Power management is where a design either runs quietly or fails intermittently. The three blocks most often requested are low-dropout regulators, precision voltage references and PWM controllers — and COSINE (科山芯创) offers alternatives for each. This guide covers how to choose and the parts we stock.
1. Low-dropout linear regulators
An LDO trades efficiency for simplicity, low noise and low cost. It remains the right answer for noise-sensitive analogue rails and small drops.
| Part | Notes | Link |
|---|---|---|
| COS29502WU (MIC29502) | Low-dropout linear regulator | COS29502WU (MIC29502) |
| COS29302WU (MIC29302) | Low-dropout linear regulator | COS29302WU (MIC29302) |
| COS2991S | Low-dropout linear regulator, original COSINE part | COS2991S |
2. Voltage references
For ADCs, DACs and comparators, the reference decides the absolute accuracy of the whole conversion.
| Part | Notes | Link |
|---|---|---|
| COSTLVH431A (TLVH431) | Voltage reference | COSTLVH431A (TLVH431) |
| COSTLVH432A (TLVH432) | Voltage reference | COSTLVH432A (TLVH432) |
3. PWM controllers
For off-line and isolated supplies, a current-mode PWM controller is still the practical core.
| Part | Notes | Link |
|---|---|---|
| COS3842BD (UC3842) | Current-mode PWM controller | COS3842BD (UC3842) |
| COS3525ADW (SG3525) | PWM controller | COS3525ADW (SG3525) |
Selection checklist
- Define input range, output and load current before choosing a regulator.
- For references, check initial accuracy and drift against your converter resolution.
- Size the PWM controller's sense resistor and transformer for your power level.
- Confirm package and pinout against the referenced device before volume build.
See the wider power management range and amplifiers range. Send us your input, output and package for a quote.
Frequently asked questions
What does 'low dropout' actually mean?
Dropout is the minimum input-to-output difference at which the regulator still regulates. A lower dropout lets you run from a supply closer to your output, which improves efficiency and extends battery life. The cost is a smaller headroom margin for load transients.
When do I use a voltage reference instead of a regulator?
A voltage reference sets a precise, stable voltage for an ADC, DAC or comparator, where absolute accuracy and drift matter more than load current. A regulator supplies a rail. Use a reference where the spec is the voltage itself, not the power.
Why are current-mode PWM controllers still common?
Current-mode control gives simpler compensation and good line rejection for off-line and isolated supplies, which is why UC3842 and SG3525 class controllers remain the backbone of many power designs. They are mature, well documented and widely second-sourced.
Are these COSINE parts drop-in replacements?
They are designed against the pinout and function of the referenced devices. Confirm package, pinout and electrical limits on the datasheet for your application before volume commitment.
About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the official datasheet before design-in or purchase.
Recommended next steps
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