Analog Devices / Maxim Integrated MAX17552x Step-Down Converters
Analog Devices Inc. MAX17552x Step-Down Converters are high-efficiency and high-voltage with integrated MOSFETs and that operate over a 4V to 60V input voltage range. The converter can deliver output current up to 100mA at output voltages of 0.8V to 0.9V x VIN. The output voltage is accurate to within ±1.75% over the -40°C to +125°C temperature range.
The ADI MAX17552 and MAX17552B Step-Down Converters employ a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The Step-Down Converters consume only 22µA of no-load supply current in PFM mode. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify PCB layout.
Features
- Eliminates external components and reduces total cost
- No schottky-synchronous operation for high efficiency and reduced cost
- Internal compensation
- Fixed internal 5.1ms or programmable soft-start
- All-ceramic capacitors, ultra-compact layout
- Reduces number of DC-DC regulators to stock
- Wide 4V to 60V input voltage range
- Adjustable 0.8V to 0.9V VIN output voltages
- Delivers up to 100mA load current
- 100kHz to 2.2MHz Adjustable switching frequency range with external synchronization
- Configurable between PFM and forced-PWM modes
- Reduces power dissipation
- 22µA No load supply current
- Peak efficiency >90%
- PFM feature for high light-load efficiency
- 1.2µA (typ) Shutdown current
- Operates reliably in adverse industrial environments
- Peak current-limit protection
- Built-in output-voltage monitoring with open-drain active-low RESET pin
- Programmable EN/UVLO threshold
- Monotonic startup into prebiased output
- Overtemperature protection
- -40°C to +125°C Industrial/automotive temperature range
Applications
- Industrial sensors and process control
- 4mA to 20mA Current-loop powered sensors
- High-voltage LDO replacement
- Battery-powered equipment
- HVAC and building control
- General-purpose point of load
Typical Application Circuit
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Development Tools
Analog Devices / Maxim Integrated MAX17552x Evaluation Kits
Demonstration platform for the MAX17552x Step-Down Converters.
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| Part Number | Datasheet | Input Voltage | Input Voltage - Min | Output Current | Quiescent Current | Switching Frequency |
|---|---|---|---|---|---|---|
| MAX17552BATB+T |  |
4 V to 60 V | 4 V | 100 mA | 18 uA | 2.08 MHz |
| MAX17552AATB+T | |
4 V to 60 V | 4 V | 100 mA | 525 uA | 100 kHz to 2.08 MHz |
| MAX17551ATB+T | |
4 V to 60 V | 4 V | 50 mA | 22 uA | 2.08 MHz |
| MAX17551AUB+T | |
4 V to 60 V | 4 V | 50 mA | 22 uA | 2.08 MHz |
| MAX17551AUB+ | |
4.5 V to 60 V | 4.5 V | 50 mA | 22 uA | 100 kHz to 2.2 MHz |