onsemi NCP1510FCT1G

Overview

NCP1510FCT1G from onsemi is a tri-mode synchronous buck DC-DC converter IC designed for baseband power supplies in portable electronics. It delivers 300 mA output in PWM mode and 30 mA in pulsed mode, features integrated P-FET/N-FET switches (R_DS(on) = 0.23 Ω), supports fixed output voltages of 1.05 V/1.35 V/1.57 V/1.8 V via CB0/CB1 pins, and achieves ultra-low 14 µA quiescent current in pulsed mode - enabling extended battery life in cellular phones and PDAs.

For engineers reviewing the NCP1510FCT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its tri-mode operation (sync PWM / internal-oscillator PWM / low-I_q pulsed), 450–1000 kHz sync frequency range, thermal shutdown protection, and micro bump 9-pin FC package with GNDP/GNDA separation for noise-sensitive analog power domains.

Technical Context

The NCP1510FCT1G implements current-mode PWM control with built-in slope compensation and cycle-by-cycle current limiting (800 mA typical). Its SYNC pin determines operational mode: low → pulsed mode (660 ns on-time, 30 mA max); high → internal 1.0 MHz oscillator PWM; external clock input → synchronized PWM (450–1000 kHz).

It integrates dual MOSFETs, feedback error amplifier, overvoltage protection (3% threshold), soft-start circuitry, and separate power (GNDP) and analog (GNDA) grounds. Output voltage is selected by CB0/CB1 logic levels per Table 2, with internal pull-up (CB1) and pull-down (CB0) resistors ensuring default 1.35 V if unconnected.

Key Specifications

Pinout & Package

Package: 9-pin micro bump FC (Case 499AC), Pb-free, 1.55 mm × 1.55 mm footprint, 0.5 mm pitch, coplanarity-controlled solder balls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYR and RT8059NGQW, the NCP1510FCT1G uniquely delivers sub-15 µA quiescent current in a dedicated pulsed mode while retaining full 300 mA PWM capability - making it optimal for battery-powered devices with aggressive sleep/active duty cycles.

Availability

NCP1510FCT1G is available at Aetrix Electronics and suitable for cellular phone baseband supplies, PDA processor core rails, and digital camera image sensor biasing requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP1510FCT1G 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensor technologies.

The NCP1510FCT1G belongs to onsemi's portable power management product line, engineered specifically for ultra-low-power, multi-mode DC-DC conversion in battery-operated consumer devices where sleep-mode current and dynamic voltage scaling are critical.

FAQ

What is the minimum input voltage required for NCP1510FCT1G to regulate 1.57 V output?

The NCP1510FCT1G requires a minimum input voltage of 2.5 V to maintain regulation at 1.57 V output. This headroom supports operation down to single-cell Li-ion battery voltages (~2.7 V nominal, ~2.5 V under load), enabling direct integration into portable equipment without pre-regulation stages. The device remains functional up to 5.2 V input, accommodating USB-powered or dual-cell configurations.

How does the NCP1510FCT1G achieve 14 µA quiescent current in pulsed mode?

The NCP1510FCT1G achieves 14 µA quiescent current in pulsed mode by disabling its high-frequency PWM circuitry and operating only essential bias and timing blocks. In this state, the internal oscillator is halted, gate drivers are gated off, and the control loop runs at a much lower frequency (free-running pulsed operation), drastically reducing dynamic and leakage currents. This behavior is triggered automatically when the SYNC pin is held low.

Can NCP1510FCT1G be used with an external 800 kHz clock source?

Yes, the NCP1510FCT1G accepts external synchronization signals from 450 kHz to 1000 kHz, including 800 kHz square waves applied to the SYNC pin. The rising edge triggers the P-FET turn-on event, allowing precise EMI frequency placement and system-level clock domain alignment. The SYNC pin has defined thresholds (V_SYNCH = 920–1200 mV high; V_SYNCL = 400–830 mV low) and 2.2 µA input current at 3.6 V, compatible with standard CMOS logic drivers.

What is the purpose of separate GNDP and GNDA pins on NCP1510FCT1G?

The NCP1510FCT1G separates GNDP (power ground) and GNDA (analog ground) to isolate high-current switching return paths from sensitive analog reference circuits. GNDP carries pulsed inductor current and FET switching transients, while GNDA serves the feedback amplifier, reference, and logic inputs. This separation minimizes noise coupling into the feedback loop, preserving output voltage accuracy (±3%) and stability - especially critical in noise-sensitive applications like image sensors and audio codecs.

How is output voltage selected on NCP1510FCT1G, and what happens if CB0/CB1 are left unconnected?

Output voltage on NCP1510FCT1G is selected via logic levels on CB0 (pin C3) and CB1 (pin C2): 00 = 1.05 V, 01 = 1.35 V, 11 = 1.57 V, 10 = 1.8 V. If left unconnected, CB1's internal pull-up resistor forces it high and CB0's internal pull-down forces it low, resulting in default 1.35 V output. This fail-safe configuration ensures predictable startup without external pull resistors in basic implementations.