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Analog Devices Inc. LTC7124IUDD#PBF
- Part No.:
- LTC7124IUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7124IUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:420
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Product details
Overview
LTC7124IUDD#PBF from Analog Devices is a dual-channel, 3.5A per output, synchronous step-down DC/DC regulator operating from 3.1V to 17V input, delivering adjustable outputs from 0.6V to 99% of VIN with ±1.0% voltage accuracy and ultralow 8μA no-load quiescent current (both channels enabled). It integrates 80mΩ/40mΩ N-channel MOSFETs, supports programmable switching frequency (500kHz–4MHz), and features spread spectrum modulation for EMI reduction-used in battery-powered portable instruments and handheld scanners.
For engineers reviewing the LTC7124IUDD#PBF datasheet, LTC7124IUDD#PBF pinout, LTC7124IUDD#PBF application, or LTC7124IUDD#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 ILIM-configurable peak current limits across both channels.
Technical Context
The LTC7124IUDD#PBF employs a constant-frequency, peak-current-mode control architecture with independent error amplifiers and ITH pins enabling internal or external loop compensation. Each channel operates 180° out-of-phase to reduce input ripple, and features dedicated RUN, FB, PGOOD, BOOST, and SW terminals for full system-level control.
It integrates two complete buck regulators sharing only the INTVCC LDO and GND plane, with separate VIN1/VIN2 inputs, independent current limit configuration via ILIM, and synchronized or spread-spectrum clocking via RT/MODE/SYNC. The device enters ultralow-IQ sleep state in Burst Mode when load falls below minimum peak current thresholds (800mA full limit, 400mA half limit).
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 and Li-ion stacks. |
| Output Current per Channel | 3.5A - enables dual high-current point-of-load regulation without external power stages. |
| Quiescent Current | <8μA (both channels active, no load) - extends battery life in always-on portable instrumentation. |
| Switching Frequency | 500kHz to 4MHz (RT-programmable) - allows optimization of size (high-freq) vs efficiency (low-freq) and EMI filtering. |
| Output Voltage Accuracy | ±1.0% - ensures stable microcontroller core and analog sensor supply under line/load/temperature variation. |
| 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 in space-constrained PCBs. |
Pinout & Package
Package: 24-lead (3mm × 5mm) plastic QFN with exposed thermal pad (pins 25/26), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to solid ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,2,7,8,25,26) | Power and signal reference ground | Multiple low-inductance GND connections plus thermally enhanced exposed pad ensure stable return path and heat dissipation. |
| VIN1 / VIN2 (Pins 3,6) | Independent input supplies per channel | Enables dual-rail operation (e.g., 12V for one channel, 5V for another) or redundancy with separate input sources. |
| SW1 / SW2 (Pins 13,14,19,20) | Switch node outputs | High-current, high-dv/dt nodes requiring short, low-inductance routing to inductors and bootstrap capacitors. |
| BOOST1 / BOOST2 (Pins 15,18) | Floating gate drive supply for top FETs | Must be connected to bootstrap capacitors referenced to respective SW pins; enables high-side N-MOSFET drive. |
| FB1 / FB2 (Pins 24,9) | Feedback input to error amplifier | Resistor divider sets VOUT = 0.6V × (1 + R1/R2); 10nA input bias minimizes divider current error. |
| ITH1 / ITH2 (Pins 23,10) | Error amplifier output & compensation node | Connect to INTVCC for internal compensation or external RC network for optimized transient response at ≥1MHz. |
| RUN1 / RUN2 (Pins 21,12) | Channel enable control | Logic-high (>1.0V) enables corresponding channel; floating not allowed - requires pull-up/down for defined startup behavior. |
| PGOOD1 / PGOOD2 (Pins 22,11) | Open-drain power-good indicator | Asserts high-Z when VOUT is within ±7.5%; 32-cycle delay on fault detection prevents false triggering during transients. |
| ILIM (Pin 4) | Peak current limit select | GND = full limit (5.0A), INTVCC = half limit (2.6A), floating = full on Ch1/half on Ch2 - enables asymmetric current sharing. |
| MODE/SYNC (Pin 17) | Operating mode control & sync input | INTVCC = Burst Mode®, GND = pulse skip, 1.0V–(INTVCC–1.2V) = forced continuous; external clock sync supported ±25% around RT-set frequency. |
| RT (Pin 5) | Frequency programming | Resistor to GND sets fSW (100kΩ = ~1MHz); tie to INTVCC to enable spread spectrum at 2.25MHz ±12% and disable sync. |
| INTVCC (Pin 16) | Internal 3.6V LDO output | Bypass with ≥2.2μF low-ESR capacitor; powers internal circuitry and serves as reference for MODE/SYNC and ILIM logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3.5A synchronous buck channels | Eliminates need for two discrete regulators; reduces board area and component count while maintaining independent control. |
| Ultralow 8μA no-load IQ (dual channel) | Extends runtime in battery-backed applications such as handheld medical scanners and portable test equipment. |
| Configurable peak current limit via ILIM pin | Supports asymmetric current allocation (e.g., 3.5A + 1.75A) or matched dual 3.5A operation without external current sense resistors. |
| Spread spectrum modulation (RT = INTVCC) | Reduces peak radiated emissions by spreading energy across ±12% bandwidth centered at 2.25MHz - simplifies EMI compliance testing. |
| 180° phase interleaving between channels | Cuts input capacitor RMS current by ~70% versus parallel operation, lowering required CIN size and cost. |
| Internal/external loop compensation (ITH pins) | Enables stable operation across full 500kHz–4MHz range with internal network, or faster transient response with user-optimized external RC. |
Applications
| Battery-Powered Portable Instruments | Point-of-Load Supplies for FPGA/CPU Cores |
|---|---|
Use Scenario: Powering handheld oscilloscopes, multimeters, or gas analyzers powered by 2S–4S Li-ion batteries (7.2V–16.8V). IC Role / Device Role / Timing Role: Dual-output step-down regulator providing isolated 1.2V/3.3V rails for analog front-end and digital logic, with ultralow IQ preserving battery life during standby. Use Value: Enables >100-hour battery life in measurement devices by minimizing no-load loss and supporting deep-sleep modes without external enable sequencing. | Use Scenario: Delivering tightly regulated 1.0V and 1.8V supplies to FPGA I/O banks and core logic in edge AI inference modules. IC Role / Device Role / Timing Role: High-current, fast-transient POL regulator with 180° interleaving to suppress input ripple and maintain voltage stability during dynamic load steps. Use Value: Achieves <1% output deviation during 2A/µs load transients using external loop compensation, eliminating need for additional ceramic bulk capacitance. |
| Handheld Scanners & Barcode Readers | Industrial IoT Sensor Nodes |
Use Scenario: Supplying 5V motor driver and 3.3V MCU/CMOS image sensor in compact handheld barcode scanners with intermittent duty cycle. IC Role / Device Role / Timing Role: Dual-channel buck converter with independent RUN control enabling staggered startup and burst-mode operation during idle periods. Use Value: Reduces average system power by 65% during scan-idle intervals via automatic transition to 5.5μA single-channel IQ mode. | Use Scenario: Powering LoRaWAN or NB-IoT sensor nodes deployed in remote locations with primary 3.6V lithium-thionyl chloride batteries. IC Role / Device Role / Timing Role: Wide-VIN step-down regulator generating 3.3V and 1.8V from 2.0V–4.2V battery range, featuring UVLO hysteresis to prevent brownout oscillation. Use Value: Maintains regulation down to 3.1V VIN with 2.9V UVLO threshold and 300mV hysteresis, maximizing usable battery capacity before shutdown. |
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 |
|---|---|---|---|
| MP2482DS-LF-Z | Single 4A output, no dual-channel capability; fixed 500kHz fSW; no spread spectrum or ILIM pin. | Suitable only for single-rail applications; lacks independent channel control and low-IQ modes. | Select only if dual output is unnecessary and cost is prioritized over feature set and efficiency flexibility. |
| TPS544B25RTER | Single 4A output with PMBus interface; supports telemetry and dynamic voltage scaling; higher 12μA IQ. | Requires digital control infrastructure; unsuitable for analog-only or ultra-low-power battery systems. | Choose when system-level monitoring, margining, or adaptive voltage scaling is required over standalone analog regulation. |
Compared with MP2482DS-LF-Z and TPS544B25RTER, the LTC7124IUDD#PBF uniquely delivers true dual 3.5A outputs with independent enable, current limit, and feedback in a single 3mm × 5mm package-enabling compact, high-efficiency, low-quiescent designs where channel separation and minimal standby power are critical.
Availability
LTC7124IUDD#PBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, point-of-load FPGA supplies, and handheld scanner designs requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term production continuity.
Supply support for LTC7124IUDD#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 ICs, serving precision instrumentation, industrial automation, and communications markets.
The LTC7124 belongs to the Power by Linear™ family of high-efficiency, ultralow-IQ DC/DC regulators designed specifically for battery-critical and thermally constrained applications where dual-rail flexibility and EMI robustness are essential.
FAQ
What is the maximum output voltage range supported by the LTC7124IUDD#PBF?
The LTC7124IUDD#PBF supports an adjustable output voltage range from 0.6V up to 99% of the respective input voltage (VIN1 or VIN2), with guaranteed regulation and ±1.0% accuracy. For example, with VIN1 = 12V, VOUT1 can be set from 0.6V to 11.88V; the upper limit is enforced by internal boost-refresh logic to prevent dropout-related instability.
How does the ILIM pin affect current limiting on each channel of the LTC7124IUDD#PBF?
The ILIM pin on the LTC7124IUDD#PBF configures peak current limits for both channels: tied to GND sets 5.0A (typ) per channel; tied to INTVCC halves it to 2.6A (typ); left floating applies full limit to Channel 1 and half limit to Channel 2. This enables asymmetric current allocation without external sensing, directly affecting maximum deliverable load current and thermal design margins.
Can the LTC7124IUDD#PBF operate with different input voltages on VIN1 and VIN2?
Yes, the LTC7124IUDD#PBF supports independent input supplies: VIN1 powers Channel 1 and the INTVCC LDO, while VIN2 powers Channel 2 only. This allows operation with mismatched rails-for instance, 12V on VIN1 and 5V on VIN2-enabling flexible power architecture in multi-supply systems without cross-coupling or shared input constraints.
What are the thermal requirements for reliable operation of the LTC7124IUDD#PBF?
The LTC7124IUDD#PBF requires the exposed thermal pad (pins 25/26) to be soldered to a solid PCB ground plane to achieve its specified θJA = 22°C/W. Junction temperature must remain ≤125°C under worst-case load and ambient conditions; derating is required above 85°C ambient. Thermal performance is validated for –40°C to +125°C operating junction range.
Does the LTC7124IUDD#PBF support synchronization to an external clock source?
Yes, the LTC7124IUDD#PBF supports external clock synchronization via the MODE/SYNC pin, locking its RT-programmed frequency to an external signal within ±25% of the programmed value. However, this capability is disabled when RT is tied to INTVCC (enabling spread spectrum mode), in which case the device operates at 2.25MHz ±12% in forced continuous mode.
LTC7124IUDD#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)
LTC7124IUDD#PBF FAQ
1.How can I place an order for LTC7124IUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7124IUDD#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 LTC7124IUDD#PBF reliable?
The price and inventory of LTC7124IUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7124IUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7124IUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7124IUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7124IUDD#PBF?
LTC7124IUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7124IUDD#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 LTC7124IUDD#PBF?
For technical support, including LTC7124IUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7124IUDD#PBF requirements.
6.How does Aetrix verify that LTC7124IUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7124IUDD#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 LTC7124IUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7124IUDD#PBF?
All LTC7124IUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7124IUDD#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 LTC7124IUDD#PBF part is unused and in its original packaging.
Return procedure for LTC7124IUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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