Texas Instruments LP5996SD-2828

Overview

LP5996SD-2828 from Texas Instruments is a dual-output low-dropout linear regulator IC with independent enable control, delivering 2.8V/150mA (LDO1) and 2.8V/300mA (LDO2) outputs, 1.5% room-temperature accuracy, ultra-low 35µA quiescent current (enabled), and stable operation with 1µF ceramic output capacitors. It serves as a compact power management solution for portable RF and baseband subsystems requiring tightly regulated, low-noise dual-rail supplies.

For engineers reviewing the LP5996SD-2828 datasheet, LP5996SD-2828 pinout, LP5996SD-2828 application, or LP5996SD-2828 equivalent, key selection criteria include dual independent enable logic, fixed 2.8V/2.8V output pairing, thermal shutdown protection, 10-pin WSON (3mm × 3mm) package compatibility, and support for ceramic bypass (CBYP) to improve PSRR and transient response.

Technical Context

The LP5996SD-2828 integrates two independent LDO regulators sharing a common input (VIN) and ground (GND), each with dedicated active-high enable pins (EN1, EN2) enabling selective power gating. Its internal voltage reference is bypassed via CBYP to reduce noise and enhance line transient immunity.

Designed for stability with minimal external components, it operates across 2.0V–6.0V input and supports full-spec performance from −40°C to +125°C junction temperature. Dropout voltage is 210mV at 300mA (LDO2) and 220mV at 150mA (LDO1), with thermal shutdown triggered at 160°C.

Key Specifications

Pinout & Package

LP5996SD-2828 uses a 10-pin WSON (DSC) package with an exposed thermal pad (GND-connected). The package measures 3mm × 3mm × 0.8mm and is RoHS-compliant with green (Pb-free, no Sb/Br) finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-LDO regulator applications.

Compared with TPS7A202828PDBVR, LP5996SD-2828 integrates two matched 2.8V LDOs in one 3mm × 3mm package with independent enable and CBYP noise reduction - reducing component count, layout area, and system-level noise coupling versus dual-single solutions.

Availability

LP5996SD-2828 is available at Aetrix Electronics and suitable for cellular handsets, wireless network adaptors, and portable medical sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LP5996SD-2828 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability, low-power IC design.

The LP5996 family was engineered for portable electronics demanding minimal board space, ultra-low quiescent current, and dual independent LDO regulation - targeting battery-powered RF, audio, and sensor subsystems.

FAQ

What output voltages does the LP5996SD-2828 provide?

The LP5996SD-2828 provides two fixed 2.8V outputs: VOUT1 delivers up to 150mA, and VOUT2 delivers up to 300mA. These are factory-trimmed outputs - no external resistors are needed. Both outputs maintain ±1.5% accuracy at room temperature and ±3% across −40°C to +125°C junction range, making LP5996SD-2828 ideal for matched dual-rail applications like RF transceivers and mixed-signal SoCs.

How does the CBYP pin improve performance in the LP5996SD-2828?

The CBYP pin in the LP5996SD-2828 connects to an internal voltage reference node and accepts a 10nF NPO/COG capacitor to ground. This configuration reduces broadband output noise to as low as 36µVRMS (10Hz–100kHz) and improves PSRR by up to 15dB at 1–20kHz. In practice, this means LP5996SD-2828 maintains clean 2.8V rails for noise-sensitive circuits such as VCOs and high-resolution ADCs without requiring additional filtering stages.

Can the LP5996SD-2828 operate with input voltage below 2.8V?

No - the LP5996SD-2828 requires a minimum input voltage of 2.0V, but to sustain regulated 2.8V outputs, VIN must exceed VOUT by at least the dropout voltage. At 300mA load, dropout is 210mV; thus, VIN must be ≥3.01V. Below that, VOUT drops out of regulation. The device will not function correctly if VIN falls below ~2.95V under full load, so LP5996SD-2828 is not suitable for sub-3V single-cell NiMH or deeply discharged Li-ion inputs.

What is the thermal performance of the LP5996SD-2828 in its WSON package?

The LP5996SD-2828 in the 10-pin WSON (DSC) package has a junction-to-ambient thermal resistance (θJA) of 55°C/W under standard JEDEC test conditions. With both LDOs delivering full rated current (150mA + 300mA) at 2.8V output and VIN = 4.2V, power dissipation reaches ~630mW - raising junction temperature by ~35°C above ambient. Proper PCB copper pour under the exposed pad is essential to maintain safe operation below the 125°C max junction limit.

Is the LP5996SD-2828 pin-compatible with other variants in the LP5996 family?

Yes - all LP5996 variants, including LP5996SD-2828, LP5996SD-3333, and LP5996SD-1525, share identical 10-pin WSON (DSC) packaging, pinout, and footprint. Only the fixed output voltage pair differs between variants. This allows direct PCB reuse across designs requiring different voltage combinations (e.g., 1.5V/2.5V vs. 2.8V/2.8V), provided the enable logic and capacitor values remain compatible with the new output levels.