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Analog Devices Inc. LTC3124EFE#TRPBF
- Part No.:
- LTC3124EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3124EFE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:930
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Product details
Overview
LTC3124EFE#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 and sustaining operation down to 500mV after startup. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase peak current limit, and Burst Mode® operation achieving 25µA quiescent current - ideal for powering RF power amplifiers and piezo actuators from single-cell Li-ion or backup capacitors.
For engineers reviewing the LTC3124EFE#TRPBF datasheet, LTC3124EFE#TRPBF pinout, LTC3124EFE#TRPBF application, or LTC3124EFE#TRPBF equivalent, key selection considerations include its dual-phase ripple reduction, true output disconnect during shutdown, 16-lead TSSOP thermal performance (θJA = 40°C/W), and compatibility with 2.5V–15V adjustable output configurations requiring high light-load efficiency and low-noise fixed-frequency operation.
Technical Context
The LTC3124EFE#TRPBF implements current-mode PWM control with adaptive slope compensation across two interleaved 180°-phased boost stages, enabling precise line/load regulation and fast transient response. Its architecture integrates lossless peak-current sensing per phase, zero-current detection for synchronous rectifier turn-off, and anti-ringing circuitry activated when VOUT ≥ VIN + 2V to suppress SW-node EMI.
Operation supports three modes: fixed-frequency PWM (via PWM/SYNC high), external clock synchronization (with RT resistor biasing 25% below sync frequency), and Burst Mode® (via PWM/SYNC low), where the error amplifier and gate drivers cycle on/off to maintain 25µA IQ. The internal 1.200V ±2.0% feedback reference and 10ms linear soft-start ensure controlled startup into large capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V for startup; sustains regulation down to 500mV after startup - enables deep battery discharge utilization. |
| Output Voltage Range | 2.5V to 15V, adjustable via external resistor divider - supports 12V analog rails and RF PA biasing. |
| Peak Current Limit | 2.5A per phase (typical), 3.5A max - sets inductor sizing and short-circuit current capability. |
| 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 sensor nodes. |
| Efficiency | Up to 95% at full load (e.g., 5V→12V @ 1.5A) - minimizes thermal stress in compact layouts. |
| Thermal Performance | TJMAX = 125°C, θJA = 40°C/W (TSSOP package) - defines maximum ambient temperature under given PCB copper area. |
Pinout & Package
The LTC3124EFE#TRPBF 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 outputs | Drive external inductors; require short/wide PCB traces to minimize EMI and ringing; anti-ringing resistors engage when VOUT ≥ VIN + 2V. |
| PGNDA, PGNDB, PGND (Pins 4, 2, 17) | Power ground return paths | Must connect directly to output capacitor ground and PCB ground plane; exposed pad (Pin 17) is mandatory for thermal/electrical performance. |
| VIN (Pin 5) | Main input supply input | Accepts 1.8V–5.5V; powers internal circuitry when >3.5V, otherwise VOUT assists; requires ≥10µF low-ESR ceramic bypass to PGND. |
| PWM/SYNC (Pin 6) | Mode control and clock sync input | High = fixed-frequency PWM; Low = Burst Mode®; external clock = synchronization source (pulse width ≥100ns). |
| VCC (Pin 7) | Internally regulated bias rail | ~4.25V LDO output; powered by VIN or VOUT; requires ≥4.7µF ceramic capacitor to SGND; UVLO at ~1.5V disables switching. |
| RT (Pin 8) | Oscillator frequency programming | Resistor to SGND sets fSW ≈ 28 / RT(kΩ) MHz; for sync, RT must be ≥1.25× value for target fSW. |
| FB (Pin 10) | Feedback voltage sense input | Connects to resistor divider from VOUT; 1.200V ±2.0% reference enables 2.5V–15V output adjustment. |
| SD (Pin 11) | Logic-controlled shutdown | Low (<0.25V) disables converter and reduces IQ to <1µA; high (>1.6V) enables operation; not floating. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaving | Reduces output capacitor RMS ripple current by ~70% vs. single-phase, enabling smaller 10µF ceramic caps per phase instead of bulk electrolytics. |
| True output disconnect | VOUTA/VOUTB fully isolated from VIN during shutdown - prevents backfeed into input source in battery-powered systems. |
| Inrush current limiting | 10ms internal soft-start ramps VOUT reference linearly to 1.2V, limiting startup surge regardless of output capacitance size. |
| Low-voltage operation | Starts from 1.8V and sustains regulation down to 500mV input - extracts maximum energy from depleted batteries or supercaps. |
| Robust protection suite | Includes overvoltage lockout (16.5V), thermal shutdown (170°C), and short-circuit foldback - ensures reliability in unattended industrial deployments. |
Applications
| RF Power Amplifier Biasing | Piezo Actuator Drive |
|---|---|
Use Scenario: Providing stable 12V bias to GaAs or GaN RF PAs in portable transceivers operating from 3.6V Li-ion cells. IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter generating regulated 12V output with minimal output ripple and fast load transient response. Use Value: Enables high-efficiency RF output power while maintaining spectral purity via low-noise, synchronized switching and reduced EMI from interleaved phases. |
Use Scenario: Driving high-voltage piezoelectric elements (e.g., inkjet printheads, ultrasonic cleaners) requiring 50–150V pulses from low-voltage logic supplies. IC Role / Device Role / Timing Role: Adjustable-output boost controller supplying precise 12V–15V intermediate rail to external charge-pump or transformer-based HV generator. Use Value: Delivers tightly regulated, low-ripple intermediate voltage with true output disconnect - prevents unintended actuator movement during standby. |
| Small DC Motor Control | 12V Analog Rail Generation |
Use Scenario: Powering miniature brushed DC motors (e.g., in medical pumps or robotics) from 3.3V or 5V system rails. IC Role / Device Role / Timing Role: High-current step-up regulator delivering up to 1.5A at 12V with inrush limiting and robust short-circuit protection. Use Value: Eliminates need for discrete MOSFET drivers and external current sensing - simplifies motor drive BOM while ensuring stall-safe operation. |
Use Scenario: Generating clean 12V analog supply for precision ADCs, DACs, or op-amps in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-noise, programmable-frequency boost converter with selectable Burst Mode® for ultra-low idle power. Use Value: Achieves <25µA quiescent current in sleep mode while maintaining fast wake-up and low output ripple (<20mVPP) in active mode. |
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, 60µA IQ in shutdown | Suitable for lower-current, cost-sensitive designs where dual-phase ripple reduction and true disconnect are unnecessary | Select if output current ≤1.3A and board space is constrained; avoid when >1.5A or output isolation during shutdown is required. |
| TPS61088RHLR | Single-phase, 4.5A switch current, 2.7V–12V input, no programmable fSW, no output disconnect, 20µA IQ in shutdown | Better suited for high-current, wide-input applications without strict low-noise or true-disconnect requirements | Prefer for 3V–12V input systems needing >2A output; reject when dual-phase EMI suppression or sub-500mV hold-up is critical. |
Compared with LT3467EFE#PBF and TPS61088RHLR, the LTC3124EFE#TRPBF uniquely delivers dual-phase ripple cancellation, true output disconnect, and 500mV minimum operating voltage - making it the only option among the three capable of sustaining 12V output from deeply discharged single-cell batteries while meeting stringent EMI and safety isolation requirements.
Availability
LTC3124EFE#TRPBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, piezo actuator drive, and 12V analog rail generation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical OEM programs.
Supply support for LTC3124EFE#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, emphasizing precision, efficiency, and ruggedness for demanding analog and mixed-signal applications.
The LTC3124EFE#TRPBF belongs to Linear's high-efficiency synchronous boost converter product line, designed specifically for battery-powered systems requiring wide input range, true output isolation, and ultra-low quiescent current - targeting RF, medical, and portable instrumentation markets.
FAQ
What is the minimum input voltage required to start up the LTC3124EFE#TRPBF?
The LTC3124EFE#TRPBF starts up from a minimum input voltage of 1.8V. Once started and regulating, it continues operation down to 500mV input voltage for output voltages ≥2.5V - a key feature enabling extended runtime from depleted batteries or backup capacitors. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range".
Does the LTC3124EFE#TRPBF provide true output disconnect during shutdown?
Yes, the LTC3124EFE#TRPBF provides true output disconnect: when the SD pin is pulled low (<0.25V), both VOUTA and VOUTB terminals are internally disconnected from VIN, preventing backfeed into the input source. This is explicitly stated in the device description and verified in the Pin Functions section, where VOUTA/VOUTB are described as "disconnected from VIN when SD is low."
How is the switching frequency programmed on the LTC3124EFE#TRPBF?
The switching frequency of the LTC3124EFE#TRPBF is programmed using an external resistor (RT) connected between Pin 8 (RT) and SGND. The relationship is fSW ≈ 28 / RT(kΩ) MHz. For example, a 28kΩ resistor sets fSW ≈ 1MHz. Table 1 in the datasheet lists standard RT values for frequencies from 100kHz to 3MHz, and the oscillator can also be synchronized to an external clock applied to the PWM/SYNC pin.
What package type does the LTC3124EFE#TRPBF use, and what are its thermal characteristics?
The LTC3124EFE#TRPBF uses a 16-lead plastic TSSOP package (FE) with an exposed thermal pad (Pin 17 = PGND). Its thermal performance is specified as θJA = 40°C/W and TJMAX = 125°C. The exposed pad must be soldered to the PCB ground plane to achieve these ratings - failure to do so results in significantly degraded thermal impedance, as noted in the Absolute Maximum Ratings footnote.
Can the LTC3124EFE#TRPBF operate in Burst Mode® and be synchronized to an external clock simultaneously?
No, the LTC3124EFE#TRPBF cannot operate in Burst Mode® and synchronize to an external clock simultaneously. When an external clock signal is applied to the PWM/SYNC pin, Burst Mode® is automatically disabled and the internal oscillator locks to the external frequency. This is explicitly documented in the PIN FUNCTIONS section: "PWM/SYNC = External CLK. The internal oscillator is synchronized to the external CLK signal. Burst Mode operation is disabled."
LTC3124EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3124EFE#TRPBF FAQ
1.How can I place an order for LTC3124EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124EFE#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 LTC3124EFE#TRPBF reliable?
The price and inventory of LTC3124EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3124EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124EFE#TRPBF?
LTC3124EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124EFE#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 LTC3124EFE#TRPBF?
For technical support, including LTC3124EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3124EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3124EFE#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 LTC3124EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3124EFE#TRPBF?
All LTC3124EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124EFE#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 LTC3124EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3124EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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