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Analog Devices Inc. LTC3124EDHC#TRPBF
- Part No.:
- LTC3124EDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3124EDHC#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:621
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Product details
Overview
LTC3124EDHC#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 peak current limit, and 95% peak efficiency-enabling compact, high-efficiency 12V analog rail generation from single-cell Li-ion or backup capacitors.
For engineers reviewing the LTC3124EDHC#TRPBF datasheet, LTC3124EDHC#TRPBF pinout, LTC3124EDHC#TRPBF application, or LTC3124EDHC#TRPBF equivalent, key selection criteria include dual-phase ripple reduction, sub-1µA shutdown current, Burst Mode® operation at 25µA IQ, output disconnect capability, and thermal-enhanced 3mm × 5mm DFN packaging for high-power-density boost designs.
Technical Context
The LTC3124EDHC#TRPBF implements current-mode PWM control with adaptive slope compensation across two interleaved 180°-phased power stages, enabling precise line/load regulation and fast transient response. Its dual-phase architecture reduces output capacitor RMS ripple current by ~70% versus single-phase equivalents while doubling ripple frequency for easier filtering.
It integrates N-channel MOSFET switches (0.13Ω RDS(ON)) and P-channel synchronous rectifiers, supports external frequency programming via RT resistor or synchronization to external clock (0.2–6MHz), and includes zero-current detection to disable rectifiers below ~50mA load-minimizing reverse conduction losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 1.8V to 5.5V start-up; sustains regulation down to 500mV after start (enables deep battery discharge utilization) |
| Output voltage range | 2.5V to 15V adjustable via FB divider (supports 5V→12V, 3.3V→15V, and piezo actuator bias rails) |
| Max output current | 1.5A at VIN=5V/VOUT=12V (dual-phase delivers higher sustained current than single-phase ICs of similar size) |
| Switching frequency | Programmable 100kHz–3MHz (RT resistor or external SYNC; 1MHz typical for optimal efficiency/size trade-off) |
| Quiescent current | 25µA in Burst Mode®, <1µA in shutdown (extends battery life in always-on sensor nodes) |
| Peak current limit | 2.5A per phase (3.5A typ), independent of input/output voltage (ensures consistent overcurrent protection) |
| Efficiency | Up to 95% at full load (synchronous rectification eliminates external Schottky losses) |
| Package | 16-lead 3mm × 5mm × 0.75mm DFN with exposed PGND pad (θJA = 43°C/W; requires PCB thermal pad for rated performance) |
Pinout & Package
Package: 16-lead plastic DFN (DHC), 3mm × 5mm × 0.75mm, thermally enhanced with exposed PGND pad (Pin 17) requiring solder connection 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 node outputs | Drive external inductors; require short/wide PCB traces to minimize EMI and ringing; anti-ringing resistors activate when VOUT ≥ VIN + 2V |
| PGNDA, PGNDB, PGND (Pins 2, 4, 17) | Power ground return paths | Must connect directly to output capacitors and PCB ground plane; exposed pad (Pin 17) is primary thermal path and mandatory for spec compliance |
| VIN (Pin 5) | Main input supply input | Supplies IC when >3.5V; drops to VOUT-derived VCC below ~3V; requires ≥10µF low-ESR ceramic bypass to PGND |
| PWM/SYNC (Pin 6) | Mode select & oscillator sync input | High = fixed-frequency PWM; Low = Burst Mode®; external clock = sync source (must be 2× fSW; RT must be set 25% lower) |
| VCC (Pin 7) | Internally regulated bias rail | ~4.25V LDO output; powers internal circuitry; UVLO at ~1.5V disables switching until recovery |
| RT (Pin 8) | Oscillator frequency programming | Resistor to SGND sets fSW ≈ 28/RT (MHz); e.g., 28kΩ → 1MHz; enables precise noise/efficiency optimization |
| VC (Pin 9) | Error amplifier output | Connect Type III compensation network (RC/CF) to SGND; determines loop stability and transient response |
| FB (Pin 10) | Feedback input | Monitors resistor divider from VOUT; 1.200V reference enables 2.5–15V output programming (VOUT = 1.2V × (1 + R1/R2)) |
| SD (Pin 11) | Shutdown control | Logic-high (>1.6V) enables operation; logic-low (<0.25V) disables converter and reduces IQ to <1µA |
| SGND (Pin 12) | Signal ground reference | Separate from PGND; connects to compensation and feedback components to avoid noise coupling |
| VOUTA, VOUTB (Pins 13, 15) | Output voltage sense & rectifier source | Must be tied together; provide gate drive bias for synchronous rectifiers; connect ≥10µF ceramic per phase to PGND |
| NC (Pin 14) | No connect | Not internally connected; may be tied to VOUT for enhanced copper area but carries no functional role |
| CAP (Pin 16) | Synchronous rectifier gate drive reference | Connect 100nF capacitor to VOUT to generate ~5.4V-below-VOUT rail for P-MOSFET gate drive |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved architecture | Reduces output ripple current by ~70% and doubles ripple frequency vs. single-phase-enabling smaller output capacitors and lower EMI filtering cost |
| True output disconnect | Physically isolates VOUT from VIN during shutdown (no leakage path), preventing backfeed into input source-critical for battery-powered systems |
| Inrush current limiting | Internal 10ms soft-start ramps reference voltage linearly to 1.2V, controlling output rise time regardless of output capacitance or load |
| Burst Mode® operation | Reduces quiescent current to 25µA at light loads while maintaining regulation-extending runtime in intermittent-sensing applications |
| Low-voltage start-up & operation | Starts from 1.8V and sustains regulation down to 500mV input (for VOUT ≥ 2.5V), maximizing energy extraction from depleted batteries or supercaps |
| Robust protection suite | Includes short-circuit, thermal shutdown (170°C trip), output overvoltage (16.5V clamp), and anti-ringing circuitry-reducing need for external fault management |
Applications
| RF Power Amplifier Bias | Piezo Actuator Driver |
|---|---|
Use Scenario: Generating stable 12V–15V bias for GaAs/GaN RF PA stages in portable radios or IoT transceivers powered by 3.3V or single-cell Li-ion. IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter providing low-noise, high-current output with fast transient response to PA envelope modulation. Use Value: Interleaved ripple reduction minimizes supply-induced AM-to-PM distortion; output disconnect prevents PA bias collapse during sleep mode. | Use Scenario: Driving high-voltage piezoelectric actuators (e.g., inkjet printheads, micro-positioners) requiring 50–200V ramped waveforms from low-voltage microcontrollers. IC Role / Device Role / Timing Role: High-efficiency, programmable boost stage supplying intermediate rail (e.g., 12V) to external charge-pump or transformer driver circuits. Use Value: 2.5A per-phase current limit and 15V max output enable robust pre-charge of piezo capacitance; Burst Mode® extends standby time between actuations. |
| Thermal Printer Head Supply | 12V Analog Rail Generator |
Use Scenario: Powering resistive thermal print head arrays (e.g., 12V @ 1.5A) from 5V USB or 3.7V Li-ion sources in portable label printers. IC Role / Device Role / Timing Role: Compact, high-current boost converter delivering regulated 12V with minimal board space and thermal footprint. Use Value: Dual-phase operation allows use of smaller 4.7µH inductors and 10µF ceramic caps per phase-reducing solution size by >30% vs. single-phase alternatives. | Use Scenario: Creating clean 12V analog supply for op-amps, ADCs, or sensors from noisy 5V system rails or backup capacitors in industrial controllers. IC Role / Device Role / Timing Role: Synchronous boost regulator with output disconnect and low 25µA Burst Mode® IQ for always-on monitoring circuits. Use Value: <1µA shutdown current preserves backup capacitor energy for >100 hours; programmable fSW enables noise-sensitive placement near precision analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3122EDHC#TRPBF | Single-phase, 2A max output, 1.2MHz fixed fSW, no SYNC pin, 1.2V FB reference | Lacks dual-phase ripple reduction and external frequency sync; lower max output current (2A vs. 3A combined) | Select when board space is extremely constrained and 1.5A output suffices; not suitable for ultra-low-noise or high-ripple-sensitive loads. |
| TPS61088RHLR | Single-phase, 4.5A switch current, 500kHz–2.2MHz programmable fSW, no output disconnect, 0.6V FB reference | Higher peak current but no true output disconnect; lacks Burst Mode® (IQ = 200µA active, 1.2µA shutdown) | Prefer for higher-current, cost-sensitive applications where backfeed prevention is not required and higher quiescent current is acceptable. |
Compared with LTC3124EDHC#TRPBF, LTC3122EDHC#TRPBF offers smaller footprint but sacrifices ripple performance and flexibility, while TPS61088RHLR provides higher current headroom but lacks critical low-IQ and output isolation features needed for battery longevity and system-level safety.
Availability
LTC3124EDHC#TRPBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, piezo actuator driving, thermal printer head powering, and 12V analog rail generation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3124EDHC#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3124EDHC#TRPBF belongs to Linear's high-efficiency, low-voltage boost converter product line-designed specifically for space-constrained, battery-powered systems needing wide input range, true output disconnect, and ultra-low quiescent current.
FAQ
What is the minimum input voltage required to start up the LTC3124EDHC#TRPBF?
The LTC3124EDHC#TRPBF starts up from a minimum input voltage of 1.8V. Once started, it continues regulating output voltages ≥2.5V even as input drops to 500mV-enabling full energy extraction from deeply discharged batteries or backup capacitors. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" (1.8V typ) and "Input Voltage Range" (0.5V min post-start).
Does the LTC3124EDHC#TRPBF support external synchronization of its switching frequency?
Yes, the LTC3124EDHC#TRPBF supports external synchronization via the PWM/SYNC pin (Pin 6). Applying a pulse train at twice the desired switching frequency synchronizes the internal oscillator. An external RT resistor must be set to ~25% lower value than the standalone setting to ensure stable lock-e.g., for 1.2MHz fSW, use RT ≈ 23kΩ instead of 28kΩ. This feature is documented in the "Oscillator" section and Typical Performance Characteristic Figure G27.
How does the LTC3124EDHC#TRPBF achieve true output disconnect?
The LTC3124EDHC#TRPBF achieves true output disconnect by fully disabling both synchronous rectifiers and high-side switches when the SD pin is pulled low. This physically breaks the conductive path between VIN and VOUT, reducing leakage to <1µA-verified in the "Quiescent Current, Shutdown" specification (0.2–1µA). Unlike basic enable/disable ICs, this prevents backfeed into input sources, which is essential for battery-backed or multi-rail systems.
What package type and thermal requirements apply to the LTC3124EDHC#TRPBF?
The LTC3124EDHC#TRPBF uses a 16-lead 3mm × 5mm × 0.75mm plastic DFN (DHC package) with an exposed PGND pad (Pin 17). For rated thermal performance (θJA = 43°C/W), this pad must be soldered to a dedicated PCB ground plane with ≥4 thermal vias. Failure to do so increases junction temperature significantly-documented in the Absolute Maximum Ratings note 5 and Package Description table.
Can the LTC3124EDHC#TRPBF operate with only one inductor, or is dual-phase mandatory?
Dual-phase operation is mandatory for the LTC3124EDHC#TRPBF. It integrates two complete, interleaved power stages (SWA and SWB pins) with shared control logic and cannot be configured for single-inductor use. The block diagram, pin functions, and all application circuits (e.g., TA01a) require two matched inductors. Attempting single-phase operation will result in improper regulation, excessive ripple, and potential instability due to missing current sensing and phase timing.
LTC3124EDHC#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)
LTC3124EDHC#TRPBF FAQ
1.How can I place an order for LTC3124EDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124EDHC#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 LTC3124EDHC#TRPBF reliable?
The price and inventory of LTC3124EDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124EDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3124EDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124EDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124EDHC#TRPBF?
LTC3124EDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124EDHC#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 LTC3124EDHC#TRPBF?
For technical support, including LTC3124EDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124EDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3124EDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3124EDHC#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 LTC3124EDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3124EDHC#TRPBF?
All LTC3124EDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124EDHC#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 LTC3124EDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3124EDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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