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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Microchip Technology MIC23051-945YML-TR

Name: MIC23051-945YML-TR
Brand: Microchip Technology
SKU: MIC23051-945YML-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC23051-945YML-TR

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VFDFN Exposed Pad, 8-MLF®

Datasheet:: MIC23051-945YML-TR.pdf

Description:: IC REG BUCK 1.25V 600MA 8MLF

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Product details

Overview

MIC23051-945YML-TR from Microchip Technology is a 4 MHz synchronous buck (step-down) DC-DC regulator with HyperLight Load® architecture, delivering up to 600 mA output current at fixed dual-voltage scaling: 0.95 V (VSC low) and 1.25 V (VSC high). It operates from 2.7 V to 5.5 V input, achieves >93% peak efficiency, and maintains 25 mV_PP ripple in HyperLight Load® mode - ideal for powering core logic and I/O rails in space-constrained portable electronics.

For engineers reviewing the MIC23051-945YML-TR datasheet, MIC23051-945YML-TR pinout, MIC23051-945YML-TR application, or MIC23051-945YML-TR equivalent, key selection considerations include its 2 mm × 2 mm DFN package, ultra-low 20 µA quiescent current, voltage-scaling control via VSC pin, and compatibility with 0.47–2.2 µH inductors for sub-1 mm height power solutions.

Technical Context

The MIC23051-945YML-TR implements a proprietary minimum on-time/off-time control loop enabling pulse-frequency modulation (PFM) at light loads and seamless transition to constant-frequency 4 MHz PWM at higher loads. Its HyperLight Load® architecture eliminates the trade-off between light-load efficiency and transient response by maintaining fast control-loop speed without sacrificing standby current.

This device integrates PMOS/NMOS synchronous switches with R_DS(ON) of 0.45 Ω (PMOS) and 0.5 Ω (NMOS), supports feed-forward compensation via CFF pin (560 pF), and uses SNS feedback directly tied to V_OUT for precise regulation - all within a single 8-pin DFN package rated for –40°C to +125°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7 V to 5.5 V - supports single-cell Li-ion, USB, and 3.3 V/5 V system rails without external LDO pre-regulation.
Output Voltage Options	0.95 V (VSC = low) / 1.25 V (VSC = high) - enables dynamic core voltage scaling for low-power processors and FPGAs.
Max Output Current	600 mA - sufficient for powering ARM Cortex-M cores, RF transceivers, or sensor hubs in portable designs.
Quiescent Current	20 µA typical - extends battery life in always-on or sleep-mode applications such as Bluetooth LE peripherals.
Switching Frequency	4 MHz nominal - allows use of ultra-small 0.47–2.2 µH inductors and minimizes EMI filtering requirements.
Output Ripple	25 mV_PP in HyperLight Load® mode - meets noise-sensitive analog supply requirements without additional LC filtering.
Efficiency	>93% peak; ~85% at 1 mA - delivers best-in-class light-load efficiency for intermittent-duty systems like wearables.

Pinout & Package

Package: 8-pin 2 mm × 2 mm DFN with exposed thermal pad (EP), RoHS-compliant, –40°C to +125°C junction temperature rating.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch node output	Connects to inductor; carries high-frequency pulsed current - requires short, low-inductance routing away from sensitive nodes.
2 EN	Enable input	Logic-high (>0.5 V) activates regulator; includes soft-start and <4 µA shutdown current - must not be left floating.
3 VSC	Voltage scaling control	Logic level selects output: low = 0.95 V, high = 1.25 V - threshold 0.5–1.2 V with 20 mV hysteresis.
4 SNS	Output voltage sense	Direct connection to V_OUT; high-impedance input (<1 µA) - routed away from SW to avoid noise coupling.
5 CFF	Feed-forward capacitor node	Accepts 560 pF capacitor to SNS; internal reference = 0.72 V - critical for stability and transient response.
6 AGND	Analog ground	Reference for control circuitry; separate from PGND to prevent switching noise injection into error amplifier.
7 VIN	Power input	Supplies MOSFETs and bias circuits; requires ≥2.2 µF ceramic bypass capacitor close to PGND.
8 PGND	Power ground	High-current return path for switch node; must form compact loop with VIN and SW to minimize EMI.

Key Features

Feature	Design Value
HyperLight Load® architecture	Enables PFM-to-PWM transition without sacrificing control speed - achieves 20 µA I_Q while maintaining <800 µs output transition time during VSC toggling.
Voltage scaling via VSC pin	Hardware-selectable dual-output configuration (0.95 V / 1.25 V) eliminates need for external DAC or GPIO-controlled resistive dividers.
4 MHz fixed-frequency PWM	Supports ultra-compact magnetics (0.47 µH minimum); reduces output capacitor size and enables PCB area savings in dense layouts.
Integrated synchronous MOSFETs	0.45 Ω PMOS + 0.5 Ω NMOS switches eliminate external diode losses - improves full-load efficiency and thermal performance.
Feed-forward compensation (CFF)	560 pF capacitor on CFF pin enhances load-transient response and stabilizes operation across 0.47–2.2 µH inductor range.

Applications

Mobile Baseband Processors	USB-Powered IoT Sensors
Use Scenario: Powering ARM-based application processors in smartphones and feature phones requiring dynamic voltage scaling between active and idle states. IC Role / Device Role / Timing Role: Primary core voltage regulator with hardware-controlled VSC pin toggling to match CPU DVFS states. Use Value: Delivers 0.95 V / 1.25 V outputs with <25 mV_PP ripple and 20 µA quiescent current - extends battery runtime without compromising wake-up latency.	Use Scenario: Supplying regulated 1.25 V to ultra-low-power microcontrollers and 0.95 V to BLE radio subsystems in USB-powered environmental sensors. IC Role / Device Role / Timing Role: Dual-rail DC-DC converter providing independent, dynamically scalable supplies from 5 V USB input. Use Value: Enables simultaneous low-noise analog sensing (1.25 V) and energy-efficient wireless transmission (0.95 V) using a single IC and minimal external components.
Wi-Fi/WiMAX Module Power	Portable Media Player SoCs
Use Scenario: Powering 2.4 GHz/5 GHz Wi-Fi modules with bursty transmit/receive current profiles and strict EMI limits. IC Role / Device Role / Timing Role: High-frequency buck regulator supplying 1.25 V to RF transceiver ICs and baseband logic. Use Value: 4 MHz switching frequency shifts noise spectrum above sensitive IF bands; 25 mV_PP ripple prevents RF desensitization during receive mode.	Use Scenario: Regulating core voltage for multimedia SoCs in MP3 players and digital audio recorders operating from single-cell lithium batteries. IC Role / Device Role / Timing Role: Main system regulator supporting both high-performance decode (1.25 V) and low-power playback (0.95 V) modes. Use Value: Achieves >85% efficiency at 1 mA idle current and >93% at full load - maximizes playtime while minimizing thermal dissipation in sealed enclosures.

Mobile Baseband Processors

USB-Powered IoT Sensors

Use Scenario: Powering ARM-based application processors in smartphones and feature phones requiring dynamic voltage scaling between active and idle states.

IC Role / Device Role / Timing Role: Primary core voltage regulator with hardware-controlled VSC pin toggling to match CPU DVFS states.

Use Value: Delivers 0.95 V / 1.25 V outputs with <25 mV_PP ripple and 20 µA quiescent current - extends battery runtime without compromising wake-up latency.

Use Scenario: Supplying regulated 1.25 V to ultra-low-power microcontrollers and 0.95 V to BLE radio subsystems in USB-powered environmental sensors.

IC Role / Device Role / Timing Role: Dual-rail DC-DC converter providing independent, dynamically scalable supplies from 5 V USB input.

Use Value: Enables simultaneous low-noise analog sensing (1.25 V) and energy-efficient wireless transmission (0.95 V) using a single IC and minimal external components.

Wi-Fi/WiMAX Module Power

Portable Media Player SoCs

Use Scenario: Powering 2.4 GHz/5 GHz Wi-Fi modules with bursty transmit/receive current profiles and strict EMI limits.

IC Role / Device Role / Timing Role: High-frequency buck regulator supplying 1.25 V to RF transceiver ICs and baseband logic.

Use Value: 4 MHz switching frequency shifts noise spectrum above sensitive IF bands; 25 mV_PP ripple prevents RF desensitization during receive mode.

Use Scenario: Regulating core voltage for multimedia SoCs in MP3 players and digital audio recorders operating from single-cell lithium batteries.

IC Role / Device Role / Timing Role: Main system regulator supporting both high-performance decode (1.25 V) and low-power playback (0.95 V) modes.

Use Value: Achieves >85% efficiency at 1 mA idle current and >93% at full load - maximizes playtime while minimizing thermal dissipation in sealed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MIC23050-945YML-TR	Same pinout and voltage options, but lacks HyperLight Load® - higher 80 µA I_Q and slower light-load transient response.	Suitable only where continuous 4 MHz operation is preferred over adaptive PFM/PWM; less optimal for battery-critical designs.	Select MIC23050-945YML-TR only if deterministic switching frequency is required across entire load range.
TPS6286518RTER	1.8 V fixed output (non-scaling), 1.2 A capability, 2.5 V–5.5 V input, 15 µA I_Q, but no VSC pin or dual-voltage support.	Applicable for fixed-voltage 1.8 V rails only; cannot replace MIC23051-945YML-TR's dynamic scaling function.	Choose TPS6286518RTER when higher current and lower I_Q are needed for static 1.8 V loads - not a functional substitute for voltage scaling.

Compared with MIC23050-945YML-TR, the MIC23051-945YML-TR delivers superior light-load efficiency and faster load transients due to HyperLight Load®; versus TPS6286518RTER, it provides unique hardware-based dual-voltage scaling but at lower current rating - making it irreplaceable for DVFS-enabled portable SoCs.

Availability

MIC23051-945YML-TR is available at Aetrix Electronics and suitable for cellular phones, USB-powered IoT sensors, Wi-Fi modules, and portable media players requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MIC23051-945YML-TR 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and embedded system integration.

The MIC23051 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing dynamic voltage scaling, minimal external component count, and robust light-load performance.

FAQ

What is the exact output voltage configuration of the MIC23051-945YML-TR?

The MIC23051-945YML-TR provides two factory-set output voltages: 0.95 V when the VSC pin is logic low, and 1.25 V when VSC is logic high. These values are fixed per the marking code "945" and do not require external feedback resistors - the MIC23051-945YML-TR achieves this through internal resistor networks calibrated during manufacturing.

Does the MIC23051-945YML-TR require an external feed-forward capacitor?

Yes, the MIC23051-945YML-TR requires a 560 pF ceramic capacitor connected between the CFF and SNS pins. This capacitor is essential for stability and transient response optimization across the supported inductor range (0.47–2.2 µH); omitting it may cause oscillation or degraded load-step performance in the MIC23051-945YML-TR.

What is the recommended inductor value for the MIC23051-945YML-TR in a typical 1.25 V application?

A 1 µH inductor is recommended for the MIC23051-945YML-TR in most applications, balancing transient response, efficiency, and output ripple. For faster load steps, use 0.47 µH; for lower ripple at full load, select 2.2 µH - all values are validated and supported without compensation changes in the MIC23051-945YML-TR.

Can the MIC23051-945YML-TR operate with input voltage below 2.7 V?

No, the MIC23051-945YML-TR has a specified minimum input voltage of 2.7 V and an undervoltage lockout (UVLO) turn-on threshold of 2.55 V (typical). Operation below 2.7 V violates absolute maximum ratings and will result in unregulated output or shutdown - the MIC23051-945YML-TR is not characterized or guaranteed for sub-2.7 V operation.

How does the MIC23051-945YML-TR manage thermal performance in its 2 mm × 2 mm DFN package?

The MIC23051-945YML-TR uses an exposed thermal pad (EP) that must be soldered to a PCB ground plane with multiple vias to achieve θ_JA = 90°C/W. At 600 mA load and 3.6 V input, junction temperature rise remains within –40°C to +125°C range when layout guidelines (e.g., thermal pad connection, PGND copper area) are followed for the MIC23051-945YML-TR.

MIC23051-945YML-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: HyperLight Load®

Package/Case:: 8-VFDFN Exposed Pad, 8-MLF®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: -

Current - Output:: 600mA

Frequency - Switching:: 4MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MLF® (2x2)

MIC23051-945YML-TR FAQ

1.How can I place an order for MIC23051-945YML-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC23051-945YML-TR 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 MIC23051-945YML-TR reliable?

The price and inventory of MIC23051-945YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC23051-945YML-TR is usually 5 days.

3.What payment methods are accepted for MIC23051-945YML-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC23051-945YML-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC23051-945YML-TR?

MIC23051-945YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC23051-945YML-TR 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 MIC23051-945YML-TR?

For technical support, including MIC23051-945YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC23051-945YML-TR requirements.

6.How does Aetrix verify that MIC23051-945YML-TR is sourced from the original manufacturer or authorized distributors?

All MIC23051-945YML-TR 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 MIC23051-945YML-TR meets industry standards.

7.What is the process for return or replacement of MIC23051-945YML-TR?

All MIC23051-945YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC23051-945YML-TR, 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 MIC23051-945YML-TR part is unused and in its original packaging.

Return procedure for MIC23051-945YML-TR:

1.Submit a request within 90 days.

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

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