EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX77503 14V Input, 1.5A High-Efficiency Buck Converter with 9A I Q General Description Benefits and Features The MAX77503 is a synchronous 1.5A step-down DC- 1.5A Single Channel Buck Regulator DC converter optimized for portable 2-cell and 3-cell bat- 3V to 14V Input Voltage Range tery-operated and USB-C applications. The converter op- 0.8V to 99%V Output Voltage Range SUP 2 erates on an input supply between 3V and 14V. Output 0.8V to 5V I C Programmable in 50mV Steps voltage is adjustable between 0.8V and 5V in 50mV steps 1.55V to 99%V with External Feedback SUP 2 through an I C serial interface or 1.55V to 99% of the sup- Resistors ply voltage with external feedback resistors. Factory-pro- 1.2V, 1.8V, or 3.3V Factory Preset Options grammed default voltages of 1.2V, 1.8V, and 3.3V are of- High-Efficiency, Low-I Extends Battery Life Q fered to reduce component count for common rails. The 94% Peak Efficiency at 7.4V , 3.3V (2520 SUP OUT device features a low-I SKIP mode which allows excel- Q Inductor) lent efficiency at light loads. 9A I (12V , 1.8V Internal Feedback Q SUP OUT Dedicated enable and power-OK pins allow simple hard- Version) 2 ware control. An I C serial interface is optionally used for Selectable Light-Load SKIP and Forced-PWM full configuration and control for dynamic voltage scaling Modes and system power optimization. 1MHz or 550kHz Fixed-Frequency Switching Built-in undervoltage lockout (UVLO), output active dis- Hardware or Software Control charge, cycle-by-cycle current limit, thermal shutdown, Enable Input and Power-OK Output Pins 2 and short-circuit protection ensure safe operation under Optional I C Full Control Interface abnormal operating conditions. Protection Features The MAX77503 is available in a 12-bump, 0.4mm Cycle-by-Cycle Inductor Peak Current Limit pitch wafer-level package (WLP). Short-Circuit Hiccup Mode, UVLO, and Thermal Shutdown Protections Applications 1ms Default Soft-Start 2-cell/3-cell High Power Density Supplies Small Size Portable Li+/Li-ion Battery Powered Devices 1.85mm x 1.4mm (0.7mm max. height) WLP Drones, HD Cameras, and Notebook Computers 12-Bump, 0.4mm Pitch, 3 x 4 Array Space-Constrained Portable Electronics Ordering Information appears at end of data sheet. Simplified Application Circuit EFFICIENCY vs. LOADEFFICIENCY vs. LOAD MAX77503MAX77503 7.4V SUPPLY, 2520 INDUCTOR CASE SIZE7.4V SUPPLY, 2520 INDUCTOR CASE SIZE 100 3V TO 14V BST SUP 0.22F DC INPUT 90 4.7F L LX V OUT 80 C 1.5A MAX OUT OUT 70 V = 5.0V (EXT FB) OUT EN 60 V OUT = 3.3V (INT FB) HARDWARE BIASEN POK POWER OK 50 VOUT = 1.8V (INT FB) OR SOFTWARE V = 1.2V (INT FB) SDA OUT ENABLE 40 V L V = 0.8V (INT FB) SCL OUT 2.2F 30 FEEDBACKFEEDBACK VVOUTOUT RANGERANGE AGND PGND 20 INTERNAL 0.8V TO 5V EXTERNAL 1.55V TO 99%VSUP 10 SKIP MODE 0 0.00001 0.0001 0.001 0.01 0.1 1 10 14V, 1.5A HIGH-EFFICIENCY BUCK CONVERTER OPTIMIZED FOR 2 OR 3 CELL BATTERY APPLICATIONS LOAD CURRENT (A) 19-100131 Rev 2 12/18 EFFICIENCY (%)MAX77503 14V Input, 1.5A High-Efficiency Buck Converter with 9A I Q TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simplified Application Circuit . 1 Absolute Maximum Ratings 6 Package Information . 6 12 WLP . 6 Electrical Characteristics . 8 Typical Operating Characteristics 12 Bump Configuration . 18 12 WLP 18 Bump Descriptions . 18 Detailed Description 19 Buck Regulator Control Scheme . 19 Mode Control . 20 SKIP Mode . 20 FPWM Mode . 20 Buck Enable Control (EN) 21 Bias Enable Control (BIASEN) 21 V Regulator 21 L Soft-Start . 22 Power-OK (POK) Output . 22 Peak Inductor Current Limit 22 Active Discharge Resistor 22 Short-Circuit Protection and Hiccup Mode . 22 Thermal Shutdown . 22 Register Reset Condition 22 2 I C Serial Interface . 23 Register Map 23 MAX77503 . 23 Register Details 23 Applications Information . 25 Buck Enable Options . 25 Always-On . 25 Hardware Control 25 Software Control . 25 SUP Capacitor Selection 25 www.maximintegrated.com Maxim Integrated 2