My Inquiry
My Account
Microchip Technology MIC28516T-E/PHA
- Part No.:
- MIC28516T-E/PHA
- Manufacturer:
- Microchip Technology
- Package:
- 32-PowerVQFN
- Datasheet:
-
MIC28516T-E/PHA.pdf
- Description:
- IC REG BUCK ADJ 8A 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:16,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC28516T-E/PHA from Microchip Technology is a synchronous buck regulator with Hyper Speed Control® adaptive on-time architecture, operating from 4.5V to 70V input and delivering up to 8A output current at adjustable 0.6V–32V with ±1% feedback accuracy. It integrates dual 18 mΩ internal MOSFETs, supports pre-biased start-up, and targets high-VIN/low-VOUT conversion in industrial power supplies.
For engineers reviewing the MIC28516T-E/PHA datasheet, MIC28516T-E/PHA pinout, MIC28516T-E/PHA application, or MIC28516T-E/PHA equivalent, key selection considerations include its 270–800 kHz programmable switching frequency, internal bootstrap diode, auxiliary EXTVDD LDO for efficiency optimization, hiccup-mode short-circuit protection, and thermal shutdown with +150°C trip point.
Technical Context
The MIC28516T-E/PHA implements an adaptive on-time control architecture that combines fixed-frequency predictability with ultra-fast transient response-enabling stable operation with minimal output capacitance even under high input-to-output voltage ratios (e.g., 70V → 0.6V). Its internal compensation eliminates external loop components.
It features dual independent power domains: PVIN (4.5–70V) powers the high-side driver and power stage, while SVIN feeds the internal 4.8–5.4V VDD bias rail via a dedicated 2Ω series resistor. The EXTVDD pin allows bypassing the internal HV LDO to improve system efficiency when an external ≥4.7V supply is available.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 70V - supports wide-range industrial and solar inputs without external pre-regulation |
| Output Current | Up to 8A - sufficient for point-of-load regulation in distributed power systems |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures precise output regulation across full temperature range |
| Switching Frequency | 270 kHz to 800 kHz - adjustable via FREQ pin to optimize EMI, size, and efficiency trade-offs |
| RDS(ON) (HS/LS) | 18 mΩ each - low conduction loss enables >95% peak efficiency at 5V/8A |
| Soft Start Time | 5 ms to 100 ms - programmable via SS capacitor to limit inrush current during power-up |
| Junction Temp Range | –40°C to +125°C - rated for harsh industrial and automotive under-hood environments |
Pinout & Package
Package: 32-lead, 6 mm × 6 mm VQFN with exposed thermal pad (pin 1 marked by dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Connects to SW through resistor to set overcurrent threshold (5.75–6.75A typical) |
| PGND (Pins 2,16–19,22,29) | Power ground return | Low-impedance path for high-current switch node and input/output capacitors; must be separated from AGND |
| SW (Pins 3,12–15,20) | Switch node | Connection point for inductor; carries full switching current and high dv/dt transients |
| BST | Bootstrap voltage output | Drives high-side MOSFET gate; requires 0.1 µF capacitor to SW for gate drive integrity |
| PVIN (Pins 5–11) | Main input power supply | High-voltage input rail (4.5–70V); multiple pins reduce IR drop and thermal stress |
| EN | Enable control input | CMOS-compatible logic input (1.6V high, ≤0.6V low); controls startup/shutdown and reduces quiescent current to 0.15 µA |
| FREQ | Frequency programming input | Resistor-divider or direct connection to PVIN sets switching frequency between 270–800 kHz |
| SS | Soft start timing input | Capacitor to AGND sets soft-start duration (5–100 ms); prevents output overshoot and inrush |
| FB | Feedback voltage sense | Regulated to 0.6V reference; used with resistor divider to set output voltage from 0.6V to 32V |
| AGND | Analog ground reference | Reference for control circuitry; must connect to PGND at single point to avoid noise coupling |
| VDD | Bias supply input | 4.5–5.5V supply for internal logic and reference; requires local 2.2 µF ceramic capacitor |
| SVIN | Internal regulator input | Connected to PVIN via 2Ω resistor; powers VDD rail and requires 1 µF decoupling to AGND |
| PG | Open-drain Power Good | Asserts low when VOUT drops below 90% of target; requires external 10 kΩ pull-up to VDD |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control® Architecture | Enables stable operation with zero-ESR to high-ESR output capacitors and supports 70V→0.6V conversion without instability |
| Any Capacitor™ Stability | No external compensation required - works with ceramic, tantalum, or electrolytic output caps without phase-margin tuning |
| Programmable Current Limit | Adjustable 5.75–6.75A threshold via ILIM resistor - protects downstream loads and power stage during faults |
| Auxiliary EXTVDD LDO | Bypasses internal HV LDO when supplied ≥4.7V externally - improves light-load efficiency by reducing VDD quiescent current |
| Hiccup-Mode Short-Circuit Protection | Shuts down and auto-retries after fault - prevents thermal runaway during sustained overload or short conditions |
| Safe Pre-Biased Start-Up | Allows controlled ramp-up into existing output voltage - avoids reverse current flow and potential damage to downstream circuits |
Applications
| Distributed Power Systems | Communications Infrastructure |
|---|---|
Use Scenario: Point-of-load regulation in 48V telecom rack systems powering ASICs and FPGAs. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering regulated 1.2V/3.3V/5V/12V rails from 48V backplane. Use Value: High 95% efficiency at 8A reduces heat sink requirements; programmable soft start prevents bus droop during hot-swap insertion. | Use Scenario: Midspan power sourcing for PoE++ switches and base station RF modules. IC Role / Device Role / Timing Role: High-input-voltage DC/DC stage converting 57V PoE++ input to isolated 12V intermediate bus. Use Value: 70V absolute max rating accommodates surge transients; hiccup-mode protection maintains uptime during cable fault events. |
| Industrial Power Supplies | Solar Energy Systems |
Use Scenario: DIN-rail mounted 24V/48V industrial PLC power module supplying I/O and controller rails. IC Role / Device Role / Timing Role: Main step-down regulator accepting wide-range unregulated DC from rectified AC or battery banks. Use Value: –40°C to +125°C junction rating ensures reliability in enclosed cabinets; internal MOSFETs eliminate external component count. | Use Scenario: MPPT charge controller front-end converting variable PV array output (up to 70V) to stable 24V/48V battery bus. IC Role / Device Role / Timing Role: High-efficiency non-isolated buck stage handling up to 8A continuous current from solar panels. Use Value: Adjustable 0.6V–32V output supports diverse battery chemistries; Any Capacitor™ stability simplifies design with low-cost bulk electrolytics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1A output, integrated 0.58Ω HS/LS FETs; no EXTVDD pin or pre-biased start-up | Targeted at lower-current automotive body electronics; lacks 8A capability and high-VIN robustness | Select MIC28516T-E/PHA for >4A loads, >65V inputs, or where EXTVDD efficiency boost is critical |
| MPQ4333GQ-A | 4.5–60V input, 6A output, 22 mΩ RDS(ON), no ILIM pin or hiccup-mode protection | Cost-optimized for consumer-grade industrial SMPS; missing programmable current limit and robust fault recovery | Choose MIC28516T-E/PHA when 8A output, ±1% FB accuracy, or hiccup-mode short-circuit protection is required |
Compared with LM5164QPWPRQ1 and MPQ4333GQ-A, the MIC28516T-E/PHA delivers higher output current (8A vs. 1A/6A), wider input range (70V vs. 65V/60V), tighter feedback accuracy (±1% vs. ±1.5%), and unique features including EXTVDD efficiency enhancement and safe pre-biased start-up-making it suitable for demanding industrial and infrastructure applications.
Availability
MIC28516T-E/PHA is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and industrial power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MIC28516T-E/PHA 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 leading provider of microcontrollers, analog devices, and power management ICs, serving industrial, automotive, and communications markets with high-reliability semiconductor solutions.
The MIC28516 product line is designed for high-input-voltage synchronous buck conversion in ruggedized power systems-emphasizing wide VIN range, integrated protection, and layout-friendly thermal performance in compact VQFN packages.
FAQ
What is the maximum input voltage rating for the MIC28516T-E/PHA?
The MIC28516T-E/PHA has an absolute maximum input voltage rating of +71V on PVIN and SVIN pins relative to PGND, with a recommended operating range of 4.5V to 70V. This allows reliable use in 48V telecom, solar array, and industrial DC bus applications where transient surges may exceed nominal voltage levels. Exceeding 71V risks permanent device damage.
Does the MIC28516T-E/PHA support pre-biased output start-up?
Yes, the MIC28516T-E/PHA explicitly supports safe start-up into a pre-biased output voltage. Its control architecture prevents reverse current flow during initial ramp-up, protecting downstream components. This feature is confirmed in the datasheet's General Description and validated in Figure 2-41 (VIN Start-up Pre-Biased Output), making MIC28516T-E/PHA suitable for hot-swap and redundant power systems.
How is the switching frequency programmed on the MIC28516T-E/PHA?
The MIC28516T-E/PHA switching frequency is programmed via the FREQ pin: connecting it directly to PVIN sets 800 kHz, while a resistor divider from PVIN to AGND adjusts frequency linearly from 270 kHz to 800 kHz. The relationship is specified in Table 1-1 and Section 5.1 of the datasheet, with typical values verified across temperature and input voltage ranges in Figures 2-32 and 2-33.
What is the purpose of the EXTVDD pin on the MIC28516T-E/PHA?
The EXTVDD pin on the MIC28516T-E/PHA accepts an external ≥4.7V supply to bypass the internal high-voltage LDO, reducing power dissipation and improving light-load efficiency. When unused, it must be left floating or grounded. Its switchover voltage is 4.4–4.8V with 0.2V hysteresis, and it requires a 2.2 µF ceramic capacitor to PGND if enabled-details are in Table 1-1 and Section 3.0 Pin Descriptions.
Can the MIC28516T-E/PHA operate with ceramic output capacitors only?
Yes, the MIC28516T-E/PHA is Any Capacitor™ stable and fully compatible with ceramic-only output capacitor designs. Its internal compensation and Hyper Speed Control® architecture eliminate the need for ESR-based zero placement, enabling stable regulation with zero-ESR ceramics-verified across load, line, and temperature in datasheet Figures 2-4–2-12 and confirmed in the Features list on page 1.
MIC28516T-E/PHA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Hyper Speed Control®
- Package/Case:
- 32-PowerVQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 70V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 8A
- Frequency - Switching:
- 270kHz ~ 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VQFN (6x6)
MIC28516T-E/PHA FAQ
1.How can I place an order for MIC28516T-E/PHA through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28516T-E/PHA 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 MIC28516T-E/PHA reliable?
The price and inventory of MIC28516T-E/PHA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28516T-E/PHA is usually 5 days.
3.What payment methods are accepted for MIC28516T-E/PHA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28516T-E/PHA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28516T-E/PHA?
MIC28516T-E/PHA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28516T-E/PHA 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 MIC28516T-E/PHA?
For technical support, including MIC28516T-E/PHA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28516T-E/PHA requirements.
6.How does Aetrix verify that MIC28516T-E/PHA is sourced from the original manufacturer or authorized distributors?
All MIC28516T-E/PHA 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 MIC28516T-E/PHA meets industry standards.
7.What is the process for return or replacement of MIC28516T-E/PHA?
All MIC28516T-E/PHA units undergo pre-shipment inspection (PSI). If there is an issue with MIC28516T-E/PHA, 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 MIC28516T-E/PHA part is unused and in its original packaging.
Return procedure for MIC28516T-E/PHA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC28516T-E/PHA Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
