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Analog Devices Inc. LTC3124HFE#PBF
- Part No.:
- LTC3124HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3124HFE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
LTC3124HFE#PBF 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 500mV after start-up. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase current limit, and operates across –40°C to +150°C junction temperature. It is used in RF power amplifier biasing, piezo actuator drive, and 12V analog rail generation from single-cell Li-ion or backup capacitors.
For engineers reviewing the LTC3124HFE#PBF datasheet, LTC3124HFE#PBF pinout, LTC3124HFE#PBF application, or LTC3124HFE#PBF equivalent, key selection criteria include its dual-phase ripple reduction, 15V adjustable output, <1µA shutdown current, Burst Mode® operation (25µA IQ), and thermally enhanced TSSOP package rated for 150°C operation.
Technical Context
The LTC3124HFE#PBF implements current-mode PWM control with adaptive slope compensation, enabling fast load transient response and stable regulation across wide input/output ranges. Its dual-phase architecture staggers SWA and SWB switching by 180°, reducing output capacitor RMS ripple current and doubling ripple frequency versus single-phase designs.
It integrates N-channel MOSFET switches (0.13Ω RDS(ON)) and P-channel synchronous rectifiers, supporting true output disconnect via internal switch isolation during shutdown. The VC error amplifier output drives external Type III compensation, while CAP pin establishes a –5.4V referenced gate drive rail for synchronous rectifier control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 5.5V - supports ultra-low-voltage start-up (≥1.8V) and sustained operation down to 500mV after start-up for energy harvesting or battery-depleted scenarios. |
| Output Voltage Range | 2.5V to 15V - adjustable via external resistor divider on FB pin; enables direct 12V rail generation from 3.3V or 5V sources. |
| Max Output Current | 1.5A at VIN = 5V, VOUT = 12V - dual-phase architecture delivers higher current than single-phase equivalents with lower thermal stress per phase. |
| Switching Frequency | 100kHz to 3MHz - programmable via RT resistor; allows optimization for efficiency (lower fSW) or compact size (higher fSW). |
| Quiescent Current | 25µA in Burst Mode - maintains high light-load efficiency without external bias rails; critical for always-on sensor or IoT nodes. |
| Shutdown Current | <1µA - ensures minimal battery drain during system sleep; verified under VOUT = 0V, SD = 0V conditions. |
| Junction Temp Range | –40°C to +150°C - H-grade qualification enables use in under-hood automotive, industrial motor drives, and high-ambient thermal environments. |
Pinout & Package
The LTC3124HFE#PBF is housed in a 16-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 17 = PGND). The package measures 5mm × 4.4mm × 1.2mm and requires soldering of the exposed pad to PCB ground plane for rated thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWA, SWB (Pins 1, 3) | Phase A/B switch node | Connects to respective boost inductors; internal anti-ringing resistors activate when VOUT ≥ VIN + 2V to suppress EMI during DCM. |
| PGNDA, PGNDB, PGND (Pins 4, 2, 17) | Power ground return | Must be tied directly to output capacitor ground and PCB ground plane; exposed pad (Pin 17) is primary thermal path and electrical ground. |
| VIN (Pin 5) | Main input supply | Powers device if >3.5V initially; sustains operation down to 0.5V; requires ≥10µF X5R/X7R ceramic bypass to PGND. |
| PWM/SYNC (Pin 6) | Mode select & sync input | High = fixed-frequency PWM; Low = Burst Mode; external clock = synchronization source (2× fSW); must not float. |
| VCC (Pin 7) | Internal LDO output | Regulated ~4.25V rail derived from VIN or VOUT; powers internal circuitry; UVLO triggers at ~1.5V. |
| RT (Pin 8) | Oscillator programming | Resistor to SGND sets fSW: fSW ≈ 28 / RT (MHz, RT in kΩ); e.g., 28kΩ → 1MHz per phase. |
| VC (Pin 9) | Error amplifier output | Drives external Type III compensation network (RC/CF) to stabilize control loop across load/line variations. |
| FB (Pin 10) | Feedback input | Monitors resistor divider (R1/R2) from VOUT; 1.200V nominal reference enables precise VOUT adjustment (2.5–15V). |
| SD (Pin 11) | Shutdown control | Logic-high (>1.6V) enables operation; logic-low (<0.25V) disables switching and reduces IQ to <1µA. |
| SGND (Pin 12) | Signal ground reference | Separate from PGND; provides low-noise return for FB, VC, RT; must have short, direct PCB trace to those pins. |
| VOUTA, VOUTB (Pins 13, 15) | Output voltage sense & rectifier source | Internally tied together; source of synchronous rectifiers; driver bias derived from VOUT; requires ≥10µF ceramic per phase to PGND. |
| NC (Pin 14) | No connect | Not bonded internally; may be connected to VOUT to enhance copper area for thermal relief or EMI reduction. |
| CAP (Pin 16) | Synchronous rectifier reference | Connected to 100nF capacitor to VOUT; generates ~5.4V below VOUT to drive P-channel rectifier gates. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronous boost | Reduces output ripple current by >50% vs single-phase, enabling smaller output capacitors and lower EMI filtering burden. |
| True output disconnect | Isolates VOUT from VIN during shutdown via internal switches - prevents backfeed and protects downstream circuitry. |
| Inrush current limiting | 10ms internal soft-start ramps VOUT reference linearly to 1.2V, eliminating input surge and simplifying input capacitor sizing. |
| Programmable Burst Mode® | Reduces quiescent current to 25µA while maintaining regulation - extends battery life in intermittent-load applications like wireless sensors. |
| Wide input voltage range | Operates from 0.5V after start-up - maximizes usable energy from depleted batteries, supercaps, or energy harvesters. |
| Robust protection suite | Includes overvoltage lockout (16.5V), thermal shutdown (170°C), short-circuit current limiting, and anti-ringing control for reliability in harsh environments. |
Applications
| RF Power Amplifier Biasing | Piezo Actuator Drive |
|---|---|
|
Use Scenario: Generating stable 12V–15V bias rails for GaAs or GaN RF power amplifiers in cellular base stations and mmWave transceivers. IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter providing low-noise, high-current output with tight regulation under dynamic RF load modulation. Use Value: Dual-phase ripple cancellation minimizes supply-induced AM-to-PM distortion; 150°C rating supports placement near hot PA stages. |
Use Scenario: Driving high-voltage piezoelectric actuators in precision positioning systems, inkjet printheads, and ultrasonic transducers. IC Role / Device Role / Timing Role: Adjustable-output step-up regulator delivering fast transient response and precise voltage control for capacitive loads. Use Value: Programmable 2.5V–15V output matches diverse piezo requirements; inrush limiting prevents mechanical shock during startup. |
| Small DC Motor Control | 12V Analog Rail from Battery |
|
Use Scenario: Powering miniature brushed DC motors in portable medical devices, lab automation, and robotics where space and thermal constraints are critical. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying regulated 5V–12V motor drive voltage from single-cell Li-ion (2.7–4.2V) or alkaline sources. Use Value: 95% peak efficiency and 25µA Burst Mode IQ extend runtime; dual-phase operation lowers inductor temperature rise during stall conditions. |
Use Scenario: Creating a clean, isolated 12V analog supply for op-amps, ADCs, and DACs from a shared 3.3V or 5V system rail or backup capacitor. IC Role / Device Role / Timing Role: Synchronous boost IC with true output disconnect ensuring no reverse current flow into the main system rail during fault or standby. Use Value: <1µA shutdown current preserves backup energy; output disconnect eliminates cross-talk between digital and sensitive analog domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467EFE#PBF | Single-phase, 1.3A max output, fixed 1.3MHz fSW, no output disconnect, 125°C max junction temp. | Lacks dual-phase ripple reduction and true output disconnect; suitable only for lower-current, non-isolated applications. | Select LTC3124HFE#PBF when dual-phase performance, output isolation, or 150°C operation is required. |
| TPS61088RHLR | Single-phase, 5A switch current, integrated compensation, 125°C max junction temp, no programmable fSW. | Higher peak current but no output disconnect or ultra-low IQ modes; uses different compensation scheme requiring layout rework. | Choose LTC3124HFE#PBF for applications demanding thermal robustness beyond 125°C or guaranteed <1µA shutdown current. |
Compared with LT3467EFE#PBF and TPS61088RHLR, the LTC3124HFE#PBF uniquely combines dual-phase ripple suppression, true output disconnect, 150°C operation, and sub-1µA shutdown - making it optimal for high-reliability, thermally constrained, or isolated-rail applications where those features are non-negotiable.
Availability
LTC3124HFE#PBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, piezo actuator drive, and 12V analog rail generation requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LTC3124HFE#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 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3124 belongs to Linear's high-performance power conversion family, designed specifically for demanding applications requiring wide input range, high efficiency, and robust thermal operation - especially where output isolation and ultra-low quiescent current are critical.
FAQ
What is the minimum input voltage required to start up the LTC3124HFE#PBF?
The LTC3124HFE#PBF requires a minimum of 1.6V (typical) to initiate start-up. Once running, it continues regulating output voltages ≥2.5V even as input drops to 500mV. This ultra-low operating voltage enables energy harvesting and deep battery discharge utilization. The LTC3124HFE#PBF achieves this via internal charge pump and adaptive biasing that remains functional below conventional LDO thresholds.
Does the LTC3124HFE#PBF support external clock synchronization, and what are the requirements?
Yes, the LTC3124HFE#PBF supports external synchronization via the PWM/SYNC pin. An external clock signal at exactly twice the desired switching frequency must be applied, with minimum pulse width of 100ns. Additionally, an RT resistor must be installed and set to ≈25% below the value needed for the target fSW to ensure reliable locking. The LTC3124HFE#PBF disables Burst Mode during synchronization to maintain deterministic timing.
How does the dual-phase architecture of the LTC3124HFE#PBF reduce output voltage ripple?
The LTC3124HFE#PBF staggers SWA and SWB switching by 180°, causing their inductor current ripples to partially cancel at the output node. This reduces RMS output capacitor ripple current by up to 70% compared to single-phase equivalents, allowing smaller ceramic capacitors and lower EMI filter complexity. The LTC3124HFE#PBF achieves this without increasing component count beyond two matched inductors and shared output capacitance.
What thermal derating applies to the LTC3124HFE#PBF at 150°C junction temperature?
The LTC3124HFE#PBF is fully specified and guaranteed over –40°C to +150°C junction temperature. However, continuous operation above 125°C accelerates parametric degradation and reduces long-term reliability. Derating guidelines recommend limiting average power dissipation so that steady-state TJ remains ≤125°C for >10-year lifetime; the LTC3124HFE#PBF includes thermal shutdown (170°C) as a safety guardrail, not a design target.
Can the LTC3124HFE#PBF safely drive capacitive loads like piezo actuators without oscillation?
Yes - the LTC3124HFE#PBF's Type III compensation network (VC-to-SGND) and adaptive slope compensation provide inherent stability into highly capacitive loads. Application notes confirm stable operation with >100nF effective capacitance and zero additional output resistance. The LTC3124HFE#PBF also includes zero-current detection to prevent reverse inductor current, further enhancing piezo drive fidelity and efficiency.
LTC3124HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3124HFE#PBF FAQ
1.How can I place an order for LTC3124HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124HFE#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 LTC3124HFE#PBF reliable?
The price and inventory of LTC3124HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3124HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124HFE#PBF?
LTC3124HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124HFE#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 LTC3124HFE#PBF?
For technical support, including LTC3124HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124HFE#PBF requirements.
6.How does Aetrix verify that LTC3124HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3124HFE#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 LTC3124HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3124HFE#PBF?
All LTC3124HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124HFE#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 LTC3124HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3124HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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