EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX77324 4.8V , 1.5A High-Efficiency, IN Ultra-Small Buck Converter General Description Benefits and Features The MAX77324 is a single channel high-efficiency syn- 1.5A Output Current Step-down Converter chronous step-down (buck) converter capable of deliver- 2.5V to 4.8V V Range IN 2 ing up to 1.5A of current. With a 6.89mm total solution 0.6V to 2V Adjustable V Range, 2% Accuracy OUT size, up to 93% efficiency, and 40A quiescent current, it is optimized for portable space constrained battery- 93% Peak Efficiency (3.8V , 1.8V ) IN OUT SKIP Mode for Higher Light-Load Efficiency operated applications. 40A Quiescent Current The device operates over a 2.5V to 4.8V input voltage 1A Shutdown Current range to support Li+ battery powered applications. The 2MHz Nominal Switching Frequency output voltage is adjustable from 0.6V to 2V, with a bet- ter than 2% accuracy over the whole temperature range. Enable Pin for Direct Hardware Control The device uses constant-on-time PWM control scheme. Cycle-by-Cycle Inductor Current Limit A nominal 2MHz switching frequency reduces the over- UVLO, Soft-Start, Active Output Discharge, all solution footprint by use of small 0603 inductor. An Short-Circuit, and Thermal Shutdown Protections automatic SKIP mode is also implemented to improve the light-load efficiency. The device provides low output 1.22mm x 0.85mm, 6-Bump WLP voltage ripple, excellent line and load regulation, and tran- 2 6.89mm Total Solution Area sient response. A dedicated enable pin allows for simple Uses Small 0603 0.47H Inductor hardware control. Applications Built-in undervoltage lockout (UVLO), soft-start, active 1-Cell Battery Powered Equipment output discharge, cycle-by-cycle short-circuit, and thermal shutdown protections insure safe operations under abnor- Portable/Wearables mal operating conditions. Internet of Things (IoT) Devices The device is available in a space-saving 1.22mm x Space Constrained Equipment 0.85mm, 6-bump wafer-level package (WLP). Ordering Information appears at end of data sheet. 1-Cell to Core Voltage Buck Converter Application Circuit 2 6.89mm SOLUTION SIZE L V OUT 0.47H 0.6V TO 2.0V L IN LX 2.5V TO 4.8V CIN C OUT DC SOURCE MAX77324 10F 22F C IN R * C TOP TOP 220pF FB ENABLE EN RBOT AGND PGND R R BOT TOP 30.1k, 1% 2.12mm *CHOOSE RTOP VALUE BASE ON VOUT, REFER TO TABLE 1 19-100206 Rev 1 3/18 3.25 mm C OUT CTOPMAX77324 4.8V , 1.5A High-Efficiency, IN Ultra-Small Buck Converter Absolute Maximum Ratings V to PGND ..........................................................-0.3V to 5.5V Operating Temperature Range ........................... -40C to +85C IN EN to AGND ..................................................-0.3V to V +0.3V Junction Temperature ......................................................+150C IN PGND to AGND ....................................................-0.3V to +0.3V Storage Temperature Range ............................ -40C to +150C FB to AGND...................................................-0.3V to V +0.3V Soldering Temperature (reflow) .......................................+260C IN LX Continuous Current (Note 1)....................................1.6A RMS Continuous Power Dissipation (Multilayer Board, T = +70C) (derate 10.51mW/C above +70C) .......841mW A Note 1: LX has internal clamp diodes to PGND and V . Applications that forward bias these diodes should not exceed the ICs IN package power dissipation limits. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 6 WLP Package Code W60H1+1 Outline Number 21-100206 Land Pattern Number Refer to Application Note 1891 Thermal Resistance, Four-Layer Board: Junction to Ambient ( ) 95.15C/W JA For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = 3.8V, V = 0.6V, typicals are at T = +25C. Limits are 100% production tested at T = +25C. Limits over the operating IN FB A A temperature range (T = -40C to +85C) are guaranteed by design and characterization, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 2.5 4.8 V IN V V rising 2.605 2.65 2.695 Input Undervoltage IN UVLO R IN V Lockout V V falling 2.25 2.3 2.35 IN UVLO F IN I EN = LOW, T = -40C to +85C 1 Shutdown Supply SHDN 85C A A Current I EN = LOW, T = +25C -1 +0.1 +1 SHDN 25C A Supply Quiescent No switching, no load, leakage from EN I 40 A Q SKIP Current is not included FB Voltage Accuracy V No load, PWM mode 0.588 0.6 0.612 V FB FB Input Current I -0.7 +0.7 A FB Maxim Integrated 2 www.maximintegrated.com