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Analog Devices Inc. LTC3425EUH#PBF
- Part No.:
- LTC3425EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3425EUH#PBF.pdf
- Description:
- IC REG BOOST ADJ 5A 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:856
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Product details
Overview
LTC3425EUH#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-phase step-up DC/DC converter with true output disconnect, designed for low-input-voltage, high-current boost applications. It delivers up to 3A continuous output current, supports 0.5V–4.5V input and 2.4V–5.25V adjustable output, achieves up to 95% efficiency, and operates down to 0.88V start-up voltage - ideal for handheld computers and point-of-load regulators powered by single-cell Li-ion or NiMH batteries.
For engineers reviewing the LTC3425EUH#PBF datasheet, LTC3425EUH#PBF pinout, LTC3425EUH#PBF application, or LTC3425EUH#PBF equivalent, key selection criteria include its 4-phase architecture for ultra-low ripple, programmable peak current limit (1.8–7.0A), Burst Mode™ operation with 12µA VOUT quiescent current, and thermally enhanced 5mm × 5mm QFN-32 package with exposed pad.
Technical Context
The LTC3425EUH#PBF implements a current-mode, 4-phase synchronous boost architecture with adaptive slope compensation and independent start-up oscillator enabling operation below 1V input. Each phase integrates an N-channel MOSFET (RDS(ON) = 0.04Ω typical) and P-channel synchronous rectifier (RDS(ON) = 0.05Ω typical), delivering effective parallel RDS(ON) of 0.045Ω NMOS / 0.05Ω PMOS.
It supports fixed-frequency PWM (100kHz–2MHz per phase), synchronizable oscillator with SYNCIN/SYNCOUT, manual or automatic Burst Mode™, antiringing control, and true output disconnect via internal switches - eliminating inrush current and enabling zero-load shutdown. The error amplifier features 50µS transconductance and internal clamps for robust transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 4.5V - enables direct operation from single-cell batteries including discharged states. |
| Output Voltage Range | 2.4V to 5.25V - adjustable via external resistor divider on FB pin; regulated by 1.22V reference. |
| Max Output Current | 3A continuous - achieved using 4-phase interleaving to reduce per-phase current stress and thermal load. |
| Peak Efficiency | 95% - at VIN = 2.4V, VOUT = 3.3V, 2A load, 1MHz/phase in fixed-frequency mode. |
| Quiescent Current (Burst) | 12µA on VOUT - enables multi-day battery life in standby for portable devices. |
| Switching Frequency | 100kHz to 2MHz per phase - set by RT resistor; 4× effective ripple frequency reduces output capacitor requirements. |
| Start-Up Voltage | 0.88V minimum - allows cold-start from deeply discharged cells without external charge pump. |
Pinout & Package
The LTC3425EUH#PBF is housed in a thermally enhanced 32-pin QFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (Pin 33) soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWA–SWD (Pins 3,6,19,22) | Switch Node Outputs | Connect to boost inductors; each drives one phase; internal N-MOSFET drains; require short traces to minimize EMI. |
| VOUTA–VOUTD (Pins 4,5,20,21) | Synchronous Rectifier Outputs | Deliver boosted output; connect directly to individual ceramic output capacitors for lowest ESR path. |
| GNDA–GNDD (Pins 1,2,7,8,17,18,23,24) | Power Ground Terminals | Eight dedicated ground pins for low-impedance return paths for all four phases' power loops. |
| FB (Pin 12) | Feedback Input | Monitors output via resistor divider; regulates VOUT to 1.22V reference; trace must be shortest possible. |
| ILIM (Pin 27) | Peak Current Limit Set | Resistor-to-ground sets per-phase peak current (ILIM = 130/RILIM kΩ); min 75kΩ = 1.73A. |
| RT (Pin 28) | Oscillator Frequency Set | Resistor-to-ground programs switching frequency per phase: fOSC = 60/RT MHz (RT in kΩ). |
| BURST (Pin 14) | Burst Mode Threshold Control | RC network sets average load current threshold for automatic Burst Mode entry/exit. |
| CCM (Pin 26) | Continuous Conduction Mode Enable | Ground = auto CCM/DCM; tie to VOUT = forced CCM with ~0.6A reverse current capability. |
| PGOOD (Pin 16) | Open-Drain Power Good | Pulls low when FB drops >11.4% below regulation; requires external pull-up; max 10mA sink. |
| REFOUT (Pin 15) | Buffered 1.22V Reference | Active only when REFEN >1.4V; sources 100µA/sinks 10µA; requires 0.1µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Phase Interleaved Architecture | Reduces output ripple current by >90% vs single-phase; increases effective ripple frequency to 4× switching frequency. |
| True Output Disconnect | Internal switches isolate VOUT during shutdown - eliminates inrush, enables zero-load current, and prevents backfeed. |
| Antiringing Control | Internally damps SW-node ringing in DCM - suppresses high-frequency EMI without external snubbers. |
| Programmable Burst Mode Threshold | Adjustable average load current threshold via BURST pin RC network - optimizes light-load efficiency per application. |
| Independent Low-Voltage Start-Up Oscillator | Starts reliably at VIN ≥ 0.88V - no external bias required; operates unison across all phases until VOUT > VIN + 0.3V. |
Applications
| Handheld Computers | Point-of-Load Regulators |
|---|---|
Use Scenario: Powering 3.3V or 5V logic rails in PDAs and ultra-portables from single-cell Li-ion (2.7–4.2V) or NiMH (0.9–1.4V/cell) batteries. IC Role / Device Role / Timing Role: Primary synchronous boost regulator with output disconnect and soft-start; manages battery-to-system voltage translation. Use Value: Enables operation down to 0.88V input, extends runtime via 95% peak efficiency and 12µA Burst Mode quiescent current. | Use Scenario: Generating stable 3.3V/5V supplies for FPGA I/O banks, microcontroller cores, or sensor interfaces in space-constrained industrial modules. IC Role / Device Role / Timing Role: High-density, low-noise multiphase boost converter providing clean, regulated output with minimal external components. Use Value: 4-phase interleaving cuts output capacitor count by >50% vs single-phase; 5mm × 5mm QFN saves board area. |
| 3.3V to 5V Conversion | Low-Noise Portable Audio Supplies |
Use Scenario: Up-converting 3.3V system rail to 5V for USB peripherals, display drivers, or analog front-ends in battery-powered equipment. IC Role / Device Role / Timing Role: Efficient, adjustable-output boost stage with precise feedback regulation and power-good signaling. Use Value: Adjustable VOUT (2.4–5.25V) and ±1.2% reference accuracy ensure compliance with 5V ±5% specs under varying loads. | Use Scenario: Supplying ultra-low-noise 5V rails for DACs, ADCs, and headphone amplifiers in portable audio players. IC Role / Device Role / Timing Role: Fixed-frequency, low-ripple boost source with antiringing control and synchronized operation to avoid beat frequencies. Use Value: 4-phase operation pushes ripple energy to 4× fundamental frequency (>4MHz), easing filtering and reducing audible noise. |
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#TRPBF | Single-phase, 1.3A max output, 2.7–16V input, no output disconnect, larger 16-lead TSSOP package. | Lacks 4-phase ripple reduction and true output disconnect; suitable only for lower-current, non-battery-critical apps. | Select LT3467EFE#TRPBF only if cost and board area outweigh ripple/noise and battery-life requirements. |
| TPS61088RHLR | Single-phase, 4.5A max, 2.7–12V input, integrated 13mΩ/18mΩ FETs, no programmable burst threshold or antiringing. | No multiphase benefit; higher quiescent current (25µA) and no sub-1V start-up capability. | Choose TPS61088RHLR when higher peak current is needed but 4-phase advantages are not critical. |
Compared with LT3467EFE#TRPBF and TPS61088RHLR, the LTC3425EUH#PBF uniquely delivers 4-phase interleaving for ultra-low ripple, true output disconnect for zero-load shutdown, and reliable start-up below 1V - making it the only option for high-efficiency, low-noise, single-cell-powered systems demanding >2A output.
Availability
LTC3425EUH#PBF is available at Aetrix Electronics and suitable for handheld computers, point-of-load regulators, and 3.3V-to-5V conversion applications requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C ambient temperature.
Supply support for LTC3425EUH#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 LTC3425EUH#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for battery-powered portable electronics requiring ultra-low quiescent current, multiphase ripple reduction, and robust low-voltage operation.
FAQ
What is the minimum input voltage required for the LTC3425EUH#PBF to start up?
The LTC3425EUH#PBF features an independent start-up oscillator that enables reliable operation with input voltages as low as 0.88V (typical) and down to 1.0V (maximum) under no-load conditions. This allows cold-start from deeply discharged single-cell batteries without external assist circuitry. Once started and VOUT exceeds VIN + 0.3V, the IC powers itself from VOUT, permitting continued operation even if VIN drops to 0.5V.
Does the LTC3425EUH#PBF support synchronization with other converters?
Yes, the LTC3425EUH#PBF supports full oscillator synchronization via its SYNCIN and SYNCOUT pins. An external clock applied to SYNCIN can lock the internal oscillator frequency; SYNCOUT provides a 180° phase-shifted copy of the oscillator signal, enabling two LTC3425EUH#PBF devices to be synchronized into an 8-phase configuration. Note that synchronization is disabled during Burst Mode operation, where the oscillator is turned off.
How does the LTC3425EUH#PBF achieve true output disconnect, and why is it important?
The LTC3425EUH#PBF integrates internal MOSFET switches between the output and load path that fully disconnect VOUT during shutdown. This eliminates inrush current at power-on and ensures zero load current in shutdown - critical for preserving battery charge in portable devices and preventing backfeed into powered-down subsystems. Unlike diode-based solutions, this active disconnect maintains tight output regulation and avoids forward voltage drop penalties.
Can the LTC3425EUH#PBF operate with fewer than four phases, and what are the trade-offs?
Yes, the LTC3425EUH#PBF can operate as a 2-phase or 3-phase converter by omitting inductors from unused phases (e.g., leave SWC/SWD unconnected). Phase A remains active in all modes, including Burst Mode. Reducing phases lowers solution cost and board area but increases output ripple current and peak inductor current - e.g., 2-phase operation shows ~89% higher peak ripple vs 4-phase at 2A load. Efficiency penalty is modest (<2%) below 1A load but grows as input voltage decreases.
What is the role of the CCM pin on the LTC3425EUH#PBF, and how does it affect operation?
The CCM (Continuous Conduction Mode) pin on the LTC3425EUH#PBF selects conduction behavior: grounded for automatic CCM/DCM transition, or tied to VOUT to force continuous conduction mode. In forced CCM, the synchronous rectifier allows up to ~0.6A reverse current before turning off - improving large-signal transient response (e.g., heavy-to-light load steps) and eliminating pulse skipping noise. However, forced CCM increases light-load losses and disables Burst Mode operation.
LTC3425EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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):
- 0.5V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3425EUH#PBF FAQ
1.How can I place an order for LTC3425EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3425EUH#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 LTC3425EUH#PBF reliable?
The price and inventory of LTC3425EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3425EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3425EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3425EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3425EUH#PBF?
LTC3425EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3425EUH#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 LTC3425EUH#PBF?
For technical support, including LTC3425EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3425EUH#PBF requirements.
6.How does Aetrix verify that LTC3425EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3425EUH#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 LTC3425EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3425EUH#PBF?
All LTC3425EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3425EUH#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 LTC3425EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3425EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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