Analog Devices / Maxim Integrated MAX38647B Miniature nanoPower Buck Converters

Analog Devices Inc. / Maxim Integrated MAX38647B Miniature nanoPower Buck Converters with 4-level VSEL step-down from an input voltage range of 1.8V to 5.5V to a wide 0.5V to 1.8V output range. These buck converters automatically switch between ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM) to service the load at the highest possible efficiency depending on the load current. The easy-to-use MAX38647B aids in extending battery life with 94% peak efficiency, supports 100% duty-cycle operation, and offers short-circuit protection and internal active discharge. MAX38647B is available in a 1.82mm x 0.89mm, 0.4mm pitch 8-bump WLP package or a 3mm², 0.5mm pitch 10-pin TDFN package.

Features

Extends battery life
- 440nA ultra-low quiescent supply current
- 5nA shutdown current
- 94% peak efficiency and over 90% at 10µA
Easy to use, addresses popular operation
- 1.8V to 5.5V input voltage range
- 0.5V to 1.8V output voltage range
- Up to 175mA output current
Protects the system in multiple use cases
- Short-circuit protection
- Internal active discharge

Programmable single resistor (32x settings), 4x output voltage levels for each RSEL setting through digitally controlled VSEL1 and VSEL2 pins
EN pin for converter on/off control
100% duty-cycle mode for low dropout operation
-40°C to +125°C operating temperature range
Package options
- 8-bump WLP (1.82mm x 0.89mm, 0.4mm pitch)
- 10-pin TDFN (3mm x 3mm, 0.5mm pitch)

Applications

Portable space-constrained consumer products
Wearable devices, including ultra-low-power IoT, NB IoT, and Bluetooth® LE

Single Li-ion and coin-cell battery products
Wired/wireless industrial products

Specifications

1.8V to 5.5V input voltage range
0.5V to 1.8V output voltage range
±1.5% output accuracy
±1.6A_RMS maximum current
175mA output current
0.1µA maximum input shutdown current, 0.005µA typical
±2.5% typical DC load regulation
1ms typical soft-start time
240µs to 1320µs select-resistor detection time range
50Ω to 200Ω active discharge resistor range

0.2A to 0.3A inductor peak current limit range
12.5mA typical zero-crossing threshold
Continuous power dissipation
- 912mW for the WLP package
- 1951mW for the TDFN package
Temperatures
- -40°C to +125°C operating range
- +150°C maximum junction
- Soldering
  - +300°C lead for 10s
  - +260°C reflow

Analog Devices / Maxim Integrated MAX38647B Miniature nanoPower Buck Converters

Features

Applications

Specifications

Simplified Application Circuit

Block Diagram

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