Analog Devices / Maxim Integrated MAX17640 Step-Down DC-DC Converters

Analog Devices Inc. MAX17640 Step-Down DC-DC Converters are high-efficiency, high-voltage, Himalaya synchronous DC-DC converters with integrated MOSFETs operating over a wide input-voltage range of 4.5V to 60V. The ADI converters support up to 400mA and generate output voltages from 0.9V to 0.89 x VIN; MAX17640A fixed at 3.3V, MAX17640B fixed at 5.0V, and MAX17640C is adjustable.

ADI MAX17640 Step-Down DC-DC 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. To reduce input inrush current, the MAX17640 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 RESET pin can be used for output voltage monitoring.

The MAX17640 has a wide -40°C to +125°C ambient operating 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
Flexibility to support multiple rails in a system
- Wide 4.5V to 60V input voltage range
- Fixed 3.3V and 5V output voltage options
- Adjustable 0.9V to 0.89 x VIN output voltage option
- Delivers up to 400mA load current
- Configurable between PFM and forced-PWM modes

Reduces power dissipation
- 92% Peak efficiency
- PFM Feature for high light-load efficiency
- 2.2µA (typ) Shutdown current
Operates reliably in adverse industrial environments
- Hiccup-mode current limit and auto-retry startup
- Built-in output voltage monitoring with open-drain RESET pin
- Programmable EN/UVLO threshold
- Monotonic startup into prebiased output
- Overtemperature protection
- Wide -40°C to +125°C ambient operating temperature range and -40°C to +150°C junction temperature range
- Complies with CISPR32 (EN55032) class B conducted and radiated emissions

Applications

Industrial sensors
4mA to 20mA Current loops
HVAC and building control

High-voltage LDO replacement
General purpose Point-of-Load

Analog Devices / Maxim Integrated MAX17640 Step-Down DC-DC Converters

Features

Applications

Typical Application Circuit

Block Diagram

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