• Low R_DS(ON) for Internal Switches 

    -Input Reverse Blocking Switch: 24 mΩ (Typical)

    -High-side and Low-side Switches for Bi-directional Dc-Dc Regulator: 70 mΩ /70 mΩ (Typical)

    -Disconnect Switch: 40 mΩ (Typical)

• 2.6V-16V Input Voltage Range with Maximum 36V Storage Voltage Range

• IN/BUS/STR Voltage and Input Current ADC

• Programmable Input Current Limit from 1.2A to 6.2A

• Selectable Input Over Voltage Protection: 3.8V, 5.7V, and 15V

• Input Power Source Detection to Guarantee Boost Stable Operation 

• Reverse Blocking at the Input Side to Prevent Leakage Current 

• BUS Auto-discharge Function

• Programmable Reverse Blocking Switch Turn-On Delay Time and Soft-start Time

• Integrated High-efficiency Bi-directional DC-DC Regulator: 

    -Programmable Peak Current for Boost Charging 

    -Programmable Quasi-Fixed Frequency Constant Off Time Control for Steady-State Operation

    -Selectable Boost CV Mode and Burst Mode

    -STR Pin Open Detection in Burst Mode

    -Programmable Boost Soft Start Time 

    -Programmable Storage Voltage with flexible OVP Threshold

    -Selectable Pulse Pre-charge Current for Super Capacitor Applications

• MTP(Multi-Times Programming) Memory for Control Parameters Programming using I2C

• Short-circuit Protection for Energy Storage Side

• Storage Capacitance Measurement

• Independent Load Switch Enable Control Pin

• RoHS Compliant and Halogen Free

• Compact Package: QFN4×4-25

The SY21524D is a power management device targeting power backup applications in Solid-State Drive (SSD) or other backup power supplies which require backup energy storage and release functions. The energy is transferred bi-directionally between the BUS side and the energy storage side with high efficiency using a bi-directional DC/DC regulator. Fast transient response and excellent stability are achieved using a quasi-fixed frequency constant off-time control architecture. 

A reverse blocking switch is integrated on the input side to prevent energy from leaking when the input power source is removed. The reverse blocking switch has a programmable current limit function, with a range of 1.2A to 6.2A. Three different BUS over voltage protection (OVP) thresholds are selectable using the OVP pin, to accommodate applications with different operating input voltage levels.

An I2C interface is integrated in SY21524D to enable adjusting a range of application specific parameters, and reduce the number of external components. Control parameters such as input current limit, switching frequency, and boost peak current limit can be programmed using the I2C memory mapped registers.

The SY21524D integrates a capacitance storage measurement block, consisting of an ADC and analog multiplexer. The measurement results are stored in internal read-only data registers and made available to a host MCU using the I2C interface.

The SY21524D is available in a 4 mm x 4mm QFN-25 package.