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Analog Devices Inc. LTC3528EDDB-2#TRMPBF
- Part No.:
- LTC3528EDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528EDDB-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:870
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Product details
Overview
LTC3528EDDB-2#TRMPBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency 2MHz step-up DC/DC converter with output disconnect and integrated N-channel/P-channel MOSFETs. It delivers up to 400mA at 3.3V from two alkaline/NiMH cells, starts from 700mV, operates down to 500mV input, and achieves up to 94% efficiency in portable medical and audio devices.
For engineers reviewing the LTC3528EDDB-2#TRMPBF datasheet, LTC3528EDDB-2#TRMPBF pinout, LTC3528EDDB-2#TRMPBF application, or LTC3528EDDB-2#TRMPBF equivalent, key selection criteria include its 0.5–5.5V input range, 1.6–5.25V adjustable output, Burst Mode® operation with 12µA quiescent current, internal soft-start, and DFN-8 (2mm × 3mm) package compatibility with space-constrained battery-powered designs.
Technical Context
The LTC3528EDDB-2#TRMPBF uses current-mode PWM control with internal slope compensation and adaptive zero-current detection to regulate output voltage across wide input/output differentials. Its architecture supports VIN > VOUT operation while maintaining regulation via duty-cycle clamping up to 92% and integrated anti-ringing circuitry to suppress EMI during discontinuous conduction mode.
Startup is enabled by a dedicated low-voltage oscillator that activates at 700mV (typ), after which the IC transitions to self-biasing from VOUT once VOUT exceeds VIN by 240mV. Output disconnect is implemented by disabling the P-channel synchronous rectifier body diode path during shutdown, ensuring true 0V VOUT and eliminating reverse leakage into the input source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 0.5V to 5.5V - supports single-cell alkaline/NiMH (0.9–1.6V) and dual-cell (1.8–3.2V) operation without external biasing |
| Start-Up Voltage | 700mV (typ) - enables power-up from deeply discharged batteries before normal regulation begins |
| VOUT Range | 1.6V to 5.25V - programmable via external resistor divider; 3.3V output validated at 400mA from two cells |
| Switching Frequency | 2MHz (±20%) - allows use of sub-3mm ceramic inductors (e.g., 2.2µH) and minimizes solution footprint |
| Efficiency | Up to 94% - achieved at mid-load with synchronous rectification and low RDS(ON) (0.175Ω NMOS / 0.25Ω PMOS) |
| Quiescent Current | 12µA in Burst Mode - extends battery life in standby; <1µA shutdown current isolates input during off-state |
| Output Disconnect | True 0V VOUT during shutdown - prevents backfeed, enables inrush limiting, and supports sequencing in multi-rail systems |
Pinout & Package
The LTC3528EDDB-2#TRMPBF is housed in an 8-lead, 2mm × 3mm × 0.75mm plastic DFN package (DDB) with exposed thermal pad (Pin 9) requiring solder connection to PCB ground plane for thermal management and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled enable input | Pulled low (<0.25V) disables switching and reduces IQ to <1µA; internal 4MΩ pull-down ensures default-off state |
| FB (Pin 2) | Feedback voltage sense node | Compares divided VOUT against 1.20V reference; sets output via R1/R2 divider per VOUT = 1.20V × (1 + R2/R1) |
| PGOOD (Pin 3) | Open-drain power-good flag | Asserts low when VFB falls >10% below regulation threshold; requires external pull-up for system monitoring |
| VOUT (Pin 4) | Regulated output & synchronous rectifier drain | Connects directly to output capacitor; short, wide trace required to minimize ESR-induced ripple and load transient errors |
| SW (Pin 5) | Switch node | Drives external inductor; internal anti-ringing switch connects SW to VIN during DCM to damp LC resonance |
| PGND (Pin 6) | Power ground return | Carries high-frequency inductor current; must tie directly to (–) terminals of input/output capacitors |
| SGND (Pin 7) | Signal ground reference | Provides low-noise reference for FB, PGOOD, and error amplifier; separate from PGND but tied at single point |
| VIN (Pin 8) | Main input supply | Accepts battery or rail input; requires ≥1µF ceramic decoupling placed adjacent to pin |
| GND (Exposed Pad, Pin 9) | Thermal & electrical ground | Must be soldered to PCB ground plane; failure to do so raises θJA from 76°C/W to >150°C/W, risking thermal shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode losses; enables >90% efficiency at light-to-moderate loads with no external components |
| Burst Mode® Operation | Reduces quiescent current to 12µA while maintaining regulation; minimizes battery drain in intermittent-use applications like wireless peripherals |
| True Output Disconnect | Prevents VOUT from floating or back-feeding during shutdown; critical for safe sequencing and isolation in multi-supply systems |
| Internal Soft-Start | Ramps peak inductor current over ~0.5ms to limit inrush; avoids input voltage sag and protects upstream battery or regulator |
| Anti-Ringing Control | Damps SW-node oscillation during discontinuous mode using internal switch; reduces EMI without external snubbers or ferrite beads |
| Low-Voltage Startup Oscillator | Operates independently at VIN ≥700mV; enables reliable boot from weak or aging primary cells before main regulator engages |
Applications
| Medical Instruments | Noise Canceling Headphones |
|---|---|
Use Scenario: Portable blood glucose meters powered by single AAA alkaline cell requiring stable 3.3V rail for MCU and sensor interface. IC Role / Device Role / Timing Role: Step-up converter providing regulated 3.3V output with output disconnect to prevent battery drain during sleep mode. Use Value: 700mV startup and 12µA Burst Mode current extend usable battery life by >30% versus non-synchronous alternatives. | Use Scenario: Battery-powered active noise cancellation (ANC) headphones drawing bursty 200mA loads from single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: High-efficiency boost regulator delivering 5V for analog signal chain and DAC, with fast transient response to ANC processing spikes. Use Value: 2MHz switching and internal compensation enable compact layout with minimal output capacitance (10µF ceramic), reducing BOM cost and board area. |
| Wireless Mice | Bluetooth Headsets |
Use Scenario: Ultra-low-power optical mouse using dual NiMH cells (1.8–3.2V) to generate 3.3V for RF transceiver and motion processor. IC Role / Device Role / Timing Role: Fixed-frequency boost converter with logic-controlled shutdown and PGOOD signaling for host MCU power management. Use Value: Output disconnect ensures zero standby current; PGOOD enables firmware to verify rail stability before enabling radio subsystem. | Use Scenario: Compact Bluetooth headset requiring 3.3V from single alkaline cell (0.9–1.6V) with tight ripple tolerance for audio codec. IC Role / Device Role / Timing Role: Low-noise, high-PWM-frequency boost regulator supplying clean 3.3V with <1% ripple in Burst Mode for analog audio stages. Use Value: Anti-ringing control and fixed 2MHz frequency minimize conducted EMI near sensitive RF receivers, improving link robustness. |
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 | Lower 0.3V start-up (vs 0.7V); 0.9–5.5V input; no output disconnect; 1.2MHz switching | Lacks true output disconnect and Burst Mode; higher quiescent current (50µA vs 12µA) limits ultra-low-power use | Preferred where lowest possible start-up voltage is critical and output isolation is not required |
| MAX17222ETA+ | 0.4V start-up; 0.4–5.5V input; 1.2MHz; integrated soft-start; no PGOOD or output disconnect | Missing PGOOD flag and output disconnect; lower switching frequency increases inductor size and limits transient response | Suitable for cost-sensitive, space-tolerant applications where sequencing and rail monitoring are unnecessary |
Compared with TPS61200DRCT and MAX17222ETA+, the LTC3528EDDB-2#TRMPBF uniquely combines sub-1V startup, true output disconnect, PGOOD signaling, and 2MHz operation-enabling smaller magnetics, longer battery life, and safer multi-rail sequencing in portable medical and audio designs.
Availability
LTC3528EDDB-2#TRMPBF is available at Aetrix Electronics and suitable for portable medical instruments, noise-canceling headphones, wireless mice, Bluetooth headsets, and other battery-powered consumer electronics requiring stable component supply with long-term lifecycle support.
Supply support for LTC3528EDDB-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3528EDDB-2#TRMPBF belongs to ADI's Power Management product line, designed specifically for ultra-low-voltage, high-efficiency DC/DC conversion in space- and battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for the LTC3528EDDB-2#TRMPBF to start switching?
The LTC3528EDDB-2#TRMPBF features a dedicated low-voltage startup oscillator that initiates operation at 700mV (typical), allowing it to power up from nearly depleted single-cell alkaline or NiMH batteries. Once started, it continues regulating down to 500mV input. This capability is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and validated in Typical Performance Characteristic Figure G17 (Start-Up Voltage vs Temperature).
Does the LTC3528EDDB-2#TRMPBF support output voltages higher than the input voltage?
Yes, the LTC3528EDDB-2#TRMPBF is explicitly designed as a step-up (boost) converter and supports VIN > VOUT operation per the Applications Information section. In this mode, regulation is maintained via duty-cycle reduction, though efficiency drops significantly and maximum output current is reduced. The device does not require external components to enable this behavior-it is inherent to its synchronous boost architecture.
How does the output disconnect feature work in the LTC3528EDDB-2#TRMPBF?
The LTC3528EDDB-2#TRMPBF implements true output disconnect by disabling the P-channel MOSFET synchronous rectifier's body diode path during shutdown. When SHDN is pulled low, the internal gate drive to the PMOS is removed, preventing reverse current flow from VOUT to VIN. This ensures VOUT collapses to 0V and draws no current from the input source-verified in the Description and Applications Information sections and critical for multi-rail sequencing safety.
What is the purpose of the exposed pad (Pin 9) on the LTC3528EDDB-2#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC3528EDDB-2#TRMPBF serves as both a thermal dissipation path and a low-impedance ground connection. Per the Package Description and Note 6, it must be soldered to the PCB ground plane; failure to do so raises thermal resistance from 76°C/W to >150°C/W, risking premature thermal shutdown under load. It is electrically connected to GND and forms part of the thermal and electrical reference for internal circuitry.
Can the LTC3528EDDB-2#TRMPBF operate in Burst Mode with a 5V output?
Yes, the LTC3528EDDB-2#TRMPBF enters Burst Mode at light loads regardless of output voltage setting, including 5V. However, the Burst Mode entry threshold varies with VIN and VOUT-per Typical Performance Characteristic Figures G08–G11, single-cell-to-5V operation below VIN = 1.5V may inhibit Burst Mode due to high inductor slew rate. For guaranteed Burst Mode across full input range at 5V, a higher-inductance value (e.g., 3.3µH) is recommended per the Applications Information section.
LTC3528EDDB-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)
LTC3528EDDB-2#TRMPBF FAQ
1.How can I place an order for LTC3528EDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528EDDB-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 LTC3528EDDB-2#TRMPBF reliable?
The price and inventory of LTC3528EDDB-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 LTC3528EDDB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3528EDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528EDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528EDDB-2#TRMPBF?
LTC3528EDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528EDDB-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 LTC3528EDDB-2#TRMPBF?
For technical support, including LTC3528EDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528EDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3528EDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528EDDB-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 LTC3528EDDB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3528EDDB-2#TRMPBF?
All LTC3528EDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528EDDB-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 LTC3528EDDB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3528EDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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