and the RUN pin is enabled. For reliable startup under all conditions, VIN should be ≥2.5V per datasheet specifications.
Can the LTC3104EDE#TRPBF operate with the LDO disabled while the buck converter remains active?
Yes. The LTC3104EDE#TRPBF allows independent control: pulling RUNLDO below 0.5V disables the LDO while leaving the buck converter fully operational. This is confirmed in the "LDO Regulator" section of the datasheet, where VLDO is explicitly stated to be active only when both VIN > UVLO threshold and RUNLDO is high.
Does the LTC3104EDE#TRPBF support start-up into a pre-biased output voltage?
Yes. The LTC3104EDE#TRPBF supports start-up into a pre-biased output, as verified in the Typical Performance Characteristics section (Figures G14–G17) and explicitly described in the "Start-Up into Pre-Biased Output" subsection. Its architecture prevents reverse current flow during this condition, protecting downstream circuitry.
What is the maximum allowable voltage on the BST pin of the LTC3104EDE#TRPBF?
The absolute maximum rating for the BST pin is (SW + 6V), as specified in the Absolute Maximum Ratings table. Since SW swings between GND and VIN, BST voltage reaches up to VIN + VBOOT; the internal boost circuit ensures sufficient gate drive margin, and the 22nF BST capacitor must be rated for ≥16V to accommodate worst-case VIN = 15V plus overshoot.
How does the MODE pin affect efficiency and output noise in the LTC3104EDE#TRPBF?
When MODE is high (>1.2V), the LTC3104EDE#TRPBF enters automatic Burst Mode, reducing IQ to 2.6µA at light loads but introducing low-frequency output voltage ripple. When MODE is low (<0.5V), it operates in forced continuous mode at 1.2MHz, eliminating burst-related ripple and harmonics but raising IQ to ~600µA - a deliberate trade-off between efficiency and noise performance.
LTC3104EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 1.2MHz
- Voltage/Current - Output 1:
- 0.6V ~ 13.8V, 300mA
- Voltage/Current - Output 2:
- 0.6V ~ 14.5V, 10mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.5V ~ 15V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3104EDE#TRPBF FAQ
1.How can I place an order for LTC3104EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3104EDE#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 LTC3104EDE#TRPBF reliable?
The price and inventory of LTC3104EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3104EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3104EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3104EDE#TRPBF transactions.
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4.How is shipping managed for LTC3104EDE#TRPBF?
LTC3104EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3104EDE#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 LTC3104EDE#TRPBF?
For technical support, including LTC3104EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3104EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3104EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3104EDE#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 LTC3104EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3104EDE#TRPBF?
All LTC3104EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3104EDE#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 LTC3104EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3104EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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