Synchronous Buck Regulator, 2.5 MHz FAN53741 Description The FAN53741 is a 2.5 MHz step down switching voltage www.onsemi.com regulator, that delivers a fixed output from an input voltage supply of 2.3 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN53741 is capable of delivering a peak efficiency of 97% and can support a max load of 1300 mA. The regulator operates at a nominal fixed frequency of 2.5 MHz, which reduces the value of the external components achieving a total 2 solution size of 5.24 mm . At moderate and light load, Pulse WLCSP6 1.38x0.94x0.625 CASE 567UH Frequency Modulation (PFM) is used to operate the device with a low quiescent current of 60 A. Even with such a low quiescent current, the part exhibits excellent transient response during load swings. At MARKING DIAGRAM higher loads, the system automatically switches to fixedfrequency control, operating at 2.5 MHz. In Shutdown Mode, the supply current 1 2K K Pin1 drops below 0.5 A, reducing power consumption. Mark XY Z The FAN53741 is available in 6bump, 0.4 mm pitch, WaferLevel ChipScale Package (WLCSP). 12 = Alphanumeric Device Marking Features KK = Lot Rune Code X = Alphabetical Year Code 60 A Typical Quiescent Current Y= 2weeks Date Code 2 5.24 mm Total Solution Size Z = Assembly Plant Code 1300 mA Output Current Capability 2 Programmable Output Voltage 0.6 V to 3.3 V in 25 mV Steps via I C TYPICAL APPLICATION Functionality Programmable Current Limit 530 mA to 2150 mA in 108 mA Steps SW VIN 2 via I C Functionality L CIN COUT 2.3 V to 5.5 V Input Voltage Range FAN53741 FB SCL 2.5 MHz FixedFrequency Operation SDA BestinClass Load Transient Response Internal SoftStart Limits Battery Current Below 150 mA to avoid Brownout Scenarios Protection Faults (UVLO, OCP and TSP) Figure 1. Typical Application Thermal Shutdown and Overload Protection 6Bump WLCSP, 0.4 mm Pitch ORDERING INFORMATION This is a PbFree Device See detailed ordering and shipping information on page 2 of this data sheet. Applications Smart Phones Wearables Smart Watch Health Monitoring Sensor Drive Energy Harvesting Utility and Safety Modules RF Modules Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: April, 2021 Rev. 4 FAN53741/DFAN53741 ORDERING INFORMATION Max. Output Temperature Device Current Range Marking Part Number Output Voltage Package Shipping FAN53741UC108X 0.6 V to 3.3 V 1300 mA 40 to 85C WLCSP 3000 / Tape & Reel GM For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. RECOMMENDED EXTERNAL COMPONENTS Table 1. RECOMMENDED EXTERNAL COMPONENTS Component Description Vendor Parameter Typ. Unit L 0.47 H, 20%, 3.1 A, 43 m HTEH20161TR47MSR89 (Cyntec) L 0.47 H CIN 2.2 F, 20%, 6.3 V, X5R, 0402 C1005X5R0J225M050BC (TDK) C 2.2 F COUT 10 F, 20%, 6.3 V, X5R, 0402 C1005X5R0J106M050BC (TDK) C 10 PIN CONFIGURATION SDA A1 A2 VIN A2 A1 SDA VIN B1 B2 SW B2 B1 SCL SCL SW C1 C2 C2 C1 FB GND GND FB Figure 2. Top View (Bumps Down) Figure 3. Bottom View (Bumps Up) PIN DEFINITIONS Pin Name Description A1 SDA SDA. Serial Interface Data. Do not leave this pin floating. A2 VIN Input Voltage. Connect to input power source on positive terminal of input capacitor. B1 SCL SCL. Serial Interface Clock. Do not leave this pin floating. B2 SW Switching Node. Connect to SW pad of inductor. C1 FB Feedback. Connect to positive side of output capacitor. C2 GND Ground. Power and IC ground. All signals are referenced to this pin. www.onsemi.com 2