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Microchip Technology NX9548ILQ-TR
- Part No.:
- NX9548ILQ-TR
- Manufacturer:
- Microchip Technology
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
NX9548ILQ-TR.pdf
- Description:
- IC REG BUCK ADJ 7A 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
NX9548ILQ-TR from Microsemi is a synchronous buck switching regulator in a 5×5 mm multi-chip module (MCM), designed for high-current DC/DC step-down conversion in portable computing systems. It accepts 4.5–20 V input, delivers up to 7 A output at adjustable voltages from 0.75 V to 5.0 V, and features constant-on-time control with selectable synchronous CCM or diode-emulation mode for light-load efficiency optimization.
For engineers reviewing the NX9548ILQ-TR datasheet, NX9548ILQ-TR pinout, NX9548ILQ-TR application, or NX9548ILQ-TR equivalent, key selection criteria include its 7 A output capability, 0.75 V reference voltage, 312–468 ns programmable on-time, integrated high- and low-side MOSFETs (23 mΩ / 20 mΩ RDS(on)), and MCM-32L package thermal performance for notebook and tablet power rails.
Technical Context
The NX9548ILQ-TR implements constant-on-time (COT) control with internal 0.75 V reference and adaptive dead-band timing, enabling fast transient response and near-constant switching frequency across wide input/output ranges. Its architecture integrates gate drivers, bootstrap circuitry (BST), and overcurrent protection via external OCSET resistor sensing.
It supports three operational modes-PFM/non-synchronous, ultrasonic PFM (≥25 kHz), and forced CCM-selected via the ENSW/MODE pin voltage. Protection features include FB UVLO latch-off, overvoltage (125% VREF) latch-off, thermal shutdown (155 °C), and internal Schottky boost diode for bootstrap charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 20 V - supports single-supply operation from 12 V bus or battery-derived rails |
| Output Current | Up to 7 A - enables direct powering of CPU/GPU core rails in UMPC and notebook platforms |
| Output Voltage Range | 0.75 V to 5.0 V - programmable via external FB divider; 0.75 V reference enables sub-1 V core supplies |
| On-Time Range | 312–468 ns (typ.) - sets minimum operating frequency (~220 kHz at VIN=22 V, VOUT=1.5 V) |
| High-Side RDS(on) | 23 mΩ - reduces conduction loss in high-duty-cycle applications (e.g., 1.5 V out from 12 V in) |
| Low-Side RDS(on) | 20 mΩ - improves light-load efficiency in diode-emulation mode by minimizing reverse conduction loss |
| Shutdown Current | <1 µA - meets ultra-low-power standby requirements in mobile devices |
| Thermal Shutdown | 155 °C with 15 °C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
The NX9548ILQ-TR is housed in a 32-lead plastic multi-chip module (MCM) measuring 5 mm × 5 mm with exposed thermal pad (PAD1, PAD2, PAD3). The package uses copper leadframe and flip-chip die attach for low-inductance power paths and enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S1 (Pins 1–3) | High-side MOSFET source | Must connect directly to SW node via low-inductance plane; forms return path for high-side current |
| D1 (Pins 4,30–32) | High-side MOSFET drain | Internally tied to SW node; connects externally to inductor and output capacitor |
| D2 (Pins 5–8,19) | Low-side MOSFET drain | Connects to SW node; used with OCSET for current-sense-based overcurrent protection |
| S2 (Pins 9–14) | Low-side MOSFET source | Direct connection to GND via multiple vias; critical for low-impedance power ground return |
| PVCC (Pin 15) | Low-side driver supply | Requires 1 µF X5R ceramic decoupling to GND; powers low-side gate driver independently |
| OCP (Pin 16) | Overcurrent sense input | 24 µA internal current source flows through external resistor to SW; sets current limit threshold |
| HG (Pin 29) | High-side gate driver output | Drives high-side MOSFET gate; series resistor recommended to damp ringing on SW node |
| BST (Pin 20) | Bootstrap supply | Connects to BST capacitor (0.47 µF ceramic + 4.7 Ω series resistor); enables high-side N-channel drive |
| ENSW/MODE (Pin 22) | Enable and mode select | Voltage level selects PFM, ultrasonic PFM, CCM, or shutdown - no external logic required |
| VOUT (Pin 23) | Output voltage sense | Direct connection to output rail; internal discharge MOSFET pulls down during shutdown |
| TON (Pin 24) | Frequency programming | Resistor-to-GND sets on-time; 1 MΩ yields ~220 kHz at VIN=22 V, VOUT=1.5 V |
| VCC (Pin 25) | Bias supply | 5 V ±10% internal regulator input; requires 1 µF X7R ceramic decoupling close to pin |
| FB (Pin 26) | Feedback input | Compares output voltage (via resistor divider) to 0.75 V internal reference; sets regulation point |
| PGOOD (Pin 27) | Power-good indicator | Open-drain output; asserts high after soft-start when FB ≥90% VREF, with 1.6 ms delay |
| GND (Pins 21,28,PAD1) | Power and signal ground | Multiple dedicated pins and thermal pads ensure low-impedance return for high di/dt currents |
Key Features
| Feature | Design Value |
|---|---|
| Constant-on-time control | Delivers <10 µs load-step response and stable operation without external compensation components |
| Selectably synchronous operation | Diode-emulation mode eliminates reverse recovery loss at light loads; CCM mode ensures fixed-frequency EMI profile |
| Integrated bootstrap Schottky diode | Eliminates need for external bootstrap diode; reduces BOM count and layout area in compact MCM form factor |
| Adaptive dead-band control | Prevents shoot-through by dynamically adjusting high/low-side turn-off timing based on load and temperature |
| Programmable ultrasonic PFM | Maintains switching frequency ≥25 kHz under all load conditions, avoiding audible noise in thin-client and tablet designs |
| Latch-off protection suite | Simultaneous FB UVLO, OVP (125% VREF), and thermal shutdown prevent fault propagation during system-level anomalies |
Applications
| UMPC & Notebook Core Rail | Tablet SoC Power Delivery |
|---|---|
Use Scenario: Regulating 12 V bus to 1.0–1.5 V for Intel Atom or ARM Cortex-A series processor cores in ultra-mobile PCs. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic voltage scaling (DVS) and deep-sleep state transitions. Use Value: 7 A continuous output and 0.75 V reference enable compliance with JEDEC DDR/LPDDR memory I/O and core voltage specifications. | Use Scenario: Generating 1.8 V or 3.3 V from 8–20 V adapter input for application processors and display interface ICs in 7–10 inch tablets. IC Role / Device Role / Timing Role: High-efficiency point-of-load (POL) regulator supporting burst-mode operation during touchscreen idle periods. Use Value: Diode-emulation mode achieves >85% efficiency at 100 mA load, extending battery life without compromising transient response. |
| On-Board 12 V to 3.3 V Conversion | Portable Instrument DC/DC |
Use Scenario: Replacing discrete buck controllers in industrial handheld test equipment requiring stable 3.3 V for microcontrollers and ADCs. IC Role / Device Role / Timing Role: Single-chip solution integrating power FETs, drivers, and protection - eliminating external MOSFETs and gate resistors. Use Value: 5×5 mm MCM footprint saves >40% board area versus dual-MOSFET + controller solutions while maintaining 90% peak efficiency. | Use Scenario: Powering mixed-signal data acquisition modules in battery-operated field instruments with 4.5–20 V input range. IC Role / Device Role / Timing Role: Input-flexible regulator supporting both Li-ion (8.4 V max) and 12 V wall-adapter inputs without redesign. Use Value: 1 µA shutdown current and programmable soft-start (1.5 ms) meet stringent energy budget and inrush current limits in portable instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8205AZSP | Fixed 0.6 V reference; 6 A rated; QFN-32 package; no ultrasonic PFM mode | Lacks programmable frequency and adaptive dead-band; lower max input (18 V) | Preferred where cost sensitivity outweighs need for 7 A output or 20 V input margin |
| ISL95210IRZ | 0.5 V reference; 8 A rated; 40-pin QFN; supports DCR current sensing | Requires external current-sense resistor or inductor DCR network; higher pin count increases layout complexity | Chosen when tighter output tolerance (<±0.5%) or telemetry-capable current monitoring is required |
Compared with RT8205AZSP and ISL95210IRZ, the NX9548ILQ-TR uniquely combines 7 A capability, 20 V input rating, ultrasonic PFM, and integrated Schottky bootstrap in a 5×5 mm MCM - making it optimal for space-constrained, high-efficiency portable computing power rails where input voltage headroom and acoustic noise matter.
Availability
NX9548ILQ-TR is available at Aetrix Electronics and suitable for UMPC, tablet PC, and portable instrument applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for NX9548ILQ-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
Microsemi (now part of Microchip Technology) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for aerospace, defense, communications, and industrial markets.
The NX9548ILQ-TR belongs to Microsemi's mobile PWM switching regulator product line, engineered specifically for high-current, low-voltage DC/DC conversion in space- and thermally-constrained portable computing platforms.
FAQ
What is the maximum input voltage rating for the NX9548ILQ-TR?
The NX9548ILQ-TR supports an absolute maximum input voltage of 20 V on the VIN rail, with recommended operation from 4.5 V to 20 V. This allows direct use with standard 12 V and 19 V laptop adapters, as well as battery stacks up to five Li-ion cells. Exceeding 20 V risks permanent damage per the Absolute Maximum Ratings table.
Does the NX9548ILQ-TR require external MOSFETs?
No, the NX9548ILQ-TR integrates both high-side and low-side power MOSFETs within its multi-chip module - with typical RDS(on) values of 23 mΩ and 20 mΩ respectively. This eliminates the need for external switches, gate drivers, or bootstrap diodes, reducing total solution size and simplifying layout for compact portable designs.
How is output voltage set on the NX9548ILQ-TR?
The NX9548ILQ-TR uses an internal 0.75 V reference connected to the FB pin. Output voltage is set by an external resistor divider between VOUT and GND, where R1 connects from VOUT to FB and R2 connects from FB to GND. The formula is VOUT = 0.75 V × (1 + R1/R2). For example, R1 = 7.5 kΩ and R2 = 7.5 kΩ yields 1.5 V output.
What protection features does the NX9548ILQ-TR include?
The NX9548ILQ-TR includes overcurrent protection (via OCSET pin), overvoltage protection (latches off at 125% VREF), FB undervoltage lockout (latches off at 70% VREF), thermal shutdown (155 °C), and input UVLO (4.1 V typical). All protection functions assert latch-off behavior, requiring VCC or ENSW reset to resume operation - ensuring robust fault containment in mission-critical systems.
Can the NX9548ILQ-TR operate in ultrasonic mode to avoid audible noise?
Yes, the NX9548ILQ-TR supports ultrasonic PFM mode when the ENSW/MODE pin voltage is set to 60–80% of VCC. In this mode, minimum switching frequency is clamped to 25 kHz, eliminating coil whine and capacitor squeal in thin-profile consumer devices like tablets and UMPCs - while retaining the efficiency benefits of discontinuous conduction at light loads.
NX9548ILQ-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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):
- 20V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 7A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Both
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
NX9548ILQ-TR FAQ
1.How can I place an order for NX9548ILQ-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for NX9548ILQ-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 NX9548ILQ-TR reliable?
The price and inventory of NX9548ILQ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NX9548ILQ-TR is usually 5 days.
3.What payment methods are accepted for NX9548ILQ-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NX9548ILQ-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NX9548ILQ-TR?
NX9548ILQ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NX9548ILQ-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 NX9548ILQ-TR?
For technical support, including NX9548ILQ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NX9548ILQ-TR requirements.
6.How does Aetrix verify that NX9548ILQ-TR is sourced from the original manufacturer or authorized distributors?
All NX9548ILQ-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 NX9548ILQ-TR meets industry standards.
7.What is the process for return or replacement of NX9548ILQ-TR?
All NX9548ILQ-TR units undergo pre-shipment inspection (PSI). If there is an issue with NX9548ILQ-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 NX9548ILQ-TR part is unused and in its original packaging.
Return procedure for NX9548ILQ-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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