MAX5068
NOT RECOMMENDED FOR NEW DESIGNSHigh-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator
1.25MHz, Universal-Input, Current-Mode PWM Controller with Precision-Programmable Switching Frequency and Start/Stop Voltage
- Part Models
- 4
- 1ku List Price
- Starting From $3.45
Overview
- Current-Mode Control with 47µA (typ) Startup Current
- Resistor-Programmable ±4.5% Accurate Switching Frequency:
- 25kHz to 1.25MHz (MAX5068A/B)
- 12.5kHz to 625kHz (MAX5068C/D/E/F)
- Rectified 85VAC to 265VAC or 36VDC to 72VDC Input (MAX5068A/C/D)
- Input Directly Driven from 10.8V to 24V (MAX5068B/E/F)
- Frequency Synchronization Input (MAX5068A/B/C/E)
- Programmable Dead Time and Slope Compensation
- Programmable Startup Voltage (UVLO)
- Programmable UVLO Hysteresis (MAX5068A/B/D/F)
- Integrating Fault Protection (Hiccup)
- -40°C to +125°C Automotive Temperature Range
- 16-Pin Thermally Enhanced TSSOP-EP Package
The MAX5068 is a high-frequency, current-mode, pulse-width modulation (PWM) controller that integrates all the building blocks necessary for implementing AC-DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking simplifies control-loop design, and a programmable internal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50%. The MAX5068A/B limit the maximum duty cycle to 50% for use in single-ended forward converters. The MAX5068C/D/E/F allow duty cycles up to 75%. The MAX5068 features an accurate externally programmable oscillator that simplifies system design.
An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation during brownout conditions.
A single external resistor programs the output switching frequency from 12.5kHz to 1.25MHz. The MAX5068A/B/C/E provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle is 50% for the MAX5068A/B and 75% for the MAX5068C/D/E/F. Programmable hiccup current limit provides additional protection under severe faults.
The MAX5068 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5069 data sheet for dual FET-driver applications.
Warning: The MAX5068 is designed to work with high voltages. Exercise caution.
Applications
- Industrial Power Conversion
- Isolated Telecom Power Supplies
- Networking System Power Supplies
- Server Power Supplies
- Universal-Input AC Power Supplies
Documentation
Data Sheet 1
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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX5068AAUE+ | TSSOP_4.4 / TSSOP_6.1 | ||
| MAX5068BAUE+ | TSSOP_4.4 / TSSOP_6.1 | ||
| MAX5068BAUE+T | TSSOP_4.4 / TSSOP_6.1 | ||
| MAX5068FAUE+ | TSSOP_4.4 / TSSOP_6.1 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 5 | ||
| MAX5021 | PRODUCTION | Current-Mode PWM Controllers for Isolated Power Supplies |
| MAX5022 | PRODUCTION | Current-Mode PWM Controllers for Isolated Power Supplies |
| MAX5052 | PRODUCTION | Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies |
| MAX5053 | PRODUCTION | Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies |
| MAX5069 | PRODUCTION | High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers |
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