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Analog Devices Inc. LTC3124IFE#PBF
- Part No.:
- LTC3124IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3124IFE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LTC3124IFE#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 or 0.5V post-start. It features programmable switching frequency (100kHz–3MHz), 2.5A per-phase peak current limit, and Burst Mode® operation achieving 25µA quiescent current-enabling high-efficiency power conversion for RF power amplifiers, piezo actuators, and 12V analog rails sourced from batteries or backup capacitors.
For engineers reviewing the LTC3124IFE#PBF datasheet, LTC3124IFE#PBF pinout, LTC3124IFE#PBF application, or LTC3124IFE#PBF 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 low-input-voltage systems requiring sustained regulation down to 500mV.
Technical Context
The LTC3124IFE#PBF 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 without external compensation complexity. Its dual-phase architecture reduces output capacitor RMS ripple current by ~70% versus single-phase equivalents at identical load and frequency.
It integrates N-channel MOSFET switches (RDS(ON) = 0.13Ω per phase) and P-channel synchronous rectifiers (RDS(ON) = 0.20Ω per phase), supported by lossless peak-current sensing, zero-current detection (~50mA threshold), and anti-ringing circuitry activated when VOUT ≥ VIN + 2V to suppress SW-pin EMI during discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V start-up; sustains regulation down to 0.5V after start (≥2.5V VOUT)-maximizes energy extraction from depleted batteries. |
| Output Voltage Range | Adjustable 2.5V to 15V via resistor divider on FB pin-supports 12V analog rails, RF PA bias, and piezo drive voltages. |
| Peak Current Limit | 2.5A per phase (typical), 3.5A max-enables 1.5A continuous output at 5VIN/12VOUT with margin for transients. |
| Switching Frequency | Programmable 100kHz–3MHz via RT resistor; synchronizable to external clock-optimizes efficiency vs. footprint trade-offs. |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown-extends battery life in always-on sensor or standby systems. |
| Efficiency | Up to 95% (synchronous rectification)-reduces thermal load in compact enclosures without heatsinks. |
| Package | 16-lead thermally-enhanced TSSOP (FE package), exposed PGND pad-provides θJA = 40°C/W for industrial temperature range (–40°C to 125°C). |
Pinout & Package
Package: 16-lead plastic TSSOP (FE), 5mm × 4.4mm × 1.1mm body, exposed thermal pad (Pin 17) soldered to PGND for rated thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWA, SWB (Pins 1, 3) | Phase A/B switch nodes | Connect to respective boost inductors; internal anti-ringing resistors activate when VOUT ≥ VIN + 2V to suppress EMI. |
| PGNDA, PGNDB, PGND (Pins 4, 2, 17) | Power ground return paths | Exposed pad (Pin 17) must be soldered to PCB ground plane-critical for thermal dissipation and low-noise switching. |
| VIN (Pin 5) | Main input supply | Supplies IC when >3.5V; drops to VOUT backup below ~3V-enables operation from weak or decaying sources. |
| PWM/SYNC (Pin 6) | Mode select & sync input | High = fixed-frequency PWM; Low = Burst Mode®; external clock = synchronization-no floating allowed. |
| VCC (Pin 7) | Internal LDO output | Regulated ~4.25V rail derived from VIN or VOUT-powers gate drivers; UVLO at ~1.5V disables switching. |
| RT (Pin 8) | Oscillator frequency set | Resistor to SGND programs fSW ≈ 28/RT (MHz); e.g., 28kΩ → 1MHz-enables precise noise-sensitive layout control. |
| FB (Pin 10) | Feedback reference input | 1.200V ±2.4% reference; sets VOUT = 1.2V × (1 + R1/R2)-supports 2.5V–15V adjustment with standard resistor values. |
| SD (Pin 11) | Logic shutdown control | High (>1.6V) enables operation; low (<0.25V) disconnects output and draws <1µA-true output isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaving | Reduces output voltage ripple amplitude and frequency-doubles ripple content-enables smaller, lower-ESR output capacitors and easier EMI filtering. |
| True output disconnect | Physically isolates VOUTA/VOUTB from VIN during shutdown-prevents backfeed, supports hot-swap and system-level power sequencing. |
| Inrush current limiting | 10ms internal soft-start ramps VOUT reference linearly-limits input surge without external timing components or complex control. |
| Burst Mode® operation | 25µA quiescent current at light loads-maintains >80% efficiency down to 100µA output current, critical for battery longevity. |
| Low-voltage start-up & operation | Starts from 1.8V, regulates continuously down to 0.5V input-extracts maximum usable energy from primary cells or supercapacitors. |
| Robust protection suite | Includes overvoltage lockout (16.5V), thermal shutdown (170°C), short-circuit current limiting, and anti-ringing-ensures field reliability without external supervision. |
Applications
| RF Power Amplifier Bias | Piezo Actuator Drive |
|---|---|
Use Scenario: Generating stable 12V–15V bias for GaAs or GaN RF PAs in portable radios or IoT edge transceivers. IC Role / Device Role / Timing Role: Dual-phase synchronous boost converter providing regulated high-voltage rail with minimal output ripple and fast load transient response. Use Value: Enables compact, efficient RF front-end designs by eliminating discrete charge pumps or transformer-based solutions while maintaining PSRR >60dB at 1MHz. |
Use Scenario: Driving high-voltage piezoelectric elements in precision positioning stages, ultrasonic cleaners, or medical imaging transducers. IC Role / Device Role / Timing Role: Adjustable-output boost regulator delivering clean, low-noise 2.5V–15V with controlled slew rate and inrush limiting. Use Value: Prevents mechanical shock and electrode degradation by eliminating voltage overshoot during startup and ensuring stable hold voltage under dynamic load. |
| 12V Analog Rail from Battery | Small DC Motor / Thermal Printer Supply |
Use Scenario: Creating isolated 12V analog supply from 3.3V or 5V Li-ion battery packs in data acquisition modules or industrial sensors. IC Role / Device Role / Timing Role: Synchronous step-up converter with true output disconnect, allowing seamless switchover between battery and backup capacitor sources. Use Value: Maintains uninterrupted analog subsystem operation during brownouts or battery replacement-no hold-up capacitor sizing required beyond 10µF/cap. |
Use Scenario: Powering miniature 12V DC motors in handheld thermal printers, barcode scanners, or portable lab equipment. IC Role / Device Role / Timing Role: High-efficiency boost regulator supporting intermittent 1.5A peak loads with integrated inrush limiting and thermal foldback. Use Value: Eliminates need for external current-limiting FETs or resettable fuses-reduces BOM count and improves motor torque consistency across battery discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDD#PBF | Single-phase, 40V max VOUT, 1.5A switch current, no output disconnect, 3mm × 3mm DFN | Suitable for higher-VOUT but lacks dual-phase ripple reduction and true output isolation | Select when VOUT >15V needed and board space is constrained; verify external disconnect FET if isolation required. |
| TPS61088RHLR | Single-phase, 12.6V max VOUT, 8A switch current, no programmable frequency, 3mm × 3mm QFN | Higher current capability but limited VOUT range and no Burst Mode® sub-100µA IQ | Prefer for high-current, fixed-12V applications where ultra-low IQ and wide VOUT adjustability are secondary. |
Compared with LT8330EDD#PBF and TPS61088RHLR, the LTC3124IFE#PBF uniquely combines dual-phase ripple suppression, true output disconnect, and sub-30µA Burst Mode® IQ across a 2.5V–15V adjustable range-making it optimal for space-constrained, battery-powered systems demanding both precision regulation and extended runtime.
Availability
LTC3124IFE#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, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC3124IFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3124IFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for demanding portable, industrial, and instrumentation applications requiring ultra-low quiescent current, wide input/output flexibility, and robust protection.
FAQ
What is the minimum input voltage required to start up the LTC3124IFE#PBF?
The LTC3124IFE#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 down to 0.5V input for VOUT ≥ 2.5V-enabling deep battery discharge utilization. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range" parameters.
Does the LTC3124IFE#PBF provide true output disconnect, and how is it implemented?
Yes, the LTC3124IFE#PBF provides true output disconnect: when the SD pin is pulled low (<0.25V), both internal synchronous rectifiers are disabled and VOUTA/VOUTB are physically isolated from VIN. This prevents backfeed and supports safe hot-swap operation. The feature is explicitly documented in the FEATURES section and verified in the PIN FUNCTIONS description for SD and VOUTA/VOUTB pins.
How is the switching frequency programmed on the LTC3124IFE#PBF, and what is the valid range?
The LTC3124IFE#PBF switching frequency is programmed via an external resistor (RT) from Pin 8 to SGND, using the formula fSW ≈ 28/RT (MHz). Valid range is 100kHz to 3MHz, corresponding to RT values from 316kΩ to 8.06kΩ. Table 1 in the datasheet lists exact RT values, and the oscillator can also be synchronized to an external clock signal applied to the PWM/SYNC pin.
What thermal performance can be expected from the LTC3124IFE#PBF in its TSSOP package?
The LTC3124IFE#PBF in the 16-lead TSSOP (FE) package has a junction-to-ambient thermal resistance (θJA) of 40°C/W and junction-to-case (θJC) of 10°C/W, measured with the exposed PGND pad fully soldered to the PCB ground plane. This allows continuous operation at full load up to 125°C ambient when using appropriate copper area and airflow-verified in the ORDER INFORMATION and PIN CONFIGURATION sections.
Can the LTC3124IFE#PBF operate with input voltages below 1V after start-up?
Yes-the LTC3124IFE#PBF maintains regulation with input voltages as low as 0.5V after start-up, provided the output voltage is ≥2.5V. This capability is explicitly specified in the ELECTRICAL CHARACTERISTICS table under "Input Voltage Range" and is enabled by the internal VCC regulator's ability to draw power from VOUT when VIN falls below ~3V.
LTC3124IFE#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
LTC3124IFE#PBF FAQ
1.How can I place an order for LTC3124IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3124IFE#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 LTC3124IFE#PBF reliable?
The price and inventory of LTC3124IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3124IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3124IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3124IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3124IFE#PBF?
LTC3124IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3124IFE#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 LTC3124IFE#PBF?
For technical support, including LTC3124IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3124IFE#PBF requirements.
6.How does Aetrix verify that LTC3124IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3124IFE#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 LTC3124IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3124IFE#PBF?
All LTC3124IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3124IFE#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 LTC3124IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3124IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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