onsemi NCP1410DMR2

Overview

NCP1410DMR2 from onsemi is a monolithic 250 mA synchronous rectified PFM step-up DC-DC converter IC designed for battery-powered handheld electronics. It integrates N- and P-channel MOSFETs, features a 1.19 V ±0.6% reference, 600 kHz switching frequency, 9.0 µA quiescent current, and an open-drain low-battery detector output - enabling efficient 1.5–5.5 V output generation from single-cell NiMH/NiCd or Li-ion sources.

For engineers reviewing the NCP1410DMR2 datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, Micro8 package mapping, validated pin roles, confirmed efficiency (up to 92%), startup capability down to 1.0 V, and real-world design constraints including cycle-by-cycle 1.0 A current limit and REF load capability of 2.5 mA at 3.3 V output.

Technical Context

The NCP1410DMR2 implements a PFM control scheme with fixed 1.4 µs typical maximum ON-time and 0.31 µs minimum OFF-time to regulate output voltage via feedback to the FB pin. Its internal 1.19 V reference drives both output regulation and low-battery detection (LBI threshold = 1.19 V ±12 mV hysteresis), while the ZLC comparator enables zero-current switching in DCM to prevent reverse inductor current.

Synchronous rectification uses integrated N-FET (R_DS(ON) = 0.6 Ω) and P-FET (R_DS(ON) = 0.9 Ω) switches with dead-time control to eliminate external Schottky diodes. Shutdown is logic-controlled (SHDN threshold: 0.6 V high, 0.3 V low), reducing supply current to 0.05 µA, and LBO provides open-drain low-battery signaling compatible with microcontroller GPIO inputs.

Key Specifications

Pinout & Package

The NCP1410DMR2 is housed in a compact 3.0 × 3.0 mm Micro8 (Case 846A) surface-mount package with exposed pad for thermal dissipation. Pin 1 is marked with a dot; pin numbering is counterclockwise when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61022DRVR and MAX17065ETA+, the NCP1410DMR2 offers unique integration of low-battery detection, reference output, and sub-10 µA quiescent current in a compact Micro8 package - making it optimal for simple, low-cost, battery-alert-enabled portable devices where external component count must be minimized.

Availability

NCP1410DMR2 is available at Aetrix Electronics and suitable for personal digital assistants, handheld audio players, digital still cameras, and hand-held instruments requiring stable component supply with long-term lifecycle support.

Supply support for NCP1410DMR2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP1410DMR2 belongs to onsemi's micropower DC-DC converter product line, engineered specifically for battery-operated portable electronics where ultra-low quiescent current, small solution size, and integrated protection features are critical.

FAQ

What is the minimum input voltage required for NCP1410DMR2 to start switching?

The NCP1410DMR2 guarantees startup at 1.0 V with no load, as specified in the datasheet. This enables reliable operation from single-cell alkaline, NiMH, or NiCd batteries even at end-of-discharge. Under load, startup voltage increases slightly depending on inductor DCR and output capacitance; typical startup at 250 mA load occurs at ~1.2 V. The internal circuitry uses charge-pump bootstrapping from the OUT pin to power gate drivers during low-VIN conditions, ensuring robust turn-on behavior.

Does NCP1410DMR2 require an external Schottky diode?

No - the NCP1410DMR2 integrates synchronous rectification using internal N- and P-channel MOSFETs, eliminating the need for an external Schottky diode in normal operation. However, an optional MBR0502 Schottky diode between LX and OUT pins is recommended only for startup below 1.2 V to assist initial charge transfer; it is not required for steady-state operation above 1.0 V input. This dual-mode design reduces BOM count while preserving reliability at ultra-low battery voltages.

How is the low-battery detection threshold set for NCP1410DMR2?

The low-battery detection threshold for NCP1410DMR2 is set externally using a resistor divider from battery voltage to LBI (pin 2), referenced to the internal 1.19 V reference. The threshold voltage V_LB = 1.19 V × (1 + R_LB1/R_LB2). For example, using R_LB2 = 330 kΩ and R_LB1 = 225 kΩ yields a 2.0 V threshold. The comparator includes 30 mV hysteresis to prevent chatter, and LBO (pin 3) asserts low when the divided voltage falls below the threshold, providing direct GPIO-compatible signaling to the host system.

What is the purpose of the REF pin on NCP1410DMR2, and how much current can it supply?

REF (pin 4) on the NCP1410DMR2 provides a precision 1.19 V reference output usable for external circuit biasing or as a stable voltage source. At V_OUT = 3.3 V, it can supply up to 2.5 mA with ±1.5% load regulation. When V_OUT increases, REF load capability scales proportionally. A 150 nF capacitor is required if REF is unloaded; a 1.0 µF capacitor is mandatory if loaded beyond 100 µA. This dual-capacitor requirement ensures stability across operating conditions without external regulators.

Can NCP1410DMR2 operate in continuous conduction mode (CCM), and what determines the mode?

Yes, the NCP1410DMR2 operates in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), automatically transitioning based on load and inductor value. CCM occurs at higher loads (e.g., >100 mA with 22 µH inductor at 3.3 V out), where inductor current never reaches zero. DCM occurs at light loads, where current drops to zero before the next switching cycle. The ZLC comparator monitors voltage across the synchronous P-FET to detect zero-current crossing and disable the switch before reverse current flows - ensuring efficiency and preventing battery discharge through the body diode.