Manufacturer Part Number

TPS51285ARUKR

Description

Quad output voltage regulator IC combining two synchronous step-down (buck) controllers and two linear (LDO) regulators. Designed for compact, efficient power management. Operates at high frequencies (400kHz, 475kHz) to enable small external components. Packaged in a 20-pin, 3mm x 3mm WQFN for space-critical designs. Suitable for battery-powered and embedded systems needing multiple voltage rails. Industry-standard, reliable, RoHS3 compliant.

Specifications

Four outputs: two buck controllers for step-down DC-DC conversion, two LDO for low-noise linear regulation

Input supply voltage: 5V to 24V

Buck switching frequency: 400kHz and 475kHz

LDO output: Channel 3 provides 3.3V at 100mA

Output 1 and Output 2 are controllers (external power devices required)

Operating temperature range: -40°C to 85°C

Mounting: Surface mount, 20-WQFN package with exposed pad (3mm x 3mm)

RoHS3 compliant, MSL 1 (unlimited moisture resistance), REACH unaffected

Active product status with large inventory

Device Structure

Contains two synchronous buck controller channels for high-efficiency step-down regulation

Contains two integrated linear regulators (LDO) for low-noise outputs

Integrated in a single small 20-WQFN (3x3) package

Exposed pad for improved thermal dissipation

Requires external components for buck regulation and filtering

Controller outputs require external MOSFETs

Performance Characteristics

Wide operating input range from 5V up to 24V supports a variety of power sources

Efficient conversion through synchronous buck design for power savings and heat reduction

High switching frequencies (400kHz, 475kHz) minimize size of inductors and capacitors

Stable operation across full temperature range (-40°C to +85°C)

System flexibility: programmable and configurable outputs

Compact solution reduces PCB footprint

Application Environments

Well-suited for embedded systems, notebook computers, tablets, industrial control, consumer electronics

Ideal for systems requiring multiple supply voltages or low-noise rails

Appropriate for power sequencing and regulation in FPGA, ASIC, microprocessor circuits

Used in battery-powered equipment requiring efficiency and small size

Selection Guidelines

Choose for designs needing up to four regulated outputs with a mix of high-efficiency switching and low-noise linear power

Suitable when input voltage falls within 5V-24V and space constraints are present

Consider if external MOSFETs are available for buck controller outputs

Select for RoHS, REACH, and environmental compliance

Verify LDO current (100mA) meets your needs for low power loads

Check frequency compatibility with system noise and EMI requirements

Usage Considerations

Requires proper PCB layout for thermal and electrical performance

Pay special attention to external power MOSFET choice and quality for buck outputs

Design input and output filtering to minimize voltage ripple and noise

Observe moisture sensitivity handling: MSL 1, so minimal concern

Keep within recommended operating temperature and supply voltage ranges

Confirm compatibility of LDO output with connected loads

Potential Equivalent/Replacement Models

No direct drop-in replacements from other manufacturers are assured due to integrated multi-output and controller-LDO mix. For alternative models with similar four-output (dual buck + dual LDO) configuration, options may be limited.

Alternative within Texas Instruments: Review other D-CAP™ series multi-rail regulators, such as TPS51220, TPS51219, or TPS51285 series variations for similar topology but check pin configuration and feature set.

Other manufacturers: Search for quad output PMIC with two synchronous buck controllers and two LDOs in a QFN package, but expect differences in footprint and features.

If you require a direct functional or drop-in compatible alternative, please contact the Ariat-Tech sales team for detailed cross-reference and technical support.

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