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Analog Devices Inc. LTC3528BEDDB-2#TRMPBF
- Part No.:
- LTC3528BEDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528BEDDB-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,402
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Product details
Overview
LTC3528BEDDB-2#TRMPBF from Analog Devices (formerly Linear Technology) is a 2MHz synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It delivers up to 400mA at 3.3V from two alkaline/NiMH cells (1.8–3.2V input), features 700mV start-up voltage, 1.6–5.25V adjustable output, and integrated soft-start - enabling reliable power delivery in compact portable electronics.
For engineers reviewing the LTC3528BEDDB-2#TRMPBF datasheet, LTC3528BEDDB-2#TRMPBF pinout, LTC3528BEDDB-2#TRMPBF application, or LTC3528BEDDB-2#TRMPBF equivalent, key selection considerations include its 2MHz fixed-frequency current-mode control, true output disconnect capability, anti-ringing circuitry for EMI reduction, and operation down to 500mV post-startup - critical for single-cell energy harvesting and low-power wearables.
Technical Context
The LTC3528BEDDB-2#TRMPBF employs a current-mode PWM architecture with internal slope compensation and adaptive zero-current detection, enabling fast transient response and stable regulation across wide input/output ranges. Its dual-MOSFET synchronous rectifier (N-channel switch + P-channel rectifier) supports VIN-to-VOUT step-up, buck-boost crossover, and true output disconnect by eliminating body-diode conduction during shutdown.
Startup is managed by an independent oscillator that activates at 700mV (typ), then transitions to main 2MHz oscillator once VOUT exceeds VIN by 240mV. Internal soft-start ramps peak inductor current to 1.5A over ~500µs, while anti-ringing control connects SW to VIN in discontinuous mode to suppress high-frequency ringing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.0 MHz (typ) - enables use of sub-3mm ceramic inductors and reduces solution footprint |
| Start-Up Voltage | 0.70 V (min) - powers on from single depleted alkaline/NiMH cell or energy-harvesting sources |
| Input Voltage Range | 0.50 V to 5.5 V - supports operation below start-up voltage after initialization |
| Output Voltage Range | 1.6 V to 5.25 V (adjustable via FB divider) - covers common logic rails including 1.8V, 3.3V, and 5V |
| Peak Switch Current Limit | 1.5 A (typ) - sets maximum inductor current and defines output capability under load |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) (0.175Ω NMOS / 0.250Ω PMOS) |
| Shutdown Quiescent Current | <1 µA - preserves battery life in standby mode with logic-controlled SHDN pin |
| Thermal Shutdown Threshold | 160°C (junction) - protects against sustained overload or poor PCB thermal design |
Pinout & Package
Package: 8-lead 3mm × 2mm × 0.75mm DFN (DDB) with exposed GND pad (Pin 9), RoHS-compliant, tape-and-reel (TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled enable input | Pull ≥0.88V for operation; ≤0.25V for shutdown (<1µA IQ); internal 4MΩ pull-down |
| FB (Pin 2) | Feedback voltage sense node | Connects to resistor divider; regulates VOUT = 1.20V × (1 + R2/R1); 1.200V reference (±2.5%) |
| PGOOD (Pin 3) | Open-drain power-good flag | Asserts low when VFB falls >10% below regulation threshold; requires external pull-up |
| VOUT (Pin 4) | Regulated output & rectifier drain | Provides output voltage and serves as drain connection for internal P-channel MOSFET |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt switching current; anti-ringing switch ties to VIN in DCM |
| PGND (Pin 6) | Power ground return | Low-impedance path for input/output capacitor negative terminals and high-current return |
| SGND (Pin 7) | Signal ground reference | Separate ground for FB, PGOOD, and SHDN to minimize noise coupling into error amplifier |
| VIN (Pin 8) | Battery input supply | Accepts 0.5–5.5V; requires ≥1µF ceramic decoupling close to pin; powers IC pre-VOUT takeover |
| GND (Exposed Pad, Pin 9) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; provides primary thermal path (θJA = 76°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | Eliminates P-channel body diode conduction during shutdown - VOUT drops to 0V with no reverse current into VIN source |
| Anti-Ringing Control | Internally connects SW to VIN during discontinuous conduction mode - suppresses high-frequency ringing without external snubber |
| Continuous PWM at Light Loads | Maintains 2MHz switching down to ~1mA load - avoids audible noise and ensures predictable EMI profile |
| Integrated Soft-Start | Ramps peak inductor current from 0 to 1.5A over ~500µs - prevents inrush into large output capacitors |
| Internal Compensation | Current-mode loop compensation embedded - eliminates need for external compensation network |
| Low-Noise Fixed-Frequency Operation | 2MHz constant frequency with minimal output ripple - simplifies EMI filtering vs. variable-frequency alternatives |
Applications
| Medical Wearables | Noise-Canceling Headphones |
|---|---|
Use Scenario: Powering ultra-low-power biosensor front-ends and Bluetooth LE transceivers from a single AA/AAA cell. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail with <1µA shutdown current and 700mV start-up capability. Use Value: Extends battery life beyond 12 months in intermittent-sensing modes while enabling rapid wake-up from deep sleep. |
Use Scenario: Supplying analog audio amplifiers and active noise cancellation circuits from two NiMH cells. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 3.3V/400mA with low-noise 2MHz switching to avoid interference with audio band. Use Value: Achieves >92% efficiency at 200mA load, minimizing heat generation near earcup and preserving runtime during continuous ANC operation. |
| Wireless Mice & Keyboards | Flash-Based MP3 Players |
Use Scenario: Generating regulated 3.3V from one or two alkaline cells in compact HID peripherals. IC Role / Device Role / Timing Role: Synchronous boost converter with output disconnect, enabling zero-load current draw during RF sleep states. Use Value: Reduces average system current to <100nA in deep-sleep mode - critical for multi-year battery life in premium wireless mice. |
Use Scenario: Powering NAND flash memory, audio DAC, and microcontroller from single alkaline cell in portable media players. IC Role / Device Role / Timing Role: Adjustable-output boost IC delivering 1.8V or 3.3V with soft-start to prevent brown-out during flash write cycles. Use Value: Supports 1.8V I/O for low-power flash and 3.3V analog section simultaneously via sequencing-capable design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3422 | 3MHz switching, 1.5A switch, 3mm × 3mm DFN10 package, same 0.85V start-up | Higher frequency allows smaller inductors but increases switching loss above 200mA; no anti-ringing circuit | Prefer for space-constrained designs needing >300mA at 5V; verify thermal performance with exposed pad layout |
| LTC3528B-1 | 1MHz version (vs. 2MHz), identical pinout and features, lower EMI but larger magnetics required | Better efficiency at medium loads (>100mA); less suitable for ultra-thin profiles requiring sub-2mm height inductors | Select when board area is less constrained than height, or when EMI filtering simplicity outweighs size penalty |
Compared with LTC3422 and LTC3528B-1, the LTC3528BEDDB-2#TRMPBF uniquely balances 2MHz operation for miniaturization, anti-ringing EMI suppression, and true output disconnect - making it optimal for thin, battery-sensitive consumer devices where startup reliability and zero-load leakage are non-negotiable.
Availability
LTC3528BEDDB-2#TRMPBF is available at Aetrix Electronics and suitable for medical wearables, noise-canceling headphones, wireless HID peripherals, and flash-based portable audio requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3528BEDDB-2#TRMPBF 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 full technical and manufacturing continuity for all Linear power products. Linear pioneered high-performance analog ICs with emphasis on precision, efficiency, and integration.
The LTC3528B family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing single-cell compatibility, output disconnect, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC3528BEDDB-2#TRMPBF to start up?
The LTC3528BEDDB-2#TRMPBF has a guaranteed minimum start-up voltage of 0.70V (typical 0.70V, max 0.88V per datasheet). It uses a dedicated start-up oscillator to initiate operation from a single depleted alkaline or NiMH cell. Once started, it continues operating down to 0.50V input, provided sufficient power can be delivered to sustain the load.
Does the LTC3528BEDDB-2#TRMPBF support output voltages higher than the input voltage?
Yes, the LTC3528BEDDB-2#TRMPBF is a synchronous step-up (boost) converter and inherently supports VOUT > VIN. It also tolerates VIN > VOUT (buck-boost crossover mode), though efficiency drops significantly in that region. The device regulates output across its full 1.6V–5.25V range regardless of input level, as confirmed in the "VIN > VOUT Operation" section of the datasheet.
How does the output disconnect feature work in the LTC3528BEDDB-2#TRMPBF?
The LTC3528BEDDB-2#TRMPBF achieves true output disconnect by disabling the internal P-channel MOSFET rectifier during shutdown and preventing its body diode from conducting. When SHDN is pulled low, VOUT discharges to 0V with no reverse current flow into VIN - unlike conventional boost converters. This eliminates battery drain during storage and enables safe inrush limiting at turn-on.
Can the LTC3528BEDDB-2#TRMPBF be used with ceramic output capacitors?
Yes, the LTC3528BEDDB-2#TRMPBF is internally compensated for stability with ≥10µF ceramic output capacitors (X5R/X7R dielectrics recommended). Its control loop is optimized for low-ESR ceramics, and typical applications use 10µF–22µF MLCCs. Tantalum capacitors may also be used, but ceramic is preferred for size, reliability, and transient response.
What is the purpose of the anti-ringing control in the LTC3528BEDDB-2#TRMPBF?
The anti-ringing control in the LTC3528BEDDB-2#TRMPBF connects an internal switch between SW and VIN during discontinuous conduction mode to dampen high-frequency LC ringing caused by inductor parasitic capacitance. This reduces radiated EMI without requiring external snubbers or ferrite beads - simplifying layout and improving EMC compliance in compact portable designs.
LTC3528BEDDB-2#TRMPBF 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3528BEDDB-2#TRMPBF FAQ
1.How can I place an order for LTC3528BEDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528BEDDB-2#TRMPBF 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-2#TRMPBF reliable?
The price and inventory of LTC3528BEDDB-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3528BEDDB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3528BEDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528BEDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528BEDDB-2#TRMPBF?
LTC3528BEDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528BEDDB-2#TRMPBF 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-2#TRMPBF?
For technical support, including LTC3528BEDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528BEDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3528BEDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528BEDDB-2#TRMPBF 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-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3528BEDDB-2#TRMPBF?
All LTC3528BEDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528BEDDB-2#TRMPBF, 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-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3528BEDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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