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Analog Devices Inc. LTC3124EFE#PBF
- Part No.:
- LTC3124EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3124EFE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:191
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Product details
Overview
LTC3124EFE#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 1.8V start-up and sustaining operation down to 500mV after start-up. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase peak current limit, and Burst Mode® operation achieving 25µA quiescent current - optimized for powering RF power amplifiers, piezo actuators, and 12V analog rails from single-cell Li-ion or backup capacitors.
For engineers reviewing the LTC3124EFE#PBF datasheet, LTC3124EFE#PBF pinout, LTC3124EFE#PBF application, or LTC3124EFE#PBF equivalent, key selection criteria include its dual-phase ripple reduction, output disconnect capability during shutdown, <1µA shutdown current, thermal shutdown at 170°C, and compatibility with 16-lead TSSOP packaging for thermally demanding industrial and portable systems.
Technical Context
The LTC3124EFE#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 operates with 180° phase shift, reducing output capacitor RMS ripple current by ~70% versus single-phase equivalents and doubling ripple frequency for easier filtering.
It integrates N-channel MOSFET switches (0.13Ω RDS(ON)) and P-channel synchronous rectifiers, supporting adjustable output voltage (2.5V–15V) via a resistor divider on FB, while internal soft-start (10ms) and zero-current detection (≈50mA threshold) enhance light-load efficiency and inrush control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V start-up; sustains operation down to 500mV after start-up - enables deep discharge battery utilization. |
| Output Voltage Range | 2.5V to 15V, adjustable via external resistor divider - supports 5V, 7.5V, 12V, and 15V analog rails. |
| Peak Current Limit | 2.5A per phase (typical), 3.5A max - sets safe inductor sizing and overcurrent protection threshold. |
| Switching Frequency | Programmable 100kHz–3MHz via RT resistor; synchronizable to external clock - balances efficiency vs. size/noise trade-offs. |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Efficiency | Up to 95% at full load (e.g., 5V→12V @ 1.5A) - minimizes thermal stress and power loss in compact layouts. |
| Thermal Protection | Thermal shutdown at 170°C (typical), with 7°C hysteresis - prevents permanent damage under sustained overload. |
Pinout & Package
The LTC3124EFE#PBF is housed in a 16-lead plastic TSSOP package (FE) with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for rated thermal performance (θJA = 40°C/W). Pin count, layout, and thermal design match the DFN variant but offer enhanced manufacturability for through-hole or mixed-technology assemblies.
| 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 paths for high di/dt currents; exposed pad must be soldered for thermal/electrical integrity. |
| VIN (Pin 5) | Main input supply | Primary power source; supplies internal circuitry down to ~3V, then auto-switches to VOUT if higher. |
| PWM/SYNC (Pin 6) | Mode control & sync input | Selects Burst Mode® (low), fixed-frequency PWM (high), or external clock sync (pulse train). |
| VCC (Pin 7) | Internal LDO output | Regulated ~4.25V rail derived from VIN or VOUT; UVLO at ~1.5V disables switching. |
| RT (Pin 8) | Oscillator programming | Resistor to SGND sets fSW ≈ 28 / RT(kΩ) MHz - enables precise frequency tuning. |
| FB (Pin 10) | Feedback input | Monitors resistor-divider output; 1.200V (typ) reference enables 2.5V–15V output adjustment. |
| SD (Pin 11) | Shutdown control | Logic-high (>1.6V) enables operation; logic-low (<0.25V) disables converter with <1µA IQ. |
| VOUTA/VOUTB (Pins 13, 15) | Output voltage sense & rectifier source | Must be tied together; provides gate drive bias for synchronous rectifiers and output disconnect path. |
| CAP (Pin 16) | Synchronous rectifier reference | 100nF cap to VOUT generates ~5.4V below VOUT - establishes elevated gate drive rail for P-MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronous boost | Reduces output ripple current by >65% and doubles ripple frequency - cuts required output capacitance and EMI filter size. |
| True output disconnect | Physically isolates VOUT from VIN during shutdown - prevents backfeed and enables clean system power sequencing. |
| Inrush current limiting | 10ms internal soft-start with linear reference ramp - eliminates input capacitor stress and avoids brownout during startup. |
| Ultra-low quiescent current | 25µA in Burst Mode®, <1µA in shutdown - preserves battery energy in standby or intermittent-use applications. |
| Wide input voltage support | Operates from 500mV after start-up - maximizes usable energy from depleted batteries or supercapacitors. |
| Robust fault protection | Integrated OVP (16.5V), thermal shutdown (170°C), and short-circuit current limiting - ensures reliability without external supervision. |
Applications
| RF Power Amplifier Supply | Piezo Actuator Driver |
|---|---|
Use Scenario: Generating stable 12V–15V bias for GaAs/GaN RF PAs in portable transceivers or IoT edge nodes. IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter providing regulated high-voltage rail with minimal output ripple and fast transient response. Use Value: Enables >95% efficiency at 1.5A load while suppressing switching noise that could degrade PA linearity or adjacent-band receiver sensitivity. |
Use Scenario: Driving high-voltage piezoelectric elements in precision positioning stages or ultrasonic cleaners. IC Role / Device Role / Timing Role: Adjustable-output boost regulator delivering 5V–15V with controlled inrush to prevent mechanical shock or element depolarization. Use Value: Soft-start and zero-current detection eliminate reverse-inductor current, improving actuator lifetime and positional accuracy. |
| 12V Analog Rail Generator | Small DC Motor / Thermal Printer Supply |
Use Scenario: Creating isolated 12V analog supply from 3.3V or 5V system rails or single-cell Li-ion (2.7V–4.2V). IC Role / Device Role / Timing Role: High-efficiency, low-noise boost converter with output disconnect to prevent cross-talk into sensitive ADCs or op-amp circuits. Use Value: Dual-phase operation reduces conducted EMI on the 12V rail, maintaining SNR in precision measurement subsystems. |
Use Scenario: Powering miniature DC motors or thermal print head arrays in handheld medical devices or point-of-sale terminals. IC Role / Device Role / Timing Role: Compact, thermally robust boost IC delivering burst-mode efficiency during idle periods and full-power delivery on demand. Use Value: <1µA shutdown current extends battery runtime between print cycles; thermal shutdown protects against motor stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3122EFE#PBF | Single-phase, 3A peak limit, 2.5V–15V output, same TSSOP package - lacks dual-phase ripple reduction and true output disconnect. | Suitable for lower-current (<1A), cost-sensitive designs where output ripple and backfeed isolation are less critical. | Choose LTC3122EFE#PBF only if dual-phase benefits are unnecessary and board space allows larger output caps to compensate for higher ripple. |
| TPS61088RHLR | Single-phase, 5A switch current, 2.7V–12V input, 4.5V–18V output - no output disconnect, higher IQ (40µA Burst), no sub-1V operation. | Better suited for USB-powered 5V→12V conversion with higher peak loads, but incompatible with ultra-low-VIN or strict backfeed isolation requirements. | Select TPS61088RHLR when input is ≥2.7V and output disconnect is not required; avoid for battery-depleted or safety-critical isolation use cases. |
Compared with LTC3122EFE#PBF and TPS61088RHLR, the LTC3124EFE#PBF uniquely delivers dual-phase ripple suppression, true output disconnect, and 500mV operational capability - making it the only choice for high-fidelity analog rails, piezo drivers, and deeply discharged battery systems demanding both efficiency and functional safety.
Availability
LTC3124EFE#PBF 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-lifecycle assurance, and consistent thermal performance across industrial temperature ranges.
Supply support for LTC3124EFE#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 its legacy of high-performance power management ICs with rigorous characterization and long-term product support.
The LTC3124 product line was designed specifically for high-efficiency, low-noise, multi-phase boost conversion in space-constrained and thermally demanding applications - targeting portable instrumentation, medical devices, and industrial sensing systems.
FAQ
What is the minimum input voltage required to start up the LTC3124EFE#PBF?
The LTC3124EFE#PBF requires a minimum input voltage of 1.6V (typical) to initiate start-up, with guaranteed operation from 1.8V across temperature. Once started, it continues regulating output voltages ≥2.5V even as VIN drops to 500mV - a key advantage for maximizing energy extraction from aging or deeply discharged batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range".
Does the LTC3124EFE#PBF provide true output disconnect, and how is it implemented?
Yes, the LTC3124EFE#PBF provides true output disconnect: when the SD pin is pulled low (<0.25V), internal P-channel MOSFET synchronous rectifiers are fully turned off, physically breaking the conduction path between VIN and VOUT. This prevents backfeed, enables clean power sequencing, and eliminates leakage paths - verified in the Functional Block Diagram, PIN FUNCTIONS section (VOUTA/VOUTB description), and Typical Application schematic where VOUT is isolated during shutdown.
How does the dual-phase architecture of the LTC3124EFE#PBF reduce output voltage ripple?
The LTC3124EFE#PBF uses two 180°-phase-shifted boost channels, causing their inductor current ripples to cancel at the output node. This reduces RMS output capacitor ripple current by ~70% and doubles the fundamental ripple frequency - enabling smaller ceramic capacitors and simpler EMI filtering. The effect is quantified in the OPERATION section (Figure 1), where dual-phase ripple amplitude is shown substantially lower than single-phase at identical 1.5A load and 50% duty cycle.
What is the role of the CAP pin on the LTC3124EFE#PBF, and what capacitor value is recommended?
The CAP pin on the LTC3124EFE#PBF serves as the low-side reference for synchronous rectifier gate drives, generating an elevated ~5.4V-below-VOUT rail to fully enhance the internal P-channel MOSFETs. A 100nF low-ESR ceramic capacitor (X5R/X7R) must be placed directly between CAP and VOUT - as specified in the PIN FUNCTIONS section and Typical Application schematic (3124 TA01a). Deviation risks insufficient gate drive and reduced efficiency.
Can the LTC3124EFE#PBF be synchronized to an external clock, and what are the timing requirements?
Yes, the LTC3124EFE#PBF can be synchronized to an external clock applied to the PWM/SYNC pin. The external signal must be a pulse train at twice the desired switching frequency (e.g., 2.6MHz for 1.3MHz fSW), with minimum pulse width of 100ns. An RT resistor must also be installed - set to ≥1.25× the value used for free-running operation - to ensure stable synchronization, as detailed in the PIN FUNCTIONS and OPERATION sections.
LTC3124EFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3124EFE#PBF FAQ
1.How can I place an order for LTC3124EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124EFE#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 LTC3124EFE#PBF reliable?
The price and inventory of LTC3124EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3124EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124EFE#PBF?
LTC3124EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124EFE#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 LTC3124EFE#PBF?
For technical support, including LTC3124EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124EFE#PBF requirements.
6.How does Aetrix verify that LTC3124EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3124EFE#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 LTC3124EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3124EFE#PBF?
All LTC3124EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124EFE#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 LTC3124EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3124EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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