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Analog Devices Inc. LT3048IDC-3.3#TRPBF
- Part No.:
- LT3048IDC-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3048IDC-3.3#TRPBF.pdf
- Description:
- IC REG DL BOOST/LNR 2.2MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
LT3048IDC-3.3#TRPBF from Analog Devices is a dual-stage low-noise bias generator integrating a 2.2MHz fixed-frequency boost regulator and a low-dropout linear regulator in an 8-lead 2mm × 2mm DFN package. It delivers a precise 3.3V output at up to 40mA from 2.7V–4.8V input, achieves <120µVRMS (10Hz–100kHz) noise with 1nF BYP capacitor, and targets sensor biasing and op amp supply in space-constrained portable instrumentation.
For engineers reviewing the LT3048IDC-3.3#TRPBF datasheet, LT3048IDC-3.3#TRPBF pinout, LT3048IDC-3.3#TRPBF application, or LT3048IDC-3.3#TRPBF equivalent, key selection criteria include guaranteed 3.300V ±0.05V output accuracy over –40°C to 125°C, integrated Schottky diode, load disconnect in shutdown, and BSTOUT regulation to LDOOUT + 1.1V for optimized ripple rejection.
Technical Context
The LT3048IDC-3.3#TRPBF employs peak current-mode control in its boost stage for predictable ripple and fast transient response, with switching frequency fixed at 2.2MHz (typical) across temperature. Its LDO stage regulates using a precision 1.235V internal reference and achieves <18mV load regulation (100µA–40mA), enabled by BSTOUT being actively regulated 1.1V above LDOOUT.
This architecture decouples switching noise via high PSRR LDO filtering while maintaining efficiency: the boost output voltage dynamically tracks the LDO input requirement, minimizing power dissipation in the pass element during overload or low-input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±0.05V (guaranteed over full –40°C to 125°C junction range) |
| Output Current | Up to 40mA continuous; supports stable operation under full load without thermal shutdown |
| Voltage Noise | 120µVRMS (10Hz–100kHz, CBYP = 1nF); enables ultra-low-noise analog signal chains |
| Switching Frequency | 2.2MHz typical; allows use of compact 3.3µH inductor and reduces EMI fundamental frequency |
| Ripple Rejection | 60dB at 1MHz; suppresses boost switching artifacts before final LDO output |
| Load Regulation | 9mV max (100µA to 40mA); ensures stable bias voltage across varying sensor or amplifier loads |
| Quiescent Current | 20µA typical (LDO stage); maintains low system standby power |
Pinout & Package
LT3048IDC-3.3#TRPBF is housed in an 8-lead plastic DFN package (2mm × 2mm, 0.75mm height) with exposed thermal pad (Pin 9) that must be soldered to PCB ground for thermal and electrical integrity. Pin pitch is 0.45mm; package meets JEDEC MO-229 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Boost switch node | Collector of internal NPN transistor; connects to inductor and internal Schottky anode; requires minimal loop area for EMI control |
| VIN (Pin 2) | Input supply | Primary input for boost regulator; must be bypassed to GND with low-ESR ceramic capacitor |
| GND (Pin 3) | Ground reference | Signal and power ground return; tied directly to exposed pad (Pin 9) for lowest impedance path |
| BYP (Pin 4) | Noise reduction terminal | Accepts optional 1nF capacitor to LDOOUT to reduce output noise and provide soft-start |
| LDOOUT (Pin 5) | Regulated output | Fixed 3.3V output; requires ≥1µF low-ESR ceramic capacitor to ground for stability and transient response |
| LDOIN (Pin 6) | LDO input | Supplied by BSTOUT; voltage is regulated to LDOOUT + 1.1V for optimal LDO headroom and PSRR |
| EN (Pin 7) | Enable control | Logic-high (>1.25V) enables both regulators; logic-low (<0.4V) disables with <1µA shutdown current |
| BSTOUT (Pin 8) | Boost output | Regulated output of boost stage; supplies LDOIN and must be bypassed to GND with 4.7µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and PCB footprint while enabling seamless boost-to-LDO power transfer |
| Load disconnect in shutdown | Internal switch isolates LDOOUT from input during EN = low, preventing backfeed and enabling true system-level power gating |
| Thermal and short-circuit protection | Auto-recovering thermal shutdown and current limiting protect device and downstream circuitry under fault conditions |
| 1.1V BSTOUT-to-LDOOUT regulation | Optimizes LDO transient response and ripple rejection while minimizing power loss across pass element |
| 2.2MHz fixed switching frequency | Enables use of miniature 3.3µH inductors and simplifies EMI filter design with predictable noise spectrum |
Applications
| Portable Sensor Biasing | Low-Noise Op Amp Supply |
|---|---|
Use Scenario: Powering MEMS accelerometers and precision temperature sensors in battery-powered IoT nodes where supply noise directly impacts measurement resolution. IC Role / Device Role / Timing Role: Provides ultra-low-noise 3.3V bias rail with <120µVRMS noise floor and 0.1% load regulation to maintain sensor excitation stability. Use Value: Enables 16-bit+ effective resolution in ADC-based sensor interfaces without requiring additional post-regulation filtering. | Use Scenario: Supplying rail-to-rail input/output op amps in handheld medical devices where amplifier THD and SNR are critical. IC Role / Device Role / Timing Role: Delivers clean 3.3V supply with 60dB ripple rejection at 1MHz to suppress switching artifacts from adjacent digital subsystems. Use Value: Reduces op amp output noise floor by >20dB compared to direct boost-derived supply, improving dynamic range in analog front-ends. |
| Single-Cell Li-Ion Bias Generation | Industrial Signal Conditioning |
Use Scenario: Generating stable 3.3V bias from aging 2.7V–4.8V single-cell Li-ion batteries in portable test equipment. IC Role / Device Role / Timing Role: Combines wide-input boost and precision LDO to sustain regulated output across full battery discharge curve. Use Value: Extends usable battery life by 18% versus discrete boost+LDO solutions due to integrated power path optimization. | Use Scenario: Powering isolated analog signal conditioners in factory automation modules operating in electrically noisy environments. IC Role / Device Role / Timing Role: Supplies 3.3V to instrumentation amplifiers and ADC drivers with load disconnect during system sleep modes. Use Value: Prevents leakage current paths during standby, reducing system quiescent current to <1µA and meeting IEC 62368-1 energy efficiency requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise bias generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3048EDC-3.3#TRPBF | E-grade (0°C to 125°C) vs. I-grade (–40°C to 125°C); identical electrical specs and pinout | Suitable for commercial/industrial ambient environments but not extended-temperature industrial or automotive under-hood | Select LT3048IDC-3.3#TRPBF for designs requiring guaranteed performance down to –40°C junction temperature. |
| LT3095IMSE#TRPBF | Dual-channel, 450kHz–2MHz adjustable frequency, 4µVRMS noise, 3mm × 5mm QFN-24 | Supports two independent bias rails; higher integration but larger footprint and different pin compatibility | Choose LT3095IMSE#TRPBF only when dual-output capability and sub-5µVRMS noise justify larger package and layout redesign. |
Compared with LT3048EDC-3.3#TRPBF, the LT3048IDC-3.3#TRPBF guarantees full-spec operation at –40°C, making it essential for cold-environment deployments; versus LT3095IMSE#TRPBF, it offers smaller size and lower cost for single-rail applications but lacks dual-channel flexibility and ultra-low-noise capability.
Availability
LT3048IDC-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3048IDC-3.3#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 consumer markets.
The LT3048 series was designed specifically for ultra-low-noise bias generation in precision analog systems, combining high-efficiency boost conversion with LDO filtering in miniature packages to replace discrete multi-stage solutions.
FAQ
What is the guaranteed output voltage tolerance for LT3048IDC-3.3#TRPBF over temperature?
The LT3048IDC-3.3#TRPBF guarantees a 3.300V output with ±0.05V tolerance (±1.5%) over the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table for LDOOUT regulation voltage under load conditions of 100µA to 40mA.
Does LT3048IDC-3.3#TRPBF require an external Schottky diode?
No, the LT3048IDC-3.3#TRPBF integrates a Schottky diode internally-its anode connects to the SW pin and cathode to BSTOUT-eliminating the need for any external diode and reducing solution size and component count.
How does the BYP pin function in LT3048IDC-3.3#TRPBF?
The BYP pin on the LT3048IDC-3.3#TRPBF accepts an optional 1nF capacitor connected to LDOOUT to reduce output voltage noise by ~2× (from 120µVRMS to 42µVRMS) and provides controlled soft-start behavior; leaving BYP unconnected results in standard startup timing and higher noise.
What is the recommended inductor value for LT3048IDC-3.3#TRPBF?
The datasheet specifies a 3.3µH inductor for the LT3048IDC-3.3#TRPBF, optimized for 40mA output at 3.3V; recommended part numbers include LPS3008-332MR (Coilcraft) or equivalent low-DCR, shielded inductors rated for ≥150mA RMS current.
Can LT3048IDC-3.3#TRPBF operate with input voltage below 2.7V?
No, the absolute minimum input voltage for LT3048IDC-3.3#TRPBF is 2.7V per Absolute Maximum Ratings and Electrical Characteristics; operation below this threshold is not characterized and may result in unstable regulation or failure to start.
LT3048IDC-3.3#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:
- 2.2MHz
- Voltage/Current - Output 1:
- 4.4V, 300mA
- Voltage/Current - Output 2:
- 3.3V, 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)
LT3048IDC-3.3#TRPBF FAQ
1.How can I place an order for LT3048IDC-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3048IDC-3.3#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 LT3048IDC-3.3#TRPBF reliable?
The price and inventory of LT3048IDC-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3048IDC-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3048IDC-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3048IDC-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3048IDC-3.3#TRPBF?
LT3048IDC-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3048IDC-3.3#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 LT3048IDC-3.3#TRPBF?
For technical support, including LT3048IDC-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3048IDC-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3048IDC-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3048IDC-3.3#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 LT3048IDC-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3048IDC-3.3#TRPBF?
All LT3048IDC-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3048IDC-3.3#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 LT3048IDC-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3048IDC-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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