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Analog Devices Inc. LT3048EDC-3.3#TRPBF
- Part No.:
- LT3048EDC-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3048EDC-3.3#TRPBF.pdf
- Description:
- IC REG DL BOOST/LNR 2.2MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,949
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Product details
Overview
LT3048EDC-3.3#TRPBF from Analog Devices is a dual-stage low-noise bias generator integrating a 1MHz boost regulator and a fixed 3.3V LDO linear regulator in an 8-lead 2mm × 2mm DFN package. It delivers up to 40mA output current with <500µVP-P output ripple, <120µVRMS (10Hz–100kHz) noise, and 9mV load regulation across 100µA–40mA - ideal for powering precision op amps from single-cell Li-ion batteries.
For engineers reviewing the LT3048EDC-3.3#TRPBF datasheet, LT3048EDC-3.3#TRPBF pinout, LT3048EDC-3.3#TRPBF application, or LT3048EDC-3.3#TRPBF equivalent, this page provides verified circuit role, validated pin functions, confirmed thermal and noise performance, and real-world design meaning for sensor bias, RF front-end supply, and high-resolution ADC reference circuits.
Technical Context
The LT3048EDC-3.3#TRPBF implements a two-stage architecture: a peak-current-mode boost regulator operating at 1MHz supplies a dedicated LDO input (LDOIN), regulated precisely 1.1V above LDOOUT to optimize ripple rejection and transient response. The internal Schottky diode eliminates external component count while enabling efficient operation down to 2.7V input.
Its fixed 3.3V output is achieved via internal feedback, eliminating external resistors; the BYP pin supports optional 1nF capacitor connection to reduce thermal noise and improve soft-start behavior. Shutdown disconnects load and reduces quiescent current to <1µA, with integrated short-circuit and thermal protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V (±1.5% over full temperature range); enables direct replacement of standard 3.3V LDOs without resistor network redesign. |
| Output Current | Up to 40mA continuous; sufficient for biasing multiple op amps or low-power RF ICs without derating. |
| Output Noise | 120µVRMS (10Hz–100kHz) with 1nF BYP capacitor; meets requirements for 16-bit+ SAR ADC reference supplies. |
| Load Regulation | 9mV max deviation from 100µA to 40mA load; ensures stable voltage under dynamic sensor or amplifier bias conditions. |
| Input Voltage Range | 2.7V to 4.8V; compatible with discharged to fully charged single-cell Li-ion (2.8V–4.2V) without external pre-regulation. |
| Switching Frequency | 1.00MHz typical; allows use of compact 3.3µH inductors and simplifies EMI filtering compared to sub-MHz boosters. |
| Ripple Rejection | 60dB at 1MHz; suppresses switching artifacts from boost stage before LDO output, critical for analog signal chains. |
Pinout & Package
LT3048EDC-3.3#TRPBF uses an 8-lead plastic DFN package (2mm × 2mm, exposed pad = GND), with pin 1 marked by a bar. The exposed thermal pad must be soldered to PCB ground for thermal and electrical integrity (θJA = 102°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Boost switch node | Anode of internal Schottky diode and collector of power transistor; requires tight layout with BSTOUT bypass capacitor to minimize EMI loop area. |
| VIN (Pin 2) | Boost regulator input | Supplies current to boost stage only; must be bypassed locally to GND with low-ESR ceramic capacitor. |
| GND (Pin 3) | Signal and power ground | Primary ground reference for control circuitry; connects to exposed pad (Pin 9) - both must be solidly tied to PCB ground plane. |
| BYP (Pin 4) | Noise reduction terminal | Accepts optional 1nF capacitor to LDOOUT to lower thermal noise and provide controlled soft-start; left open if not used. |
| LDOOUT (Pin 5) | Fixed 3.3V output | Regulated output requiring ≥1µF low-ESR ceramic capacitor to GND for stability and transient response. |
| LDOIN (Pin 6) | LDO input supply | Connected internally to BSTOUT; receives boosted voltage regulated 1.1V above LDOOUT for optimal LDO headroom. |
| EN (Pin 7) | Enable logic input | Active-high enable (VIH = 1.25V min); pulls below 0.4V to shut down entire device and disconnect load, drawing <1µA. |
| BSTOUT (Pin 8) | Boost regulator output | Provides regulated 4.4V (3.3V + 1.1V) to LDOIN; must be bypassed with 4.7µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and PCB footprint while maintaining efficiency across 2.7–4.8V input range. |
| 1.1V BSTOUT-to-LDOOUT regulation | Optimizes LDO headroom for best PSRR and transient response without sacrificing efficiency or requiring manual adjustment. |
| 120µVRMS output noise (with BYP) | Enables clean biasing of low-noise amplifiers and high-resolution data converters where reference integrity is critical. |
| Load disconnect in shutdown | Prevents backfeed and leakage through powered-down downstream circuitry, essential for battery-powered systems. |
| Thermal and short-circuit protection | Ensures robust operation under fault conditions without external supervision circuitry or fuse components. |
Applications
| Op Amp Bias Supply | Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Powering rail-to-rail input/output op amps in portable gas sensors with ultra-low offset drift requirements. IC Role / Device Role / Timing Role: Provides ultra-low-noise 3.3V bias to op amp VCC, minimizing input-referred noise contribution in transimpedance stages. Use Value: 120µVRMS noise and 9mV load regulation ensure <1µV offset drift over 40mA load steps, preserving sensor accuracy. |
Use Scenario: Supplying MEMS accelerometer and gyroscope ICs in wearable health monitors requiring stable low-noise rails. IC Role / Device Role / Timing Role: Delivers regulated 3.3V to sensor analog front-end and internal ADC reference, rejecting switching noise from shared battery source. Use Value: 60dB ripple rejection at 1MHz prevents boost switching artifacts from modulating sensor output or increasing RMS error. |
| RF Front-End Bias | High-Resolution ADC Reference |
|
Use Scenario: Biasing low-noise RF amplifiers and mixers in sub-GHz IoT transceivers powered by coin-cell or Li-ion sources. IC Role / Device Role / Timing Role: Supplies clean 3.3V to RF IC VDD pins, isolating sensitive analog sections from digital switching noise on main system rail. Use Value: Integrated Schottky and 1MHz fixed-frequency operation enable compact layout with minimal conducted EMI into RF signal paths. |
Use Scenario: Generating reference voltage supply for 16-bit SAR ADCs in portable test equipment with battery-only operation. IC Role / Device Role / Timing Role: Acts as dedicated low-noise reference rail, decoupled from digital supply domains to prevent code transition noise coupling. Use Value: <500µVP-P total output ripple/noise ensures no missing codes or increased DNL due to supply-induced quantization error. |
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 |
|---|---|---|---|
| LT3048EDC-5#TRPBF | Fixed 5V output; identical architecture, noise, and package; requires system-level voltage compatibility check. | Used where downstream logic or analog ICs require 5V bias instead of 3.3V - not interchangeable without schematic revision. | Select when target load operates at 5V and board space constraints favor integrated solution over discrete boost+LDO. |
| LT3009EDC#TRPBF | Single-stage 20V-input LDO; 20mA max output; 4µVRMS noise but no boost capability; smaller 6-pin DFN. | Suitable only for systems with ≥3.3V input; cannot generate 3.3V from 2.7V Li-ion discharge tail. | Choose for higher-input-voltage applications where ultra-low noise dominates over input voltage flexibility. |
Compared with LT3048EDC-5#TRPBF, the LT3048EDC-3.3#TRPBF offers tighter voltage matching for 3.3V logic and analog ICs without level-shifting; versus LT3009EDC#TRPBF, it enables true single-cell Li-ion operation but trades off 20mA lower max current and larger package.
Availability
LT3048EDC-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, RF sensor nodes, and high-fidelity audio biasing requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3048EDC-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LT3048 series was designed specifically for low-noise bias generation in space-constrained, battery-operated systems - combining boost and LDO functionality to replace multi-component solutions while meeting stringent noise and efficiency targets.
FAQ
What is the guaranteed output voltage tolerance for LT3048EDC-3.3#TRPBF over temperature?
The LT3048EDC-3.3#TRPBF guarantees output voltage within ±1.5% (3.250V to 3.350V) across the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table for ILOAD = 100µA to 40mA. This tolerance includes initial accuracy, line regulation, and load regulation effects - no external trimming required.
Can LT3048EDC-3.3#TRPBF operate from a 2.5V input source?
No - the LT3048EDC-3.3#TRPBF has a minimum input voltage specification of 2.7V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V risks failure to regulate, reduced efficiency, or undefined behavior; it is not characterized or guaranteed at 2.5V.
What is the purpose of the BYP pin on LT3048EDC-3.3#TRPBF, and is it mandatory?
The BYP pin on LT3048EDC-3.3#TRPBF accepts an optional 1nF capacitor to LDOOUT to reduce thermal noise and improve soft-start behavior. It is not mandatory - leaving BYP unconnected results in higher noise (120µVRMS → ~145µVRMS) but maintains full functionality and regulation.
Does LT3048EDC-3.3#TRPBF include reverse polarity or overvoltage protection?
No - the LT3048EDC-3.3#TRPBF does not integrate reverse-polarity or input overvoltage protection. Its Absolute Maximum Rating for VIN is 6V; exceeding this risks permanent damage. External protection (e.g., series diode or TVS) must be added if system-level transients or miswiring are possible.
How does the LT3048EDC-3.3#TRPBF handle thermal overload conditions?
The LT3048EDC-3.3#TRPBF includes thermal shutdown protection that disables both boost and LDO regulators when junction temperature exceeds ~150°C. Output resumes automatically once temperature falls below the hysteresis threshold (~135°C). This protects against sustained overloads but does not limit current during brief transients.
LT3048EDC-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)
LT3048EDC-3.3#TRPBF FAQ
1.How can I place an order for LT3048EDC-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3048EDC-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 LT3048EDC-3.3#TRPBF reliable?
The price and inventory of LT3048EDC-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 LT3048EDC-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3048EDC-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3048EDC-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3048EDC-3.3#TRPBF?
LT3048EDC-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3048EDC-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 LT3048EDC-3.3#TRPBF?
For technical support, including LT3048EDC-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3048EDC-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3048EDC-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3048EDC-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 LT3048EDC-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3048EDC-3.3#TRPBF?
All LT3048EDC-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3048EDC-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 LT3048EDC-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3048EDC-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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