CellWise Semiconductor designs ultra-low power analog and mixed-signal ICs for battery-operated devices. Their power management solutions, including linear chargers and fuel gauges, enable extended battery life in compact wearables and other electronics.
Funding
Funding not disclosed
Founders
Product
Problem
Battery-powered electronic devices, particularly compact wearables like smart rings, face significant challenges in achieving extended operational longevity due to limited battery capacity and the need for ultra-low power consumption. This constraint impacts user experience and product design, requiring highly efficient power management solutions.
Solution
CellWise Semiconductor designs and manufactures advanced analog and mixed-signal integrated circuits (ICs) focused on ultra-low power consumption for battery-operated devices. Their portfolio includes highly integrated power management solutions such as linear chargers, battery fuel gauges, and low-dropout regulators (LDOs). These ICs are engineered to optimize energy usage, enabling longer battery life and efficient operation in space-constrained applications like smart rings, TWS earbuds, and other wearables. By providing compact, high-performance power management components, CellWise empowers product developers to meet demanding battery life targets and enhance overall device functionality.
Target Audience
The primary customers are manufacturers and product designers in the consumer electronics sector, particularly those developing compact, battery-powered devices such as smart wearables, TWS earbuds, active stylus pens, and wireless peripherals.
Features
- **Linear Chargers (CW6308, CW6305/6307):** Support I2C interface and power path management, offering industry-leading small form factors. Features include up to 320mA (CW6308) or 470mA (CW6305/6307) charging current, ultra-low quiescent current as low as 5µA (CW6308) during battery-only operation with watchdog enabled, and ultra-low power modes (500nA) or shipping modes (300nA). Available in WLCSP-9 packages (1.24mm x 1.24mm for CW6308, 1.55mm x 1.55mm for CW6305/6307).
- **Fuel Gauges (CW2215):** Single-cell Li-ion battery fuel gauge with industry-lowest operating current of 5µA. Features a high-precision ADC, voltage, current, and temperature monitoring. Includes "FastCali" algorithm for accurate State of Charge (SOC), Cycle count, and State of Health (SOH) calculation, with configurable interrupt reporting for low battery or temperature events. Packaged in WLCSP-9 (1.58mm x 1.53mm).
- **LDO Regulators (CW6004):** Ultra-low power LDO with quiescent current as low as 300nA. Supports input voltage from 1.6V to 5.5V and offers multiple fixed output voltages. Provides 200mA output current and fast dynamic response for seamless transitions between standby and active modes. Available in a compact DFN-4 package (1.0mm x 1.0mm).
- **Buck Converters (CW6602, CW6603):** Ultra-low power Buck converters with static operating current as low as 330nA. CW6602 supports input voltage from 2.15V to 5.5V with 8 selectable output voltages (1.2V-3.3V) and 0.6A/1.0A peak load capability. Achieves over 90% efficiency at heavy load and 85% at 100µA light load. Features fast load dynamic response and is available in WLCSP-8 (1.575mm x 0.825mm). CW6603 offers a similar footprint with output voltages from 0.6V to 1.2V.
- **Load Switches (CW3301):** Ultra-low ON-resistance load switch with input voltage from 1.1V to 5.5V and 2.0A maximum current capability. Features controlled output slew rate for downstream protection, industry-leading 5nA ON-state quiescent current, and 12nA OFF-state leakage. Supports optional fast output discharge. Available in WLCSP-4 (0.76mm x 0.76mm).
- **Li-ion Battery Protection ICs (CW1011):** Single-cell Li-ion battery protection IC with high-precision over-voltage, under-voltage, over-current, and short-circuit protection. Integrates Dual MOSFETs with 54mΩ Rds(on). Features static operating current of 2.5µA and a low-power sleep mode down to 20nA. Packaged in DFN-6 (2.0mm x 1.5mm).
- **Multi-cell Battery Management ICs (CW1025, CW1026, CW1037):** 2-3 cell Li-ion battery protection ICs offering high voltage tolerance (up to 20V for CW1025/1026, 30V for CW1037), high protection accuracy (±5mV for over-current), low power consumption (3µA normal, 0.2/0.3µA sleep), and robust ESD immunity. CW1026 includes cell balancing functionality, and CW1037 supports high/low temperature protection.