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Analog Devices Inc. LTC3428EDD#TRPBF
- Part No.:
- LTC3428EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3428EDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,022
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Product details
Overview
LTC3428EDD#TRPBF 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 applications. 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#TRPBF datasheet, LTC3428EDD#TRPBF pinout, LTC3428EDD#TRPBF application, or LTC3428EDD#TRPBF equivalent, key selection criteria include dual-phase ripple reduction, internal soft-start, <1μA shutdown current, 1MHz per-phase switching frequency, and thermal shutdown with 125°C TJMAX.
Technical Context
The LTC3428EDD#TRPBF implements adaptive slope-compensated current-mode control across two 180°-interleaved phases, eliminating the right-half-plane zero's dominant impact on loop stability while enabling simple R-C compensation via the VC pin. Its dual-phase architecture doubles effective switching frequency to 2MHz, reducing peak inductor current by 53% and output capacitor ripple current by 85% versus single-phase equivalents.
Each phase features independent 2.5A peak current limiting, 40ns blanking for noise immunity, and antiringing control to damp SWA/SWB node ringing during discontinuous conduction mode. The error amplifier provides 170μS transconductance and references to a precision 1.243V internal bandgap, enabling accurate output regulation over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 4.5V - enables operation from single Li-ion, NiMH, or low-voltage logic rails |
| Output Voltage Range | 1.6V to 5.25V - programmable via external resistor divider for flexible system rail generation |
| Max Output Current | 2A at 5V from 3.3V input - sustained delivery under full load with thermal management |
| Switching Frequency | 1MHz per phase - allows use of compact 2.2μH inductors and low-ESR ceramic capacitors |
| Efficiency | Up to 92% - achieved via integrated 93mΩ MOSFETs and optimized gate drive minimizing conduction & switching losses |
| Shutdown Current | <1μA - preserves battery life in standby or sleep modes without external disconnect circuitry |
| Feedback Reference | 1.243V ±25mV - tight tolerance ensures accurate output regulation across temperature and line/load conditions |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (DD package), 0.75mm profile, lead-free finish, rated for –40°C to +85°C ambient operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGNDA (Pin 1), PGNDB (Pin 10), Exposed Pad (Pin 11) | Power Ground | Dedicated low-impedance return paths for phase A/B power loops; exposed pad is primary thermal path to PCB |
| SWA (Pin 2), SWB (Pin 9) | Phase A/B Switch Nodes | Connect to inductor and Schottky diode anodes; minimized trace length critical for EMI suppression |
| VOUT (Pin 3) | Regulated Output & Bootstrap Supply | Delivers final output voltage and powers internal gate drivers; requires low-ESR ceramic capacitor directly to ground |
| SHDN (Pin 4) | Active-Low Enable Control | Pull below 0.4V to disable; >1.5V to enable; draws <1μA in shutdown state |
| VC (Pin 5) | Error Amplifier Output | Interface for external R-C compensation network; internal 5pF capacitor simplifies loop stabilization |
| FB (Pin 6) | Feedback Input | Senses output via resistor divider; regulates VOUT = 1.243V × (1 + R1/R2); input bias current ≤50nA |
| AGND (Pin 7) | Signal Ground | Reference for FB, VC, and internal analog circuitry; must tie near feedback resistors to avoid noise coupling |
| VIN (Pin 8) | Main Input Supply | Powers internal circuitry and gate drivers; requires ≥4.7μF low-ESR ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | Reduces output ripple current by 85% and doubles effective switching frequency to 2MHz, enabling smaller passive components |
| Integrated 93mΩ N-channel MOSFETs | Eliminates need for external switches, reduces BOM count, and improves efficiency over discrete solutions |
| Adaptive slope compensation | Automatically adjusts to input voltage changes, maintaining loop stability without manual tuning across input range |
| Antiringing control | Damps high-frequency LC ringing on SWA/SWB pins during DCM, lowering radiated EMI without snubbers |
| Internal soft-start (1.5ms) | Prevents inrush current and output overshoot during startup; automatically discharges in shutdown mode |
Applications
| Networking Equipment | Handheld Instruments |
|---|---|
Use Scenario: Powering 5V Ethernet PHYs or USB controllers from a 3.3V system rail in compact routers or access points. IC Role / Device Role / Timing Role: Dual-phase boost converter providing regulated 5V/2A with minimal board area and low EMI. Use Value: Enables single-rail 3.3V system design without external LDOs or charge pumps, reducing component count and thermal stress. | Use Scenario: Generating stable 5V supply for microcontroller peripherals and sensors in portable test meters or data loggers. IC Role / Device Role / Timing Role: High-efficiency step-up regulator supporting battery-powered operation with extended runtime. Use Value: <1μA shutdown current preserves battery life during idle periods; 1.6V minimum start-up supports deep discharge recovery. |
| Digital Cameras | Distributed Power |
Use Scenario: Supplying 5V to image sensor interfaces and flash LED drivers from a 2.5V–3.3V Li-ion battery source. IC Role / Device Role / Timing Role: Fast-transient-response boost converter delivering clean, low-noise 5V rail for sensitive analog imaging circuits. Use Value: Dual-phase architecture minimizes output voltage ripple (<50mV p-p with 22μF ceramic), preventing image noise artifacts. | Use Scenario: Local 3.3V-to-5V conversion for isolated I/O modules or FPGA configuration supplies in industrial PLC backplanes. IC Role / Device Role / Timing Role: Robust, thermally managed boost stage operating continuously under 40°C–85°C ambient conditions. Use Value: Exposed thermal pad and 45°C/W θJA allow reliable 2A output without heatsinks in dense layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3426EDD#TRPBF | Single-phase, 2A max, 1MHz, same DFN-10 package but no interleaving; higher output ripple and larger inductors required | Limited to lower-noise-tolerance systems where board area is less constrained than EMI requirements | Select when cost sensitivity outweighs ripple/EMI performance and thermal headroom is sufficient |
| LTC3425EFE#TRPBF | 4-phase, 5A, 8MHz, QFN-32 package; higher integration but incompatible pinout, footprint, and compensation scheme | Suitable for higher-current, ultra-compact designs requiring >2A with aggressive size targets | Choose only when scaling beyond 2A is needed and redesign of layout, compensation, and thermal management is acceptable |
Compared with LTC3426EDD#TRPBF, the LTC3428EDD#TRPBF delivers superior ripple suppression and thermal performance at identical current rating; versus LTC3425EFE#TRPBF, it offers drop-in compatibility for 2A designs with proven layout reuse and simpler loop compensation.
Availability
LTC3428EDD#TRPBF is available at Aetrix Electronics and suitable for networking equipment, handheld instruments, digital cameras, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3428EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3428EDD#TRPBF belongs to Linear's high-efficiency DC/DC converter product line, engineered specifically for low-noise, high-current local voltage boosting in portable and space-constrained systems where thermal density and EMI are critical constraints.
FAQ
What is the minimum input voltage required for the LTC3428EDD#TRPBF to start switching?
The LTC3428EDD#TRPBF has a minimum startup voltage of 1.6V, as specified in the Electrical Characteristics table. Below this threshold, the device will not initiate switching even if SHDN is asserted. This enables reliable operation from partially discharged single-cell Li-ion batteries or low-voltage logic rails. The LTC3428EDD#TRPBF maintains regulation down to 1.6V input across its full temperature range.
Can the LTC3428EDD#TRPBF be used to generate 3.3V from a 1.8V input?
Yes, the LTC3428EDD#TRPBF supports 3.3V at 1.5A from a 1.8V input, as explicitly listed in the Applications section of the datasheet. Output voltage is set via the FB resistor divider using VOUT = 1.243V × (1 + R1/R2), allowing precise configuration for 3.3V or any value between 1.6V and 5.25V. The LTC3428EDD#TRPBF maintains high efficiency (>85%) in this configuration due to its low RDS(ON) switches and optimized control loop.
How does the dual-phase architecture of the LTC3428EDD#TRPBF reduce output capacitor requirements?
The LTC3428EDD#TRPBF's 180° interleaved phases halve the effective output ripple current magnitude, reducing peak-to-peak ripple from 4.34A (single-phase) to 0.64A at 2A load - an 85% reduction. This directly lowers RMS current stress on the output capacitor, permitting smaller ceramic values (e.g., 22μF instead of 100μF) and eliminating bulk electrolytics. The LTC3428EDD#TRPBF thus enables fully ceramic, low-profile, high-reliability output filtering.
What thermal management practices are recommended for the LTC3428EDD#TRPBF at full 2A load?
At full 2A load, the LTC3428EDD#TRPBF requires robust thermal design: the exposed pad must be soldered to a minimum 200mm² copper plane using ≥6 thermal vias (0.3mm diameter) to an inner ground layer. Ambient temperature must remain ≤85°C, and junction temperature should stay below 125°C (TJMAX). The LTC3428EDD#TRPBF includes thermal shutdown at ~150°C, but continuous operation above 125°C degrades reliability. Layout adherence to the datasheet's thermal pad guidelines is mandatory for sustained 2A output.
Is external compensation required for stable operation of the LTC3428EDD#TRPBF?
Yes, external compensation is required via the VC pin to ensure loop stability across all operating conditions. While the LTC3428EDD#TRPBF includes an internal 5pF capacitor, a series R-C network (e.g., 10kΩ + 470pF) from VC to AGND is necessary to place a dominant pole and zero that counteract the output filter pole and right-half-plane zero. The Typical Application schematic (Figure 3) shows a validated network; omitting or mis-sizing this network risks oscillation or poor transient response. The LTC3428EDD#TRPBF's loop dynamics depend critically on this external network.
LTC3428EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 1.6V
- 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#TRPBF FAQ
1.How can I place an order for LTC3428EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3428EDD#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 LTC3428EDD#TRPBF reliable?
The price and inventory of LTC3428EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3428EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3428EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3428EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3428EDD#TRPBF?
LTC3428EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3428EDD#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 LTC3428EDD#TRPBF?
For technical support, including LTC3428EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3428EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3428EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3428EDD#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 LTC3428EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3428EDD#TRPBF?
All LTC3428EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3428EDD#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 LTC3428EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3428EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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