EVALUATION KIT AVAILABLE MAX77596 24V, 300mA, Buck Converter with 1.1A I Q General Description Benefits and Features The MAX77596 is a small, synchronous buck converter Flexible Power for Systems That Require a Wide with integrated switches. The device is designed to Input Voltage Range deliver up to 300mA with input voltages from 3.5V to V Range: 3.5V to 24V IN 24V, while using only 1.1A quiescent current at no load Up to 300mA Output Current (fixed-output version). Voltage quality can be monitored Fixed 3.3V, 5V, or Programmable 1V to 10V by observing the RESET signal. The device can operate Output Voltage near dropout by running at 98% duty cycle, making it ideal 98% (Max) Duty Cycle Operation with Low for battery-powered applications. Dropout Operates from 5V, 12V, or 20V USB Type-C Input The device offers fixed 3.3V and 5V output versions, as Power well as an adjustable version. The adjustable version Operates from 2S, 3S, or 4S Li-Ion Battery allows the user to program the output voltage between 1V and 10V by using a resistor-divider. Frequency is fixed at Minimizes Power Consumption and Extends Battery 1.7MHz, which allows for small external components and Life reduced output ripple. The device offers both forced-PWM 1.1A Quiescent Current (3.3V Fixed Output and skip modes of operation, with ultra-low quiescent cur- Voltage) rent of 1.1A in skip mode. 86% Peak Efficiency at 12V , 3.3 V IN OUT The MAX77596 is available in a small (2mm x 2.5mm) Minimizes Solution Size 10-pin TDFN package and operates across the -40C to 1.7MHz Operating Frequency +85C temperature range. Small 2.0mm x 2.5mm x 0.75mm 10-Pin TDFN Package Applications Robust Solution Portable Devices Powered from 2s, 3s, Short-Circuit, Thermal Protections or 4s Li+ Batteries 6.67ms Internal Soft-Start Minimizes Inrush Current USB Type-C Devices Current-Mode Control Architecture Point-of-Load Applications Up to 42V Input Voltage Tolerance 19-7733 Rev 1 3/16MAX77596 24V, 300mA, Buck Converter with 1.1A I Q Absolute Maximum Ratings (Voltages Referenced to PGND) OUT/FB Short-Circuit Duration..................................Continuous SUP .......................................................................-0.3V to +42V Continuous Power Dissipation (T = +70C) A EN.............................................................. -0.3V to V + 0.3V (derate 9.8mW/C above +70C) ................................784mW SUP BST to LX ..............................................................................+6V Operating Temperature Range ........................... -40C to +85C BST......................................................................-0.3V to +47V Junction Temperature ......................................................+150C MODE, OUT/FB, RESET.......................-0.3V to V + 0.3V Storage Temperature Range ............................ -65C to +150C BIAS AGND.................................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) ...................................300C BIAS...................................................................-0.3V to +6.0V Soldering Temperature (reflow) .......................................+260C Package Thermal Characteristics (Note 1) TDFN Junction-to-Ambient Thermal Resistance (B ).........102C/W Junction-to-Case Thermal Resistance (B ) ..................2.9C/W JA JC Note 1: 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 Characteristic (V = V = 14V, V = 0V, T = T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C, unless SUP EN MODE A J A otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.5 24 V SUP Supply Voltage V t < 500ms (Note 3) 42 V SUP Shutdown (V = 0V) 0.75 3.0 EN No load, fixed 3.3V V 1.1 3.0 OUT No load, fixed 5.0V V 1.8 5.0 A OUT Supply Current I SUP T = +25C 32 70 No load, adjustable A V OUT T = -40C to +85C 80 A V = V , no load, FPWM, MODE BIAS 0.5 1 1.5 mA no switching V rising 3.0 3.2 3.4 BIAS UV Lockout V V UVLO Hysteresis 0.4 BIAS Regulator Voltage V V = 5.5V to 24V (MAX77596ETBC+) 5 V BIAS SUP BIAS Current Limit 10 mA BUCK CONVERTER V = 3.3V, 6V V 24V, OUT SUP V 3.1 3.3 3.4 OUT,3.3V I = 0 to 300mA LOAD Voltage Accuracy V V = 5.0V, 6V V 24V, OUT SUP V 4.8 5.0 5.15 OUT,5.0V I = 0 to 300mA LOAD Output Voltage Range V Adjustable output versions 1 10 V OUT Adjustable output versions, FB Voltage Accuracy V 0.98 1.0 1.03 V FB 3.5V V 24V, I = 300A SUP LOAD FB Input Current I V = 1V 0.02 A FB FB FB Load Regulation V I = 0.3mA to 300mA 2 % LOAD LOAD Maxim Integrated 2 www.maximintegrated.com