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Analog Devices Inc. LTC7124EUDD#PBF
- Part No.:
- LTC7124EUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7124EUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LTC7124EUDD#PBF from Analog Devices is a dual-channel, monolithic synchronous step-down regulator delivering up to 3.5A per channel from 3.1V–17V input, with programmable 500kHz–4MHz switching frequency, ±1.0% output voltage accuracy, and ultralow 8μA no-load quiescent current (dual-channel active). It powers battery-powered portable instruments and handheld scanners requiring high efficiency across wide load ranges.
For engineers reviewing the LTC7124EUDD#PBF datasheet, LTC7124EUDD#PBF pinout, LTC7124EUDD#PBF application, or LTC7124EUDD#PBF equivalent, key selection criteria include dual 3.5A output capability, 3mm × 5mm QFN-24 thermal performance, Burst Mode® vs forced continuous mode trade-offs, and integrated 80mΩ/40mΩ MOSFETs enabling up to 95% efficiency.
Technical Context
The LTC7124EUDD#PBF employs peak current mode control with independent error amplifiers per channel, supporting internal or external loop compensation via ITH1/ITH2 pins. Its 50ns minimum on-time enables regulation down to VOUT = VIN × f × 50ns, constraining low-VOUT operation at high frequencies.
Each channel features dedicated RUN, FB, PGOOD, BOOST, SW, and ITH pins, with 180° phase interleaving between channels. The ILIM pin configures full/half current limit per channel, while MODE/SYNC selects Burst Mode®, pulse skip, or forced continuous operation - with spread spectrum enabled when RT ties to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 17V - supports wide-input industrial and battery systems including 12V nominal rails. |
| Output Current per Channel | Up to 3.5A - enables dual high-current point-of-load regulation without external power stages. |
| Quiescent Current | <8μA (both channels active) - sustains >10-year battery life in always-on portable instrumentation. |
| Switching Frequency | 500kHz to 4MHz (RT-programmable) - allows EMI-sensitive designs to shift noise above AM band or optimize size/efficiency. |
| Output Voltage Accuracy | ±1.0% - ensures stable reference for precision analog circuitry and ADC/DAC biasing. |
| Integrated MOSFETs | 80mΩ top / 40mΩ bottom N-channel - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Package | 24-lead 3mm × 5mm QFN with exposed thermal pad - delivers θJA = 22°C/W for high-power density without heatsinks. |
Pinout & Package
Package: 24-lead (3mm × 5mm) plastic QFN with exposed GND pad (pins 25/26), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,2,7,8,25,26) | Power and signal ground reference | Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity; all GND pins share common internal node. |
| VIN1 / VIN2 (Pins 3,6) | Independent input supplies per channel | Enables dual-input systems (e.g., primary + backup rail); VIN1 powers INTVCC LDO. |
| FB1 / FB2 (Pins 24,9) | Feedback input to error amplifier | Senses output voltage via resistor divider; regulates VOUT = 0.6V × (1 + R1/R2) from 0.6V to 99% of respective VIN. |
| SW1 / SW2 (Pins 19,20 / 13,14) | Switch node connection | Drives external inductors; dual pins per switch reduce parasitic inductance and improve thermal spreading. |
| BOOST1 / BOOST2 (Pins 18,15) | Floating gate drive supply | Provides high-side NMOS gate voltage ≥ VIN + INTVCC; requires 0.1μF ceramic capacitor between BOOST and SW. |
| MODE/SYNC (Pin 17) | Operating mode select & sync input | Configures Burst Mode® (INTVCC), pulse skip (GND), or forced continuous (1.0V–INTVCC–1.2V); accepts external clock for ±25% sync range. |
| ILIM (Pin 4) | Peak current limit configuration | GND = full limit (5.0A typ), INTVCC = half limit (2.6A typ), floating = full on Ch1 / half on Ch2. |
| RT (Pin 5) | Frequency programming | Resistor to GND sets fOSC (500kHz–4MHz); tie to INTVCC to enable spread spectrum at 2.25MHz ±12%. |
| RUN1 / RUN2 (Pins 21,12) | Channel enable control | Logic-high (>1.0V) activates corresponding channel; prevents unintended startup during power sequencing. |
| PGOOD1 / PGOOD2 (Pins 22,11) | Open-drain power-good indicator | Asserts high-Z when VOUT within ±7.5%; 32-cycle delay on fault detection ensures noise immunity. |
| ITH1 / ITH2 (Pins 23,10) | Error amplifier output & compensation | Tie to INTVCC for internal compensation; connect RC network for optimized transient response at ≥1MHz. |
| INTVCC (Pin 16) | Internal 3.6V LDO output | Powers gate drivers and logic; requires ≥2.2μF low-ESR ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3.5A synchronous buck channels | Eliminates need for two discrete regulators; 180° phase interleaving reduces input/output ripple and EMI. |
| Ultralow quiescent current (8μA dual-channel) | Extends battery runtime in always-on portable devices without sacrificing full-load performance. |
| Spread spectrum modulation (RT-to-INTVCC) | Reduces peak radiated/conducted emissions by spreading energy over ±12% bandwidth around 2.25MHz. |
| Configurable light-load operation | Burst Mode® maximizes efficiency at microamp loads; forced continuous minimizes output ripple for noise-sensitive analog circuits. |
| Integrated 80mΩ/40mΩ MOSFETs | Delivers up to 95% efficiency at 3.5A without external power components, simplifying layout and reducing footprint. |
| ±1.0% output voltage accuracy | Meets tight tolerance requirements for FPGA core rails, precision sensor biasing, and ADC reference supplies. |
Applications
| Battery-Powered Portable Instruments | Handheld Scanners |
|---|---|
Use Scenario: Multichannel data acquisition units powered by Li-ion batteries (3.6V–16.8V) requiring stable 1.8V and 3.3V rails under variable load. IC Role / Device Role / Timing Role: Dual-output DC/DC converter providing regulated power to microcontroller, ADC, and communication interface with minimal standby drain. Use Value: 8μA dual-channel IQ extends operational time between charges; 17V max input accommodates fully charged 4S battery packs. |
Use Scenario: Barcode scanners with laser diode driver, image sensor, and Bluetooth radio needing isolated, low-noise 5V and 3.3V supplies. IC Role / Device Role / Timing Role: Primary power management IC generating synchronized, ripple-controlled outputs for mixed-signal subsystems. Use Value: Spread spectrum and forced continuous mode suppress switching noise near sensitive RF receivers; 3mm × 5mm QFN fits compact handheld form factor. |
| Point-of-Load Supplies | Industrial IoT Edge Nodes |
Use Scenario: Distributed power architecture in programmable logic controllers where local 1.2V FPGA core and 2.5V I/O rails are derived from 12V backplane. IC Role / Device Role / Timing Role: High-efficiency, thermally robust POL regulator replacing discrete buck controllers and external MOSFETs. Use Value: 95% efficiency at 3.5A reduces thermal stress; exposed pad and low θJA enable operation in sealed enclosures without airflow. |
Use Scenario: Wireless sensor nodes monitoring temperature, vibration, and pressure in factory environments with 9–36V DC input. IC Role / Device Role / Timing Role: Input-flexible dual-buck regulator powering ultra-low-power MCU and LoRaWAN transceiver with precise voltage sequencing. Use Value: Wide 3.1V–17V input range tolerates brownouts and surges; PGOOD1/PGOOD2 enable firmware-controlled power-up validation. |
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 |
|---|---|---|---|
| MPQ4436GL-AEC1-Z | Automotive-grade (AEC-Q100), 3.5A/channel, 3.3V–36V input, fixed 500kHz/2.2MHz options, no spread spectrum. | Designed for automotive infotainment and ADAS; lacks RT-programmability and Burst Mode® IQ optimization. | Select for automotive qualification needs; avoid if ultralow IQ or frequency flexibility is required. |
| TPS544B25RTER | 4A/channel, 4.5V–18V input, PMBus interface, 200kHz–1.5MHz, integrated telemetry, higher IQ (~15μA). | Targeted at server/datacom with digital power management; adds telemetry but increases complexity and cost. | Select when digital control, margining, or real-time telemetry are needed; not suitable for cost-sensitive portable designs. |
Compared with MPQ4436GL-AEC1-Z and TPS544B25RTER, the LTC7124EUDD#PBF uniquely balances ultralow 8μA quiescent current, RT-programmable frequency, spread spectrum EMI reduction, and compact 3mm × 5mm QFN - making it optimal for space-constrained, battery-sensitive industrial and portable applications where analog performance and thermal efficiency are critical.
Availability
LTC7124EUDD#PBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, handheld scanners, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC7124EUDD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7124EUDD#PBF belongs to Linear's Power by Linear™ family of high-efficiency DC/DC regulators, engineered specifically for demanding portable, battery-operated, and thermally constrained applications requiring ultralow IQ and wide input voltage range.
FAQ
What is the maximum input voltage rating for the LTC7124EUDD#PBF?
The LTC7124EUDD#PBF has an absolute maximum input voltage rating of 17V for VIN1 and VIN2, with overvoltage lockout triggering at 18.4V (rising) and resuming operation once voltage falls below 18V. This protects internal 80mΩ/40mΩ MOSFETs and ensures reliable operation in 12V systems with transient spikes.
How does the ILIM pin affect current limiting on each channel of the LTC7124EUDD#PBF?
The ILIM pin on the LTC7124EUDD#PBF configures peak current limits: tied to GND sets 5.0A typical per channel; tied to INTVCC halves both limits to 2.6A; left floating applies full limit to Channel 1 and half limit to Channel 2. This enables asymmetric load handling without external current sense resistors.
Can the LTC7124EUDD#PBF operate with only one channel enabled?
Yes - the LTC7124EUDD#PBF supports independent channel control via RUN1 and RUN2 pins. With only one channel active, quiescent current drops to <5.5μA, and the disabled channel draws negligible current, preserving battery life in partial-operation modes common in portable instrumentation.
What is the purpose of the MODE/SYNC pin on the LTC7124EUDD#PBF?
The MODE/SYNC pin on the LTC7124EUDD#PBF serves dual functions: selecting operating mode (Burst Mode®, pulse skip, or forced continuous) and accepting external clock signals for synchronization within ±25% of the RT-programmed frequency - enabling deterministic EMI reduction in noise-sensitive systems.
Does the LTC7124EUDD#PBF require external compensation components?
No - the LTC7124EUDD#PBF supports internal compensation by tying ITH1 or ITH2 to INTVCC, ensuring stability across 500kHz–4MHz. External RC networks are optional for enhanced transient response at ≥1MHz, but not mandatory for basic operation.
LTC7124EUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC7124EUDD#PBF FAQ
1.How can I place an order for LTC7124EUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7124EUDD#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 LTC7124EUDD#PBF reliable?
The price and inventory of LTC7124EUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7124EUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7124EUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7124EUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7124EUDD#PBF?
LTC7124EUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7124EUDD#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 LTC7124EUDD#PBF?
For technical support, including LTC7124EUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7124EUDD#PBF requirements.
6.How does Aetrix verify that LTC7124EUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7124EUDD#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 LTC7124EUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7124EUDD#PBF?
All LTC7124EUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7124EUDD#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 LTC7124EUDD#PBF part is unused and in its original packaging.
Return procedure for LTC7124EUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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