onsemi NCP6334BMTBBTBG

Overview

NCP6334BMTBBTG from onsemi is a 3 MHz, 2 A synchronous buck converter optimized for portable applications powered by single-cell Li-ion or triple-cell alkaline/NiCd/NiMH batteries. It delivers externally adjustable output voltage (0.6 V to VIN), features integrated high- and low-side MOSFETs (RON_H = 140 mΩ typ @ 3.6 V, RON_L = 110 mΩ typ @ 3.6 V), and includes Power Good output, soft-start, and active discharge. It serves as the main point-of-load regulator in smartphone PMIC subsystems.

For engineers reviewing the NCP6334BMTBBTG datasheet, pinout, applications, or equivalent options, key selection criteria include its 3 MHz switching frequency enabling compact 1 µH inductors, 2.3–5.5 V input range compatibility with battery chemistries, automatic PWM/PFM mode transition for efficiency across load ranges, and WDFN-8 package thermal performance (R_JA = 62 °C/W).

Technical Context

The NCP6334BMTBBTG employs voltage-mode control with input supply voltage feedforward to maintain regulation across wide VIN variations. Its internal architecture integrates a P-MOSFET high-side switch and N-MOSFET synchronous rectifier, enabling continuous conduction mode (CCM) at medium/heavy loads and discontinuous conduction mode (DCM) with adaptive fixed-on-time PFM at light loads.

It implements cycle-by-cycle current limiting (ILIM = 2.8 A typ), thermal shutdown at 150 °C (25 °C hysteresis), and undervoltage lockout with 2.3 V falling threshold and 60–200 mV hysteresis. The Power Good (PG) function monitors FB voltage with 90% nominal threshold and 5 µs typical response delay during regulation transitions.

Key Specifications

Pinout & Package

Package: WDFN-8 (2.0 mm × 2.0 mm × 0.75 mm), 0.5 mm pitch, exposed thermal pad (Case 511BE). Low-profile construction (max 0.8 mm height) suits ultra-thin mobile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62260DRVR and RT6220AGQW, the NCP6334BMTBBTG offers superior thermal efficiency in ultra-compact form factor (2×2 mm), native Power Good integration eliminating BOM overhead, and tighter FB reference (±1%) enabling more accurate output voltage setting for sensitive SoC rails.

Availability

NCP6334BMTBBTG is available at Aetrix Electronics and suitable for smartphone power management, portable media player subsystems, and wireless modem baseband applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for NCP6334BMTBBTG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor technologies for automotive, industrial, and portable electronics markets.

The NCP6334BMTBBTG belongs to onsemi's high-frequency synchronous buck converter product line, designed specifically for space- and efficiency-critical battery-powered portable devices where small inductor size and extended runtime are mandatory.

FAQ

What is the maximum recommended output current for NCP6334BMTBBTG under continuous operation?

The NCP6334BMTBBTG is rated for up to 2.0 A continuous output current under typical conditions (T_A ≤ 60 °C, 2-layer PCB with thermal vias). At 85 °C ambient, derating applies: maximum sustainable current drops to ~1.4 A due to thermal limitations, as confirmed by the 150 °C thermal shutdown threshold and R_JA = 62 °C/W specification. Always verify with actual board thermal performance using the provided R_JB = 30 °C/W value.

Does NCP6334BMTBBTG support external synchronization to a system clock?

No, the NCP6334BMTBBTG does not support external clock synchronization. Its 3 MHz switching frequency is internally generated and fixed, with ±10% tolerance across temperature and input voltage. This contrasts with some competing buck controllers that offer SYNC pin functionality; the NCP6334BMTBBTG relies on inherent frequency stability and feedforward control for robustness in portable applications where EMI spread-spectrum is less critical than size and simplicity.

How does the Power Good (PG) function behave during input voltage brown-out events?

During input voltage brown-out, the NCP6334BMTBBTG's UVLO circuit disables the converter when VIN falls below 2.3 V (typical), forcing PG to go low after an 8 µs delay (TdPGL1). Once VIN recovers above the 60–200 mV hysteresis threshold, EN must be reasserted to restart regulation; PG then asserts high after 1.15 ms (TdPGH1) only after V_OUT reaches 95% of target. This ensures PG never falsely indicates "good" during unstable input conditions.

Can NCP6334BMTBBTG operate with ceramic output capacitors smaller than 10 µF?

Yes, the NCP6334BMTBBTG supports output capacitance as low as 4.7 µF, as validated in the datasheet's application guidance (Table 3). However, reducing below 10 µF increases output voltage ripple-e.g., at 1 A load, 4.7 µF yields ~2.5× higher ripple than 10 µF-and may degrade transient response. For stable 1.8 V SoC rails, 10 µF remains the recommended minimum to meet <20 mV ripple requirements without additional filtering.

What is the purpose of the separate AVIN and PVIN pins on NCP6334BMTBBTG?

The AVIN and PVIN pins isolate analog control circuitry from high-current power switching paths. AVIN supplies the error amplifier, reference, and logic blocks with a clean, low-noise source (bypassed with ≥1 µF capacitor), while PVIN feeds the power MOSFETs (bypassed with ≥10 µF capacitor). This separation minimizes coupling of switching noise into the feedback loop, improving regulation accuracy and stability-especially critical for low-V_OUT rails like 0.6–1.2 V used in modern processors.