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Analog Devices Inc. LTC3104IDE#TRPBF
- Part No.:
- LTC3104IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3104IDE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
LTC3104IDE#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 2.5V–15V input and 0.6V–13.8V output ranges. It features 2.6µA quiescent current in Burst Mode, 1.2MHz fixed-frequency PWM operation, and power-good status output - optimized for ultralow-power remote sensor networks and energy harvesting systems.
For engineers reviewing the LTC3104IDE#TRPBF datasheet, LTC3104IDE#TRPBF pinout, LTC3104IDE#TRPBF application, or LTC3104IDE#TRPBF equivalent, key selection criteria include light-load efficiency trade-offs between Burst Mode and forced continuous mode, dual-regulation capability (buck + LDO), thermal shutdown behavior, and precise RUN pin undervoltage lockout threshold configuration.
Technical Context
The LTC3104IDE#TRPBF implements a current-mode control architecture with internal slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual-loop design independently regulates the main buck output (via FB pin) and the auxiliary LDO output (via FBLDO pin), each with dedicated feedback paths and error amplifiers.
It supports two mutually exclusive operating modes: automatic Burst Mode (MODE ≥ 1.2V), enabling 2.6µA no-load supply current and dynamic transition between PWM and burst pulses, and forced continuous conduction (MODE ≤ 0.5V), delivering constant 1.2MHz switching with minimized output ripple and noise - both modes retain full protection features including thermal shutdown, PGOOD monitoring, and peak-current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports multicell Li-ion, supercapacitor, and wide-input industrial rails without external pre-regulation. |
| Output Current (Buck) | 300mA - sufficient to power microcontrollers, RF transceivers, and analog sensors directly from a single IC. |
| Quiescent Current (Burst Mode) | 2.6µA - enables multi-year battery life in intermittently active IoT endpoints. |
| Switching Frequency | 1.2MHz (fixed) - allows use of compact 10µH inductors and reduces EMI filtering burden. |
| LDO Output Current | 10mA - powers noise-sensitive analog circuitry (e.g., ADC references, op-amps) with independent regulation. |
| Feedback Reference Voltage | 0.6V (buck), 0.6V (LDO) - enables low-voltage rail generation down to 0.6V with standard resistor dividers. |
| Power Good Threshold | −10% hysteresis on FB - provides reliable system reset signaling during brown-out conditions. |
Pinout & Package
Package: 14-Lead (4mm × 3mm) Plastic DFN with exposed thermal pad (Pin 15 = GND). Thermally enhanced layout requires soldering exposed pad to PCB ground plane for θJA = 53°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 2.5V–15V; must be decoupled with ≥10µF ceramic capacitor adjacent to pin. |
| SW | Switch node | Connects to inductor; carries high di/dt switching waveform - critical for EMI and layout integrity. |
| BST | Bootstrap supply for high-side gate drive | Requires 22nF capacitor to SW; enables N-channel high-side MOSFET operation without external charge pump. |
| GND | Power ground reference | Pins 5 and 15 (exposed pad) must be tied to common low-impedance ground plane. |
| MODE | Operation mode select | High (≥1.2V) enables Burst Mode; low (≤0.5V) forces continuous 1.2MHz PWM. |
| RUN | Enable comparator input | Threshold = 0.8V; 60mV hysteresis enables precise UVLO using external resistor divider. |
| FB | Buck output voltage feedback | 0.6V reference - sets VOUT via R1/R2 divider; supports remote sensing with Kelvin connection. |
| FBLDO | LDO output voltage feedback | 0.6V reference - sets VLDO independently; allows separate regulation from buck output. |
| VLDO | LDO regulated output | Delivers up to 10mA; stable with ≥4.7µF ceramic output capacitor; dropout = 150mV @ 10mA. |
| VINLDO | LDO input supply | 2.5V–15V range; may be tied to VIN or to buck VOUT for cascaded regulation. |
| PGOOD | Open-drain power-good indicator | Pulls low if VOUT drops >10% below regulation, during thermal shutdown, or when disabled. |
| RUNLDO | LDO enable control | High (>0.8V) enables LDO; low (<0.5V) disables it independently of buck operation. |
| VCC | Internally regulated bias rail | ~3.3V internal supply; decouple with ≥1µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.6µA in Burst Mode - extends battery life in always-on, low-duty-cycle sensor nodes. |
| Dual independent regulators | Buck (300mA) + LDO (10mA) - eliminates need for discrete post-regulator in mixed-signal systems. |
| User-selectable operating mode | Hardware-configurable MODE pin - enables deterministic trade-off between efficiency and noise without firmware. |
| Integrated protection suite | Thermal shutdown (150°C), overcurrent limit (≥400mA), UVLO (2.1V), and PGOOD fault reporting - reduces external supervision components. |
| Internal slope compensation | Prevents subharmonic oscillation at >50% duty cycle - ensures stable regulation across full VIN/VOUT range without external compensation. |
Applications
| Remote Sensor Node Power | Distributed Energy Harvesting System |
|---|---|
Use Scenario: Battery- or harvester-powered environmental sensor transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Primary power management IC providing regulated 3.3V for MCU and 1.8V for RF transceiver, with LDO isolating sensitive analog front-end. Use Value: 2.6µA sleep current enables >10-year CR2032 battery life; Burst Mode minimizes conversion loss during brief active periods. | Use Scenario: Indoor light-harvesting node powering BLE beacon using amorphous silicon PV cell and supercapacitor buffer. IC Role / Device Role / Timing Role: Wide-input buck regulator stepping down variable 2.8V–12V harvester output to stable 3.0V, with LDO cleaning ripple for precision ADC reference. Use Value: 2.5V minimum VIN supports startup from weak illumination; 15V absolute max rating protects against supercap overvoltage events. |
| Multicell Battery-Powered Instrument | Low-Power Wireless Transceiver Supply |
Use Scenario: Handheld gas detector using 3×AA alkaline stack (4.5V–6.0V) powering 32-bit ARM Cortex-M0+ and electrochemical sensor array. IC Role / Device Role / Timing Role: Main DC/DC converter generating 3.3V system rail and LDO-supplied 2.5V reference for 16-bit ADC. Use Value: Internal soft-start (1.4ms) prevents inrush into large capacitive loads; accurate RUN threshold enables programmable brown-out reset at 4.2V. | Use Scenario: Sub-GHz ISM band transceiver module requiring ultra-low-noise 1.8V supply for PLL and 3.3V for digital baseband. IC Role / Device Role / Timing Role: Dual-output regulator: buck supplies 3.3V digital domain; LDO delivers clean 1.8V analog/RF domain with 4.7µF stability. Use Value: Forced continuous mode eliminates burst harmonics that could desensitize receiver; PGOOD synchronizes RF enable sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down + LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (300nA), but only buck (no integrated LDO); 0.6V–5.5V VOUT; 1.8MHz switching. | Suitable where LDO is unnecessary or can be added externally; better for extreme battery life, worse for noise isolation. | Select when minimizing sleep current is paramount and system has separate LDO or low-noise requirement is met by other means. |
| MAX17651ATP+ | Higher output current (600mA), includes PMBus interface and telemetry; no integrated LDO; 4.5V–60V input. | Targeted at industrial power rails with monitoring needs; lacks ultralow-IQ and dual-regulation capability. | Select when higher current, wide VIN, or digital configurability outweighs need for integrated LDO and sub-µA sleep performance. |
Compared with TPS62840DLCR and MAX17651ATP+, the LTC3104IDE#TRPBF uniquely combines ultralow 2.6µA quiescent current, integrated 10mA LDO, and hardware-selectable Burst/continuous modes - making it optimal for space-constrained, battery-limited systems requiring both efficiency and analog noise immunity.
Availability
LTC3104IDE#TRPBF is available at Aetrix Electronics and suitable for remote sensor networks, distributed energy harvesting systems, and multicell battery-powered instruments requiring stable component supply across extended product lifecycles.
Supply support for LTC3104IDE#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 and maintains its high-performance analog and power management portfolio under the ADI brand.
The LTC3104IDE#TRPBF belongs to Linear's ultralow-quiescent-current DC/DC converter family, designed specifically for energy-constrained applications such as wireless sensor nodes, wearables, and energy harvesting systems where micropower efficiency and dual-rail regulation are essential.
FAQ
What is the guaranteed operating temperature range for the LTC3104IDE#TRPBF?
The LTC3104IDE#TRPBF is rated for −40°C to +125°C junction temperature. This "I-grade" specification ensures reliable operation in automotive under-hood, industrial control, and outdoor sensor environments where ambient temperatures exceed commercial grade limits. The DFN package's exposed pad must be soldered to PCB copper for thermal compliance.
How does the MODE pin affect efficiency and noise in the LTC3104IDE#TRPBF?
The MODE pin selects between two distinct operational states: high voltage (≥1.2V) enables automatic Burst Mode, reducing no-load input current to 2.6µA but introducing low-frequency output ripple; low voltage (≤0.5V) forces continuous 1.2MHz PWM, eliminating burst artifacts but increasing light-load current to ~600µA. The LTC3104IDE#TRPBF's hardware-based selection avoids firmware dependency and guarantees deterministic behavior.
Can the LTC3104IDE#TRPBF power both a microcontroller and an RF transceiver simultaneously?
Yes - the LTC3104IDE#TRPBF delivers 300mA from its buck regulator for digital loads (e.g., ARM Cortex-M core) and provides a separate 10mA LDO output for noise-sensitive RF/analog circuits (e.g., BLE transceiver VDD_RF or ADC reference). This dual-regulation architecture prevents switching noise coupling, and the LDO's 4.7µF stability enables direct integration without additional filtering.
What protection features are integrated into the LTC3104IDE#TRPBF?
The LTC3104IDE#TRPBF includes thermal shutdown (150°C trip), overcurrent limiting (≥400mA peak), input undervoltage lockout (2.1V), and open-drain PGOOD fault signaling. During thermal fault, both buck and LDO are disabled; PGOOD pulls low during UVLO, overtemperature, or output undervoltage - enabling system-level fault recovery without external supervisors.
Is the LTC3104IDE#TRPBF compatible with ceramic output capacitors only, or can electrolytic types be used?
The LTC3104IDE#TRPBF is optimized for ceramic output capacitors: ≥4.7µF for the LDO (VLDO) and ≥22µF for the buck output (VOUT), as specified in the typical application circuit. While aluminum polymer or tantalum capacitors may function, they introduce ESR-dependent instability risks and degrade transient response. Ceramic capacitors ensure guaranteed stability, minimal size, and compatibility with the IC's internal compensation.
LTC3104IDE#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)
LTC3104IDE#TRPBF FAQ
1.How can I place an order for LTC3104IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3104IDE#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 LTC3104IDE#TRPBF reliable?
The price and inventory of LTC3104IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3104IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3104IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3104IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3104IDE#TRPBF?
LTC3104IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3104IDE#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 LTC3104IDE#TRPBF?
For technical support, including LTC3104IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3104IDE#TRPBF requirements.
6.How does Aetrix verify that LTC3104IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3104IDE#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 LTC3104IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3104IDE#TRPBF?
All LTC3104IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3104IDE#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 LTC3104IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3104IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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