Texas Instruments LP38690SD-3.3/NOPB

Mfr. Part

LP38690SD-3.3/NOPB

Manufacturer

Texas Instruments (Luminary Micro brand)

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Detailed Description

Fixed 3.3 V, 1 A low-dropout (LDO) linear regulator in a compact 6-WSON (3x3 mm) package with exposed thermal pad. Wide input range up to 10 V. Low noise with 55 dB PSRR at 120 Hz. Robust operation from -40°C to +125°C. Surface-mount, RoHS3 compliant, supplied in Tape and Reel for high-volume assembly.

Key Features

Output voltage fixed at 3.3 V

Output current up to 1 A

Max input voltage 10 V

Max dropout 1 V at 1 A

PSRR 55 dB at 120 Hz for low ripple on the output

Operating temperature -40°C to +125°C

Positive output configuration

Single regulator channel

Over-temperature protection

Low quiescent current design for efficient standby

Surface-mount 6-WSON (3x3) with exposed pad

RoHS3 compliant

Base product number LP38690

Supplier device package 6-WSON (3x3)

Standard packaging Tape and Reel

Key Advantages

Clean 3.3 V rail with strong ripple rejection for noise-sensitive analog and digital loads

Compact footprint saves PCB space while the exposed pad improves heat dissipation

Simple, stable linear solution with predictable behavior and easy design-in

Wide input range supports many upstream supplies, including battery and adapter rails

Thermal protection helps safeguard the system under heavy load and high ambient temperature

Industrial temperature range supports harsh environments

Fixed output version simplifies BOM and reduces design complexity

Packaging

Type: Tape & Reel for automated pick-and-place assembly

Device package: 6-WSON (3x3 mm) with exposed thermal pad; also referenced as 6-WDFN EP

Material: Molded plastic package with copper leadframe; NOPB lead-free finish

Size: Approx. 3 mm × 3 mm body, ultra-low profile for dense layouts

Pin configuration: 6 terminals plus exposed pad; typical LDO pins include VIN, VOUT, GND, and control or bypass pins (refer to datasheet for exact pinout)

Thermal characteristics: Exposed pad designed to be soldered to a ground or thermal plane to reduce junction temperature; follow layout guidelines for best RθJA

Electrical properties summary: 3.3 V fixed output, up to 1 A load, max input 10 V, dropout up to 1 V at 1 A, PSRR 55 dB at 120 Hz, over-temperature protection

Compliance: RoHS3 compliant

Mounting: Surface Mount Technology (SMT)

Lifecycle

Status: Active and broadly used; not nearing discontinuation based on current industry status

Recommended TI alternatives and equivalents:

- TLV76733: 3.3 V, 1 A LDO, modern low-IQ option with WSON package variants

- TPS73733: 3.3 V, 1 A LDO, low-dropout family for noise-sensitive rails

- TPS74733: 3.3 V, up to 1.5 A LDO, very low dropout for higher current margin

- TPS7A8101: 1 A adjustable low-noise LDO (use resistors to set 3.3 V)

- LP38691: Adjustable LDO related to LP38690 family (set 3.3 V via resistor divider)

Notes: Footprint and pinout differ between families. Verify electrical specs, stability requirements, and package compatibility before substituting. If you need a footprint-compatible drop-in, contact our sales team on the Y-IC website for detailed cross references and the latest lifecycle updates.

Key Application Areas

3.3 V rails for MCUs, DSPs, and SoCs

FPGA and ASIC I/O supplies

Low-noise analog rails for ADCs, DACs, op-amps, audio circuits

RF modules, transceivers, and sensitive sensor interfaces

Industrial control, PLCs, instrumentation

Automotive infotainment and body electronics (non-safety), wide temp range

Communications equipment, routers, IoT gateways

Portable and battery-powered devices needing quiet 3.3 V regulation

Datasheet

Y-IC hosts the most authoritative datasheet for LP38690SD-3.3/NOPB on our product page. We recommend downloading it now to confirm pinout, capacitor requirements, electrical limits, and layout guidelines for the exposed thermal pad.

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