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Analog Devices Inc. LT3048IDC-15#TRPBF
- Part No.:
- LT3048IDC-15#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3048IDC-15#TRPBF.pdf
- Description:
- IC REG DL BOOST/LNR 2.2MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,441
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Product details
Overview
LT3048IDC-15#TRPBF from Analog Devices is a dual-stage low-noise bias generator IC combining a 1MHz boost regulator and a low-dropout linear regulator in an 8-lead 2mm × 2mm DFN package. It delivers a fixed 15V output at up to 24mA from 2.7V–4.8V input, achieves <60µVRMS noise (10Hz–100kHz) with 1nF BYP capacitor, and provides >60dB ripple rejection at 1MHz - ideal for powering precision op amps and high-resolution ADCs from single-cell Li-ion batteries.
For engineers reviewing the LT3048IDC-15#TRPBF datasheet, LT3048IDC-15#TRPBF pinout, LT3048IDC-15#TRPBF application, or LT3048IDC-15#TRPBF equivalent, key selection criteria include its fixed 15V output, integrated Schottky diode, BSTOUT-to-LDOOUT regulation offset of 1.1V, thermal/short-circuit protection, and load disconnect during shutdown - all verified across –40°C to 125°C junction temperature.
Technical Context
The LT3048IDC-15#TRPBF implements peak current-mode control in its boost stage, enabling stable operation with small inductors (10µH recommended) and predictable ripple. Its LDO input (LDOIN) is supplied by BSTOUT, regulated precisely 1.1V above LDOOUT to optimize transient response and PSRR.
Unlike adjustable variants, the LT3048IDC-15#TRPBF uses internal feedback to fix LDOOUT at 15.00V (±1.5% over load/temperature), eliminating external resistors. The BYP pin accepts a 1nF capacitor to reduce broadband noise and improve soft-start behavior without compromising stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15.00V ±1.5% (100µA–24mA load, –40°C to 125°C) |
| Output Noise | <60µVRMS (10Hz–100kHz, CBYP = 1nF, ILOAD = 24mA) |
| PSRR @ 1MHz | >60dB (ensures effective suppression of boost switching artifacts) |
| Switching Frequency | 1.00MHz typical (0.75–1.25MHz over temp; enables compact 10µH inductor) |
| BSTOUT Regulation | Regulated to LDOOUT + 1.1V (minimizes LDO power dissipation and improves transient headroom) |
| Quiescent Current | 20µA typical (LDO stage); 600µA max (VIN quiescent, not switching) |
| Protection Features | Thermal shutdown, short-circuit current limit (45–80mA), load disconnect in shutdown |
Pinout & Package
LT3048IDC-15#TRPBF is housed in an 8-lead (2mm × 2mm) plastic DFN package with exposed pad (Pin 9) required to be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Boost switch node | Collector of internal NPN transistor and anode of integrated Schottky diode; carries high-frequency AC current |
| VIN (Pin 2) | Input supply | Supplies boost regulator; requires local 1µF ceramic bypass to GND |
| GND (Pin 3) | Ground reference | Primary ground return; must be connected to PCB ground plane and exposed pad |
| BYP (Pin 4) | Noise reduction terminal | Accepts optional 1nF capacitor to LDOOUT to lower broadband noise and control soft-start slew rate |
| LDOOUT (Pin 5) | Fixed 15V output | Regulated 15V supply rail; requires ≥1µF low-ESR ceramic output capacitor |
| LDOIN (Pin 6) | LDO input | Connected internally to BSTOUT; supplies LDO stage with voltage 1.1V above LDOOUT |
| 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 16.1V (15V + 1.1V); powers LDOIN and requires 4.7µF ceramic bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reduces board area, and avoids reverse recovery losses |
| 1.1V BSTOUT–LDOOUT offset | Optimizes LDO efficiency and PSRR while limiting worst-case power dissipation under overload |
| Load disconnect in shutdown | Prevents backfeed from LDOOUT to input during disable, critical for battery-powered systems |
| 1nF BYP capacitor support | Reduces output noise by >75% (vs. no BYP) and improves transient response without destabilizing loop |
| –40°C to 125°C operation | Qualified for industrial and automotive under-hood applications requiring extended temperature reliability |
Applications
| High-Precision Op Amp Biasing | Low-Noise ADC Reference Supply |
|---|---|
Use Scenario: Powering rail-to-rail input/output op amps in portable instrumentation where supply noise directly impacts signal integrity. IC Role / Device Role / Timing Role: Provides ultra-low-noise 15V bias rail with <60µVRMS noise and >60dB PSRR, isolating analog signal path from switching artifacts. Use Value: Enables 18-bit+ effective resolution in battery-powered data acquisition without external filtering or post-regulation. | Use Scenario: Supplying reference voltage circuitry and analog front-end stages in handheld medical sensors. IC Role / Device Role / Timing Role: Delivers stable 15V bias with <1.5% total output variation over load/temperature, supporting accurate gain calibration. Use Value: Eliminates need for discrete LDO + boost combos, reducing BOM count and layout sensitivity to EMI coupling. |
| Single-Cell Li-ion RF Bias | Portable Spectrometer Detector Bias |
Use Scenario: Generating clean 15V bias for GaAs FET amplifiers or PIN diode switches in compact IoT transceivers. IC Role / Device Role / Timing Role: Converts 2.7–4.8V battery voltage to regulated 15V with integrated boost+LDO architecture and shutdown current <1µA. Use Value: Extends battery life via low quiescent current and eliminates external inductor saturation concerns through current-mode control. | Use Scenario: Supplying photomultiplier tube (PMT) or avalanche photodiode (APD) bias in field-deployable spectroscopy tools. IC Role / Device Role / Timing Role: Delivers low-ripple 15V output with thermal/short-circuit protection, ensuring safe operation during detector voltage ramp-up. Use Value: Replaces discrete DC/DC + linear regulator stacks, reducing footprint by >40% while maintaining <0.1% load regulation. |
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-15#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 only; not rated for cold-start automotive or extended industrial use | Select when full –40°C operation is unnecessary and cost optimization is prioritized |
| LT3095EDD#TRPBF | Dual-channel (2× independent 1V–20V outputs), 450kHz–2MHz programmable frequency, 4µVRMS noise, 24-lead QFN | Supports dual-rail biasing (e.g., ±15V) and wider output range; larger package and higher complexity | Choose for multi-output systems requiring matched low-noise rails or programmable voltage tuning |
Compared with LT3048EDC-15#TRPBF, the LT3048IDC-15#TRPBF guarantees operation down to –40°C, making it suitable for outdoor or automotive auxiliary systems; versus LT3095EDD#TRPBF, it offers simpler single-rail implementation in half the footprint but lacks dual-channel flexibility and sub-4µV noise performance.
Availability
LT3048IDC-15#TRPBF is available at Aetrix Electronics and suitable for high-precision op amp biasing, portable spectrometer detector biasing, and single-cell Li-ion RF bias applications requiring stable component supply, guaranteed –40°C to 125°C operation, and low-noise performance.
Supply support for LT3048IDC-15#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, industrial automation, and communications markets.
The LT3048 series was designed specifically for ultra-low-noise bias generation in space-constrained, battery-powered systems - integrating boost conversion and LDO regulation to replace multi-component solutions while maintaining sub-60µVRMS noise and robust protection.
FAQ
What is the guaranteed output voltage tolerance for LT3048IDC-15#TRPBF over temperature and load?
The LT3048IDC-15#TRPBF guarantees a 15.00V output with ±1.5% total error across –40°C to 125°C junction temperature and 100µA to 24mA load current, as specified in the Electrical Characteristics table (LDOOUT Regulation Voltage, LT3048-15 row). This includes initial accuracy, line regulation, load regulation, and temperature drift - verified per Analog Devices' production test flow.
Can LT3048IDC-15#TRPBF operate with input voltage below 2.7V?
No. The LT3048IDC-15#TRPBF has a minimum specified VIN of 2.7V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V may result in failure to regulate, reduced efficiency, or undefined behavior - especially since the boost stage requires sufficient headroom to generate BSTOUT = LDOOUT + 1.1V = 16.1V.
What is the purpose of the BYP pin on LT3048IDC-15#TRPBF, and what capacitor value is recommended?
The BYP pin on LT3048IDC-15#TRPBF accepts an optional capacitor between LDOOUT and BYP to reduce broadband output noise and control soft-start slew rate. A 1nF ceramic capacitor is recommended - it lowers RMS noise from ~250µV to <60µV (10Hz–100kHz) and improves transient response without affecting loop stability.
Does LT3048IDC-15#TRPBF require an external feedback resistor network?
No. Unlike the adjustable LT3048 variant, the LT3048IDC-15#TRPBF integrates internal feedback to fix the output at 15.00V. No external resistors are needed - simplifying design, reducing component count, and eliminating resistor tolerance errors that affect accuracy in programmable versions.
How does LT3048IDC-15#TRPBF handle overload or short-circuit conditions?
Under overload or short-circuit, the LT3048IDC-15#TRPBF limits LDO output current to 45–80mA (typical 60mA), causing LDOOUT voltage to drop. Simultaneously, the boost regulator reduces BSTOUT to maintain the 1.1V offset, minimizing power dissipation in the internal pass transistor. Thermal shutdown activates if junction temperature exceeds 125°C.
LT3048IDC-15#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:
- 16.1V, 300mA
- Voltage/Current - Output 2:
- 15V, 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-15#TRPBF FAQ
1.How can I place an order for LT3048IDC-15#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3048IDC-15#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-15#TRPBF reliable?
The price and inventory of LT3048IDC-15#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-15#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3048IDC-15#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3048IDC-15#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3048IDC-15#TRPBF?
LT3048IDC-15#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3048IDC-15#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-15#TRPBF?
For technical support, including LT3048IDC-15#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3048IDC-15#TRPBF requirements.
6.How does Aetrix verify that LT3048IDC-15#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3048IDC-15#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-15#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3048IDC-15#TRPBF?
All LT3048IDC-15#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3048IDC-15#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-15#TRPBF part is unused and in its original packaging.
Return procedure for LT3048IDC-15#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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