MAX38647B
RECOMMENDED FOR NEW DESIGNSTiny, 1.8V to 5.5V Input, 440nA IQ, 175mA nanoPower Buck Converter with Four-Level VSEL
- Part Models
- 2
- 1ku List Price
- Starting From $1.12
Overview
- 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 System in Multiple Use Cases
- Short-Circuit Protection
- Internal Active Discharge
- Programmable Single Resistor (32 Settings)
- Four 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
- Reduces Size and Increases Reliability
- -40°C to +125°C Operating Temperature Range
- 8-Bump WLP (1.82mm x 0.89mm, 0.4mm Pitch)
- 10-Pin TDFN (3mm x 3mm, 0.5mm Pitch)
The MAX38647B is an ultra-low IQ (440nA) buck converter that steps-down an input voltage range of 1.8V to 5.5V to a wide range of output voltages from 0.5V to 1.8V. Through a single external resistor (RSEL) on the RSEL pin, it is possible to program four different output voltages as given in Table 1 in the data sheet. The output voltage can be changed dynamically between the selected four output voltages using two voltage select pins VSEL1 and VSEL2 by pulling them high or low. The four output voltages are determined during start-up. The output voltage transition from low voltage to high voltage is open-loop current-limit controlled. The voltage transition from high voltage to low voltage is purely dependent on the load.
The buck converter automatically switches 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 buck converter overregulates in ULPM to allow the output capacitor to prevent output undershoot during load transients. See Figure 1 in the data sheet for the MAX38647B mode transitions. The device supports 100% duty-cycle operation.
The active discharge resistor pulls OUT to ground when the part is in shutdown. In applications where the ambient temperature is more than +85°C, a load current of >10μA may be required to prevent the output from soaring due to power FET leakage.
APPLICATIONS
- Portable Space-Constrained Consumer Products
- Wearable Devices Ultra-Low-Power IoT, NB IoT, and Bluetooth® LE
- Single Li-ion and Coin-Cell Battery Products
- Wired, Wireless Industrial Products
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX38647BANA+ | WLCSP | ||
| MAX38647BANA+T | WLCSP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 21, 2025 - 2453N ASSEMBLY |
||
| MAX38647BANA+ | PRODUCTION | |
| MAX38647BANA+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
SIMPLIS Models 1
LTpowerPlay®
LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.
Open ToolEvaluation Kits
MAX38647B WLP Evaluation Kit
Resources
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