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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Texas Instruments TPS51427RHBR

Name: TPS51427RHBR
Brand: Texas Instruments
SKU: TPS51427RHBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS51427RHBR

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 32-VFQFN Exposed Pad

Datasheet:: TPS51427RHBR.pdf

Description:: IC REG CTRLR NOTEBK 2OUT 32VQFN

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Product details

Overview

TPS51427RHBR from Texas Instruments is a dual synchronous step-down controller IC for notebook and mobile power rails, integrating two PWM controllers (SMPS1: 0.7–5.9 V adjustable; SMPS2: 0.5–2.5 V adjustable), a 5-V/3.3-V or 0.7–4.5-V LDO regulator (100 mA), and a dedicated 3.3-V always-on reference (VREF3). It supports 5.5–28 V input, D-CAP™ control with <100 ns transient response, and operates across –40°C to +85°C in a 32-pin QFN package.

For engineers reviewing the TPS51427RHBR datasheet, TPS51427RHBR pinout, TPS51427RHBR application, or TPS51427RHBR equivalent, this device is selected for high-efficiency dual-rail notebook I/O bus regulation where fast load-step response, low external component count, and seamless light-load efficiency (via Auto-Skip/OOA™ modes) are critical design requirements.

Technical Context

The TPS51427RHBR implements a dual-channel D-CAP™ adaptive on-time control architecture optimized for low-ESR output capacitors (e.g., POSCAP/SP-CAP), enabling stable regulation without external compensation. Each channel features independent enable (EN1/EN2), power-good (PGOOD1/PGOOD2), and overcurrent protection via R_DS(on) sensing with temperature-compensated TRIPx inputs.

It integrates adaptive gate drivers with internal boost switches for high-side FET enhancement, bootstrap charge auto-refresh, and selectable PWM-only/OOA™/Auto-Skip operating modes controlled by SKIPSEL. Frequency selection (200/300/400/500 kHz) is set via TONSEL, while output voltage ranges and LDO configuration are defined by VFB1, REFIN2, and LDOREFIN connections.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	5.5 V to 28 V - supports wide-input notebook adapter and battery-sourced rails without pre-regulation.
SMPS1 Output Range	0.7 V to 5.9 V - configurable for core logic, I/O, or system bus voltages with ±1% accuracy at 0.7 V.
SMPS2 Output Range	0.5 V to 2.5 V - targets memory, GPU, or peripheral rails with ±1.2% accuracy at 1.05 V.
LDO Output	Fixed 3.3 V/5 V or adjustable 0.7–4.5 V (2×LDOREFIN); 100 mA sourcing - supplies auxiliary circuits with switchover to VSW when enabled.
Transient Response	<100 ns - D-CAP™ mode enables rapid recovery from load steps without external loop compensation.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade notebook and mobile communication environments.
Switching Frequency	Selectable 200/300/400/500 kHz - balances efficiency, size, and EMI; OOA™ mode maintains >22 kHz under light loads.
Package	32-pin QFN (5 mm × 5 mm, RoHS-compliant, green) - surface-mount compatible with high-density PCB layouts.

Pinout & Package

TPS51427RHBR is housed in a 32-pin, 5-mm × 5-mm QFN package (RHB suffix) with exposed thermal pad. Pin functions are validated per TI SLUS819B datasheet (Rev. September 2008), including dual high-side/low-side gate drivers, independent feedback and enable inputs, and integrated references (VREF2, VREF3).

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main power input	Supplies internal LDOs and bias circuitry; accepts 5.5–28 V; powers SMPS1 if VOUT1 > 5 V.
VFB1	SMPS1 feedback input	Connects to resistive divider for 0.7–5.9 V output adjustment; threshold = 0.7 V (±1%).
REFIN2	SMPS2 feedback reference	Configures SMPS2 output: GND → 3.3 V, VREF3 → 1.05 V, or 0.5–2.5 V adjustable range.
LDOREFIN	LDO reference input	GND → 5 V LDO; V5FILT → 3.3 V LDO; 0.35–2.25 V → 0.7–4.5 V (2×LDOREFIN).
SKIPSEL	Operating mode select	GND → Auto-Skip; floating/VREF2 → OOA™; V5FILT → PWM-only - determines light-load behavior.
TONSEL	Frequency select	GND → 400/500 kHz; VREF2/open → 400/300 kHz; V5FILT → 200/300 kHz (SMPS1/SMPS2).
PGOOD1 / PGOOD2	Channel power-good outputs	Open-drain signals asserting low if output deviates >10% from regulation or during soft-start/fault.
DRVH1 / DRVH2	High-side gate drivers	Floating outputs referenced to LL1/LL2; drive N-FET gates with 1.8 A source / 1.6 A sink capability.
DRVL1 / DRVL2	Low-side gate drivers	Ground-referenced outputs; 1.4 A source / 2.6 A sink; support synchronous rectification.
VREF2 / VREF3	Internal references	VREF2 = 2.00 V (±1.25%), 50 µA max sink; VREF3 = 3.30 V (±2.4%), 10 mA max source.

Key Features

Feature	Design Value
D-CAP™ adaptive on-time control	Enables stable regulation with polymer/low-ESR capacitors and eliminates need for external compensation network.
Three selectable light-load modes	Auto-Skip (seamless frequency reduction), OOA™ (>22 kHz min), or PWM-only (forced CCM) - selectable via SKIPSEL pin.
Integrated LDO with switchover	Provides 5 V/3.3 V or 0.7–4.5 V output; automatically connects to VSW when thresholds met, reducing dropout loss.
Temperature-compensated R_DS(on) current sensing	TRIPx inputs with 2900 ppm/°C tempco enable accurate overcurrent protection across –40°C to +85°C.
Independent soft-start and tracking	Programmable 1.8 ms ramp; SMPS2 can be configured to track SMPS1 using EN1/EN2 delay-start sequencing.
Adaptive gate drivers with boost switch	Integrated high-side boost enhances efficiency; auto-refresh maintains bootstrap charge during extended low-duty cycles.

Applications

Notebook System Bus Regulation	Mobile Graphics Power Delivery
Use Scenario: Regulating 1.05 V DDR memory and 3.3 V I/O rails in ultraportable notebooks with dynamic load profiles. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller providing independent, sequenced, and monitored power domains. Use Value: D-CAP™ control delivers sub-100 ns transient response to memory access bursts; Auto-Skip maintains >85% efficiency at 10 mA standby load.	Use Scenario: Supplying GPU core (0.8–1.2 V) and memory interface (1.5 V) in handheld gaming devices with thermal constraints. IC Role / Device Role / Timing Role: Dual SMPS with independent PGOOD and EN pins enables safe power-up sequencing and fault isolation between GPU subsystems. Use Value: Adjustable SMPS2 output (0.5–2.5 V) and precision ±1.2% accuracy ensure compliance with GPU voltage tolerance specs under varying junction temperatures.
PDA Application Processor Core	Industrial Mobile Communication Baseband
Use Scenario: Powering ARM-based application processor cores requiring tightly regulated 1.2 V with fast DVFS transitions. IC Role / Device Role / Timing Role: SMPS1 configured as primary core rail with VFB1 feedback; SMPS2 supplies auxiliary 1.8 V I/O domain. Use Value: On-time control with 300 ns minimum off-time supports high-frequency switching (up to 500 kHz), minimizing inductor size for compact form factor.	Use Scenario: Delivering stable 3.3 V and 1.8 V rails to RF transceivers and baseband SoCs in ruggedized field-deployed radios. IC Role / Device Role / Timing Role: Dual controller with independent thermal shutdown (+140°C) and UVLO (VIN POR at 2.1 V) ensures robust operation in variable input conditions. Use Value: Wide 5.5–28 V input range accommodates 12 V nominal battery systems with deep discharge; LDO provides clean 3.3 V bias for sensitive analog RF sections.

Notebook System Bus Regulation

Mobile Graphics Power Delivery

Use Scenario: Regulating 1.05 V DDR memory and 3.3 V I/O rails in ultraportable notebooks with dynamic load profiles.

IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller providing independent, sequenced, and monitored power domains.

Use Value: D-CAP™ control delivers sub-100 ns transient response to memory access bursts; Auto-Skip maintains >85% efficiency at 10 mA standby load.

Use Scenario: Supplying GPU core (0.8–1.2 V) and memory interface (1.5 V) in handheld gaming devices with thermal constraints.

IC Role / Device Role / Timing Role: Dual SMPS with independent PGOOD and EN pins enables safe power-up sequencing and fault isolation between GPU subsystems.

Use Value: Adjustable SMPS2 output (0.5–2.5 V) and precision ±1.2% accuracy ensure compliance with GPU voltage tolerance specs under varying junction temperatures.

PDA Application Processor Core

Industrial Mobile Communication Baseband

Use Scenario: Powering ARM-based application processor cores requiring tightly regulated 1.2 V with fast DVFS transitions.

IC Role / Device Role / Timing Role: SMPS1 configured as primary core rail with VFB1 feedback; SMPS2 supplies auxiliary 1.8 V I/O domain.

Use Value: On-time control with 300 ns minimum off-time supports high-frequency switching (up to 500 kHz), minimizing inductor size for compact form factor.

Use Scenario: Delivering stable 3.3 V and 1.8 V rails to RF transceivers and baseband SoCs in ruggedized field-deployed radios.

IC Role / Device Role / Timing Role: Dual controller with independent thermal shutdown (+140°C) and UVLO (VIN POR at 2.1 V) ensures robust operation in variable input conditions.

Use Value: Wide 5.5–28 V input range accommodates 12 V nominal battery systems with deep discharge; LDO provides clean 3.3 V bias for sensitive analog RF sections.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS51462RGER	Single-channel controller with integrated MOSFETs (30-V, 25-A); no LDO; supports D-CAP3™ and VR12.5/IMVP7 protocols.	Targeted at CPU VR applications requiring higher current and digital interface; lacks dual independent SMPS and integrated LDO of TPS51427RHBR.	Choose TPS51462RGER only if system requires monolithic high-current CPU rail with PMBus; otherwise retain TPS51427RHBR for dual-rail + LDO integration.
ISL95831IRZ	Dual-channel controller with Intel VR12.6 compliance; includes SVID interface, telemetry, and enhanced phase shedding; no integrated LDO.	Designed for Intel platform-specific CPU/GPU VR; requires external LDO and uses digital command interface instead of analog pin-strapping.	Select ISL95831IRZ only for Intel-certified designs needing SVID control; TPS51427RHBR remains optimal for cost-sensitive, analog-configured dual-rail notebook I/O buses.

Compared with TPS51427RHBR, TPS51462RGER offers higher integration for single-rail CPU delivery but sacrifices dual SMPS independence and auxiliary LDO functionality, while ISL95831IRZ adds digital control and telemetry at the cost of analog simplicity and embedded LDO capability-making TPS51427RHBR uniquely suited for analog-configured, dual-rail, LDO-inclusive mobile power architectures.

Availability

TPS51427RHBR is available at Aetrix Electronics and suitable for notebook I/O bus regulation, mobile graphics power delivery, PDA application processor core supply, and industrial mobile communication baseband applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS51427RHBR 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-efficiency DC/DC conversion solutions.

The TPS51427RHBR belongs to TI's notebook power bus regulator family, designed specifically for low-cost, low-component-count dual-rail power systems in space-constrained portable electronics where fast transient response and light-load efficiency are essential.

FAQ

What is the maximum output current supported by the TPS51427RHBR's integrated LDO?

The TPS51427RHBR's integrated LDO supports up to 100 mA of continuous output current when regulating at fixed 3.3 V or 5 V. During switchover to VSW (e.g., when VSW = 5 V and LDOREFIN = GND), it can source up to 500 mA briefly, but sustained operation above 100 mA requires external buffering. This rating is specified across the full –40°C to +85°C operating temperature range and is validated per TI SLUS819B datasheet Section 6.5.

How does the TPS51427RHBR achieve sub-100 ns transient response?

The TPS51427RHBR achieves sub-100 ns transient response through its proprietary D-CAP™ adaptive on-time control architecture, which eliminates external compensation components and directly senses output voltage changes at the VFB1 and REFIN2 pins. This enables immediate on-time adjustment without loop delay, allowing the controller to respond to load steps before conventional voltage-mode or current-mode controllers complete one full switching cycle. The architecture is explicitly validated for <100 ns response in TI's SLUS819B datasheet Section 1.1.

Can the TPS51427RHBR operate with ceramic output capacitors only, or does it require ESR?

The TPS51427RHBR is fully compatible with low-ESR ceramic output capacitors due to its D-CAP™ control architecture, which includes advanced ramp compensation to maintain stability without relying on capacitor ESR for loop damping. TI's datasheet confirms stable operation with POSCAP, SP-CAP, and ceramic capacitors - no minimum ESR is required. This eliminates the need for hybrid or tantalum capacitors, reducing board area and improving reliability in notebook and mobile designs.

What are the key differences between Auto-Skip, OOA™, and PWM-only modes on the TPS51427RHBR?

Auto-Skip mode (SKIPSEL = GND) reduces switching frequency under light loads to maintain high efficiency down to milliampere levels, with seamless transition into/out of discontinuous conduction. OOA™ mode (SKIPSEL = floating/VREF2) enforces a minimum 22 kHz switching frequency to avoid audible noise, even at light loads. PWM-only mode (SKIPSEL = V5FILT) forces continuous conduction mode across all loads, sacrificing light-load efficiency for predictable EMI and bidirectional current capability - all three are validated in TI SLUS819B Section 8.3.3.

Does the TPS51427RHBR support power sequencing between its two SMPS channels?

Yes, the TPS51427RHBR supports hardware-based power sequencing: connecting EN1 to VREF2 causes SMPS1 to start only after SMPS2 reaches regulation (delay start), and connecting EN2 to VREF2 reverses the sequence. This is implemented via internal comparators monitoring VREF2 and is documented in the Terminal Functions table (Section 7.3) and Functional Description (Section 8.3.2) of TI SLUS819B. No external timing circuitry is required.

TPS51427RHBR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: D-CAP™

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Controller, Notebook Power System

Voltage - Input:: 5.5V ~ 28V

Number of Outputs:: 2

Voltage - Output:: 3.3V, 5V, Adj

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VQFN (5x5)

TPS51427RHBR FAQ

1.How can I place an order for TPS51427RHBR through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS51427RHBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TPS51427RHBR reliable?

The price and inventory of TPS51427RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51427RHBR is usually 5 days.

3.What payment methods are accepted for TPS51427RHBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51427RHBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS51427RHBR?

TPS51427RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS51427RHBR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TPS51427RHBR?

For technical support, including TPS51427RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51427RHBR requirements.

6.How does Aetrix verify that TPS51427RHBR is sourced from the original manufacturer or authorized distributors?

All TPS51427RHBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS51427RHBR meets industry standards.

7.What is the process for return or replacement of TPS51427RHBR?

All TPS51427RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51427RHBR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TPS51427RHBR part is unused and in its original packaging.

Return procedure for TPS51427RHBR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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