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Analog Devices Inc. LTC3124IFE#TRPBF
- Part No.:
- LTC3124IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3124IFE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,644
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Product details
Overview
LTC3124IFE#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 start-up. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase 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 LTC3124IFE#TRPBF datasheet, LTC3124IFE#TRPBF pinout, LTC3124IFE#TRPBF application, or LTC3124IFE#TRPBF equivalent, key selection considerations include its dual-phase ripple reduction, output disconnect capability during shutdown, 16-lead TSSOP thermal performance (θJA = 40°C/W), and compatibility with 2.5V–15V adjustable output configurations using external resistor dividers.
Technical Context
The LTC3124IFE#TRPBF implements current-mode PWM control with adaptive slope compensation across two interleaved 180°-phased boost stages, enabling high line/load regulation and fast transient response. Its dual-phase architecture reduces output capacitor RMS ripple current by ~70% versus single-phase equivalents at identical load and duty cycle.
It integrates N-channel MOSFET switches (RDS(ON) = 130mΩ per phase) and P-channel synchronous rectifiers (RDS(ON) = 200mΩ per phase), with lossless peak-current sensing, zero-current detection (~50mA threshold), and anti-ringing circuitry activated when VOUT ≥ VIN + 2V to suppress SW-pin EMI.
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 | Adjustable 2.5V to 15V via FB divider - supports 12V analog rails and RF PA biasing |
| Switching Frequency | Programmable 100kHz–3MHz (via RT resistor); synchronizable to external clock - balances efficiency vs. size/noise |
| Peak Current Limit | 2.5A per phase (typ), 3.5A max - sets inductor sizing and short-circuit robustness |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown - extends battery life in always-on sensor nodes |
| Efficiency | Up to 95% (synchronous rectification) - minimizes thermal load in compact enclosures |
| Package | 16-lead thermally-enhanced TSSOP (FE package), exposed pad tied to PGND - θJA = 40°C/W, rated for –40°C to 125°C |
Pinout & Package
Package: 16-lead plastic TSSOP (FE), 5mm × 4.4mm × 1.2mm body, exposed thermal pad (Pin 17) soldered to PGND for optimal 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 engage when VOUT ≥ VIN + 2V |
| PGNDA, PGNDB, PGND (Pins 4, 2, 17) | Power ground return | Must be low-impedance path to output capacitors; exposed pad (Pin 17) is mandatory PGND connection |
| VIN (Pin 5) | Main input supply | Powers IC when >3.5V; drops to VOUT supply below ~3V - enables ultra-low-VIN operation |
| PWM/SYNC (Pin 6) | Mode control & sync input | High = fixed-frequency PWM; Low = Burst Mode®; external CLK = synchronization at 2× fSW |
| 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 - e.g., 28kΩ → 1MHz |
| FB (Pin 10) | Feedback reference input | 1.200V (±2%) reference; output voltage set by R1/R2 divider: VOUT = 1.2V × (1 + R1/R2) |
| SD (Pin 11) | Shutdown control | Logic-high (>1.6V) enables operation; logic-low (<0.25V) disconnects output and draws <1µA |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaving | Reduces output ripple current by ~70% and doubles ripple frequency - cuts required output capacitance and eases EMI filtering |
| True output disconnect | Internal switches isolate VOUT from VIN during shutdown - prevents backfeed and enables safe hot-swap in multi-rail systems |
| Inrush current limiting | 10ms internal soft-start ramps reference voltage linearly - eliminates input capacitor stress without external components |
| Burst Mode® operation | 25µA quiescent current at light loads - maintains >80% efficiency down to 100µA output current |
| Wide input voltage support | Operates from 500mV after start-up - extracts maximum energy from depleted batteries or supercapacitors |
| Robust protection suite | Includes overvoltage lockout (16.5V), thermal shutdown (170°C), and short-circuit current limiting - ensures field reliability |
Applications
| RF Power Amplifier Bias | Piezo Actuator Drive |
|---|---|
Use Scenario: Generating stable 12V–15V bias for GaAs/GaN RF PAs 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-efficiency voltage step-up with output disconnect during transmit/receive switching. Use Value: 95% peak efficiency and <10mVPP output ripple at 1.5A enable clean PA operation; Burst Mode® extends battery runtime in intermittent TX modes. |
Use Scenario: Driving high-voltage piezoelectric elements (e.g., inkjet nozzles, ultrasonic cleaners) requiring 50–100V pulses from low-voltage microcontrollers. IC Role / Device Role / Timing Role: Adjustable-output boost controller supplying precise, regulated high-voltage rails with fast transient response to digital pulse commands. Use Value: Programmable 2.5V–15V output range and 100kHz–3MHz fSW allow optimization for piezo charge/discharge timing; dual-phase reduces voltage droop during rapid actuation. |
| 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 handheld label printers. IC Role / Device Role / Timing Role: High-current dual-phase boost converter delivering regulated 12V with inrush limiting to prevent USB port overcurrent faults. Use Value: 2.5A per-phase current limit and internal soft-start ensure reliable cold-start under full load; TSSOP package supports compact PCB layout near print head. |
Use Scenario: Creating isolated 12V analog supply for op-amps, ADCs, or sensors in battery-powered instrumentation where noise and efficiency are critical. IC Role / Device Role / Timing Role: Low-quiescent-current boost regulator generating clean, ripple-suppressed 12V from 3.3V or 5V system rails. Use Value: 25µA Burst Mode® IQ and dual-phase ripple reduction minimize conducted noise into sensitive analog sections; output disconnect prevents cross-talk during sleep 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, 50µA IQ in shutdown | Limited to lower current and lacks dual-phase ripple reduction or true output isolation | Choose for cost-sensitive, space-constrained designs where ≤1.3A and no disconnect are acceptable |
| TPS61088RHLR | Single-phase, 5A switch current, 2.7V–12V input, no sub-1V operation, 20µA IQ in shutdown | Cannot start from <1.8V or sustain from <2.7V; no programmable fSW or external sync | Prefer for higher-current, mid-input applications where ultra-low-VIN and dual-phase benefits are unnecessary |
Compared with LT3467EFE#PBF and TPS61088RHLR, the LTC3124IFE#TRPBF uniquely delivers dual-phase ripple suppression, true output disconnect, and operational capability down to 500mV - making it the only option among the three suitable for deep-discharge battery systems requiring clean, isolated 12V+ rails.
Availability
LTC3124IFE#TRPBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, piezo actuator drive, thermal printer head supply, and 12V analog rail generation requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for LTC3124IFE#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 portfolio with rigorous automotive-grade qualification and long-term product longevity commitments.
The LTC3124IFE#TRPBF belongs to Linear's precision DC/DC converter family designed specifically for demanding portable and industrial applications requiring ultra-low input voltage operation, high efficiency across wide load ranges, and robust protection in space-constrained layouts.
FAQ
What is the minimum input voltage required to start up the LTC3124IFE#TRPBF?
The LTC3124IFE#TRPBF requires a minimum of 1.6V (typical 1.8V) on VIN to initiate startup. Once operating, it sustains regulation even as VIN falls to 500mV - a critical feature for maximizing energy extraction from deeply discharged batteries or backup capacitors. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range".
Does the LTC3124IFE#TRPBF provide true output disconnect, and how is it controlled?
Yes, the LTC3124IFE#TRPBF provides true output disconnect: when the SD pin is pulled below 0.25V, internal switches isolate VOUTA/VOUTB from VIN, reducing leakage to <1µA. This prevents backfeed into the input source and enables safe hot-swap or multi-rail sequencing. The function is explicitly documented in the FEATURES section and PIN FUNCTIONS description for SD.
How is the switching frequency programmed on the LTC3124IFE#TRPBF?
The LTC3124IFE#TRPBF switching frequency is set via an external resistor (RT) from Pin 8 to SGND, using the formula fSW ≈ 28 / RT(kΩ) MHz. For example, a 28kΩ resistor yields ~1MHz per phase. The oscillator can also be synchronized to an external clock applied to PWM/SYNC at twice the desired fSW, as detailed in the OSCILLATOR and PWM/SYNC pin descriptions.
What package type and thermal characteristics does the LTC3124IFE#TRPBF use?
The LTC3124IFE#TRPBF uses a 16-lead plastic TSSOP (FE package) with an exposed thermal pad (Pin 17) that must be soldered to PGND. Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W, rated for –40°C to 125°C operation. This is specified in the ORDER INFORMATION table and PIN CONFIGURATION diagrams.
Can the LTC3124IFE#TRPBF operate with input voltages below 1V after startup?
Yes - the LTC3124IFE#TRPBF continues regulating its output down to VIN = 500mV (0.5V) after initial startup, provided VOUT ≥ 2.5V. This ultra-low operating voltage is enabled by its internal VCC regulation architecture, which dynamically selects between VIN and VOUT to maintain bias. The specification is verified in the ELECTRICAL CHARACTERISTICS table under "Input Voltage Range".
LTC3124IFE#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
LTC3124IFE#TRPBF FAQ
1.How can I place an order for LTC3124IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124IFE#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 LTC3124IFE#TRPBF reliable?
The price and inventory of LTC3124IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3124IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124IFE#TRPBF?
LTC3124IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124IFE#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 LTC3124IFE#TRPBF?
For technical support, including LTC3124IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3124IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3124IFE#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 LTC3124IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3124IFE#TRPBF?
All LTC3124IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124IFE#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 LTC3124IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3124IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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