SL2188A28XG DC-DC Power Chip: Ultra-Low Nanoampere Quiescent Current, Dedicated Power Supply Solution for Low-Voltage Portable Devices

Home News Daily Highlight SL2188A28XG DC-DC Power Chip: Ultra-Low Nanoampere Quiescent Current, Dedicated Power Supply Solution for Low-Voltage Portable Devices

2026-07-31 27

For portable gadgets, wireless sensors and miniature wearable hardware powered by coin cells, single dry batteries and small lithium batteries, low-voltage input, ultra-long standby time and miniaturization stand as core demands of power supply design. Developed by Slkor, the SL2188A28XG is a PFM synchronous rectification boost DC-DC power chip built with advanced low-power CMOS technology. It integrates ultra-low 0.9V startup voltage, fixed precise 2.8V output, nanoampere standby power loss and stable 250kHz switching frequency, making it an optimal power conversion component for all kinds of miniature low-power electronic products.

I. Core Product Advantages

1. Ultra-Low 100nA Quiescent Current to Maximize Battery Runtime

Conventional boost DC-DC chips generally feature microampere-level quiescent current, which continuously drains power during device standby. In contrast, the SL2188A28XG only draws 100nA of quiescent current, resulting in negligible standby power loss. For wireless sensors, remote controllers and portable detectors that stay dormant most of the time and wake up intermittently, it drastically cuts self-discharge of batteries and multiplies the service life of coin cells and small lithium batteries, perfectly catering to miniature battery-powered devices with strict endurance requirements.

2. Wide Low-Voltage Input Range of 0.9V Compatible with Multiple Low-Voltage Batteries

Its input voltage ranges from 900mV to 5V and enables stable startup at a minimum of 0.9V, compatible with single/double/triple dry batteries, various coin cells such as CR2032 and CR2025, as well as 3.7V small lithium batteries. Even when battery power depletes and voltage drops below 1V, the chip can keep boosting to deliver a steady 2.8V output. It fully taps the residual capacity of batteries, prevents sudden shutdown at low power and extends the overall service cycle of equipment.

3. Fixed Precise 2.8V Output Matching Standard Power Supply for MCUs, Bluetooth and Sensors

The chip is factory-calibrated for a fixed 2.8V output with accuracy within ±2.5%, eliminating the need for external voltage divider resistors and simplifying peripheral circuits. 2.8V is the universal supply voltage for microcontrollers, BLE Bluetooth modules, infrared sensors and miniature display screens. No extra voltage regulation circuits are required; a single chip can directly power main control and signal acquisition units, reducing component count and shrinking PCB dimensions.

II. Explanation of Core Electrical Parameters

The input voltage supports a minimum of 900mV and maximum of 5V, covering most miniature low-voltage energy storage power supplies. It provides fixed 2.8V output without voltage divider networks, and its internal oscillator maintains a constant 250kHz switching frequency to standardize inductor and capacitor selection. The full operating temperature range of -20℃ to +70℃ meets the environmental requirements of civil equipment. With no-load quiescent current limited to only 100nA, it fundamentally reduces standby power consumption. The chip integrates a complete set of synchronous rectification power transistors, removing the requirement for external Schottky diodes and streamlining power supply design schemes.

III. Main Application Fields

Wireless Sensing Equipment
Temperature and humidity sensors, infrared human body detection probes, wireless door/window magnetic control modules and low-power IoT signal acquisition nodes powered by coin cells with long dormant cycles.
Miniature Wearable Electronics
Auxiliary sensors for smart bands, detection circuits in Bluetooth earphones and miniature health monitors powered by small-capacity lithium batteries.
Remote Controls & Small Consumer Electronics
Power supply circuits for all types of wireless remote controllers, electronic thermometers, handheld sphygmomanometers and miniature LED indicator lights.
Miniature Industrial Testing Instruments
Low-voltage power supply modules for battery-powered portable detectors, compact digital display meters and on-site signal collection terminals.
Auxiliary Power Supplies for Small Bluetooth/Wireless Modules
Dedicated 2.8V power supplies for BLE Bluetooth communication modules and 2.4G wireless transceivers.

IV. Practical Engineering Design Guidelines

Input Power Matching
A reverse-polarity protection diode is recommended for battery-powered circuits to prevent chip damage caused by reversed positive and negative power terminals. Avoid long-term operation with battery voltage below 0.9V to prevent insufficient output power of the chip.
Peripheral Component Selection
Select small power inductors matched to the 250kHz switching frequency and low-ESR ceramic output capacitors to minimize output ripple and ensure clean power supply for sensing and RF circuits.
Heat Dissipation & Layout Optimization
Shorten input and output traces of the chip on the PCB to reduce line impedance loss. Appropriately widen copper traces for power lines under heavy-load working conditions to lower temperature rise.
Environmental Operation LimitsKeep the long-term operating temperature of equipment below 60℃ as much as possible; temperatures exceeding 70℃ will slightly increase the chip’s quiescent power loss. For operation at -20℃, select capacitors with larger capacity to guarantee stable cold startup.
Power Consumption Optimization Solutions
For equipment with long dormancy periods, cooperate with MCUs to implement intermittent start-stop control, fully leveraging the ultra-low 100nA quiescent current to maximize battery service life.

V. Product Summary

The SL2188A28XG boost DC-DC chip boasts four core advantages: ultra-low 0.9V startup voltage, precise fixed 2.8V output, 100nA nanoampere quiescent current and low-noise 250kHz switching frequency. It addresses the common pain points of traditional low-voltage boost chips including high standby power loss, high startup voltage and complex peripheral circuits. With wide-temperature stability, compact packaging and minimal peripheral components, it is perfectly suited for low-power devices driven by coin cells and miniature lithium batteries such as wireless sensors, portable measuring instruments and wearable electronics.

Slkor keeps deepening its layout in low-power power management chips. The SL2188A28XG delivers a cost-effective, long-endurance standardized boost power supply solution for miniature battery-powered systems, helping hardware manufacturers realize thinner, more compact and lower-power product upgrades.

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