NXP Semiconductors DC6M603X6/18A,135

Overview

DC6M603X6/18A from NXP Semiconductors is a 6 MHz, 650 mA synchronous step-down DC-DC converter in WLCSP6 package, delivering a fixed 1.8 V output from 2.8–5.5 V input. It integrates P/N-channel MOSFETs, a flyback diode, soft-start, and XSHUTDOWN (power-good) output. Designed for space-constrained portable power rails in camera modules and application processors.

For engineers reviewing the DC6M603X6/18A datasheet, DC6M603X6/18A pinout, DC6M603X6/18A application, or DC6M603X6/18A equivalent, key selection criteria include its 1.8 V fixed output, 6 MHz switching frequency enabling sub-1 µH inductor use, ±2 % DC output accuracy, integrated XSHUTDOWN signal, and WLCSP6 footprint with 0.4 mm pitch.

Technical Context

The DC6M603X6/18A employs a synchronous buck topology with integrated high-side PMOS and low-side NMOS switches, operating at a fixed 6 MHz PWM clock (5.4–6.6 MHz typical). Its control loop uses voltage-mode feedback via the FB pin to regulate output against load and line variations.

It features automatic PWM/PFM mode selection based on output current threshold detection, with forced PWM disabled - instead, it implements XSHUTDOWN functionality where the MODE pin serves as a power-good indicator synchronized to EN clock enable timing, with defined rise/fall delays (T1–T4 ≤100 µs).

Key Specifications

Pinout & Package

DC6M603X6/18A uses a Wafer-Level Chip-Size Package (WLCSP6) measuring 1.36 × 0.96 × 0.47 mm with 0.4 mm bump pitch and 3×2 solder ball array. The package is lead-free and moisture-sensitivity level (MSL) 1 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DC6M603X6/18A, the TPS622313DRYR offers lower quiescent current but omits XSHUTDOWN and needs more board area for magnetics, while the ADP2119ACPZ-R7 provides greater thermal headroom at the cost of footprint size and missing power-good functionality - making DC6M603X6/18A optimal for space- and timing-critical mobile imaging rails.

Availability

DC6M603X6/18A is available at Aetrix Electronics and suitable for smartphone camera modules, tablet PC I/O rails, and portable media player audio subsystems requiring stable component supply with tight timing control and ultra-compact packaging.

Supply support for DC6M603X6/18A 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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and mobile applications, with leadership in power management and RF technologies.

The DC6M60xX6 family was designed specifically for ultra-compact, high-efficiency power conversion in battery-powered imaging and mobile computing subsystems - prioritizing minimal footprint, fast dynamic response, and integrated sequencing signals like XSHUTDOWN.

FAQ

What is the function of the MODE pin on DC6M603X6/18A?

The MODE pin on DC6M603X6/18A serves as the XSHUTDOWN (power-good) output, not a mode select input. It asserts HIGH when the 1.8 V output reaches ≥90 % of nominal and remains stable, with timing delays T1–T4 specified in the datasheet. This differs from other variants like DC6M601X6 where MODE is an input.

Does DC6M603X6/18A require an external feedback resistor network?

No. DC6M603X6/18A is a fixed-output variant with internal feedback; the FB pin must be connected directly to GND per the datasheet. External resistors are unnecessary and would disrupt regulation - unlike adjustable versions such as DC6M602X6.

What inductor value is recommended for DC6M603X6/18A?

A 470 nH inductor is recommended for DC6M603X6/18A, optimized for its 6 MHz switching frequency. The datasheet specifies Lo(ext) = 0.47 µH, and Murata LQM21PNR47MC0 or FDK MIPS2012D0R5 are validated options meeting size and saturation current requirements.

Can DC6M603X6/18A be enabled using a clock signal instead of a DC HIGH level?

Yes. The EN pin accepts either a constant logic HIGH or a clock signal (5–27 MHz, 40–60 % duty cycle) to enable DC6M603X6/18A. This feature supports SMIA-compliant camera module timing, where the same clock enables both image sensor and DC6M603X6/18A simultaneously.

What protection features does DC6M603X6/18A include?

DC6M603X6/18A includes short-circuit protection (1.3 A current limit), overtemperature shutdown (150 °C with 40 K hysteresis), and soft-start current limiting. These functions operate autonomously without external components, ensuring robustness in portable device environments subject to thermal stress or accidental shorts.