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Analog Devices Inc. LTC3124IDHC#TRPBF
- Part No.:
- LTC3124IDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3124IDHC#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
LTC3124IDHC#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-up DC/DC converter with true output disconnect and inrush current limiting, delivering up to 15V output from inputs as low as 1.8V start-up or 500mV post-start. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase current limit, and Burst Mode® operation achieving 25µA quiescent current-enabling high-efficiency power conversion for RF power amplifiers, piezo actuators, and 12V analog rails from single-cell batteries.
For engineers reviewing the LTC3124IDHC#TRPBF datasheet, LTC3124IDHC#TRPBF pinout, LTC3124IDHC#TRPBF application, or LTC3124IDHC#TRPBF equivalent, key selection considerations include its dual-phase ripple reduction, true output disconnect during shutdown, 16-lead 3mm × 5mm DFN package thermal performance, and compatibility with external clock synchronization for noise-sensitive systems.
Technical Context
The LTC3124IDHC#TRPBF employs current-mode PWM control with adaptive slope compensation and dual-phase interleaving at 180° phase shift, enabling reduced output voltage ripple and lower peak inductor current versus single-phase boost topologies. Its internal N-channel MOSFET switches (0.13Ω RDS(ON)) and P-channel synchronous rectifiers support up to 95% efficiency across load ranges.
Operation includes programmable soft-start (10ms), integrated zero-current detection to disable synchronous rectifiers below ~50mA, and robust protection: output overvoltage (16.5V clamp), thermal shutdown (170°C), and short-circuit current limiting. The device maintains regulation down to 500mV input when VOUT ≥ 2.5V, leveraging VCC regulation from VIN or VOUT depending on operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.8V to 5.5V start-up; sustains regulation down to 500mV after start for VOUT ≥ 2.5V-maximizes energy extraction from depleted batteries. |
| VOUT Adjustment | 2.5V to 15V via resistor divider on FB pin-supports wide-range analog rails and high-voltage peripherals. |
| Switching Frequency | Programmable 100kHz–3MHz using RT resistor-enables optimization for efficiency (low fSW) or compact size (high fSW). |
| Peak Current Limit | 2.5A per phase (typical), 3.5A max-ensures stable operation under transient loads without external current sensing. |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown-critical for battery-powered devices requiring ultra-low standby power. |
| Efficiency | Up to 95% with synchronous rectification-reduces thermal stress and extends runtime in portable applications. |
| Output Disconnect | True disconnect of VOUT from VIN during shutdown-prevents backfeed and enables clean system power sequencing. |
Pinout & Package
The LTC3124IDHC#TRPBF is housed in a 16-lead, 3mm × 5mm × 0.75mm thermally enhanced plastic DFN package (DHC) with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWA, SWB (Pins 1, 3) | Phase A/B switch nodes | Drive external inductors; anti-ringing resistors activate when VOUT ≥ VIN + 2V to suppress EMI. |
| PGNDA, PGNDB, PGND (Pins 4, 2, 17) | Power ground terminals | Low-impedance return path for high-current switching loops; exposed pad must be soldered for thermal/electrical integrity. |
| VIN (Pin 5) | Main input supply | Powers IC directly if >3.5V; supports operation down to 500mV post-start via VCC regulation from VOUT. |
| PWM/SYNC (Pin 6) | Mode select & sync input | High = fixed-frequency PWM; Low = Burst Mode®; external clock = synchronization at 2× fSW. |
| FB (Pin 10) | Feedback input | Connects to resistor divider; regulates VOUT via 1.200V reference (±2% tolerance) across 2.5V–15V range. |
| SD (Pin 11) | Shutdown control | Logic-high (>1.6V) enables operation; logic-low (<0.25V) disables converter with <1µA IQ and true output disconnect. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved architecture | Halves peak inductor current and reduces output capacitor ripple current by >50% vs single-phase, enabling smaller magnetics and ceramics. |
| True output disconnect | Physically isolates VOUT from VIN during shutdown-eliminates reverse current and simplifies power domain isolation. |
| Programmable Burst Mode® | Reduces IQ to 25µA while maintaining regulation-extends battery life in intermittent-load applications like sensor wake-ups. |
| Internal soft-start (10ms) | Linearly ramps reference voltage to limit inrush current-removes need for external soft-start circuitry and stabilizes startup into large capacitive loads. |
| Robust fault protection | Integrated OVP (16.5V clamp), thermal shutdown (170°C), and short-circuit current limiting-enables reliable operation without external protection components. |
Applications
| RF Power Amplifier Bias Supply | Piezo Actuator Driver |
|---|---|
Use Scenario: Providing stable 12V bias to GaAs or GaN RF power amplifiers in portable transceivers where input is a single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter generating regulated high-voltage rail with low noise and fast transient response. Use Value: Interleaved ripple reduction minimizes AM modulation sidebands; true disconnect prevents amplifier leakage current from draining battery during sleep. | Use Scenario: Driving high-voltage piezoelectric elements (e.g., inkjet print heads, ultrasonic cleaners) requiring 5–15V pulses from low-voltage microcontrollers. IC Role / Device Role / Timing Role: Adjustable-output boost converter with programmable frequency and soft-start for controlled actuator voltage ramp-up. Use Value: 2.5A per-phase current limit ensures safe charge delivery; Burst Mode® maintains readiness with µA-level standby current. |
| Small DC Motor Driver | 12V Analog Rail Generator |
Use Scenario: Powering miniature brushed DC motors (e.g., in medical pumps or robotics) from 3.3V or 5V supplies where torque requires >6V. IC Role / Device Role / Timing Role: High-efficiency step-up regulator with inrush limiting and output disconnect to prevent motor back-EMF coupling into logic rails. Use Value: Internal zero-current detection disables synchronous rectifiers at light loads-improving efficiency during motor idle periods. | Use Scenario: Generating clean 12V analog supply for precision ADCs, DACs, or op-amps in battery-powered instrumentation using a 3.6V Li-ion source. IC Role / Device Role / Timing Role: Low-noise, synchronized boost converter with external clock option to avoid interference with sensitive analog signal chains. Use Value: Programmable 100kHz–3MHz fSW allows placement of switching noise outside critical analog bandwidths (e.g., audio or sensor bands). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467EDD#TRPBF | Single-phase, 2.5A switch current, fixed 1.3MHz fSW, no output disconnect, 20-pin DFN | Lacks dual-phase ripple reduction and true output disconnect; limited to ≤12V VOUT | Choose for cost-sensitive, space-constrained designs where 12V max and no disconnect are acceptable. |
| TPS61088RHLR | Single-phase, 8A switch current, 2.5V–12V VOUT, no programmable fSW, no output disconnect, 20-pin QFN | Higher current capability but no dual-phase benefits or true disconnect; fixed 500kHz/2MHz options only | Prefer for high-current, non-isolated boost needs where footprint and BOM count outweigh ripple/noise requirements. |
Compared with LT3467EDD#TRPBF and TPS61088RHLR, the LTC3124IDHC#TRPBF uniquely delivers dual-phase ripple suppression, true output disconnect, and full 2.5V–15V programmability-making it optimal for noise-sensitive, battery-critical, or high-voltage analog applications where those features are mandatory.
Availability
LTC3124IDHC#TRPBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, piezo actuator driving, and 12V analog rail generation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3124IDHC#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 product lines with rigorous reliability standards and automotive/industrial qualification.
The LTC3124 belongs to Linear's high-efficiency synchronous boost converter family, designed specifically for demanding portable and instrumentation applications requiring wide input/output voltage range, ultra-low quiescent current, and advanced protection features.
FAQ
What is the minimum input voltage required to start up the LTC3124IDHC#TRPBF?
The LTC3124IDHC#TRPBF requires a minimum input voltage of 1.6V (typical) to initiate startup, with guaranteed operation starting at 1.8V across temperature. Once started, it continues regulating output down to 500mV input for VOUT ≥ 2.5V-enabling deep discharge utilization of primary batteries or backup capacitors. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage".
Does the LTC3124IDHC#TRPBF provide true output disconnect during shutdown?
Yes, the LTC3124IDHC#TRPBF provides true output disconnect: when the SD pin is pulled low (<0.25V), internal switches physically isolate VOUT from VIN, preventing reverse current flow and backfeed. This is explicitly stated in the device description and verified in the Absolute Maximum Ratings and Pin Functions sections, where VOUTA/VOUTB are described as "disconnected from VIN when SD is low."
How is the switching frequency programmed on the LTC3124IDHC#TRPBF?
The LTC3124IDHC#TRPBF switching frequency is set via an external resistor (RT) from Pin 8 (RT) to SGND. The relationship is fSW ≈ 28 / RT (with fSW in MHz and RT in kΩ). For example, 28kΩ yields ~1MHz. The oscillator runs at 2× fSW, and synchronization requires applying 2× fSW to PWM/SYNC while setting RT ~25% lower than the standalone value.
What protection features does the LTC3124IDHC#TRPBF include?
The LTC3124IDHC#TRPBF integrates output overvoltage protection (clamped at 16.5V), thermal shutdown (activates at ~170°C junction temperature), short-circuit current limiting (2.5A per phase), and undervoltage lockout on VCC (<1.5V). These are documented in the Features list, Absolute Maximum Ratings, and Operation section-no external components are needed to implement these protections.
Can the LTC3124IDHC#TRPBF operate with an external clock synchronization signal?
Yes, the LTC3124IDHC#TRPBF supports external clock synchronization via the PWM/SYNC pin (Pin 6). Applying a pulse train at twice the desired switching frequency synchronizes the internal oscillator and disables Burst Mode®. An external RT resistor must be selected ~25% lower than the standalone value to ensure stable locking, as specified in the Oscillator section of the datasheet.
LTC3124IDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3124IDHC#TRPBF FAQ
1.How can I place an order for LTC3124IDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124IDHC#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 LTC3124IDHC#TRPBF reliable?
The price and inventory of LTC3124IDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124IDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3124IDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124IDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124IDHC#TRPBF?
LTC3124IDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124IDHC#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 LTC3124IDHC#TRPBF?
For technical support, including LTC3124IDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124IDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3124IDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3124IDHC#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 LTC3124IDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3124IDHC#TRPBF?
All LTC3124IDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124IDHC#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 LTC3124IDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3124IDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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