Analog Devices / Maxim Integrated MAX15462 Synchronous Step-Down DC-DC Converter
Analog Devices MAX15462 Synchronous Step-Down DC-DC Converter employs a peak-current-mode control architecture with a MODE pin. This pin can operate the device in the 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 skips pulse at light loads for high efficiency. The low-resistance on-chip MOSFETs ensure high efficiency at full load and simplify the PCB layout. To reduce input inrush current, the device offers an internal soft-start.
The device also incorporates an EN/UVLO pin that allows the user to turn on the part at the desired input voltage level. An open-drain active-low RESET pin can be used for output voltage monitoring.
The Analog Devices MAX15462 DC-DC Converter operates over the -40°C to +125°C temperature range and is available in a compact 8-pin (2mm x 2mm) TDFN package.
Features
- Eliminates external components and reduces total cost
- No Schottky-synchronous operation for high efficiency and reduced cost
- Internal compensation
- Internal feedback divider for fixed 3.3V, 5V output voltages
- Internal soft-start
- All-ceramic capacitors, ultra-compact layout
- Reduces the number of DC-DC regulators to stock
- Wide 4.5V to 42V input voltage range
- Fixed 3.3V and 5V output voltage options
- Adjustable 0.9V to 0.89V x VIN output voltage option
- Delivers up to 300mA load current
- Configurable between PFM and forced-PWM modes
- Reduces power dissipation
- 92% peak efficiency
- PFM feature for high light-load efficiency
- 2.2μA typical shutdown current
- Operates reliably in adverse industrial environments
- Hiccup-mode current limit and auto-retry startup
- Built-in output voltage monitoring with open-drain active-low RESET pin
- Programmable EN/UVLO threshold
- Monotonic startup into a pre-biased output
- Overtemperature protection
- -40°C to +125°C automotive/industrial temperature range
- 2mm x 2mm TDFN-8 package
Applications
- 4mA to 20mA current loops
- General-purpose point of load
- High-voltage LDO replacement
- HVAC and building control
- Industrial sensors
- Process control
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Block Diagram
