NPS4053, NPS1000, NPS4069, NPS4001 Load Switch

Improve power consumption andsystem protection
Electronics power management
load switch ICs

In the rapidly evolving landscape of electronic circuitdesign, the choice between discrete and integrated
power switches is a pivotal decision that significantly
influences the performance, efficiency, and overall
footprint in a system design.
A typical system design will likely be comprised of a DC power source and one or moreloads that need to meet varying current requirements. Typically, the system needs tomanage the activation, timing, and speed of each load dynamically. This can either be doneusing discrete components, or with an integrated load switch. Fig 1. shows an example ofhow a system with a power switch would be necessary to control the load to an externalport, like a USB, HDMI, or display ports.

Nexperia Load Switches
Nexperia load switch ICs are highly integrated PowerManagement Integrated Circuits (PMICs) designed toefficiently control power rails within electronic systems.
Load switches serve as indispensable components for
managing power distribution and enabling the smooth
operation of various loads.
Integrated load switches offer a consolidated solution withbuilt in features such as undervoltage lockout, thermal
shutdown, reverse current blocking, quick output discharge,
and much more. This integration facilitates space-efficientdesigns and simplified implementation, contributing tooverall system reliability. While discrete solutions canalso include these features along with a high degree ofcustomization, they may require more intricate designs andlack the streamlined features inherent in integrated loadswitches.

LoadDC Supply

MCU/Control
SignalFig. 1 Power switch in a system design

NPS40XX series
The NPS40XX series encompasses a suite of 5.5V, 55mΩload switches, engineered to provide precise current
limitation within system architectures. These switches
are designed to enforce a constant-current mode,
activating when the output load current surpasses apredefined current limit threshold or encounters ashort circuit. The current limit threshold can either be
adjustable (NPS4053) or fixed (NPS4001/NPS4069)
depending on preference for the system design.
Furthermore, the NPS40XX series integrates active
reverse voltage protection, activating when the output
voltage exceeds the input voltage by a set threshold,as detailed in the product datasheets. In addition, thisfamily incorporates a FLG pin, which is a dedicated pin
for signaling fault conditions such as over-temperature,
reverse voltage, or over-current scenarios. This ensuresenhanced system safety and reliability.

NPS1000 load switch
The NPS1000 load switch is a low voltage, single-channelload switch with a low on-resistance (11mΩ) to minimize
the voltage drop and power loss across the pass FET
when ON. To achieve low input voltage levels on theinput pins and a low on-resistance, the device features
a bias pin to power the internal control blocks of thedevice.
The NPS1000 is available in an ultra-small, space saving,
1.42mm x 0.72mm 8-pin WLCSP package. Additionally,
it supports up to 0.6A RMS current and a peak currentof 1.5A.

NPS40XX Features and Benefits› Wide Input voltage: 2.5 V to 5.5 V› 110 mA to 2.5 A adjustable current limit tomeet multiple applications (NPS4053)› Fixed current limit versions 1.5A (NPS4069)
and 2A (NPS4001)› Enhances system robustness by providing protection
against ILIM pin open or short to GND› 6% current limit accuracy at 1.2 A› Active reverse current blocking to prevent previous
System from damage
Applications› Laptops, notebooks and PCs› USB ports/hubs, docking station and desktops› Set top box› Printers› Optical socket protection› Current limiting circuits

NPS1000 Features and Benefits› Input voltage: 0.5 V to 1.0 V› Low RDSON: 11mΩ typ at 25°C, 16mΩ max at 85°C
› Enable logic supports 1.2V logic levels› Controlled Startup•<
 200us from enable to full enhancementof power FET› Output short tolerant•W hen supplied by a 4.5A current
limited power supply› Over-Temperature Shutdown and Input UVLO Protection› 8Ω Discharge While Disabled› Small package footprint

Applications› Wearable devices› Mobile phones

Input voltage
Output voltage
VUVLO + Vhys(UVLO)

Voltage (V)Soft Start
A soft start circuit in an integrated load switch refers to afeature designed to control the inrush current when the loadswitch is first turned on. It minimizes large startup currents
from flowing to the load by turning on of the pass FET slowly
to avoid stressing connected loads. For integrated switches
that have a soft start feature, the output voltage will rise at alinear rate, reducing the amount of inrush current that flows
through the device. Integrated load switches such as theNPS1000, NPS4053, NPS4001 and NPS4069 have this featurebuilt into the device.

VUVLO

VUVLO shutdown VUVLO recovery
thresholdthresholdFig. 3 Undervoltage lockout input vs outputFig. 2 Integrated load switch with soft start

Under Voltage Lockout
Under-voltage lockout (UVLO) is a critical safety andefficiency feature integrated into load switches that isdesigned to prevent the load switch from turning on or off
until it has reached certain threshold levels. This function
ensures that the system is protected from operating inconditions that could lead to inefficient performance or
damage due to insufficient power. The UVLO feature isparticularly important in scenarios where a consistent power
level is crucial for the operation of sensitive electronic
components. Among the variety of load switches thatincorporate this feature, the NPS1000, NPS4053, NPS4001,
and NPS4069 stand out. These specific models are equippedwith UVLO to safeguard against under-voltage conditions,ensuring that the devices only operate within their optimal
voltage range. This inclusion enhances the overall reliability
and stability of the systems they are integrated into, by
preventing the ICs from attempting to function in potentiallyharmful low-voltage scenarios, thus maintaining system
integrity and prolonging the lifespan of the electronic
components they control.

Controlled Power Down (Quick Output Discharge)
The NPS4001, NPS4069, and NPS1000 offer controlled
power down through the use of an internal pull-downthat is enabled when the device is turned off. This feature
is commonly referred to as quick output discharge, which
rapidly discharges the output when the device is in its
off state. This feature is particularly useful in electronicsystems where precise control over the power supply iscrucial, such as in portable devices, computing systems,
and digital circuits. This feature facilitates quick power
cycling and system resets, enhancing the overall reliability
and performance of the system. Moreover, quick output
discharge will eliminate floating voltages at the input ofthe load and ensure that the load remains in a defined
power state.

VIN

VOUTCharge
PumpEN

Control
Logic

Driver

QOD
CircuitGND

Fig 4. Simplified load switch IC with quick output discharge functionality

Reverse Voltage Protection
Reverse voltage protection is a crucial feature in load
switch Integrated Circuits (ICs) that safeguards electronic
components from damage due to reverse flow of current
from the output of the device to the input. This protection
mechanism prevents the flow of current when the voltage
at the output exceeds the voltage at the input, which could
otherwise lead to severe component failure or reduced
functionality. The NPS4053, NPS4001, and NPS4069 load
switches are exemplary models that incorporate reverse
voltage protection, ensuring that devices remain protectedagainst the adverse effects of reverse voltage when theoutput exceeds the input by a set threshold. By integrating
this feature, these ICs enhance system reliability anddurability, particularly in environments where the powersupply delivering power to the load needs to be preserved
and protected.

Device

NPS1000

NPS4053

NPS4069/NPS4001

Vin (V)

0.5 - 1.0

2.5 - 5.5

2.5 - 5.5

1155

55

0.6 RMS, 1.5 peak

21.5 (NPS4069)
2 (NPS4001)

N/A

Adjustable

Fixed

When supplied by a 4.5A
current limited power supply√√

Over Temperature Protection√√√

Quick Output Discharge√Rds(on) (mQ)

Rated Current (A)Current limit

Output short protection√

Reverse voltage blocking√√

Fault Indicator√√

HWSON6, TSOP6TSOP5Package

WLCSP8Ordering information
PackageType number
Temperature range

NameDescription

VersionNPS4053GH-40 ºC to +125 ºC

HWSON6

Plastic thermal enhanced very very thin small
outline packages, no leads; 6 terminals; 0.65 mmpitch; 2.0 mm x 2.0 mm x 0.75 mm body

SOT8044-1

NPS4001GV-40 ºC to +125 ºC

TSOP5

Plastic surface-mounted package; 5 leads

SOT753

NPS4069GV-40 ºC to +125 ºC

TSOP5

Plastic surface-mounted package; 5 leads

SOT753

NPS1000UP-40 ºC to +85 ºC

WLCSP8Wafer level chip-scale package; 8 bumps

SOT8068© 2024 Nexperia B.V.
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Date of release:
March 2024