Texas Instruments LP3996SD-3030

Overview

LP3996SD-3030 from Texas Instruments is a dual low-dropout linear regulator IC with independent 3.0 V/300 mA and 3.0 V/150 mA outputs, integrated power-on-reset (POR) circuitry, ±1.5% output voltage accuracy at room temperature, and ultra-low 35 µA quiescent current in enabled state-designed for portable power management in space-constrained wireless network adaptors.

For engineers reviewing the LP3996SD-3030 datasheet, LP3996SD-3030 pinout, LP3996SD-3030 application, or LP3996SD-3030 equivalent, key selection considerations include dual-output sequencing control via EN1/EN2, adjustable POR delay using the SET pin, ceramic-capacitor stability down to 1 µF, and thermal shutdown protection at 160°C junction temperature.

Technical Context

The LP3996SD-3030 integrates two independent LDO regulators sharing a common input stage but featuring separate enable inputs (EN1, EN2), output pins (VOUT1, VOUT2), and internal reference bypass (CBYP). LDO2 provides 300 mA output with built-in POR monitoring and open-drain flag output (POR), while LDO1 delivers 150 mA without POR functionality.

Its POR function monitors only VOUT2, asserting low when output falls below 88% of nominal (3.0 V), releasing high after recovery to ≥96% (2.88 V); delay is programmable via external capacitor on SET pin (1.3 µA current source, 1.25 V threshold), enabling precise microprocessor reset timing.

Key Specifications

Pinout & Package

LP3996SD-3030 is housed in a 10-pin WSON package (3 mm × 3 mm, DSC0010A), thermally enhanced with exposed GND pad. Pin 7 is no-connect (N/C); pin 6 and the exposed pad are both GND and must be connected externally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7733QPWRQ1 and TPS79930YZUR, the LP3996SD-3030 uniquely delivers two independently controlled 3.0 V outputs with integrated POR-enabling true dual-rail power sequencing in a single 3 mm × 3 mm package, whereas alternatives require multiple devices or sacrifice critical features like adjustable delay or independent enable.

Availability

LP3996SD-3030 is available at Aetrix Electronics and suitable for wireless network adaptors, cellular handsets, and PDAs requiring stable component supply, consistent lead-free packaging, and long-term production continuity.

Supply support for LP3996SD-3030 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 connectivity technologies, with decades of expertise in power management IC design.

The LP3996 product line targets portable electronics requiring ultra-low quiescent current, small-footprint dual-LDO solutions with integrated power-good monitoring-optimized for battery life and board space reduction in handheld and wireless devices.

FAQ

What output voltages does the LP3996SD-3030 provide?

The LP3996SD-3030 provides two fixed 3.0 V outputs: VOUT1 delivers up to 150 mA, and VOUT2 delivers up to 300 mA. Both outputs are factory-trimmed to ±1.5% accuracy at room temperature and maintain ±3% over –40°C to +125°C. The "3030" suffix explicitly denotes the 3.0 V / 3.0 V configuration per TI's ordering table.

How is the power-on-reset (POR) delay adjusted on the LP3996SD-3030?

The POR delay on the LP3996SD-3030 is set by connecting an external capacitor between the SET pin (Pin 5) and GND. The internal 1.3 µA current source charges this capacitor to a 1.25 V threshold; delay time equals (1.25 V × C_SET) / 1.3 µA. For example, a 0.1 µF capacitor yields ~100 ms delay. Leaving SET open disables POR delay entirely.

What is the minimum input voltage required for the LP3996SD-3030 to regulate 3.0 V outputs?

The LP3996SD-3030 requires a minimum input voltage of 3.21 V to maintain regulation on VOUT2 at 300 mA load, based on its 210 mV dropout voltage specification. At lighter loads, dropout decreases (e.g., 110 mV at 150 mA for VOUT1), allowing lower VIN. Per datasheet, VIN(MIN) = VOUT(NOM) + 0.5 V or 2.0 V, whichever is higher-so 3.5 V is recommended for margin across temperature and process variation.

Can the LP3996SD-3030 operate with ceramic output capacitors smaller than 1 µF?

No-the LP3996SD-3030 is characterized and guaranteed stable only with output capacitance ≥1.0 µF (minimum 0.7 µF per spec), and ESR between 5 mΩ and 500 mΩ. Using smaller ceramics risks instability, excessive output ripple, or failure to meet transient response specs. X7R or X5R dielectrics are recommended for temperature stability.

Does the LP3996SD-3030 support independent shutdown of each LDO output?

Yes-the LP3996SD-3030 features two active-high enable inputs: EN1 controls VOUT1 (150 mA), and EN2 controls VOUT2 (300 mA) and the POR circuit. Driving either enable pin low shuts down its respective LDO, reducing quiescent current to <10 nA. This allows dynamic power gating of subsystems without affecting the other output.