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Analog Devices Inc. LTC3528EDDB#TRMPBF
- Part No.:
- LTC3528EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528EDDB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
LTC3528EDDB#TRMPBF 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 0.70V, delivers up to 400mA at 3.3V from two alkaline/NiMH cells, features integrated soft-start and internal compensation, and operates in Burst Mode® with 12µA quiescent current - ideal for portable medical instruments and Bluetooth headsets.
For engineers reviewing the LTC3528EDDB#TRMPBF datasheet, LTC3528EDDB#TRMPBF pinout, LTC3528EDDB#TRMPBF application, or LTC3528EDDB#TRMPBF equivalent, key selection criteria include verified 700mV start-up voltage, confirmed 1.6V–5.25V adjustable output range, validated 94% peak efficiency at 400mA, and confirmed 8-lead 3mm × 2mm DFN package with exposed thermal pad.
Technical Context
The LTC3528EDDB#TRMPBF implements fixed-frequency (1MHz) current-mode PWM control with adaptive slope compensation, enabling fast transient response and stable operation without external loop compensation. Its architecture integrates an N-channel MOSFET switch (175mΩ RDS(ON)) and P-channel synchronous rectifier, with zero-current detection to disable the rectifier below ~20mA, minimizing reverse conduction losses.
Burst Mode® operation is automatically engaged below load-dependent thresholds (e.g., ~10mA at VIN = 1.2V, VOUT = 3.3V), reducing quiescent current to 12µA while maintaining regulation via periodic energy bursts. Output disconnect is achieved by disabling the P-channel rectifier body diode path during shutdown, ensuring true VOUT = 0V and eliminating input source drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.70V typical - enables operation from single depleted alkaline/NiMH cell before cutoff. |
| 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 2.2–4.7µH shielded inductors and low-ESR ceramic capacitors. |
| Peak Efficiency | 94% at VIN = 2.4V, VOUT = 3.3V, IOUT = 400mA - minimizes thermal stress and extends battery runtime. |
| Quiescent Current (Burst) | 12µA - sustains >100-hour standby in always-on wearable sensors without significant battery depletion. |
| Current Limit | 1.5A typical - supports high-pulse loads (e.g., flash LED ignition) without foldback or latch-off. |
| Thermal Shutdown | 160°C junction - protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-lead 3mm × 2mm × 0.75mm plastic DFN with exposed thermal pad (Pin 9), requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled enable input | Pulled low (<0.25V) disables switching and reduces supply current to <1µA; internal 4MΩ pull-down ensures default shutdown. |
| FB (Pin 2) | Feedback node for output regulation | Connects to resistor divider midpoint; internal 1.200V reference sets VOUT = 1.20V × (1 + R2/R1). |
| PGOOD (Pin 3) | Open-drain power-good indicator | Sinks current when VFB falls >10% below regulation threshold - used for system sequencing or fault monitoring. |
| VOUT (Pin 4) | Regulated output and synchronous rectifier drain | Must connect directly to output capacitor (≥10µF); serves as return path for internal P-MOSFET. |
| SW (Pin 5) | Switch node | Drives external inductor; internal anti-ringing switch connects SW to VIN during discontinuous mode to suppress EMI. |
| PGND (Pin 6) | Power ground return | Low-impedance path for high di/dt currents from input/output capacitors and inductor. |
| SGND (Pin 7) | Signal ground reference | Separate ground for FB, PGOOD, and SHDN to avoid noise coupling into error amplifier. |
| VIN (Pin 8) | Input supply connection | Accepts 0.5V–5V; requires ≥1µF ceramic decoupling placed adjacent to pin. |
| GND (Exposed Pad) | Thermal and electrical ground | Must be soldered to large PCB copper area; failure to do so raises θJA beyond 76°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Start-Up Voltage | 0.70V enables use with single-cell alkaline/NiMH batteries down to end-of-life (~0.8V), extending usable battery capacity. |
| True Output Disconnect | Eliminates body-diode leakage path during shutdown, allowing VOUT to fully discharge and preventing reverse current into weak input sources. |
| Integrated Soft-Start | Ramps peak inductor current from 0 to 1.5A over ~0.5ms, preventing inrush surges into heavy capacitive loads. |
| Anti-Ringing Control | Internally damps SW-node resonance during discontinuous conduction mode, reducing radiated EMI without external snubbers. |
| Internal Compensation | Removes need for external compensation network - simplifies layout and reduces BOM count for space-constrained portable designs. |
Applications
| Medical Instrument Power | Noise-Canceling Headphones |
|---|---|
Use Scenario: Portable glucose meters and pulse oximeters powered by single AA/AAA alkaline cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V rail from 0.9–1.5V input, enabling MCU and sensor operation across full battery discharge curve. Use Value: 0.70V start-up and Burst Mode® extend usable battery life by >30% compared to conventional boost converters. | Use Scenario: Active noise-canceling circuitry in compact wireless headphones requiring low-noise, low-quiescent-power 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying analog front-end and DSP core, operating in Burst Mode® during audio pause intervals. Use Value: 12µA quiescent current enables multi-week standby without recharge, while 1MHz switching avoids audible beat frequencies. |
| Bluetooth Headset Transceiver | Flash-Based MP3 Player |
Use Scenario: Miniature Bluetooth voice headsets with tight PCB area constraints and dual-cell NiMH power. IC Role / Device Role / Timing Role: Generates 3.3V for RF transceiver and 1.8V for baseband processor from 2.4V nominal input, supporting dynamic load steps. Use Value: Current-mode control and zero-current detection deliver <50µs load transient recovery, preventing RF packet loss during voice bursts. | Use Scenario: Low-cost flash-memory MP3 players using single alkaline cell with aggressive cost and size targets. IC Role / Device Role / Timing Role: Single-chip boost solution delivering 3.3V at 200mA for NAND controller and audio DAC, replacing discrete inductor+diode designs. Use Value: Integrated synchronous rectifier and 94% efficiency reduce heat generation in sealed plastic enclosures, avoiding thermal derating. |
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 | 0.3V start-up, 0.9–5.5V output, 1.2MHz, no output disconnect, 2.5µA quiescent current in shutdown | Superior for ultra-low-VIN applications but lacks true output disconnect and Burst Mode® regulation stability | Select when minimum input voltage is <0.7V and output disconnect is not required. |
| MAX17062ETA+ | 0.7V start-up, 2.5–5.5V output, 1MHz, integrated soft-start, 22µA quiescent current in skip mode | Higher quiescent current and no anti-ringing control; rated only to 85°C ambient | Select for cost-sensitive industrial designs where extended temperature range is not critical. |
Compared with TPS61200DRCT and MAX17062ETA+, the LTC3528EDDB#TRMPBF uniquely combines verified 0.70V start-up, true output disconnect, and Burst Mode® regulation with 12µA quiescent current - making it optimal for battery-powered portable devices requiring long standby life and clean shutdown behavior.
Availability
LTC3528EDDB#TRMPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling audio systems, Bluetooth headsets, and flash-based portable media players requiring stable component supply and guaranteed long-term availability.
Supply support for LTC3528EDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3528EDDB#TRMPBF belongs to Linear's precision micropower DC/DC converter product line, engineered specifically for ultra-low-voltage, battery-critical portable electronics where start-up capability, efficiency, and shutdown integrity are non-negotiable.
FAQ
What is the minimum input voltage required for LTC3528EDDB#TRMPBF to start up and regulate?
The LTC3528EDDB#TRMPBF has a typical start-up voltage of 0.70V and guarantees operation down to 0.5V once started. This allows reliable boot from deeply discharged single alkaline or NiMH cells. The device uses an independent start-up oscillator and internal charge pump to initiate regulation without external assistance, and enters normal operation when either VIN or VOUT exceeds 1.6V.
Does LTC3528EDDB#TRMPBF support output voltages higher than the input voltage?
Yes, LTC3528EDDB#TRMPBF is a step-up (boost) converter and inherently supports VOUT > VIN. It also tolerates VIN > VOUT operation - maintaining regulation even when input exceeds programmed output - though efficiency drops significantly and maximum output current is reduced. This feature enables robustness in variable-source applications like multi-cell battery packs.
How does the output disconnect feature work in LTC3528EDDB#TRMPBF, and why is it important?
The LTC3528EDDB#TRMPBF achieves true output disconnect by disabling the internal P-channel synchronous rectifier's body diode path during shutdown. This prevents reverse current flow from VOUT to VIN, allowing VOUT to fully discharge to 0V and eliminating battery drain. It also enables safe inrush limiting and supports forced VOUT override - critical for systems requiring clean power sequencing or backup battery isolation.
What is the purpose of the anti-ringing control in LTC3528EDDB#TRMPBF?
The anti-ringing control in LTC3528EDDB#TRMPBF activates an internal switch between SW and VIN during discontinuous conduction mode to damp the LC resonance formed by the inductor and SW-node capacitance. This suppresses high-frequency ringing (typically >50MHz), reducing radiated EMI without requiring external snubber networks - simplifying layout and improving EMC compliance in compact portable designs.
Can LTC3528EDDB#TRMPBF be used with lithium-ion input sources?
Yes, LTC3528EDDB#TRMPBF supports lithium-ion inputs (2.7V–4.2V) and is commonly used to generate 5V rails in Li-ion-powered devices such as portable speakers and wireless headsets. Its 6V absolute maximum VIN rating, 1.6V–5.25V output adjust range, and continuous 1MHz operation ensure compatibility. Typical efficiency reaches 92% at 400mA output when stepping 3.6V to 5V.
LTC3528EDDB#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):
- 5.25V
- 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)
LTC3528EDDB#TRMPBF FAQ
1.How can I place an order for LTC3528EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528EDDB#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 LTC3528EDDB#TRMPBF reliable?
The price and inventory of LTC3528EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3528EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3528EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528EDDB#TRMPBF?
LTC3528EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528EDDB#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 LTC3528EDDB#TRMPBF?
For technical support, including LTC3528EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3528EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528EDDB#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 LTC3528EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3528EDDB#TRMPBF?
All LTC3528EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528EDDB#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 LTC3528EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3528EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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