Analog Devices Inc. LT3048IDC-5#TRPBF

Overview

LT3048IDC-5#TRPBF from Analog Devices is a dual-stage bias generator integrating a 1MHz fixed-frequency boost regulator and a low-noise LDO linear regulator in an 8-lead 2mm × 2mm DFN package. It delivers a precise 5.00V ±25mV output at up to 40mA from 2.7V–4.8V input, achieving <500µV_P-P output ripple and 50µV_RMS noise (10Hz–100kHz) with 1nF BYP capacitor - ideal for powering high-precision op amps and analog sensors from single-cell Li-ion batteries.

For engineers reviewing the LT3048IDC-5#TRPBF datasheet, LT3048IDC-5#TRPBF pinout, LT3048IDC-5#TRPBF application, or LT3048IDC-5#TRPBF equivalent, key selection criteria include its integrated Schottky diode, BSTOUT-to-LDOOUT regulation at 1.1V, 0.1% load regulation, thermal/short-circuit protection, and guaranteed operation across –40°C to 125°C junction temperature.

Technical Context

The LT3048IDC-5#TRPBF employs peak current-mode control in its boost stage for stable, predictable switching at 1MHz (typical), enabling use of small 4.7µH inductors. Its LDO input (LDOIN) is supplied by BSTOUT, regulated precisely 1.1V above LDOOUT to maximize PSRR and transient response while minimizing power dissipation during overload.

Unlike adjustable variants, the LT3048IDC-5#TRPBF uses internal feedback to fix LDOOUT at 5.00V (±1.5% over temperature), eliminating external resistors. The BYP pin accepts a 1nF capacitor to reduce thermal noise and improve soft-start behavior - a design choice confirmed for this specific variant in electrical characteristics tables and typical performance curves.

Key Specifications

Pinout & Package

LT3048IDC-5#TRPBF is housed in an 8-lead plastic DFN package (2mm × 2mm, exposed pad), with thermal resistance θ_JA = 102°C/W. The exposed pad (Pin 9) is GND and must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise bias generation applications.

Compared with LT3048EDC-5#TRPBF, the LT3048IDC-5#TRPBF offers identical functionality with enhanced temperature assurance; versus LT3095EDD#TRPBF, it integrates boost conversion for single-supply operation but trades off absolute noise floor and channel count for compactness and simplicity.

Availability

LT3048IDC-5#TRPBF is available at Aetrix Electronics and suitable for high-precision op amp biasing, low-noise sensor excitation, and portable instrumentation power requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.

Supply support for LT3048IDC-5#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 precision instrumentation, industrial automation, and communications markets.

The LT3048 series was designed specifically for low-noise bias generation in space-constrained, battery-powered analog systems - combining boost and LDO regulation to deliver clean, stable voltages from single-cell inputs without external compensation components.

FAQ

What is the guaranteed output voltage tolerance for LT3048IDC-5#TRPBF over temperature?

The LT3048IDC-5#TRPBF guarantees 5.00V output with ±25mV (±0.5%) tolerance across the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table for "LT3048-5: I_LOAD = 100µA" and "LT3048-5: 100µA ≤ I_LOAD ≤ 40mA" conditions. This includes initial accuracy, line regulation, and load regulation effects.

Does LT3048IDC-5#TRPBF require external feedback resistors to set its 5V output?

No, the LT3048IDC-5#TRPBF does not require external feedback resistors. It is a fixed-output variant with internal feedback network configured for 5.00V regulation, unlike the adjustable LT3048 version which uses FB pin and external resistor divider. Pin 5 is LDOOUT; Pin 4 is BYP; there is no FB pin on LT3048IDC-5#TRPBF.

What is the recommended inductor value and DC resistance for LT3048IDC-5#TRPBF in standard operation?

Analog Devices specifies a 4.7µH inductor with ≤350mΩ DCR for LT3048IDC-5#TRPBF, as documented in Table 2 ("Recommended Inductor Values") and confirmed in Typical Application TA05a. This value supports full 40mA output current at 5V with >70% efficiency across 2.7V–3.6V input range per Figure TA05b.

How does the BYP pin function on LT3048IDC-5#TRPBF, and what capacitor value is validated?

The BYP pin on LT3048IDC-5#TRPBF accepts an optional capacitor to LDOOUT to reduce output thermal noise and control soft-start behavior. A 1nF capacitor is explicitly validated for LT3048-5 variants in the Electrical Characteristics table (noise measurements) and Typical Performance Figures G19 and G23, delivering 50µV_RMS noise at 40mA load.

Is LT3048IDC-5#TRPBF pin-compatible with other LT3048-XX variants like LT3048IDC-3.3#TRPBF?

Yes, all LT3048-XX variants including LT3048IDC-5#TRPBF, LT3048IDC-3.3#TRPBF, and LT3048IDC-12#TRPBF share identical 8-lead DFN package, pinout, and thermal pad configuration. They differ only in internal feedback setting and recommended inductor value - enabling drop-in replacement for different output voltage requirements.