EVALUATION KIT AVAILABLE MAX16909 36V, 220kHz to 1MHz Step-Down Converter with Low Operating Current General Description Features The MAX16909 is a 3A, current-mode, step-down con- S Wide 3.5V to 36V Input Voltage Range verter with an integrated high-side switch. The device is S 42V Input Transients Tolerance designed to operate with input voltages from 3.5V to 36V S High Duty Cycle During Undervoltage Transients while using only 30FA quiescent current at no load. The S 5V Fixed or 1V to 10V Adjustable Output Voltage switching frequency is adjustable from 220kHz to 1MHz by an external resistor and can be synchronized to an S Integrated 3A Internal High-Side (70mI typ) external clock. The output voltage is pin selectable to Switch be 5V fixed or adjustable from 1V to 10V. The wide input S Fast Load-Transient Response and Current-Mode voltage range along with its ability to operate at high duty Architecture cycle during undervoltage transients make the device S Adjustable Switching Frequency (220kHz to 1MHz) ideal for automotive and industrial applications. S Frequency Synchronization Input The device operates in skip mode for reduced current consumption in light-load applications. Protection features S 30A Standby Mode Operating Current include overcurrent limit, overvoltage, and thermal shut- S 5A Typical Shutdown Current down with automatic recovery. The device also features S Overvoltage, Undervoltage, Overtemperature, and a power-good monitor to ease power-supply sequencing. Short-Circuit Protections The device operates over the -40NC to +125NC automo- tive temperature range, and is available in 16-pin TSSOP and TQFN (5mm x 5mm) packages with exposed pads. Ordering Information appears at end of data sheet. Applications Automotive Industrial High-Voltage Input DC-DC Converter Point-of-Load Applications Typical Application Circuit VBAT C C IN1 IN2 C 47F 4.7F BST 0.1F SUP SUPSW L1 BST V EN OUT 10H 5V AT 3A LX FSYNC V OUT C OUT D1 MAX16909 100F COMP OUT C COMP1 V BIAS R FOSC 2.7nF C COMP2 65kI V BIAS R 10pF COMP FOSC FB 47kI R PGOOD 10kI BIAS PGOOD POWER GOOD C BIAS GND 1F For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-5777 Rev 4 1/17MAX16909 36V, 220kHz to 1MHz Step-Down Converter with Low Operating Current ABSOLUTE MAXIMUM RATINGS SUP, SUPSW, LX, EN to GND ...............................-0.3V to +42V Continuous Power Dissipation (T = +70NC) A o SUP to SUPSW .....................................................-0.3V to +0.3V TSSOP (derate 26.1mW/ C above +70NC) .......... 2088.8mW* o BST to GND ...........................................................-0.3V to +47V TQFN (derate 28.6mW/ C above +70NC) ............ 2285.7mW* BST to LX ...............................................................-0.3V to +6V Operating Temperature Range ........................ -40NC to +125NC OUT to GND ..........................................................-0.3V to +12V Junction Temperature .....................................................+150NC FOSC, COMP, BIAS, FSYNC, I.C., PGOOD, Storage Temperature Range ............................ -65NC to +150NC FB to GND ............................................................-0.3V to +6V Lead Temperature (soldering, 10s) ................................+300NC o LX Continuous RMS Current ...................................................4A Soldering Temperature (reflow) ..................................... +260 C Output Short-Circuit Duration ....................................Continuous *As per the JEDEC 51 standard (multilayer board). Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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 THERMAL CHARACTERISTICS (Note 1) TSSOP TQFN Junction-to-Ambient Thermal Resistance (B ) .......38.3NC/W Junction-to-Ambient Thermal Resistance (B ) ..........35NC/W JA JA Junction-to-Case Thermal Resistance (B ) .................3NC/W Junction-to-Case Thermal Resistance(B ) ...............2.7NC/W JC 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 CHARACTERISTICS (V = V = 14V, V = 14V, R = 66.5kI, T = T = -40NC to +125NC, unless otherwise noted. Typical values are at SUP SUPSW EN FOSC A J T = +25NC.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V , SUP Supply Voltage Range 3.5 36 V V SUPSW Load-Dump Event Supply V t < 1s 42 V SUP LD LD Voltage I I = 1.5A 3.5 mA SUP LOAD Standby mode, no load, V = 5V 30 60 OUT Supply Current I FA SUP STANDBY Standby mode, no load, V = 5V, OUT 30 45 T = +25C A Shutdown Supply Current I V = 0V 5 12 FA SHDN EN BIAS Regulator Voltage V V = V = 6V to 36V 4.7 5 5.5 V BIAS SUP SUPSW BIAS Undervoltage Lockout V V rising 2.9 3.1 3.3 V UVBIAS BIAS BIAS Undervoltage-Lockout 400 mV Hysteresis Thermal-Shutdown Threshold +175 NC Thermal-Shutdown Threshold 15 NC Hysteresis OUTPUT VOLTAGE (OUT) Output Voltage V V = V normal operation 4.925 5 5.075 V OUT FB BIAS, Maxim Integrated 2