-
- Battery Management
- Switching Regulator - Switching Regulators
- Power Management ICs
- Isolated Power
- Charge Pumps
- Linear Regulators (LDOs)
- LED Driver - LED Driver ICs
- Motor Driver ICs
- Power Protection and Control
- Display Power Control
- Voltage Supervisors
- Power Over Ethernet
- MOSFET Drivers and Controllers
- Power Modules
INTERACTIVE Data Sheet
Product Details
The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated flyback topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the primary switch. No auxiliary winding or optocoupler is required for output voltage regulation.
The MAX17690 is designed to operate over a wide supply range from 4.5V to 60V. The switching frequency is programmable from 50kHz to 250kHz. A EN/UVLO pin allows the user to turn on/off the power supply precisely at the desired input voltage. The MAX17690 provides an input overvoltage protection through the OVI pin. The 7V internal LDO output of the MAX17690 makes it suitable for switching both logic-level and standard MOSFETs used in flyback converters. With 2A/4A source/sink currents, the MAX17690 is ideal for driving low RDS(ON) power MOSFETs with fast gate transition times. The MAX17690 provides an adjustable soft-start feature to limit the inrush current during startup.
The MAX17690 provides temperature compensation for the output diode forward voltage drop. The MAX17690 has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 16-pin 3mm x 3mm TQFN package with a temperature range from -40°C to 125°C.
Get Started with No-Opto Flyback Technology and the MAX17690
Key Features
- 4.5V to 60V Input Voltage Range
- No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
- 2A/4A Peak Source/Sink Gate Drive Currents
- 50kHz to 250kHz Programmable Switching Frequency
- Input EN/UVLO Feature
- Input Overvoltage Protection
- Programmable Soft-Start
- Hiccup-Mode Short-Circuit Protection
- Thermal Shutdown Protection
- -40°C to 125°C Operating Temperature Range
- Space-Saving, 16-Pin 3 x 3 TQFN Package
Applications/Uses
- Industrial and Telecom Applications
- Isolated Flyback Converters
- PLC I/O Modules
- Wide-Range DC-Input Isolated Power Supplies
Compliance | IEEE 802.3af IEEE 802.3at IEEE 802.3bt |
PWM | Yes |
Switching Frequency (kHz) | 50-250 |
Package/Pins | TQFN-CU/16 |
Oper. Temp. (°C) | -40 to +125 |
VIN (V) (min) | 4.5 |
VIN (V) (max) | 60 |
Topology | Flyback |
Application (VIN) | Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V) |
Switch Type | External |
Control Loop | Current Mode |
Feedback | Primary Side |
Switching Frequency (kHz) | 250 |
Duty Cycle (%) (max) | 69 |
Oper. Temp. (°C) | -40 to +125 |
Package/Pins | TQFN-CU/16 |
Budgetary Price (See Notes) | 3.66 |
Simplified Block Diagram
Other products you might be interested in
Part No. | Description |
---|---|
MAX17596 | Peak-Current-Mode Controllers for Flyback and Boost Regulators |
Technical Docs
Design & Development
Click any title below to view the detail page where available.
Description/Applications
The MAX17690A evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondary side is enabled by replacing the secondary diode with a MOSFET to achieve 89.5% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The EV kit is programmed to operate at a 150kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1875VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
Get Started with No-Opto Flyback Technology and the MAX17690
Features
- 18V to 36V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High Frequency (150kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 90% Peak Efficiency
- Galvanic Isolation up to 1875VRMS
- Proven PCB Layout
- Fully Assembled and Tested
- Minimum Load for ±5% Regulation: 1% of Full-Load
Description/Applications
The MAX17690B evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The device switches at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1875VAC.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High-Frequency (180kHz) Switching
- Minimum Number of External Components
- 85.8% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1875VAC
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690EVKITC is a fully assembled and tested circuit board that demonstrates the working of an isolated 6W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated ±5V and provides up to 200mA of output current on each output. The MAX17690 switches at a 100kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: ±15V/200mA On Each Output
- Compact Design with High Frequency (100kHz) Switching
- Minimum Number of External Components
- 90.5% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690E evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 16.5W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondary side is enabled by replacing the secondary diode with a MOSFET to achieve 84.7% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is con gured for an isolated +3.3V and provides up to 5A of output current. The EV kit is programmed to operate at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 3.3V/5A DC
- Compact Design with High Frequency (200kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 84.7% Peak Efficiency
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690G evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The device switches at a 180kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VAC.
View DetailsFeatures
- 4.5V to 5.5V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High-Frequency (180kHz) Switching
- Minimum Number of External Components
- 86.4% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1500VAC
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690D evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 15W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondaryside is enabled by replacing the secondary diode with a MOSFET to achieve 89.6% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is configured for an isolated +5V and provides up to 3A of output current. The EV kit is programmed to operate at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 5V/3A DC
- Compact Design with High Frequency (200kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 89.6% Peak Efficiency
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690EVKITJ# evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 25W No-Opto Flyback DC-DC converter. This circuit uses MAX17690 in a 16-pin TQFN package with an exposed pad. The IC data sheet provides a complete description of the part and should be read in conjunction with this EV kit data sheet prior to operating the EV kit.
The MAX17690EVKITJ# EV kit output is configured for an isolated +12V and provides up to 2.1A of output current over a 40V to 80V input range, suitable for power-overethernet (PoE) applications. The EV kit regulates the output voltage within ±8% over line, load, and temperature without using the auxiliary winding/optocoupler for outputvoltage feedback.
View DetailsFeatures
- 40V to 80V Input Range, Suitable for PoE Applications
- Isolated Output: 12V/2.1A DC
- Compact Design with High Frequency (100kHz) Switching
- 89.9% Full-Load Efficiency
- Minimum Number of External Components
- Proven PCB Layout
- Fully Assembled and Tested
![]() | Tools & Models EE-Sim: Design & Simulate MAX17690 | Create Design |
![]() | SIMULATION MODELS MAX17690 SIMPLIS Schematic | Download |
![]() | SIMULATION MODELS MAXREFDES1100 SIMPLIS Schematic | Download |
Description/Applications
The MAX17690A evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondary side is enabled by replacing the secondary diode with a MOSFET to achieve 89.5% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The EV kit is programmed to operate at a 150kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1875VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
Get Started with No-Opto Flyback Technology and the MAX17690
Features
- 18V to 36V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High Frequency (150kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 90% Peak Efficiency
- Galvanic Isolation up to 1875VRMS
- Proven PCB Layout
- Fully Assembled and Tested
- Minimum Load for ±5% Regulation: 1% of Full-Load
Description/Applications
The MAX17690B evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The device switches at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1875VAC.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High-Frequency (180kHz) Switching
- Minimum Number of External Components
- 85.8% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1875VAC
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690EVKITC is a fully assembled and tested circuit board that demonstrates the working of an isolated 6W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated ±5V and provides up to 200mA of output current on each output. The MAX17690 switches at a 100kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: ±15V/200mA On Each Output
- Compact Design with High Frequency (100kHz) Switching
- Minimum Number of External Components
- 90.5% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690E evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 16.5W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondary side is enabled by replacing the secondary diode with a MOSFET to achieve 84.7% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is con gured for an isolated +3.3V and provides up to 5A of output current. The EV kit is programmed to operate at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 3.3V/5A DC
- Compact Design with High Frequency (200kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 84.7% Peak Efficiency
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690G evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 5W no-opto flyback DC-DC converter. This circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction with this quick start guide for demo circuit.
The EV kit output is configured for an isolated +5V and provides up to 1A of output current. The device switches at a 180kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VAC.
View DetailsFeatures
- 4.5V to 5.5V Input Range
- Isolated Output: 5V/1A DC
- Compact Design with High-Frequency (180kHz) Switching
- Minimum Number of External Components
- 86.4% Peak Efficiency
- Low-Cost Flyback Design
- Galvanic Isolation up to 1500VAC
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690D evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 15W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondaryside is enabled by replacing the secondary diode with a MOSFET to achieve 89.6% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is configured for an isolated +5V and provides up to 3A of output current. The EV kit is programmed to operate at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.
View DetailsFeatures
- 18V to 36V Input Range
- Isolated Output: 5V/3A DC
- Compact Design with High Frequency (200kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 89.6% Peak Efficiency
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
Description/Applications
The MAX17690EVKITJ# evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 25W No-Opto Flyback DC-DC converter. This circuit uses MAX17690 in a 16-pin TQFN package with an exposed pad. The IC data sheet provides a complete description of the part and should be read in conjunction with this EV kit data sheet prior to operating the EV kit.
The MAX17690EVKITJ# EV kit output is configured for an isolated +12V and provides up to 2.1A of output current over a 40V to 80V input range, suitable for power-overethernet (PoE) applications. The EV kit regulates the output voltage within ±8% over line, load, and temperature without using the auxiliary winding/optocoupler for outputvoltage feedback.
View DetailsFeatures
- 40V to 80V Input Range, Suitable for PoE Applications
- Isolated Output: 12V/2.1A DC
- Compact Design with High Frequency (100kHz) Switching
- 89.9% Full-Load Efficiency
- Minimum Number of External Components
- Proven PCB Layout
- Fully Assembled and Tested
![]() | Tools & Models EE-Sim: Design & Simulate MAX17690 | Create Design |
![]() | SIMULATION MODELS MAX17690 SIMPLIS Schematic | Download |
![]() | SIMULATION MODELS MAXREFDES1100 SIMPLIS Schematic | Download |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Compliance | IEEE 802.3af IEEE 802.3at IEEE 802.3bt |
PWM | Yes |
Switching Frequency (kHz) | 50-250 |
Package/Pins | TQFN-CU/16 |
Oper. Temp. (°C) | -40 to +125 |
VIN (V) (min) | 4.5 |
VIN (V) (max) | 60 |
Topology | Flyback |
Application (VIN) | Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V) |
Switch Type | External |
Control Loop | Current Mode |
Feedback | Primary Side |
Switching Frequency (kHz) | 250 |
Duty Cycle (%) (max) | 69 |
Oper. Temp. (°C) | -40 to +125 |
Package/Pins | TQFN-CU/16 |
Budgetary Price (See Notes) | 3.66 |
Key Features
- 4.5V to 60V Input Voltage Range
- No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
- 2A/4A Peak Source/Sink Gate Drive Currents
- 50kHz to 250kHz Programmable Switching Frequency
- Input EN/UVLO Feature
- Input Overvoltage Protection
- Programmable Soft-Start
- Hiccup-Mode Short-Circuit Protection
- Thermal Shutdown Protection
- -40°C to 125°C Operating Temperature Range
- Space-Saving, 16-Pin 3 x 3 TQFN Package
Applications/Uses
- Industrial and Telecom Applications
- Isolated Flyback Converters
- PLC I/O Modules
- Wide-Range DC-Input Isolated Power Supplies
Description
The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated flyback topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the primary switch. No auxiliary winding or optocoupler is required for output voltage regulation.
The MAX17690 is designed to operate over a wide supply range from 4.5V to 60V. The switching frequency is programmable from 50kHz to 250kHz. A EN/UVLO pin allows the user to turn on/off the power supply precisely at the desired input voltage. The MAX17690 provides an input overvoltage protection through the OVI pin. The 7V internal LDO output of the MAX17690 makes it suitable for switching both logic-level and standard MOSFETs used in flyback converters. With 2A/4A source/sink currents, the MAX17690 is ideal for driving low RDS(ON) power MOSFETs with fast gate transition times. The MAX17690 provides an adjustable soft-start feature to limit the inrush current during startup.
The MAX17690 provides temperature compensation for the output diode forward voltage drop. The MAX17690 has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 16-pin 3mm x 3mm TQFN package with a temperature range from -40°C to 125°C.
Get Started with No-Opto Flyback Technology and the MAX17690
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .