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Analog Devices Inc. LT3048EDC#TRPBF
- Part No.:
- LT3048EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3048EDC#TRPBF.pdf
- Description:
- IC REG DL BOOST/LINEAR 1MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
LT3048EDC#TRPBF from Analog Devices is an integrated low-noise bias generator combining a 1MHz boost regulator and a programmable LDO linear regulator in a single 8-lead 2mm × 2mm DFN package. It delivers up to 40mA output current with <500µVP-P output ripple and noise, 1.235V feedback voltage, and operates from 2.7V–4.8V input - ideal for sensor biasing and op amp supply in space-constrained portable instrumentation.
For engineers reviewing the LT3048EDC#TRPBF datasheet, LT3048EDC#TRPBF pinout, LT3048EDC#TRPBF application, or LT3048EDC#TRPBF equivalent, key selection criteria include its dual-stage architecture (boost + LDO), 1.1V BSTOUT-to-LDOOUT regulation offset, 1MHz fixed-frequency switching, integrated Schottky diode, and 0.1% load regulation - all critical for ultra-low-noise analog power design.
Technical Context
The LT3048EDC#TRPBF implements peak current-mode control in its boost stage, enabling predictable ripple, fast transient response, and stable operation with small inductors (e.g., 5.6µH). Its LDO input (LDOIN) is supplied by BSTOUT, regulated precisely 1.1V above LDOOUT to maximize PSRR and minimize dissipation during overload.
Feedback is referenced to a precision 1.235V internal bandgap, supporting adjustable output via external resistor divider. The device features load disconnect in shutdown (<1µA quiescent current), thermal shutdown, short-circuit protection, and BYP pin support for optional 1nF noise-reduction capacitor - directly optimizing spectral purity for sensitive analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 4.8V - compatible with single-cell Li-ion batteries without pre-regulation. |
| Output Current | Up to 40mA - sufficient for biasing high-precision op amps, ADCs, and MEMS sensors. |
| Output Noise | <120µVRMS (10Hz–100kHz) - enables clean supply for low-noise amplifiers and reference buffers. |
| Switching Frequency | 1MHz (fixed) - allows use of compact 5.6µH inductors and simplifies EMI filtering. |
| Feedback Voltage | 1.235V - sets output voltage accuracy and stability across temperature and load. |
| BSTOUT–LDOOUT Offset | 1.1V (typ) - optimizes LDO transient response and ripple rejection while limiting power loss. |
| Load Regulation | 0.1% - ensures stable output under varying sensor or amplifier load conditions. |
Pinout & Package
LT3048EDC#TRPBF is housed in an 8-lead 2mm × 2mm plastic DFN package with exposed pad (Pin 9) tied to GND. The package supports high thermal performance (θJA = 102°C/W) and requires soldering of the exposed pad to PCB ground for optimal electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Boost switch node | Anode of internal Schottky diode and collector of internal power transistor - forms high-frequency AC loop with BSTOUT capacitor. |
| VIN (Pin 2) | Boost regulator input | Supplies operating current to boost stage; must be bypassed to GND with low-ESR ceramic capacitor. |
| GND (Pin 3) | Ground reference | Primary ground return for boost and LDO stages; exposed pad (Pin 9) is electrically identical and must be soldered. |
| BYP (Pin 4) | Noise reduction terminal | Optional connection point for 1nF capacitor between LDOOUT and BYP to reduce output noise and soft-start LDO. |
| FB (Pin 5) | Feedback input | Regulated to 1.235V; connects to resistor divider tap to program output voltage - determines accuracy and stability. |
| LDOOUT (Pin 6) | LDO output | Programmable regulated output; requires ≥1µF low-ESR ceramic capacitor to ground for stability and transient response. |
| EN (Pin 7) | Enable control | Logic-high (>1.25V) enables both regulators; logic-low (<0.4V) shuts down entire device with <1µA quiescent current. |
| BSTOUT (Pin 8) | Boost regulator output | Supplies LDOIN; regulated 1.1V above LDOOUT - defines headroom for LDO operation and efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost + LDO architecture | Eliminates need for external DC/DC + LDO cascade, reducing BOM count and board area in bias supply designs. |
| 1.1V regulated BSTOUT–LDOOUT offset | Ensures optimal LDO PSRR and transient response while minimizing power dissipation during overloads. |
| 1MHz fixed-frequency operation | Enables consistent EMI profile and predictable inductor sizing - supports 5.6µH in most applications. |
| Integrated Schottky diode | Removes external diode requirement, improving reliability and reducing footprint in boost stage. |
| Load disconnect in shutdown | Prevents backfeed from LDOOUT to VIN during disable - critical for battery-powered systems with multiple rails. |
| 1.235V precision feedback reference | Supports tight output voltage tolerance (±1.5%) across temperature and load without trimming. |
Applications
| Sensor Bias Supply | High-Precision Op Amp Supply |
|---|---|
|
Use Scenario: Powering MEMS accelerometers, piezoresistive pressure sensors, or low-noise photodiode transimpedance amplifiers requiring stable, ultra-low-noise bias. IC Role / Device Role / Timing Role: Provides regulated, ripple-free bias voltage with <120µVRMS noise and 0.1% load regulation - directly setting sensor signal-to-noise ratio. Use Value: Enables sub-µV-level resolution in data acquisition systems without external filtering or post-regulation. |
Use Scenario: Supplying rail-to-rail input/output op amps in portable medical devices or test equipment where supply noise couples into signal path. IC Role / Device Role / Timing Role: Delivers clean ±15V or +15V/–5V split supplies (with companion device) with <500µVP-P ripple - preserving amplifier THD and dynamic range. Use Value: Reduces op amp output noise floor by >20dB compared to standard switching regulators, avoiding costly discrete LDO post-regulation. |
| Portable Instrumentation Power | Low-Power ADC Reference Buffer Supply |
|
Use Scenario: Generating precise analog supply rails in handheld multimeters, portable spectrum analyzers, or battery-operated calibration tools. IC Role / Device Role / Timing Role: Converts single-cell Li-ion (2.7V–4.8V) to stable 3.3V, 5V, or 12V outputs with 85% peak efficiency at 20mA - extending battery life. Use Value: Integrates boost and LDO functions in 4mm² footprint, eliminating discrete solutions that consume >12mm² and increase layout complexity. |
Use Scenario: Powering voltage reference buffers (e.g., REF50xx series) and SAR ADC analog front-ends where supply-induced code errors must be minimized. IC Role / Device Role / Timing Role: Supplies reference buffer with <120µVRMS noise and 1.235V FB accuracy - directly limiting INL/DNL error contribution from power rail. Use Value: Achieves <0.001% full-scale error budget allocation for power supply noise - meeting 24-bit ADC system requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise bias generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3048IDC#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C junction temperature (vs. E-grade –40°C to 125°C with guaranteed 0°C–125°C performance). | Required for industrial or automotive environments with extended temperature validation needs. | Select LT3048IDC#TRPBF when full –40°C to 125°C operation must be production-guaranteed per datasheet limits. |
| LT3095EDHC#TRPBF | Dual-channel version with independent 450kHz–2MHz programmable switching frequency, 4µVRMS noise, and 3mm × 5mm QFN-24 package. | Used when two independent low-noise bias rails (e.g., ±15V) are needed on one IC, accepting larger footprint and higher cost. | Choose LT3095EDHC#TRPBF only when dual-output capability justifies 3× board area increase and $2.50+ unit cost premium. |
Compared with LT3048IDC#TRPBF, the LT3048EDC#TRPBF offers identical functionality at lower qualification cost for commercial-temperature applications; versus LT3095EDHC#TRPBF, it provides single-rail simplicity and 60% smaller footprint where dual outputs are unnecessary.
Availability
LT3048EDC#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, sensor biasing, and high-precision op amp supply applications requiring stable component supply, long-term manufacturability, and traceable sourcing.
Supply support for LT3048EDC#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.
The LT3048EDC#TRPBF belongs to Analog Devices' µPower Low-Noise Bias Generator product line, designed specifically to replace multi-component discrete bias solutions in space- and noise-constrained analog signal chains.
FAQ
What is the maximum output current capability of the LT3048EDC#TRPBF?
The LT3048EDC#TRPBF delivers up to 40mA of continuous output current under typical conditions (VIN = 3.6V, LDOOUT = 1.235V). Output current capability decreases with higher output voltages - e.g., 24mA at 15V - due to power limitations of the integrated boost stage. Full derating curves are provided in the datasheet Figure 2.
Does the LT3048EDC#TRPBF require an external Schottky diode?
No, the LT3048EDC#TRPBF integrates a Schottky diode internally connected between BSTOUT and SW pins. This eliminates the need for an external diode, reducing component count, PCB area, and potential failure points - confirmed in the Pin Functions section (Page 8) and Block Diagram (Page 9).
How does the BYP pin function in the LT3048EDC#TRPBF?
The BYP pin on the LT3048EDC#TRPBF accepts an optional 1nF capacitor connected between LDOOUT and BYP to reduce output voltage noise and improve transient response. When used, it also provides soft-start behavior for the LDO stage. Leaving BYP unconnected maintains standard operation - details are specified in the Pin Functions (Page 8) and Applications Information (Page 11).
What is the purpose of the 1.1V BSTOUT-to-LDOOUT regulation offset in the LT3048EDC#TRPBF?
The 1.1V regulated offset between BSTOUT and LDOOUT in the LT3048EDC#TRPBF ensures optimal LDO headroom for high PSRR and fast transient response while minimizing power dissipation. This architecture dynamically adjusts BSTOUT to maintain constant dropout margin - critical for maintaining low noise during load transients and fault conditions.
Can the LT3048EDC#TRPBF be used with input voltages below 2.7V?
No - the absolute minimum input voltage for the LT3048EDC#TRPBF is 2.7V, as defined in the Absolute Maximum Ratings (Page 2) and Electrical Characteristics (Page 3). Operation below this threshold risks failure to start, unstable regulation, or violation of internal bias requirements. For sub-2.7V inputs, alternative solutions like the LT1613 or LT3464 should be evaluated.
LT3048EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Up (Boost) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 1MHz
- Voltage/Current - Output 1:
- 23.1V, 300mA
- Voltage/Current - Output 2:
- 1.235V ~ 22V, 45mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.7V ~ 4.8V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3048EDC#TRPBF FAQ
1.How can I place an order for LT3048EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3048EDC#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 LT3048EDC#TRPBF reliable?
The price and inventory of LT3048EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3048EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3048EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3048EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3048EDC#TRPBF?
LT3048EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3048EDC#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 LT3048EDC#TRPBF?
For technical support, including LT3048EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3048EDC#TRPBF requirements.
6.How does Aetrix verify that LT3048EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3048EDC#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 LT3048EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3048EDC#TRPBF?
All LT3048EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3048EDC#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 LT3048EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3048EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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