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Analog Devices Inc. LTC7124IUDD#TRPBF
- Part No.:
- LTC7124IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7124IUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
LTC7124IUDD#TRPBF from Analog Devices is a dual-channel, monolithic synchronous step-down DC/DC regulator delivering up to 3.5A per channel across input voltages of 3.1V–17V and output voltages adjustable from 0.6V to 99% of VIN. It integrates 80mΩ/40mΩ N-channel MOSFETs, supports programmable switching frequency (500kHz–4MHz), and achieves <8μA no-load quiescent current with both channels enabled - enabling high-efficiency power conversion in battery-powered instrumentation and portable scanners.
For engineers reviewing the LTC7124IUDD#TRPBF datasheet, LTC7124IUDD#TRPBF pinout, LTC7124IUDD#TRPBF application, or LTC7124IUDD#TRPBF equivalent, key selection criteria include ultralow IQ operation, dual-output phase control, spread spectrum noise reduction, ±1.0% VOUT accuracy, and thermal performance in the 3mm × 5mm QFN-24 package with exposed GND pad.
Technical Context
The LTC7124IUDD#TRPBF employs peak-current-mode control with independent error amplifiers per channel, enabling fast line/load transient response and stable operation across wide VIN/VOUT ranges. Its dual-channel architecture operates 180° out of phase to reduce input ripple current and simplify EMI filtering.
Each channel features configurable operating modes - Burst Mode® (≤8μA IQ), pulse-skipping, or forced continuous - selected via MODE/SYNC voltage level or external clock sync (±25% range). Internal/external loop compensation is supported via ITH1/ITH2 pins, and current limit scaling (full/half) is controlled by ILIM pin state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 17V - supports wide-input industrial and automotive battery rails without pre-regulation. |
| Output Current per Channel | Up to 3.5A - enables dual high-current PoL supplies from single compact IC. |
| Quiescent Current | <8μA (both channels active, no load) - extends battery life in always-on portable systems. |
| Switching Frequency | 500kHz to 4MHz (RT-programmable); ±25% sync range - allows EMI optimization and inductor size reduction. |
| Output Voltage Accuracy | ±1.0% over temperature - ensures stable reference for precision analog or FPGA core rails. |
| Integrated MOSFETs | 80mΩ top / 40mΩ bottom N-channel - eliminates external FETs and reduces BOM count and layout area. |
| Package | 24-lead 3mm × 5mm QFN with exposed thermal pad - delivers θJA = 22°C/W for high-power density thermal management. |
Pinout & Package
The LTC7124IUDD#TRPBF is housed in a thermally enhanced 24-lead plastic QFN (UDD package), 3mm × 5mm footprint, with exposed GND pads (pins 25/26) requiring PCB soldering for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Independent input supplies per channel | Enables dual-rail operation (e.g., 12V + 5V inputs) or redundancy; each powers its own gate driver and INTVCC LDO. |
| SW1, SW2 | Switch node outputs (pins 13/14, 19/20) | Connects directly to inductor; requires low-inductance layout to minimize switching losses and EMI. |
| BOOST1, BOOST2 | Floating gate drive supply for top FETs | Boot capacitor must be placed close to pin; voltage swing = INTVCC to VINx + INTVCC. |
| FB1, FB2 | Feedback inputs (0.6V reference) | Resistor divider sets VOUT = 0.6V × (1 + R1/R2); high-impedance input (10nA bias) minimizes divider error. |
| ITH1, ITH2 | Error amplifier outputs / compensation nodes | Supports internal (tie to INTVCC) or external RC network for optimized transient response at ≥1MHz. |
| MODE/SYNC | Mode select & external clock sync input | Logic level selects Burst Mode (INTVCC), pulse skip (GND), or forced continuous (1.0V–INTVCC−1.2V); accepts external clock for synchronization. |
| ILIM | Current limit configuration | GND = full limit (5.0A typ), INTVCC = half limit (2.6A typ), floating = mixed (5.0A/2.6A per channel). |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert high-Z when VOUT within ±7.5%; 32-cycle delay on fault - enables safe sequencing in multi-rail systems. |
| RUN1, RUN2 | Channel enable inputs | Logic-high (>1.0V) activates channel; must not float - supports independent channel sequencing and standby control. |
| RT | Frequency programming resistor input | 100kΩ → 1MHz; ties to INTVCC for spread spectrum (2.25MHz ±12%) and disables sync capability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | <8μA with both channels active - enables >1-year battery life in always-on IoT sensors without shutdown circuitry. |
| Dual-channel 180° phase interleaving | Reduces input RMS ripple current by ~70% vs. parallel operation - cuts required input capacitance and EMI filter size. |
| Spread spectrum modulation | Enabled by tying RT to INTVCC - lowers peak radiated emissions by spreading energy across ±12% bandwidth around 2.25MHz. |
| Configurable light-load efficiency | Burst Mode® (800mA min peak current) or pulse-skip (200mA min) - balances IQ vs. output ripple based on system requirements. |
| Robust protection suite | Includes input overvoltage lockout (18.4V), undervoltage lockout (2.75V), thermal shutdown (TJMAX = 150°C), and reverse-current blocking. |
Applications
| Battery-Powered Portable Instruments | Point-of-Load Supplies for FPGA/CPU Cores |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring long runtime from single-cell Li-ion or 2S packs. IC Role / Device Role / Timing Role: Dual-output buck regulator generating 3.3V for MCU/peripherals and 1.2V for ADC/DAC analog rails. Use Value: <8μA no-load IQ extends battery life; 180° interleaving minimizes input cap size; ±1.0% VOUT accuracy maintains measurement integrity. |
Use Scenario: Embedded vision systems using Xilinx Zynq or Intel Cyclone SoCs with multiple voltage domains. IC Role / Device Role / Timing Role: Primary PoL converter delivering 1.0V @ 3.5A (core) and 1.8V @ 3.5A (I/O) from 12V intermediate bus. Use Value: Integrated 80mΩ/40mΩ FETs eliminate external components; programmable frequency avoids sensitive bands; PGOOD signals enable safe power sequencing. |
| Handheld Scanners & Barcode Readers | Industrial Sensor Nodes with Wireless Connectivity |
|
Use Scenario: Ruggedized handheld scanners operating from 3.7V Li-ion with intermittent high-current laser/decoder bursts. IC Role / Device Role / Timing Role: Dual-channel regulator powering 5V motor driver and 3.3V BLE/Wi-Fi module with independent RUN control. Use Value: Burst Mode® maintains μA-level sleep current between scans; fast transient response prevents brownout during laser activation. |
Use Scenario: Wireless vibration sensors deployed in factory environments with 4–20mA loop or energy harvesting input. IC Role / Device Role / Timing Role: High-efficiency dual rail generator for ultra-low-power MCU (1.8V) and RF transceiver (3.3V) from variable 5–15V source. Use Value: Wide 3.1–17V input accommodates harvested or loop-powered sources; spread spectrum reduces RF interference with wireless comms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4436-AEC1 from Monolithic Power Systems | Automotive-grade AEC-Q100, 3.5A/channel, 3.8–36V input, no spread spectrum, higher IQ (15μA) | Targeted at automotive infotainment and ADAS; lacks burst mode and dual-phase sync capability | Select when AEC-Q100 qualification and extended VIN range are mandatory; accept trade-off in light-load efficiency and EMI performance. |
| TPS544B25 from Texas Instruments | 4A/channel, 4.5–18V input, PMBus interface, integrated telemetry, 12μA IQ, no spread spectrum | Designed for server/datacom with digital control and monitoring; larger 5mm × 5.5mm QFN package | Choose when digital configuration, real-time telemetry, or higher current headroom is required; avoid if analog simplicity and lowest IQ are priorities. |
Compared with MPQ4436-AEC1 and TPS544B25, the LTC7124IUDD#TRPBF offers superior ultralow-IQ operation (<8μA), built-in spread spectrum for EMI reduction, and native 180° interleaving - making it optimal for space-constrained, battery-sensitive industrial and portable applications where analog control suffices.
Availability
LTC7124IUDD#TRPBF is available at Aetrix Electronics and suitable for battery-powered instruments, handheld scanners, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC7124IUDD#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) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency-critical applications.
The LTC7124IUDD#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC regulators engineered specifically for demanding portable, industrial, and instrumentation power systems where ultralow quiescent current and dual-output flexibility are essential.
FAQ
What is the maximum duty cycle supported by the LTC7124IUDD#TRPBF?
The LTC7124IUDD#TRPBF supports a maximum duty cycle of 99%, enforced by automatic BOOST-SW capacitor refresh in high-duty-cycle or dropout conditions. This ensures reliable top-FET gate drive even near VIN ≈ VOUT, preventing RDS(ON) rise and thermal runaway. Operation beyond 99% duty cycle is prohibited by internal timing logic to maintain regulation integrity.
How does the ILIM pin affect current limiting on each channel of the LTC7124IUDD#TRPBF?
The ILIM pin configures peak current limits per channel: tied to GND sets 5.0A typical for both channels; tied to INTVCC scales limits to 2.6A typical; left floating applies 5.0A to Channel 1 and 2.6A to Channel 2. These settings directly scale the minimum peak current in Burst Mode and pulse-skip modes, preserving light-load efficiency while adapting to asymmetric load requirements.
Can the LTC7124IUDD#TRPBF operate with only one input supply connected?
Yes - the LTC7124IUDD#TRPBF supports independent VIN1 and VIN2 supplies. If only VIN1 is powered, Channel 1 operates normally and powers the shared INTVCC LDO, which then supplies gate drive and bias for both channels. Channel 2 remains functional as long as VIN2 ≥ 3.1V; however, if VIN2 is unconnected or below UVLO, Channel 2 will not regulate regardless of RUN2 state.
What is the purpose of the exposed thermal pad (pins 25/26) on the LTC7124IUDD#TRPBF package?
The exposed thermal pad on the LTC7124IUDD#TRPBF is electrically and thermally connected to internal GND. It must be soldered to a solid PCB ground plane to achieve the specified θJA = 22°C/W and prevent junction temperature exceedance under full 3.5A/channel load. Omitting thermal pad connection degrades thermal performance by >40% and risks premature thermal shutdown.
Does the LTC7124IUDD#TRPBF support output voltage tracking during startup?
No - the LTC7124IUDD#TRPBF does not include dedicated tracking functionality. Each channel has independent soft-start (1100µs internal ramp) initiated upon its RUN pin assertion. To achieve coordinated startup, external circuitry (e.g., resistor divider from one FB to another RUN) is required. The device provides no internal voltage ramp synchronization between FB1 and FB2.
LTC7124IUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 16.8V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LTC7124IUDD#TRPBF FAQ
1.How can I place an order for LTC7124IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7124IUDD#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 LTC7124IUDD#TRPBF reliable?
The price and inventory of LTC7124IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7124IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7124IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7124IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7124IUDD#TRPBF?
LTC7124IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7124IUDD#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 LTC7124IUDD#TRPBF?
For technical support, including LTC7124IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7124IUDD#TRPBF requirements.
6.How does Aetrix verify that LTC7124IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7124IUDD#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 LTC7124IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7124IUDD#TRPBF?
All LTC7124IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7124IUDD#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 LTC7124IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7124IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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