SGM41664: A Programmable Power Management IC With I2C Interface and Integrated ADC
The SGM41664 is a programmable power management IC with I2C interface and integrated analog-to-digital converter (ADC) for applications that need backup power or energy storage capability such as solid-state drivers (SSD). For example, in an SSD the power is needed for a few milliseconds after an unexpected supply loss to complete any remaining write action. The integrated efficient bidirectional synchronous Buck converter/Boost charger is capable of charging storage capacitors to as high as 36V from a 2.8V to 16V input source. A quasi-fixed frequency and constant off time controller provides fast transient response and excellent converter stability.
An integrated reverse blocking MOSFET (BLKFET) in the input allows blocking of energy leaking back to the removed source. The BLKFET has a programmable current limit in the range of 1.2A to 6.2A. BUS over-voltage protection threshold is selected based on the input source nominal voltage (3.3V, 5V or 12V) by strapping the OVP pin. The I2C interface is used to set the input current limit, switching frequency, Boost peak current limit and for measuring the storage capacitance and ESR. It is also used to monitor system variables and statuses, such as input voltage, input current, BUS voltage and storage voltage.
The SGM41664 is available in a Green TQFN-4×4-25L package to allow compact layout design and better space saving for higher SSD memory capacity.
Features:
Wide 2.8V to 16V Input Voltage Range
Up to 36V Programmable Storage Voltage
Up to 6.2A Programmable Input Current Limit
Efficient Bidirectional DC/DC Converter
Low RDSON for Internal MOSFETs
Input Reverse Blocking MOSFET (BLKFET): 14mΩ
High-side/Low-side MOSFETs: 45mΩ/47mΩ
STR Disconnect MOSFET (STRFET): 35mΩ
Adjustable BLKFET Turn-On Delay and Soft-Start
Adjustable Quasi-Fixed Frequency: 0.25MHz to 1.5MHz
Constant Off-Time Control in Steady State
Programmable Boost Charging Peak Current
Autonomous or I2C Modes for Optimal Operation
Complete Voltage and Current ADC Conversion
Selectable Input Over-Voltage Protection
Input Reverse Blocking to Block Leakage Current
Short-Circuit Protection at Energy Storage Side
Storage Capacitance Measurement
Abnormal ESR Detection
Applications:
Solid-state Drivers
Power Backup Systems
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