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Analog Devices Inc. LTC3528BEDDB#TRPBF
- Part No.:
- LTC3528BEDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528BEDDB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
LTC3528BEDDB#TRPBF from Analog Devices (formerly Linear Technology) is a 1MHz synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 700mV, delivers up to 400mA at 3.3V from two alkaline/NiMH cells, features integrated soft-start, internal synchronous rectification, and operates down to 500mV once running - enabling extended runtime in portable medical instruments and wireless audio devices.
For engineers reviewing the LTC3528BEDDB#TRPBF datasheet, LTC3528BEDDB#TRPBF pinout, LTC3528BEDDB#TRPBF application, or LTC3528BEDDB#TRPBF equivalent, key selection criteria include its 700mV start-up voltage, 1.6V–5.25V adjustable output range, Burst Mode®-free continuous PWM operation (LTC3528B variant), 94% peak efficiency, and 8-lead 3mm × 2mm DFN package with exposed thermal pad.
Technical Context
The LTC3528BEDDB#TRPBF implements fixed-frequency current-mode PWM control with internal slope compensation and adaptive zero-current detection to maintain stability and optimize light-load efficiency. Its architecture integrates an N-channel MOSFET switch (175mΩ RDS(ON)) and P-channel synchronous rectifier (250mΩ RDS(ON)), enabling true output disconnect and eliminating body-diode conduction during shutdown.
Unlike the LTC3528, the LTC3528B variant avoids Burst Mode® operation entirely - instead maintaining continuous 1MHz switching across all load conditions, delivering low-noise regulated output ideal for noise-sensitive applications like Bluetooth headsets and flash-based MP3 players. Anti-ringing circuitry actively damps inductor resonance in discontinuous mode to suppress EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 700mV typical - enables operation from single depleted alkaline/NiMH cell without external boost. |
| Output Voltage Range | 1.6V to 5.25V - programmable via external resistor divider for flexible system rail generation. |
| Switching Frequency | 1MHz fixed - permits use of compact 2.2µH–4.7µH shielded inductors and low-profile ceramic capacitors. |
| Peak Efficiency | 94% - achieved at mid-load with 2.4V input to 3.3V/400mA output, minimizing thermal stress in space-constrained PCBs. |
| Quiescent Current (Active) | 300µA typical - supports long standby life in always-on portable electronics without compromising regulation. |
| Current Limit | 1.0A minimum - protects internal switches under overload or short-circuit while sustaining 400mA continuous output. |
| Thermal Shutdown | 160°C - safeguards die integrity during sustained high-power operation or poor heatsinking. |
Pinout & Package
Package: 8-lead 3mm × 2mm × 0.75mm plastic DFN (DDB) with exposed thermal pad (Pin 9), requiring soldering to PCB ground plane for thermal management (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled enable input | Pulled low (<0.25V) disables converter; internal 4MΩ pull-down ensures default shutdown on floating input. |
| FB (Pin 2) | Feedback reference node | Connects to resistor divider midpoint; regulates output via 1.200V ±30mV internal reference. |
| PGOOD (Pin 3) | Open-drain power-good flag | Asserts low when VFB drops >10% below regulation threshold - signals valid output to host controller. |
| VOUT (Pin 4) | Output voltage sense & sync rectifier drain | Serves as both regulated output node and connection point for internal P-MOSFET; requires short, wide trace to output capacitor. |
| SW (Pin 5) | Switch node | Connects to inductor; internal anti-ringing switch shorts SW to VIN during discontinuous conduction to suppress EMI. |
| PGND (Pin 6) | Power ground return | Dedicated path for high-current inductor and capacitor return - must be routed separately from SGND to minimize noise coupling. |
| SGND (Pin 7) | Signal ground reference | Reference for FB, SHDN, and PGOOD; requires direct low-impedance connection to input/output capacitor negatives. |
| VIN (Pin 8) | Battery input supply | Accepts 0.7V–5V input; requires ≥1µF ceramic decoupling capacitor placed adjacent to pin. |
| GND (Exposed Pad, Pin 9) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane - primary heat dissipation path and additional ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current flow during shutdown - prevents battery drain and enables safe forced-VOUT override. |
| Continuous 1MHz PWM (LTC3528B) | Delivers low-noise, ripple-controlled output without Burst Mode® artifacts - critical for analog audio and RF subsystems. |
| Integrated soft-start | Ramps peak inductor current from 0 to 1.5A over ~0.5ms - prevents inrush surges into heavy capacitive loads. |
| Anti-ringing control | Actively damps SW-node resonance during discontinuous mode - reduces radiated EMI without external snubbers. |
| Low-noise current-mode control | Internal slope compensation and zero-current detection ensure stable transient response with minimal output filtering. |
Applications
| Medical Instruments | Flash-Based MP3 Players |
|---|---|
Use Scenario: Portable glucose meters and handheld pulse oximeters powered by single AA/AAA cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V logic rail from 0.9–1.5V battery input during measurement cycles. Use Value: 700mV start-up and 500mV operating capability extend usable battery life by >30% versus conventional boost ICs. | Use Scenario: Compact flash-memory audio players with USB charging and battery backup. IC Role / Device Role / Timing Role: Supplies regulated 3.3V to NAND flash controller and audio DAC while maintaining low quiescent current in sleep mode. Use Value: Continuous 1MHz PWM eliminates audible switching noise in headphone output path - no Burst Mode® tone artifacts. |
| Noise Canceling Headphones | Wireless Mice |
Use Scenario: Battery-powered active noise cancellation (ANC) earbuds with real-time DSP processing. IC Role / Device Role / Timing Role: Powers 1.8V/3.3V rails for ANC algorithm processor and analog front-end amplifiers. Use Value: Output disconnect prevents battery leakage during storage; anti-ringing control meets Class B EMI limits for CE/FCC certification. | Use Scenario: Ultra-low-power optical mice using coin-cell batteries with multi-month operational life. IC Role / Device Role / Timing Role: Generates 3.3V for MCU and radio transceiver from 1.2V nominal input, entering low-IQ state between motion events. Use Value: 12µA Burst Mode® quiescent current (LTC3528) not applicable here - LTC3528B's 300µA active IQ is optimized for rapid wake-up responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 500mV start-up; 3.3V fixed output only; no output disconnect; 0.95MHz switching. | Lacks programmable VOUT and true disconnect - unsuitable for sequenced dual-rail or battery-isolation designs. | Select when fixed 3.3V output and lowest possible start-up voltage outweigh need for flexibility and safety features. |
| MAX17062ETA+ | 600mV start-up; 1.25V–5.5V adjustable output; includes I2C interface; 2.5MHz switching. | Higher frequency enables smaller passives but increases EMI sensitivity; I2C adds complexity for simple standalone use. | Choose when digital control, tighter output tolerance (±0.5%), or higher switching frequency justifies added cost and layout effort. |
Compared with TPS61200DRCT and MAX17062ETA+, the LTC3528BEDDB#TRPBF uniquely combines ultra-low 700mV start-up, full 1.6V–5.25V output adjustability, true output disconnect, and continuous low-noise PWM - making it optimal for space-constrained, battery-critical portable audio and medical devices where reliability and EMI compliance are non-negotiable.
Availability
LTC3528BEDDB#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, portable audio systems, and wireless human-interface devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3528BEDDB#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.
The LTC3528/LTC3528B family was engineered specifically for ultra-low-voltage, high-efficiency boost conversion in single- and dual-cell battery-powered portable electronics - emphasizing start-up robustness, EMI control, and seamless integration into compact PCB layouts.
FAQ
What is the key functional difference between LTC3528BEDDB#TRPBF and LTC3528EDDB#TRPBF?
The LTC3528BEDDB#TRPBF uses continuous 1MHz PWM operation across all load conditions, while the LTC3528EDDB#TRPBF enters Burst Mode® at light loads to achieve 12µA quiescent current. This makes the LTC3528BEDDB#TRPBF preferable for noise-sensitive applications like audio codecs or RF receivers where switching artifacts must be avoided. Both share identical pinout, package, and core specifications including 700mV start-up voltage and output disconnect.
Does LTC3528BEDDB#TRPBF support output voltages below 1.6V?
No. The LTC3528BEDDB#TRPBF has a minimum regulated output voltage of 1.6V, set by its internal 1.200V feedback reference and resistor-divider equation VOUT = 1.20V × (1 + R2/R1). Attempting to program below 1.6V violates the specified operating range and may result in unstable regulation or failure to reach target voltage. For sub-1.6V outputs, a different converter architecture is required.
How does the output disconnect feature of LTC3528BEDDB#TRPBF improve system safety?
The LTC3528BEDDB#TRPBF achieves true output disconnect by disabling the internal P-channel synchronous rectifier and preventing body-diode conduction - ensuring VOUT drops to 0V during shutdown and draws zero current from VIN. This eliminates battery drain during storage, enables safe hot-plug of external supplies, and prevents reverse current flow into a depleted battery, which is critical for medical and consumer devices with strict safety certifications.
Can LTC3528BEDDB#TRPBF operate with input voltage higher than output voltage?
Yes. The LTC3528BEDDB#TRPBF supports VIN > VOUT operation - maintaining regulation even when input exceeds programmed output (e.g., 4.2V Li-ion to 3.3V). However, efficiency drops significantly in this mode due to reduced duty cycle and increased conduction losses, and maximum output current is limited. Refer to the Typical Performance Characteristics graphs for derating curves under VIN > VOUT conditions.
What is the recommended minimum output capacitance for stable operation of LTC3528BEDDB#TRPBF?
The LTC3528BEDDB#TRPBF requires a minimum 10µF low-ESR ceramic output capacitor for stable internal loop compensation and acceptable transient response. Using less than 10µF risks instability, excessive output ripple, or failure to regulate under dynamic load steps. X5R or X7R dielectrics are preferred for stable capacitance across temperature and bias; Y5V types are not recommended due to severe voltage coefficient drift.
LTC3528BEDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 0.88V
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3528BEDDB#TRPBF FAQ
1.How can I place an order for LTC3528BEDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528BEDDB#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 LTC3528BEDDB#TRPBF reliable?
The price and inventory of LTC3528BEDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3528BEDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3528BEDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528BEDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528BEDDB#TRPBF?
LTC3528BEDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528BEDDB#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 LTC3528BEDDB#TRPBF?
For technical support, including LTC3528BEDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528BEDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3528BEDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528BEDDB#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 LTC3528BEDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3528BEDDB#TRPBF?
All LTC3528BEDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528BEDDB#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 LTC3528BEDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3528BEDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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