Overview
The MAX1674/MAX1675/MAX1676, which includes the MAX167CC/D variant, are high-efficiency, compact, step-up DC-DC converters produced by Analog Devices Inc./Maxim Integrated. These converters are designed to operate in small μMAX packages, making them ideal for space-constrained applications. They feature a built-in synchronous rectifier, which significantly enhances efficiency without the need for external components.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range | -0.3 | - | 6.0 | V |
| Switch Current (LX) | -1.5 | - | 1.5 | A |
| Output Current (OUT) | -1.5 | - | 1.5 | A |
| Continuous Power Dissipation (TA = +70°C) | - | - | 330mW (8-pin μMAX) | mW |
| Operating Temperature Range | -40 | - | 85 | °C |
| Junction Temperature | - | - | 150 | °C |
| Storage Temperature Range | -65 | - | 165 | °C |
| Lead Temperature (soldering, 10s) | - | - | 300 | °C |
| Efficiency | - | - | 94% | % |
| Shutdown Current into OUT | 0.1 | 1 | - | μA |
| Operating Current into OUT | 16 | 35 | - | μA |
Key Features
- High Efficiency: The MAX1674/MAX1675/MAX1676 converters achieve high conversion efficiency, up to 94%, due to the built-in synchronous rectifier.
- Compact Package: Available in small μMAX packages, making them suitable for space-constrained applications.
- Pulse-Frequency-Modulation (PFM) Control Scheme: Combines the high output power and efficiency of PWM with the ultra-low quiescent current of traditional PFM.
- Fixed Peak Current Limit: The internal N-channel MOSFET power switch has a fixed peak current limit, which can be 1A (MAX1674), 0.5A (MAX1675), or selectable (MAX1676).
- Low-Voltage Start-Up: Can start up from low-voltage inputs from single cells (Alkaline, NiCd, or NiMH) with the use of an external Schottky diode if necessary.
- Voltage Reference: The device includes a voltage reference that maintains excellent load regulation and can source up to 100μA to external circuits.
- Shutdown Mode: The device enters shutdown when the SHDN pin is low, reducing current consumption significantly.
Applications
- Portable Electronics: Ideal for battery-powered devices such as handheld games, personal digital assistants, and other portable electronics.
- Industrial Automation: Suitable for use in industrial control systems and automation where high efficiency and compact design are crucial.
- Medical Devices: Can be used in medical devices that require efficient power conversion and minimal heat generation.
- Aerospace and Defense: Applicable in aerospace and defense systems where reliability, efficiency, and compactness are essential.
Q & A
- What is the input voltage range for the MAX1674/MAX1675/MAX1676 converters?
The input voltage range is from -0.3V to 6.0V.
- What is the maximum output current for these converters?
The maximum output current is 1.5A.
- What is the operating temperature range for these devices?
The operating temperature range is from -40°C to +85°C.
- How efficient are the MAX1674/MAX1675/MAX1676 converters?
These converters can achieve an efficiency of up to 94%.
- What is the purpose of the built-in synchronous rectifier?
The built-in synchronous rectifier significantly improves efficiency without the need for external components.
- How do the converters handle low-voltage start-up?
They can start up from low-voltage inputs from single cells (Alkaline, NiCd, or NiMH) with the use of an external Schottky diode if necessary.
- What is the function of the voltage reference in these converters?
The voltage reference maintains excellent load regulation and can source up to 100μA to external circuits.
- How do you put the device into shutdown mode?
The device enters shutdown when the SHDN pin is low.
- What are some typical applications for these converters?
They are suitable for portable electronics, industrial automation, medical devices, and aerospace and defense systems.
- What is the switching frequency range for these converters?
The switching frequency can range up to 500kHz and depends on the load and input voltage.
