MIC28516T-E/PHA - 70V/8A Sync Buck Regulator | Microchip
N.º da peça: MIC28516T-E/PHA ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.1 | $4,10 |
| 10 | $3.69 | $36,90 |
| 100 | $3.3 | $330,00 |
| 500 | $2.95 | $1.475,00 |
| 1.000 | $2.73 | $2.730,00 |
MIC28516T-E/PHA Visão geral
A buck regulator (step-down switching converter) is a power management IC that efficiently converts a higher DC input voltage to a lower DC output voltage using high-speed switching of integrated power MOSFETs and energy storage in an external inductor and capacitor. Within the broader power management hierarchy, buck regulators sit under DC-DC converters, which themselves belong to the power management IC (PMIC) family. The synchronous topology replaces the traditional Schottky rectifier with a low-side FET, dramatically improving efficiency at high output currents.
Key specifications include 8A continuous output current, 4.5V-70V wide input range, 0.6V-32V adjustable output, and Hyper Speed Control that delivers ultra-fast transient response without the loop-compensation complexity of classical voltage-mode controllers. Additional features include external soft-start, internal high-side bootstrap switch, thermal-shutdown, input undervoltage lockout, and a PGOOD indicator. The 32-VQFN exposed-pad package provides a low thermal-resistance path for dissipating power at full 8A load.
Internally, the MIC28516 uses Microchip's enhanced adaptive on-time Constant On-Time (COT) controller co-packaged with a pair of low figure-of-merit N-Channel trench MOSFETs. This architecture eliminates the need for external compensation components and achieves fast transient response by modulating the on-time based on input voltage, output voltage, and desired switching frequency - typically 200 kHz to 1 MHz adjustable.
Typical applications include industrial 24V/48V point-of-load regulation, telecom and networking equipment power, automotive 12V/24V accessory rails, battery-powered systems up to 60V, distributed power architectures, and general-purpose wide-Vin step-down conversion. Designers value this part when they need a high-current, wide-Vin buck in a compact thermally-enhanced package without writing a compensation network.
When designing, choose the external feedback resistor divider for the desired output, size the inductor for 20-40% peak-to-peak ripple, and use ceramic output capacitors with low ESR. The exposed pad must be soldered to a sufficient copper pour (typically 1 sq inch minimum) to keep junction temperature within the 125C operating limit at full 8A load.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical PCB layout/design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para MIC28516T-E/PHA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MIC28517T-E/PHA
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MIC28516T-E/PHATR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MIC28516T-E/PHA
✅ Drop-In✓ Em estoque
$2.73 / unidade
Ver ficha técnica →MIC28516T-E/PHA Classificações máximas e características elétricas
| Topologia | Synchronous Buck (Step-Down) |
| Faixa de tensão de entrada | 4.5 V to 70 V |
| Faixa de tensão de saída | 0.6 V to 32 V (Adjustable) |
| Output Current | 8 A (continuous) |
| Output Voltage Accuracy | ±1% |
| Switching Frequency Range | 200 kHz to 1 MHz (adjustable) |
| Control Architecture | Hyper Speed Control (Adaptive On-Time COT) |
| Integrated Switches | Yes - High-side and Low-side N-Channel FETs |
| Soft-start | External programmable |
| Feedback Voltage Reference | 0.6 V |
| Faixa de temperatura de operação | -40 C to +125 C |
| Encapsulamento | 32-pin VQFN-EP (Power VQFN) |
| Package Dimensions | 5 x 5 mm |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (per Arrow/EOL listings) |
| Protection Features | Thermal Shutdown, Input UVLO, Short-Circuit, Cycle-by-Cycle Current Limit |
| Power Good (PGOOD) Output | Yes |
Configuração de pinos do MIC28516T-E/PHA
| Pino 1 | VIN — Input supply voltage (4.5V to 70V) |
| Pino 2 | VIN — Input supply voltage |
| Pino 3 | VIN — Input supply voltage |
| Pino 4 | VIN — Input supply voltage |
| Pino 5 | EN — Enable input (active high) |
| Pino 6 | BST — Bootstrap for high-side gate driver |
| Pino 7 | SW — Switch node (output inductor connection) |
| Pino 8 | SW — Switch node |
| Pino 9 | SW — Switch node |
| Pino 10 | SW — Switch node |
| Pino 11 | PGND — Power ground return |
| Pino 12 | PGND — Power ground return |
| Pino 13 | PGND — Power ground return |
| Pino 14 | PGND — Power ground return |
| Pino 15 | AGND — Analog ground |
| Pino 16 | PGOOD — Power-good indicator output |
| Pino 17 | FB — Voltage feedback (0.6V reference) |
| Pino 18 | RT — Timing resistor for switching frequency |
| Pino 19 | SS — Soft-start programming |
| Pino 20 | COMP — [DATA_NEEDED: pin function - confirm from datasheet] |
| Pino 21 | NC — Not connected |
| Pino 22 | NC — Not connected |
| Pino 23 | VIN — Input supply voltage |
| Pino 24 | VIN — Input supply voltage |
| Pino 25 | VIN — Input supply voltage |
| Pino 26 | VIN — Input supply voltage |
| Pino 27 | SW — Switch node |
| Pino 28 | SW — Switch node |
| Pino 29 | SW — Switch node |
| Pino 30 | SW — Switch node |
| Pino 31 | PGND — Power ground |
| Pino 32 | PGND — Power ground |
| Pino 33 | EP — Exposed thermal pad (must be soldered to PGND copper pour) |
Aplicações típicas
MIC28516T-E/PHA é adequado para 6 aplicaçãos: Industrial 24V/48V Point-of-Load Conversion, Telecom and Networking 48V Rail Regulation, Automotive 12V/24V Accessory Power, Battery-Powered Systems up to 60V, Distributed Power Architecture (DPA) Intermediate Bus, General Wide-Vin Step-Down Conversion.
Industrial 24V/48V Point-of-Load Conversion
The MIC28516T-E/PHA is purpose-built for industrial 24V and 48V point-of-load conversion thanks to its 4.5V-70V input range and 8A continuous output current. In a typical 24V-to-5V/8A POL design the part operates at >95% efficiency using Hyper Speed Control adaptive on-time architecture, eliminating the loop-compensation network required by classical voltage-mode controllers. The 32-VQFN-EP exposed-pad package keeps junction temperature within the 125C limit at full 8A load when soldered to a minimum 1 sq inch copper pour. Industrial PLCs, factory-automation controllers, and 24V-powered motor-drive auxiliaries are ideal fits where the wide Vin eliminates external protection components.
Recomendado
Telecom and Networking 48V Rail Regulation
In telecom and networking equipment, the MIC28516T-E/PHA converts a 36V-60V nominal bus (per ETSI/ATCA) down to 12V, 5V, or 3.3V intermediate rails at up to 8A. The 70V absolute-max input tolerance handles transient spikes on the 48V backplane without external TVS clamps in most cases. The adaptive on-time control maintains regulation within ±1% across load steps, critical for downstream POL converters powering FPGAs and ASICs. The integrated synchronous FETs reduce BOM count and PCB area versus controller-plus-discrete-FET designs.
Recomendado
Automotive 12V/24V Accessory Power
The MIC28516T-E/PHA suits automotive 12V and 24V accessory-rail applications because it tolerates the 70V load-dump transient per ISO 7637-2 without additional suppression circuitry. The 4.5V minimum input covers cold-crank scenarios on 12V systems down to ~6V, while the 70V maximum handles jump-start and load-dump events. Output currents to 8A support body controllers, LED headlamp drivers, infotainment head units, and ADAS sensor power. Note that the standard MIC28516T-E/PHA is not AEC-Q100 qualified; for automotive AEC-Q100 requirements, contact Microchip for automotive-graded variants in the same MIC28516 family.
Recomendado
Battery-Powered Systems up to 60V
For battery-powered systems with multi-cell stacks up to 60V nominal (e.g., 13S Li-ion at 54.6V full charge), the MIC28516T-E/PHA regulates the high-voltage battery directly down to logic or load voltages without an intermediate pre-regulator. The 4.5V minimum UVLO protects the battery from over-discharge, while the Hyper Speed Control maintains efficiency across the full discharge curve. E-bikes, e-scooters, portable medical equipment, and industrial battery tools are typical deployments where the high-voltage battery eliminates the need for a separate high-side boost stage.
Recomendado
Distributed Power Architecture (DPA) Intermediate Bus
In distributed power architectures, the MIC28516T-E/PHA serves as an intermediate bus converter (IBC) stepping a 24V or 48V primary rail down to 12V or 5V at 8A for downstream point-of-load regulators. The wide Vin eliminates the need for separate 12V and 24V converter variants in inventory, simplifying supply-chain and SKU management. Hyper Speed Control's adaptive on-time response handles dynamic load steps from downstream ASICs and FPGAs without output-voltage excursion beyond regulation limits.
Recomendado
General Wide-Vin Step-Down Conversion
For general-purpose wide-Vin step-down applications where the input rail can vary widely (e.g., USB-PD adapters, solar MPPT pre-regulators, brushed DC motor bus regulators), the MIC28516T-E/PHA provides a compact 8A solution. The external soft-start pin programs inrush current for hot-plug and capacitive-load scenarios, while the PGOOD output enables sequencing with downstream rails. Adjustable switching frequency from 200 kHz to 1 MHz allows efficiency-versus-component-size optimization per design.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MIC28516T-E/PHA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MIC28517T-E/PHA | MIC28516T-E/PHATR |
|---|---|---|---|
| Package | 32-VQFN-EP (5x5 mm) | 32-VQFN-EP - same | 32-VQFN-EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Input Voltage Range | 4.5 V to 70 V | 4.5 V to 70 V | 4.5 V to 70 V |
| Output Current | 8 A | 8 A | 8 A |
| Output Voltage Range | 0.6 V to 32 V | 0.6 V to 32 V | 0.6 V to 32 V |
| Control Architecture | Hyper Speed Control (Adaptive COT) | Hyper Speed Control (Adaptive COT) | Hyper Speed Control (Adaptive COT) |
| Soft Start | External programmable | External programmable | External programmable |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| RoHS | Compliant | Compliant | Compliant |
Principais diferenciais
- 70V absolute-maximum input voltage for 48V telecom and load-dump tolerance (vs LT8640IUDC-1)
- Hyper Speed Control eliminates loop-compensation network (vs LM5085QMYE/NOPB)
- 8A output from integrated FETs in compact 5x5 mm VQFN-EP (vs LT8645SEV)
Notas de projeto
Estimated: At VIN=24V, VOUT=5V, IOUT=8A, the MIC28516T-E/PHA dissipates approximately (24-5)*8 = 152 W of power, requiring substantial thermal management. With theta_JA around 25-30 C/W on a properly designed 1 sq inch 4-layer PCB copper pour, the junction temperature rise is roughly 152 W * 27 C/W ≈ 4100 C above ambient - clearly above the 125 C limit. Actual achievable output current at 24V input is limited to roughly 2-3A continuous without forced cooling, or roughly 5A with significant airflow. Designers should size the copper pour (and possibly add a topside copper heat-spreader) using the datasheet thermal derating curves.
Place input ceramic capacitors (typically 2x 10uF X7R 100V) as close as possible to the VIN and PGND pins on the top layer with short, wide traces. The exposed thermal pad must be soldered to a continuous PGND copper pour on the top layer with multiple thermal vias to inner PGND planes - this is the primary heat-dissipation path. Keep the SW node traces short and away from FB and AGND to minimize noise coupling. AGND should connect to PGND at a single point near the AGND pin to avoid ground-loop noise injection into the feedback path.
Per the MIC28516 datasheet PCB layout guidelines, keep the FB trace away from the SW node and the inductor to avoid switching-noise pickup that would degrade output-voltage accuracy. Use a Kelvin connection to the output-voltage sense point (VOUT_S+ and VOUT_S-) if available, or place feedback resistors near the output capacitor rather than near the IC. Minimize the loop area of the high-side FET, low-side FET, and output capacitor to reduce EMI - this means short SW traces and a tight input-capacitor-to-PGND return path.
Common pitfalls: (1) Omitting the bootstrap capacitor (typically 100nF) between BST and SW causes the high-side FET to fail to turn on fully, resulting in low output voltage and overheating; (2) Exceeding 70V on VIN even briefly will damage the IC - add a TVS clamp for inductive-load transients; (3) The RT resistor must be within the datasheet range (typically 50k-300k for 200kHz-1MHz) - an open or short at RT disables switching; (4) Do not load VOUT below the 0.6V reference range without a minimum-load resistor.
Informações de conformidade
RoHS and REACH compliant per distributor listings. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020. The standard MIC28516T-E/PHA is not AEC-Q100 qualified - for AEC-Q100 automotive applications contact Microchip for the automotive-grade MIC28516 variant. Halogen-free status not explicitly published in retrieved web data.
