EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX16952 36V, 2.2MHz Step-Down Controller with Low Operating Current General Description Benefits and Features The MAX16952 is a current-mode, synchronous PWM Meets Stringent Automotive Quality and Reliability step-down controller designed to operate with input volt- Requirements ages from 3.5V to 36V while using only 50A of quiescent +3.5V to +36V Input Voltage Range Allows current at no load. The switching frequency is adjustable Operation in Cold Crank Conditions from 1MHz to 2.2MHz by an external resistor and can High Duty Cycle During Undervoltage Transients Tolerates Input-Voltage Transients to +42V be synchronized to an external clock up to 2.4MHz. The MAX16952 output voltage is pin programmable to be Enable-Pin Compatible from +3.3V Logic Level to +42V either 5V fixed, or adjustable from 1V to 10V. The wide input voltage range, along with its ability to operate in Current-Limit, Thermal Shutdown, and Overvoltage Protection dropout during undervoltage transients, makes it ideal for -40C to +125C Automotive Temperature Range automotive and industrial applications. AEC-Q100 Qualified The MAX16952 operates in fixed-frequency PWM mode Increased Efficiency and Reduced BOM Cost and and low quiescent current skip mode. It features an Board Space enable logic input, which is compatible up to 42V to dis- Lowest BOM Count for Current-Mode-Control able the device and reduce its shutdown current to 10A. Architecture Protection features include overcurrent limit, overvolt- 16-Pin TSSOP-EP Packages age, undervoltage, and thermal shutdown with automatic recovery. The device also features a power-good monitor Low Quiescent Current Helps Designers Meet to ease power-supply sequencing. Stringent OEM Current Requirements 50A Quiescent Current During Skip Mode The MAX16952 is available in a thermally enhanced Operation 16-pin TSSOP package with an exposed pad, and is specified for operation over the -40C to +125C automo- High Switching Frequency Allows Use of Small, tive temperature range. Low-Cost External Components 1MHz to 2.2MHz Adjustable Switching Frequency Applications 2.1MHz Switching Frequency with Three Modes of Automotive Operation Industrial Skip Mode for Efficient, Low-Power Operation Military Forced Fixed-Frequency Operation Point of Load External Frequency Synchronization Adjustable Output Voltage Supports a Diverse Range Typical Operating Circuit of Applications V BAT 1V to 10V Output Voltage with 2% Accuracy C NH IN CBST SUP DH COMP BST Ordering Information L LX R COMP C COMP2 PART TEMP RANGE PIN-PACKAGE MAX16952 C COMP1 MAX16952AUE+ -40C to +125C 16 TSSOP-EP* MAX16952AUE/V+ -40C to +125C 16 TSSOP-EP* R NL SENSE DL PGOOD /V denotes an automotive qualified part. PGND EN +Denotes a lead(Pb)-free/RoHS-compliant package. FSYNC CS *EP = Exposed pad. V OUT OUT FOSC 5V FB COUT BIAS R FOSC SGND CL 19-5789 Rev 9 1/20MAX16952 36V, 2.2MHz Step-Down Controller with Low Operating Current Absolute Maximum Ratings SUP and EN to SGND ..........................................-0.3V to +42V PGND to SGND ....................................................-0.3V to +0.3V LX to PGND (Note 1) ...............................................-1V to +42V Continuous Power Dissipation (T = +70C) A BST to LX (Note 1) ..................................................-0.3V to +6V TSSOP (derate 26.1mW/C above +70C) ............2088.8mW BIAS, FB, PGOOD, FSYNC to SGND ....................-0.3V to +6V Operating Temperature Range ......................... -40C to +125C DH to LX (Note 1)....................................................-0.3V to +6V Junction Temperature ......................................................+150C DL to PGND (Note 1) .............................-0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C BIAS FOSC to SGND ......................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C BIAS CS and OUT to SGND ..........................................-0.3V to +11V Soldering Temperature (reflow) .......................................+260C Package Thermal Characteristics (Note 2) TSSOP Junction-to-Ambient Thermal Resistance ( ) .......38.3C/W JA Junction-to-Case Thermal Resistance ( ) .................3C/W JC Note 1: Self-protected against transient voltages exceeding these limits for 50ns under normal operation and loads up to the maximum rated output current. Note 2: 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, C = 10F, C = 94F, C = 2.2F, C = 0.1F, R = 14.3k, T = T = -40C to +125C, unless SUP EN IN OUT BIAS BST FOSC A J otherwise noted. Typical values are at T = +25C.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUP Input Voltage Range V (Note 4) 3.5 36 V SUP Fixed 5V output, fixed-frequency, PWM SUP Operating Supply Current I mode, V = V , no external FETs 1 mA SUP FB BIAS connected Skip Mode Supply Current I No load, fixed 5V output 50 90 A SKIP SUP Shutdown Supply Current I V = 0V 10 20 A SHDN,SUP EN V = 3.5V, I = 45mA 3.0 SUP BIAS BIAS Voltage V V BIAS 6V < V < 36V 4.7 5.0 5.3 SUP BIAS Undervoltage Lockout V V rising 3.1 3.4 V UVBIAS BIAS BIAS Undervoltage Lockout V falling 200 mV BIAS Hysteresis BIAS Minimum Load I V - V > 200mV 45 mA BIAS(MIN) SUP BIAS OUTPUT VOLTAGE (OUT) Output Voltage Adjustable Range 1.0 10 V OUT Pulldown Resistance R V = 0V or fault condition active 30 PULL D EN V = 6V to 36V, V = V , SUP FB BIAS Output Voltage (5V Fixed Mode) V 4.925 5.0 5.075 V OUT fixed-frequency mode (Note 5) FB Feedback Voltage V = 6V to 36V, 0V < (V - V ) < SUP CS OUT V 0.99 1.0 1.01 V FB (Adjustable Mode) 80mV, fixed-frequency mode FB Current I V = 1.0V 0.02 A FB FB FB Line Regulation V = V , 6V < V < 36V (Note 5) 0.02 %/V EN SUP SUP Maxim Integrated 2 www.maximintegrated.com