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Switching Regulators 
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MAX1653
High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP
10A DSP/CPU Core Supply with Secondary Outputs in Space-Saving QSOP Package
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The MAX1652-MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).
The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.
All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.
The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.
The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.
The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.
All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.
The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.
The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.
Key Features
- 96% Efficiency
- Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO)
- Pin-Compatible with MAX797 (MAX1653/MAX1655)
- Output Voltage Down to 1V (MAX1655)
- 4.5V to 30V Input Range
- 99% Duty Cycle for Lower Dropout
- 170µA Quiescent Supply Current
- 3µA Logic-Controlled Shutdown
- Dual, N-Channel, Synchronous-Rectified Control
- Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz
- Programmable Soft Start
- Low-Cost Secondary Outputs (MAX1652/MAX1654)
- Synchronous rectifier, secondary output regulation, high efficiency over full IOUT range
Applications/Uses
- Cell Phones
- Distributed Power
- Handheld Computers
- Handy Terminals
- Mobile Communications
- Notebook Computers
- PDAs
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 2.5 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 340 |
| Package/Pins | QSOP/16 SOIC (N)/16 |
| Budgetary Price (See Notes) | $3.69 @1k |
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Technical Docs
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Description
The MAX1653 evaluation kit (EV kit) provides a +3.3V output voltage from a +4.5V to +28V input. It delivers up to 2A output current with greater than 95% efficiency, operates at 300kHz switching frequency, and has superior line- and load-transient response.
This EV kit can be used to evaluate other output voltages in the +2.5V to +5.5V range by changing feedback resistors R2 and R3. It can also be used to evaluate the MAX1655, which has a +1.0V to +5.5V output voltage range.
Features
- +4.5V to +28V Input Voltage Range
- Selectable +3.3V or +5V Output Voltage
- +2.5V to +5.5V Adjustable Output (MAX1653)
- +1.0V to +5.5V Adjustable Output (MAX1655)
- 2A Output Current
- 3µA IC Shutdown Current
- 300kHz Switching Frequency
- Surface-Mount Construction
- Fully Assembled and Tested
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Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 2.5 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 340 |
| Package/Pins | QSOP/16 SOIC (N)/16 |
| Budgetary Price (See Notes) | $3.69 @1k |
Key Features
- 96% Efficiency
- Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO)
- Pin-Compatible with MAX797 (MAX1653/MAX1655)
- Output Voltage Down to 1V (MAX1655)
- 4.5V to 30V Input Range
- 99% Duty Cycle for Lower Dropout
- 170µA Quiescent Supply Current
- 3µA Logic-Controlled Shutdown
- Dual, N-Channel, Synchronous-Rectified Control
- Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz
- Programmable Soft Start
- Low-Cost Secondary Outputs (MAX1652/MAX1654)
- Synchronous rectifier, secondary output regulation, high efficiency over full IOUT range
Applications/Uses
- Cell Phones
- Distributed Power
- Handheld Computers
- Handy Terminals
- Mobile Communications
- Notebook Computers
- PDAs
Description
The MAX1652-MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).
The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.
All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.
The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.
The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.
The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.
All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.
The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.
The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.
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
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