NXP Semiconductors SCCSP900842R2

Overview

SCCSP900842R2 from Freescale Semiconductor is a dual-output power management IC integrating a 4-switch synchronous buck-boost DC/DC converter and a low-noise LDO regulator. It accepts 3.0–4.4 V input from a single Li-Ion cell, delivers a fixed 3.3 V output at up to 1.4 A continuous load, operates at 1.625 MHz switching frequency, and provides analog current-sense (ISNS) and digital power-good (STTS) status signals for mobile system power monitoring.

For engineers reviewing the SCCSP900842R2 datasheet, SCCSP900842R2 pinout, SCCSP900842R2 application, or SCCSP900842R2 equivalent, this device supports seamless buck-boost mode transition, internal MOSFETs, integrated compensation, low-power LDO mode, and real-time output current reporting-critical for compact, battery-powered portable electronics requiring stable dual-rail power delivery.

Technical Context

The SCCSP900842R2 implements a fully integrated 4-MOSFET buck-boost topology with automatic mode selection: M1/M2 active in buck mode (VIN > 3.3 V), M1/M3 active in boost mode (VIN < 3.3 V), and M4 used as synchronous rectifier in both modes. Its internal bandgap reference (1.2 V at BGBYP) feeds both regulators and enables precise 3.3 V ±5% output accuracy and 2.775 V ±5% LDO regulation.

Control logic includes peak current limiting on M1, thermal shutdown, soft-start (700 µs), and dual enable thresholds: 1.8 V for normal operation and 1.2 V for low-power LDO-only mode (1 mA quiescent current). The ISNS pin outputs 2.084 V/A proportional to average output current, while STTS provides active-low power-good indication tied to VOUTP stability, thermal fault, or overcurrent conditions.

Key Specifications

Pinout & Package

The SCCSP900842R2 is housed in a 36-pin, 3.064 × 3.064 mm wafer-level chip-scale package (WLCSP) with 0.4 mm pitch and Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost + LDO power management applications.

Compared with MP2908AGQ-Z and TPS63020DSJR, the SCCSP900842R2 uniquely integrates both a monitored 3.3 V buck-boost regulator and a 2.775 V LDO in one WLCSP, offering system-level power telemetry and dual-rail capability without external components or signal routing overhead.

Availability

SCCSP900842R2 is available at Aetrix Electronics and suitable for mobile internet devices, tablet PCs, and netbooks requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SCCSP900842R2 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, analog, and power management solutions for automotive, industrial, and consumer markets.

The SCCSP900842R2 belongs to Freescale's advanced power management IC product line, designed specifically for portable battery-powered systems needing high-efficiency, space-constrained, multi-rail power delivery with built-in telemetry and fault reporting.

FAQ

What input voltage range does the SCCSP900842R2 support?

The SCCSP900842R2 supports a nominal input voltage range of 3.0 V to 4.4 V from a single Li-Ion battery cell. It can operate down to 2.8 V and up to 4.7 V under extended conditions, though full specifications are guaranteed only within the 3.0–4.4 V range. Operation below 3.0 V may result in degraded performance or failure to meet output accuracy and current capability specs.

How does the SCCSP900842R2 handle mode transitions between buck and boost operation?

The SCCSP900842R2 performs seamless buck-to-boost and boost-to-buck transitions as the input voltage crosses the 3.3 V threshold. This is achieved through internal control logic that dynamically reconfigures the four internal MOSFETs (M1–M4) without output interruption. In buck mode, M1 and M2 switch while M4 remains on; in boost mode, M1 stays on while M3 and M4 switch-ensuring continuous 3.3 V regulation during battery discharge.

What is the function of the ISNS pin on the SCCSP900842R2?

The ISNS pin on the SCCSP900842R2 provides an analog voltage output proportional to the average output current delivered to the 3.3 V rail. At PVIN = 3.6 V, the scaling factor is typically 2.084 V/A. This enables real-time load monitoring, dynamic power budgeting, and thermal management without requiring external sense resistors or amplifiers-directly supporting system-level power telemetry in the SCCSP900842R2 design.

Can the SCCSP900842R2 operate in low-power mode, and how is it enabled?

Yes, the SCCSP900842R2 supports a low-power mode where only the 2.775 V LDO (VREGOUT) remains active, reducing quiescent current to 1 mA. This mode is enabled by applying 1.2 V to the EN pin-but only after the device has first started up in normal operation (EN = 1.8 V). The low-power mode disables the buck-boost converter while retaining regulated auxiliary power, extending battery life during system sleep states.

What package type and dimensions does the SCCSP900842R2 use?

The SCCSP900842R2 uses a 36-pin wafer-level chip-scale package (WLCSP) with dimensions of 3.064 mm × 3.064 mm and a 0.4 mm ball pitch. It is Pb-free and complies with JEDEC J-STD-020C reflow standards, including a peak package temperature of +260 °C. The package features separate PGND and AGND balls to maintain analog/ground domain isolation critical for noise-sensitive regulation.