Renesas SLG59M1748C

Overview

SLG59M1748C from Renesas Electronics is a reverse-blocking, self-powered p-channel MOSFET load switch optimized for high-side power-rail switching in space-constrained portable systems. It delivers 2.2 A continuous current at 5 V input, features 36 mΩ typical R_DS(ON), integrated reverse-voltage detection (32 mV threshold), and operates across 1.6 V to 5 V supply range - enabling robust power multiplexing in mobile devices with fast wake/sleep cycles.

For engineers reviewing the SLG59M1748C datasheet, SLG59M1748C pinout, SLG59M1748C application, or SLG59M1748C equivalent, key selection criteria include its 0.8 mm × 0.8 mm WLCSP package, reverse-current blocking behavior, slew-rate-controlled turn-on (0.23–1.2 ms V_OUT rise time), and low quiescent current (≤0.72 µA) in both ON and OFF states.

Technical Context

The SLG59M1748C integrates a single pFET with internal reverse-voltage detection circuitry that triggers switch disconnection within 50 µs when V_OUT exceeds VIN by >32 mV. Its control logic is level-sensitive CMOS with no internal pull-down on the ON pin, requiring external microcontroller drive.

Thermal performance is defined by θ_JA = 110 °C/W under standard PCB layout (1 in² copper pad per power pin), and safe operation is bounded by 2.2 A continuous current at 5 V and 1.2 A at 1.6 V - with peak pulsed current up to 2.5 A (VIN = 5 V, <1 ms, 1% duty cycle).

Key Specifications

Pinout & Package

SLG59M1748C uses a 4-pin Wafer-Level Chip-Scale Package (WLCSP) with laser-marked pin 1 index at corner A1. The package is Pb-free, halogen-free, and RoHS-compliant, with thermal performance optimized for direct PCB copper pad coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar pFET load switch applications.

Compared with TPS22916BLYFPR and NCP3902MUTBG, the SLG59M1748C uniquely combines reverse-voltage detection, ultra-small WLCSP footprint, and guaranteed 2.2 A operation at 1.6 V - making it optimal for space- and safety-critical mobile power routing.

Availability

SLG59M1748C is available at Aetrix Electronics and suitable for mobile device power management, USB-C port isolation, and low-power sensor subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SLG59M1748C 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog power, and mixed-signal solutions for automotive, industrial, and consumer markets.

The SLG59M1748C belongs to Renesas' GreenFET family of integrated load switches - designed specifically for ultra-compact, high-efficiency power sequencing and rail isolation in battery-powered portable electronics.

FAQ

What is the maximum continuous current rating for SLG59M1748C at 1.6 V input?

The SLG59M1748C supports 1.2 A continuous current at 1.6 V input, as specified in the Electrical Characteristics table on page 3 of the datasheet. This limit reflects reduced MOSFET channel conductivity at lower gate overdrive and is validated across the full –40 °C to +85 °C operating temperature range. Exceeding this current may cause thermal shutdown or accelerated aging.

Does SLG59M1748C require an external pull-down resistor on the ON pin?

No, SLG59M1748C does not include an internal pull-down on the ON pin, and Renesas explicitly advises against leaving the pin floating. The ON pin must be driven by a microcontroller GPIO or system controller - never left open-circuited - because its CMOS input lacks default state logic. This ensures deterministic power-up behavior in production systems.

How does SLG59M1748C prevent reverse current flow when VOUT exceeds VIN?

The SLG59M1748C monitors the voltage difference between VOUT and VIN continuously. When VOUT rises above VIN by more than 32 mV, its internal comparator triggers within 50 µs to open the pFET, physically disconnecting the path. This hardware-based reverse-voltage detection operates independently of the ON pin state and requires no firmware intervention - ensuring fail-safe protection during multi-rail switchover.

Can SLG59M1748C be used in a dual-switch configuration to multiplex two power sources?

Yes, the SLG59M1748C datasheet explicitly describes using two units (U1 and U2) to multiplex 5 V and 3.3 V rails onto a common output, as shown in Figure 7 on page 12. Proper sequencing - asserting ON2 before deasserting ON1 - avoids voltage glitches and ensures clean rail transitions without cross-conduction, making it suitable for dynamic power source selection in portable platforms.

What is the recommended minimum copper area under VIN and VOUT pins for thermal management?

Renesas specifies a 1 in² (2.54 cm²) copper pad under each of the VIN and VOUT terminals on FR4 PCB material to achieve the rated θ_JA = 110 °C/W. Reducing this area increases junction temperature proportionally - for example, halving the pad size may raise θ_JA by ~30–40 °C/W. Layout guidelines on page 13 emphasize short, wide traces (≥15 mils/A) to maintain reliability at 2.2 A continuous load.