Features and Benefits
- Available in a Tiny 6-Pin SOT23 Package
- 50µA Typical Startup Current
- 1.2mA Typical Operating Current
- Large UVLO Hysteresis of 14V
- Fixed Switching Frequency of 262kHz ±12%
- 50% Maximum Duty Cycle Limit (MAX5021)
- 75% Maximum Duty Cycle Limit (MAX5022)
- 60ns Cycle-by-Cycle Current-Limit Response Time
The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the design of wide input voltage range isolated power supplies. These devices are well suited for use in universal input (85VAC to 265VAC) off-line or telecom (-36VDC to -72VDC) power supplies.
An undervoltage lockout (UVLO) circuit with large hysteresis coupled with low startup and operating current reduce power dissipation in the startup resistor and allow use of ceramic bypass capacitors. The 262kHz switching frequency is internally trimmed to }12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5021 with 50% maximum duty cycle and MAX5022 with 75% maximum duty cycle are recommended for forward converters and flyback converters, respectively. The MAX5021/MAX5022 are available in 6-pin SOT23, 8-pin µMAX, and 8-pin DIP packages and are rated for operation over the -40‹C to +85‹C temperature range.
- Isolated Power Supplies
- Low-Power Telecom Power Supplies
- Mobile Phone Chargers
- Standby Power Supplies
- Universal Offline Power Supplies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Programmable Fan Controllers6/21/2007
Designing Compact Telecom Power Supplies7/17/2002
How to Minimize Power Dissipation in Li+ Linear Chargers2/21/2002
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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