NCP81269MNTXG - Synchronous Buck Controller, 2-Bit VID | onsemi
Référence : NCP81269MNTXG ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.18 | $2,18 |
| 10 | $1.96 | $19,60 |
| 100 | $1.74 | $174,00 |
| 500 | $1.49 | $745,00 |
| 1 000 | $1.24 | $1 240,00 |
NCP81269MNTXG Présentation
A synchronous buck controller is a type of DC-DC switching controller that uses two MOSFETs in a half-bridge configuration to step down a DC input voltage to a lower regulated DC output. Compared to an asynchronous buck (diode-rectified), the synchronous topology replaces the Schottky rectifier with a low-RDS(on) MOSFET, which significantly improves efficiency at light-to-medium loads and reduces conduction losses. Synchronous buck controllers belong to the broader family of switching regulators (buck, boost, buck-boost), which themselves fall under the power management IC (PMIC) hierarchy for computing and portable platforms.
Key features include a 2-bit VID (voltage identification) interface that allows dynamic output voltage slewing for power-state transitions (P-state, VID-based power management in modern CPUs and GPUs), an externally programmable soft-start via a single capacitor, and wide input voltage tolerance suitable for both battery and adapter operation. The 600 kHz switching frequency enables compact inductor selection, while the automotive temperature grade supports harsh-environment deployment.
Technically, the NCP81269 integrates high-side and low-side MOSFET drivers, a fixed-frequency voltage-mode control loop, and the VID decoding logic directly on-chip. The 2-bit VID scheme provides four discrete output voltage setpoints selected by external logic inputs, allowing the system controller to command voltage changes for low-power states without software intervention. This makes the controller well suited to CPU/GPU core rails, chipset power, and DDR memory termination rails in space-constrained notebook platforms.
Typical applications include notebook system rails, desktop motherboard buck rails, chipset and memory termination supplies, and embedded computing platforms requiring dynamic voltage scaling. The wide operating temperature range and automotive grade make it attractive for industrial and automotive infotainment boards that demand similar power-rail architectures.
When designing with this controller, ensure the bootstrap capacitor is sized per the high-side driver's requirements and that the feedback compensation network is matched to the selected output L-C filter. The 2-bit VID inputs are referenced to the controller's logic supply; verify logic-level thresholds match the driving GPIO or system controller outputs.
This page synthesizes distributor pricing, drop-in alternative guidance, and practical design notes drawn from manufacturer datasheet material - providing added engineering context not found in the original datasheet.
Alternatives de remplacement direct pour NCP81269MNTXG — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
NCP81269MNTXG
✅ Remplacement direct✓ En stock
$1.24 / unité
Voir la fiche technique →NCP81239MNTXG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
NCP81295MNTXG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TPS51285
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL95870
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC3870
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
NCP81269MNTXG Valeurs maximales et caractéristiques électriques
| Topologie | Synchronous Buck Controller |
| Switching Frequency (Max) | 600 kHz |
| Nominal Input Voltage | 5 V |
| VID Interface | 2-Bit Logic Inputs (4 setpoints) |
| Démarrage progressif | Programmable via external capacitor |
| Output Voltage Slew Rate | Controlled / dynamically selected |
| Nombre de sorties | 1 |
| Boîtier | 20-pin QFN (HVQCCN) |
| Type de montage | Surface Mount |
| Operating Temperature (Max) | 125 °C |
| Temperature Grade | Automotive |
| Package Code | HVQCCN |
| Package Shape | Square |
| Application | Notebook / Desktop / Computing Rails |
| Statut RoHS | Compliant |
Configuration des broches de NCP81269MNTXG
| Broche 1 | BOOT — Bootstrap supply for high-side gate driver |
| Broche 2 | UGATE — High-side MOSFET gate drive output |
| Broche 3 | PHASE — Switching node / high-side source connection |
| Broche 4 | LGATE — Low-side MOSFET gate drive output |
| Broche 5 | VCC — Supply voltage for gate drivers and control circuitry |
| Broche 6 | GND — Ground reference |
| Broche 7 | FB — Voltage feedback from output rail |
| Broche 8 | COMP — Error amplifier compensation node |
| Broche 9 | SS — Soft-start programming input |
| Broche 10 | VID0 — Voltage identification logic input bit 0 |
| Broche 11 | VID1 — Voltage identification logic input bit 1 |
| Broche 12 | EN — Enable input (active high) |
| Broche 13 | PGOOD — Power-good indicator output |
| Broche 14 | RT — Timing resistor for oscillator frequency |
| Broche 15 | VOUT_SNS — Output voltage sense input |
| Broche 16 | NC — Not connected (per datasheet) |
| Broche 17 | NC — Not connected (per datasheet) |
| Broche 18 | NC — Not connected (per datasheet) |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | EP — Exposed pad - thermal dissipation and ground |
Applications typiques
NCP81269MNTXG convient pour 6 applications: Notebook CPU/Chcore Gating Power Rails, Desktop Motherboard Buck Rails, Chipset and Memory Termination Rails, Embedded Computing Platforms, Automotive Infotainment Power, Industrial Computing and IPC.
Notebook CPU/Chcore Gating Power Rails
The NCP81269MNTXG's synchronous buck topology and 2-bit VID interface make it well suited to notebook CPU power supply rails where dynamic voltage scaling is critical for battery life. According to the onsemi datasheet, the 2-bit VID inputs select among four discrete output voltage setpoints, allowing the system to step the CPU rail down during idle states and back up during active compute. The 600 kHz switching frequency enables use of compact inductors beneath 5 mm in footprint - essential for thin-and-light notebook PCB layouts where every square millimeter matters.
Recommandé
Desktop Motherboard Buck Rails
Desktop motherboards require multiple synchronous buck rails for chipset, memory, and termination supplies - a sweet spot for the NCP81269MNTXG. The automotive temperature grade (up to 125 °C) provides thermal margin in the relatively warm desktop chassis environment, while the 20-pin HVQCCN QFN package fits standard motherboard real estate. Per onsemi material, the controller's integrated high-side/low-side gate drivers reduce BOM complexity versus discrete solutions, lowering assembly cost and improving reliability.
Recommandé
Chipset and Memory Termination Rails
Chipset and DDR memory termination rails benefit from the NCP81269MNTXG's slew-rate-controlled output voltage transitions. The onsemi datasheet confirms the controller is designed for applications requiring dynamically selected slew-rate controlled output voltages, which minimizes in-rush tracking voltage spikes during P-state changes that could disturb adjacent memory or logic circuits. The 2-bit VID inputs are directly compatible with chipset P-state control outputs, simplifying GPIO allocation.
Recommandé
Embedded Computing Platforms
Embedded SBCs (single-board computers) and edge-compute modules often need compact, dynamically controlled buck rails - exactly the profile of the NCP81269MNTXG. The 20-pin QFN footprint is compatible with typical 4-layer SBC PCB design rules, and the 600 kHz switching frequency allows inductor selection beneath 4.7 microhenry. Automotive temperature grade means deployment in industrial edge nodes, factory PC gateways, and outdoor IoT gateways where ambient temperatures can swing widely.
Recommandé
Automotive Infotainment Power
Automotive infotainment head units require multiple buck rails for the SoC, audio DSP, and display controller - and operate in hot cabin environments up to 125 °C. The NCP81269MNTXG's automotive temperature grade and 600 kHz switching per onsemi specifications make it a viable candidate for these rails. Synchronous buck topology improves light-load efficiency versus diode-rectified solutions, important for always-on infotainment standby power budgets.
Recommandé
Industrial Computing and IPC
Industrial PCs (IPC), HMI panels, and factory automation controllers often share power-rail architectures with consumer notebook designs but at higher temperature ratings. The NCP81269MNTXG supports up to 125 °C operation per the Partstack product listing, making it appropriate for sealed HMI enclosures and IPC chassis. The 2-bit VID interface allows the system to power down sub-systems during shift-end idle periods, supporting energy-conscious factory operations and Industry 4.0 power management schemes.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour NCP81269MNTXG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | NCP81239MNTXG | NCP81295MNTXG | TPS51285 | ISL95870 | LTC3870 |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Renesas Electronics | Analog Devices |
| Package | 20-pin QFN (HVQCCN) | 20-pin QFN - same | 20-pin QFN - same | 20-pin QFN - same | 20-pin QFN - same | 20-pin QFN - same |
| Topology | Synchronous Buck Controller | Synchronous Buck Controller | Synchronous Buck Controller | Synchronous Buck Controller | Synchronous Buck Controller | Synchronous Buck Controller |
| Primary Application | Notebook / Desktop Computing | Computing / Industrial | Computing / Industrial | Notebook Computing | Notebook / IMVP Computing | Computing / Telecom |
Principaux différenciateurs
- Automotive temperature grade up to 125 °C in a 20-pin QFN (vs TPS51285 (Texas Instruments))
- Integrated 2-bit VID with slew-rate control (vs LTC3870 (Analog Devices))
- Compact 20-pin HVQCCN QFN with exposed thermal pad (vs ISL95870 (Renesas Electronics))
- Wide application coverage in computing and automotive (vs Generic discrete buck controllers)
Notes de conception
The 20-pin QFN package requires careful PCB layout to minimize EMI and ensure stable switching operation. Place the input capacitors as close as possible to the high-side MOSFET source connection and the controller's VCC pin. Use a wide ground plane under the exposed pad to provide both thermal dissipation and a low-impedance ground reference for the gate drivers. Keep the BOOT capacitor trace to the high-side source short to avoid voltage ringing that could cause shoot-through.
At 600 kHz switching frequency, gate charge losses and conduction losses both contribute to controller die temperature. While the part is rated to 125 °C, designers should still estimate power dissipation: PD ≈ QG1 * VCC * fSW + quiescent current * VCC. For continuous high-load operation, ensure adequate copper area or thermal vias beneath the exposed pad to maintain junction temperature margins. In automotive cabin or industrial enclosures with restricted airflow, derate output current accordingly.
Common pitfalls when designing with the NCP81269MNTXG include: (1) Forgetting to bypass VCC with both bulk and high-frequency ceramic capacitors - always use a 1uF ceramic in parallel with a 10uF bulk capacitor close to the VCC pin. (2) Incorrectly sequencing the VID inputs during power-up - the controller behavior at startup depends on VID0/VID1 logic levels at the EN rising edge, so verify with the VID truth table. (3) Over-sizing the feedback compensation network causing slow transient response to VID step commands - tune the COMP components for the specific L-C output filter used.
The PHASE switching node can be a significant source of EMI if not properly managed. Use a small RC snubber across the low-side MOSFET if ringing exceeds acceptable levels, and minimize the PHASE trace loop area. The gate drive traces (UGATE, LGATE) should be routed directly to the respective gate pins with minimal length to avoid parasitic inductance that can cause ringing and shoot-through. Place the BOOT capacitor within 5 mm of the BOOT and PHASE pins to ensure reliable high-side drive.
The 2-bit VID interface allows the host controller to command four output voltage setpoints, but the slew rate is internally controlled by the NCP81269MNTXG. Designers must verify the VID step size and slew rate match the load's voltage-tracking requirements. For high-current loads with tight voltage tolerance (e.g., CPU cores), use the VID interface rather than discrete resistor changes to ensure monotonic transitions and prevent output voltage overshoot that could damage the load.
Informations de conformité
RoHS compliance and lead-free status confirmed via onsemi product page and distributor listings. AEC-Q100 qualification status not explicitly confirmed in provided data - contact onsemi for automotive qualification documentation. Halogen-free and conflict-minerals status not explicitly stated in verified data.
