My Inquiry
My Account
Analog Devices Inc. LTC3428EDD#PBF
- Part No.:
- LTC3428EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3428EDD#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:518
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3428EDD#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, current-mode synchronous boost DC/DC converter IC designed for high-efficiency local voltage step-up in space-constrained systems. It delivers up to 2A at 5V from a 3.3V input, operates from 1.6V to 4.5V input, supports 1.6V–5.25V adjustable output, and integrates two 93mΩ N-channel MOSFETs in a thermally enhanced 10-lead 3mm × 3mm DFN package.
For engineers reviewing the LTC3428EDD#PBF datasheet, LTC3428EDD#PBF pinout, LTC3428EDD#PBF application, or LTC3428EDD#PBF equivalent, key selection criteria include dual-phase ripple reduction, internal soft-start, <1μA shutdown current, 1MHz per-phase switching, and thermal shutdown with exposed pad grounding requirements.
Technical Context
The LTC3428EDD#PBF implements adaptive slope-compensated current-mode control across two 180°-phase-shifted channels, enabling stable loop response without external slope injection. Its dual-phase architecture reduces peak inductor current by 53% and output capacitor ripple current by 85% versus single-phase equivalents, doubling effective ripple frequency to 2MHz.
Each phase features independent current limiting (2.5A typ), lossless current sensing, antiringing control during discontinuous conduction mode, and integrated 93mΩ NMOS switches. The error amplifier (170μS transconductance) uses VC pin for external compensation, while FB pin references a precision 1.243V internal bandgap for output regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 4.5V - supports Li-ion, NiMH, and low-voltage logic rails without pre-regulation |
| Output Voltage Range | 1.6V to 5.25V - programmable via resistor divider on FB pin using VOUT = 1.243V × (1 + R1/R2) |
| Switching Frequency | 1.0MHz per phase - enables use of compact 2.2μH inductors and low-ESR ceramic capacitors |
| Peak Current Limit | 2.5A per phase - limits inductor stress and ensures safe operation under transient overload |
| Shutdown Current | <1μA - preserves battery life in portable devices during standby |
| Efficiency | Up to 92% at 2A/5V from 3.3V - achieved via low-RDS(ON) switches and dual-phase current sharing |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN (DD package) with 0.75mm profile and thermally enhanced exposed pad (PGNDA/PGNDB/Exposed Pad) requiring solder connection to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGNDA (Pin 1), PGNDB (Pin 10), Exposed Pad | Power Ground | Low-impedance return path for both switch phases; must be soldered to large copper ground plane for thermal and EMI performance |
| SWA (Pin 2), SWB (Pin 9) | Phase A/B Switch Node | Connects to respective inductor and Schottky diode; minimized trace length critical to reduce EMI and ringing |
| VOUT (Pin 3) | Regulated Output / Bootstrap Supply | Delivers regulated output and powers internal gate drivers; requires low-ESR ceramic capacitor directly to ground |
| SHDN (Pin 4) | Active-Low Enable | Pull below 0.8V to disable; draws <1μA in shutdown; pull above 1.5V to enable |
| VC (Pin 5) | Error Amplifier Output | Connects to external R-C compensation network; internal 5pF capacitor simplifies design |
| FB (Pin 6) | Feedback Input | Senses output via resistor divider; regulates output to 1.243V reference; input bias current <50nA |
| AGND (Pin 7) | Signal Ground | Reference for FB and VC; connect near feedback resistors to minimize noise coupling |
| VIN (Pin 8) | Main Input Supply | Bypass with ≥4.7μF X5R/X7R ceramic capacitor close to pin; powers internal circuitry and gate drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | Reduces output capacitor RMS current by 85%, enabling smaller 22μF ceramic output caps instead of larger electrolytics |
| Adaptive slope compensation | Automatically adjusts for input voltage changes, maintaining loop stability without manual tuning across input range |
| Antiringing control | Damps LC ringing on SWA/SWB pins during DCM, reducing high-frequency EMI without snubbers |
| Internal soft-start (1.5ms) | Prevents inrush current and output overshoot during power-up; automatically discharges in shutdown |
| Thermal shutdown (150°C typical) | Protects device during sustained overload; resumes operation after junction cools below threshold |
Applications
| Networking Equipment | Handheld Instruments |
|---|---|
Use Scenario: Providing 5V/2A rail from 3.3V backplane in compact Ethernet switches or PoE injectors. IC Role / Device Role / Timing Role: Dual-phase boost converter delivering regulated 5V with low output ripple for PHY and management ICs. Use Value: 2MHz effective ripple frequency eases filtering requirements, allowing small 22μF ceramic output caps instead of bulkier alternatives. | Use Scenario: Powering 5V sensors and microcontrollers from single-cell Li-ion (3.0–4.2V) in portable test meters. IC Role / Device Role / Timing Role: High-efficiency step-up regulator with <1μA shutdown current extending battery runtime between measurements. Use Value: 92% efficiency at 2A load minimizes heat buildup in sealed enclosures; 1.6V startup enables operation down to nearly depleted cells. |
| Digital Cameras | Distributed Power |
Use Scenario: Generating 5V for image sensor and flash LED drivers from 3.3V system rail in DSLR viewfinder modules. IC Role / Device Role / Timing Role: Dual-phase boost IC supplying clean, low-noise 5V with fast transient response to handle burst LED current demands. Use Value: Interleaved phases cut peak inductor current by 53%, permitting use of low-profile 2.2μH shielded inductors in height-sensitive camera assemblies. | Use Scenario: Local 3.3V-to-5V conversion for FPGA I/O banks or USB controllers on multi-rail industrial PCBs. IC Role / Device Role / Timing Role: Compact, thermally robust boost converter replacing discrete solutions in dense board layouts. Use Value: Exposed-pad DFN package with θJC = 3°C/W enables reliable 2A operation without heatsinks, simplifying thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3426EDD#PBF | Single-phase, 2A, 1MHz, same DFN-10 package but no interleaving; higher output ripple and peak inductor current | Lacks dual-phase ripple reduction; suitable only where size/efficiency trade-off favors simplicity over low-noise output | Select when board area is constrained and output ripple tolerance allows single-phase design |
| LTC3425EFE#PBF | 4-phase, 5A, 8MHz, QFN-32 package; higher integration but larger footprint and more complex layout | Supports higher current and faster transient response; requires more external components and PCB real estate | Select for >2.5A loads or where 8MHz switching enables ultra-small passive components |
Compared with LTC3428EDD#PBF, LTC3426EDD#PBF offers identical package and pin count but sacrifices dual-phase benefits for simpler design, while LTC3425EFE#PBF scales current and frequency at the cost of package size and layout complexity-making LTC3428EDD#PBF the optimal balance of performance, size, and thermal efficiency for 2A applications.
Availability
LTC3428EDD#PBF is available at Aetrix Electronics and suitable for networking equipment, handheld instruments, digital cameras, and distributed power systems requiring stable component supply, industrial temperature range support, and lead-free compliance.
Supply support for LTC3428EDD#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 analog and power management ICs with rigorous qualification and long-term product support.
The LTC3428EDD#PBF belongs to Linear's high-efficiency boost converter product line, engineered specifically for compact, high-current local DC/DC conversion where low EMI, thermal efficiency, and minimal external component count are critical.
FAQ
What is the minimum input voltage required to start up the LTC3428EDD#PBF?
The LTC3428EDD#PBF has a guaranteed minimum startup voltage of 1.6V, with a typical value of 1.5V. This allows reliable operation from partially discharged single-cell Li-ion or NiMH batteries. Startup behavior is verified across the full –40°C to +85°C temperature range, and the device sustains regulation down to 1.6V input during normal operation.
How does the dual-phase architecture of the LTC3428EDD#PBF reduce output voltage ripple?
The LTC3428EDD#PBF uses two 180°-phase-shifted boost channels, doubling the effective ripple frequency to 2MHz. This reduces output capacitor RMS current by 85% (e.g., from 4.34A to 0.64A at 2A load) and cuts peak inductor current by 53%, enabling smaller ceramic output capacitors and lower-profile inductors without compromising stability or noise performance.
Can the LTC3428EDD#PBF operate with an output voltage lower than 5V?
Yes, the LTC3428EDD#PBF supports adjustable output voltages from 1.6V to 5.25V using a resistor divider on the FB pin. The regulation equation is VOUT = 1.243V × (1 + R1/R2), where the 1.243V is the precise internal reference. Output accuracy is maintained across temperature and load, with FB input current below 50nA minimizing divider error.
What thermal management practices are required for reliable 2A operation of the LTC3428EDD#PBF?
For continuous 2A operation, the LTC3428EDD#PBF requires soldering its exposed thermal pad (PGNDA/PGNDB) to a solid PCB ground plane using multiple thermal vias. With θJC = 3°C/W and θJA = 45°C/W, this ensures junction temperature remains below 125°C under worst-case ambient conditions. Thermal shutdown activates at ~150°C to protect the device during transient overloads.
Is external compensation mandatory for the LTC3428EDD#PBF feedback loop?
Yes, external compensation is required via the VC pin to stabilize the current-mode control loop. While an internal 5pF capacitor simplifies design, a series R-C network from VC to AGND is necessary to set dominant pole and zero locations. Proper compensation accounts for the right-half-plane zero inherent to boost topology and ensures stability across input/output voltage and load variations.
LTC3428EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 1.6V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3428EDD#PBF FAQ
1.How can I place an order for LTC3428EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3428EDD#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 LTC3428EDD#PBF reliable?
The price and inventory of LTC3428EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3428EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3428EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3428EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3428EDD#PBF?
LTC3428EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3428EDD#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 LTC3428EDD#PBF?
For technical support, including LTC3428EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3428EDD#PBF requirements.
6.How does Aetrix verify that LTC3428EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3428EDD#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 LTC3428EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3428EDD#PBF?
All LTC3428EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3428EDD#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 LTC3428EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3428EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3428EDD#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
