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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Microchip Technology MIC2174C-1YMM

Name: MIC2174C-1YMM
Brand: Microchip Technology
SKU: MIC2174C-1YMM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC2174C-1YMM

Manufacturer:: Microchip Technology

Category:: DC DC Switching Controllers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MIC2174C-1YMM.pdf

Description:: IC REG CTRLR BUCK 10MSOP

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Product details

Overview

MIC2174C-1YMM from Micrel is a synchronous buck controller implementing adaptive on-time control for wide-input DC-DC conversion. It operates from 3V to 40V input, delivers up to 25A output current, regulates down to 0.8V with ±3% FB accuracy, and switches at 270kHz fixed frequency in a 10-pin MSOP package - used in telecom power supplies requiring fast transient response and high-voltage input tolerance.

For engineers reviewing the MIC2174C-1YMM datasheet, MIC2174C-1YMM pinout, MIC2174C-1YMM application, or MIC2174C-1YMM equivalent, key selection considerations include its 270kHz switching frequency (vs. 300kHz for MIC2174), ±3% feedback accuracy, Hyper Speed Control™ architecture enabling ultra-fast load transients, and compatibility with any-output-capacitor stability - critical for industrial and distributed power system designs.

Technical Context

The MIC2174C-1YMM uses an adaptive T_ON ripple-controlled architecture where estimated on-time is calculated as T_ON(est) = V_OUT/V_HSD × 300kHz (clamped at 30V HSD), resulting in a nominal 270kHz switching frequency. Its control loop senses output voltage ripple via the FB pin to trigger on-time periods without slope compensation.

It integrates dual high-current gate drivers (DH and DL) supporting N-channel MOSFETs, implements foldback current limiting using low-side R_DS(ON) sensing with 150ns blanking, and features thermal shutdown at 155°C with 10°C hysteresis - all operating across –40°C to +125°C junction temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 40V on HSD pin; supports wide-range industrial and telecom inputs without pre-regulation
Switching Frequency	270kHz typical; enables compact magnetics while balancing EMI and efficiency trade-offs
Feedback Accuracy	±3% over –40°C to +125°C; defines output voltage tolerance under full thermal and load conditions
Output Voltage Range	0.8V–3.6V when VHSD > 28V; ensures safe operation in high-input/low-output ratio applications like 36V-to-1.8V
Max Output Current	25A capability; determined by external MOSFET selection and PCB thermal design, not internal limits
Operating Temp Range	–40°C to +125°C junction; validated for harsh environments including industrial motor drives and base station power
Package	10-pin MSOP (MAX1954A-compatible); surface-mount footprint with exposed pad for thermal management

Pinout & Package

The MIC2174C-1YMM is housed in a 10-pin MSOP package with exposed thermal pad, compatible with MAX1954A layout standards and rated for –40°C to +125°C junction operation.

Pin/Terminal	Circuit Role	Design Meaning
HSD	High-side MOSFET drain connection	Accepts 3V–40V input; requires local bulk capacitor between HSD and PGND for power integrity
EN	Enable logic input	CMOS-compatible; floating or high = enabled, low = shutdown with 0.8mA standby current
FB	Feedback voltage sense	Regulated to 0.8V reference; sets output via resistor divider; ±3% accuracy impacts final V_OUT tolerance
GND	Signal ground reference	Separate from PGND; must be routed independently to avoid noise coupling into control loop
IN	Bias supply input	3V–5.5V only; powers internal circuitry and gate drivers; must ramp after HSD for correct soft-start behavior
DL	Low-side gate driver output	Drives low-side N-MOSFET gate from GND to IN voltage; 1.2Ω low-state R_DS(ON) supports high-current switching
PGND	Power ground return	Carries high di/dt currents; connects to low-side MOSFET source, input/output cap negatives, and must be low-inductance
DH	High-side gate driver output	Floating driver referenced to LX; swings from GND to V_IN–V_diode; 2.1Ω high-state R_DS(ON) enables efficient high-side turn-on
LX	Switch node & current sense	Connects directly to external switch node; senses low-side R_DS(ON) during off-time for current limiting
BST	Bootstrap capacitor connection	Requires 0.1μF ceramic cap to LX; enables high-side drive above HSD rail via charge pump action

Key Features

Feature	Design Value
Hyper Speed Control™ architecture	Enables sub-10μs load transient recovery and reduces required output capacitance by >30% vs. conventional controllers
Any Capacitor™ stability	Operates stably with zero-ESR ceramic, high-ESR electrolytic, or mixed-output capacitors - eliminates capacitor selection constraints
Adaptive on-time control	Eliminates need for external compensation network and slope compensation; simplifies design and improves light-load efficiency
Foldback current limit + hiccup mode	Protects external MOSFETs and load during short-circuit events without latch-off; resumes operation after fault clears
Safe start-up into pre-biased loads	Prevents reverse current flow during hot-insertion scenarios common in modular power systems and hot-swap applications

Applications

Telecom Power Supply	Industrial Motor Drive PSU
Use Scenario: 48V telecom rectifier output stepped down to 3.3V/5V for baseband processing boards in 5G remote radio units. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, high-transient-load DC-DC conversion with minimal output capacitance. Use Value: Hyper Speed Control™ achieves <15μs recovery from 50% load step, reducing required bulk capacitance by 40% and saving board space.	Use Scenario: Distributed 24V–40V DC bus powering servo amplifier logic and gate drivers in factory automation PLCs. IC Role / Device Role / Timing Role: Adaptive on-time buck controller delivering regulated 1.8V/3.3V rails tolerant of wide input variation and EMI-rich motor drive environments. Use Value: Any Capacitor™ stability allows use of cost-effective aluminum polymer caps instead of expensive low-ESR ceramics, lowering BOM cost by ~$0.35/unit.
Distributed DC Power System	Networking Switch Midplane
Use Scenario: Point-of-load regulation from 12V/24V/48V backplane rails to ASIC core voltages (0.8V–1.2V) in data center switches. IC Role / Device Role / Timing Role: High-voltage input synchronous controller enabling single-stage conversion without intermediate 5V bus, improving overall system efficiency. Use Value: 270kHz fixed frequency enables predictable EMI filtering design; ±3% FB accuracy ensures compliance with tight ASIC V_DD tolerances.	Use Scenario: Hot-swappable line card power management where pre-biased outputs must be safely energized without reverse current. IC Role / Device Role / Timing Role: Controller with safe-start capability and hiccup-mode protection ensuring reliable insertion into live midplane backplanes. Use Value: Pre-bias start-up prevents damage to downstream FPGAs and SerDes; hiccup mode avoids catastrophic failure during connector arcing events.

Telecom Power Supply

Industrial Motor Drive PSU

Use Scenario: 48V telecom rectifier output stepped down to 3.3V/5V for baseband processing boards in 5G remote radio units.

IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, high-transient-load DC-DC conversion with minimal output capacitance.

Use Value: Hyper Speed Control™ achieves <15μs recovery from 50% load step, reducing required bulk capacitance by 40% and saving board space.

Use Scenario: Distributed 24V–40V DC bus powering servo amplifier logic and gate drivers in factory automation PLCs.

IC Role / Device Role / Timing Role: Adaptive on-time buck controller delivering regulated 1.8V/3.3V rails tolerant of wide input variation and EMI-rich motor drive environments.

Use Value: Any Capacitor™ stability allows use of cost-effective aluminum polymer caps instead of expensive low-ESR ceramics, lowering BOM cost by ~$0.35/unit.

Distributed DC Power System

Networking Switch Midplane

Use Scenario: Point-of-load regulation from 12V/24V/48V backplane rails to ASIC core voltages (0.8V–1.2V) in data center switches.

IC Role / Device Role / Timing Role: High-voltage input synchronous controller enabling single-stage conversion without intermediate 5V bus, improving overall system efficiency.

Use Value: 270kHz fixed frequency enables predictable EMI filtering design; ±3% FB accuracy ensures compliance with tight ASIC V_DD tolerances.

Use Scenario: Hot-swappable line card power management where pre-biased outputs must be safely energized without reverse current.

IC Role / Device Role / Timing Role: Controller with safe-start capability and hiccup-mode protection ensuring reliable insertion into live midplane backplanes.

Use Value: Pre-bias start-up prevents damage to downstream FPGAs and SerDes; hiccup mode avoids catastrophic failure during connector arcing events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MIC2174-1YMM	±1% FB accuracy, 300kHz switching frequency, same pinout and package	Better output voltage regulation; preferred for precision analog or FPGA core rails	Select MIC2174-1YMM when tighter than ±3% output tolerance is required and 300kHz EMI profile is acceptable
MP2482DK-LF-Z	Monolithic 2A buck converter (integrated MOSFETs), 4.5–36V input, 340kHz, no external high-side drive	Lower current capability; suited for auxiliary rails, not main POL converters	Choose MP2482DK-LF-Z only for ≤2A applications where board space and simplicity outweigh performance needs

Compared with MIC2174-1YMM, the MIC2174C-1YMM trades ±1% FB accuracy and 300kHz frequency for lower cost and relaxed tolerance requirements, while the MP2482DK-LF-Z offers integration at the expense of current capability and external component flexibility - making MIC2174C-1YMM optimal for cost-sensitive, medium-power industrial POL designs.

Availability

MIC2174C-1YMM is available at Aetrix Electronics and suitable for telecom networking, industrial equipment, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC2174C-1YMM 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

Micrel Inc. was a U.S.-based analog and power IC manufacturer headquartered in San Jose, CA, acquired by Microchip Technology in 2015. Known for high-performance power management and timing solutions.

The MIC2174/MIC2174C belongs to Micrel's Hyper Speed Control™ family of adaptive on-time buck controllers, designed specifically for high-input-voltage, fast-transient industrial and telecom power conversion where traditional voltage-mode or current-mode control falls short.

FAQ

What is the switching frequency of the MIC2174C-1YMM and how does it vary with input voltage?

The MIC2174C-1YMM has a nominal switching frequency of 270kHz. This frequency remains stable across load and temperature but decreases slightly when the HSD input voltage exceeds 30V due to internal clamping in the fixed T_ON estimation block - for example, at VHSD = 36V, actual f_SW drops to approximately 250kHz. The datasheet specifies 202–338kHz over full operating conditions.

How does the MIC2174C-1YMM achieve current limiting without a sense resistor?

The MIC2174C-1YMM senses current through the R_DS(ON) of the external low-side N-channel MOSFET during its off-time, comparing the resulting voltage drop against an internal 130mV (typical) threshold. This method eliminates the need for a discrete current-sense resistor, reducing cost, board area, and power loss - and is implemented with 150ns blanking to avoid false triggering during switching transitions.

Can the MIC2174C-1YMM safely start up into a pre-biased output?

Yes, the MIC2174C-1YMM includes built-in safe start-up into pre-biased loads. Its control logic prevents reverse current flow by disabling the high-side driver until the FB voltage rises above the 0.8V reference, avoiding potential damage to downstream circuitry - a critical feature for hot-swap applications in telecom and networking equipment using the MIC2174C-1YMM.

What is the purpose of the BST pin on the MIC2174C-1YMM and what external components are required?

The BST pin on the MIC2174C-1YMM provides the bootstrapped voltage for driving the high-side N-channel MOSFET gate above the switch-node (LX) potential. It requires a 0.1μF ceramic capacitor connected between BST and LX, plus an external Schottky diode from IN to BST - enabling efficient high-side conduction without requiring a separate high-voltage bias supply.

Why does the MIC2174C-1YMM specify different output voltage ranges depending on HSD voltage?

The MIC2174C-1YMM limits maximum adjustable output to 3.6V when VHSD > 28V to maintain stable operation and prevent degradation of line regulation caused by increased internal ripple injection at high input-to-output ratios. At VHSD ≤ 28V, the full 0.8V–5.5V range is supported - this constraint ensures robust control loop behavior and avoids instability in demanding applications like 36V-to-3.3V conversion using the MIC2174C-1YMM.

MIC2174C-1YMM Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: Hyper Speed Control®

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 3V ~ 40V

Frequency - Switching:: 270kHz

Duty Cycle (Max):: 87%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MIC2174C-1YMM FAQ

1.How can I place an order for MIC2174C-1YMM through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC2174C-1YMM 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 MIC2174C-1YMM reliable?

The price and inventory of MIC2174C-1YMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2174C-1YMM is usually 5 days.

3.What payment methods are accepted for MIC2174C-1YMM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2174C-1YMM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC2174C-1YMM?

MIC2174C-1YMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC2174C-1YMM 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 MIC2174C-1YMM?

For technical support, including MIC2174C-1YMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2174C-1YMM requirements.

6.How does Aetrix verify that MIC2174C-1YMM is sourced from the original manufacturer or authorized distributors?

All MIC2174C-1YMM 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 MIC2174C-1YMM meets industry standards.

7.What is the process for return or replacement of MIC2174C-1YMM?

All MIC2174C-1YMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2174C-1YMM, 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 MIC2174C-1YMM part is unused and in its original packaging.

Return procedure for MIC2174C-1YMM:

1.Submit a request within 90 days.

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

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