MAX16930/MAX16931 2MHz, 36V, Dual Buck with Preboost and 20A Quiescent Current General Description Benefits and Features The MAX16930/MAX16931 offer two high-voltage, Meets Stringent OEM Module Power Consumption synchronous step-down controllers and a step-up and Performance Specifications preboost controller. They operate with an input voltage 20A Quiescent Current in Skip Mode supply from 2V to 42V with preboost active and can 1% Output-Voltage Accuracy: 5.0V/3.3V Fixed or operate in drop-out condition by running at 95% duty Adjustable Between 1V and 10V cycle. The devices are intended for applications with Enables Crank-Ready Designs mid- to high-power requirements that operate at a wide Integrated Preboost for Operation Down to 2V in input voltage range such as during automotive cold- Bootstrap Mode crank or engine stop-start conditions. Wide Input Supply Range from 3.5V to 36V The MAX16930/MAX16931 step-down controllers (without Preboost) operate 180 out-of-phase at frequencies up to 2.2MHz EMI Reduction Features Reduce Interference with to allow small external components, reduced output Sensitive Radio Bands without Sacrificing Wide Input ripple, and to guarantee no AM band interference. The Voltage Range switching frequency is resistor adjustable. The FSYNC 50ns (typ) Minimum On-Time Guarantees Skip- input programmability enables three frequency modes Free Operation for 3.3V Output from Car Battery for optimized performance: forced fixed-frequency at 2.2MHz operation, skip mode with ultra-low quiescent Frequency-Synchronization Input current (20A), and synchronization to an external clock. Resistor-Programmable Frequency Between The devices also provide a spread-spectrum option to 200kHz and 2.2MHz minimize EMI interference. Integration and Thermally Enhanced Packages Save The MAX16930/MAX16931 are offered with an Board Space and Cost asynchronous step-up controller. This preboost cir- Dual, 2MHz Step-Down Controllers cuitry turns on during low input voltage conditions. It is 180 Out-of-Phase Operation designed to provide power to step-down controller chan- Current-Mode Controllers with Forced-Continuous nels with input voltages as low as 2V. and Skip Modes Thermally Enhanced 40-Pin TQFN-EP and The devices also feature a power-OK monitor and Side-Wettable QFND-EP Packages overvoltage and undervoltage lockout. Protection features include cycle-by-cycle current limit and thermal Protection Features Improve System Reliability shutdown. Supply Overvoltage and Undervoltage Lockout Overtemperature and Short-Circuit Protection The devices are available in 40-pin TQFN-EP and side-wettable QFND-EP packages and are specified Applications for operation over the -40C to +125C automotive POL Applications for Automotive Power temperature range. Distributed DC Power Systems Navigation and Radio Head Units Selector Guide and Ordering Information appear at end of data sheet. 19-6631 Rev 13 7/16MAX16930/MAX16931 2MHz, 36V, Dual Buck with Preboost and 20A Quiescent Current Absolute Maximum Ratings IN, INS, CS3P, CS3N, FB3, EN1, EN2, LX to PGND (Note 1) .........................................-0.3V to +42V EN3, TERM to PGND .......................................-0.3V to +42V PGND to AGND ..................................................-0.3V to +0.3V CS1, CS2, OUT1, OUT2 to AGND ........................-0.3V to +11V PGOOD1, PGOOD2 to AGND...........................-0.3V to +6.0V CS1 to OUT1 ........................................................-0.2V to +0.2V Continuous Power Dissipation (T = +70NC) A CS2 to OUT2 ........................................................-0.2V to +0.2V TQFN (derate 37mW/NC above +70NC).....................2963mW CS3P to CS3N ......................................................-0.2V to +0.2V QFND (derate 29.4mW/NC above +70NC)...............2350mW BIAS, FSYNC, FOSC to AGND .............................-0.3V to +6.0V Operating Temperature Range...................... -40NC to +125NC COMP1, COMP2, BSTON to AGND .....................-0.3V to +6.0V Junction Temperature Range ..........................................+150NC FB1, FB2, FSELBST, EXTVCC to AGND ..............-0.3V to +6.0V Storage Temperature Range ............................ -65NC to +150NC DL to PGND (Note 1) ........................................-0.3V to +6.0V Lead Temperature (soldering, 10s) ................................+300NC BST to LX (Note 1) ...........................................-0.3V to + 6.0V Soldering Temperature (reflow)...................................... +260NC DH to LX (Note 1) ............................................-0.3V to + 6.0V 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 2) TQFN QFND Junction-to-Ambient Thermal Resistance (q ) ..........27C/W Junction-to-Ambient Thermal Resistance (q ) ..........34C/W JA JA Junction-to-Case Thermal Resistance (q ) .................1C/W Junction-to-Case Thermal Resistance (q ) ..............3.9C/W JC 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 = 14V, V = 5V, C = 6.8F, T = T = -40NC to +125NC, unless otherwise noted.) (Note 3) IN BIAS BIAS A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT SYNCHRONOUS STEP-DOWN DC-DC CONVERTERS Normal operation 3.5 36 t < 1s 42 Supply Voltage Range V V IN With preboost after initial startup condition 2.0 36 is satisfied V = V = V = 0V 8 20 EN1 EN2 EN3 V = 5V, V = 5V, V = V = EN1 OUT1 EN2 EN3 30 40 0V, V = 5V, no switching EXTVCC V = 5V, V = 3.3V, V = V = EN2 OUT2 EN1 EN3 Supply Current I FA IN 20 30 0V, V = 3.3V, no switching EXTVCC V = V = 5V, V = 5V, V = EN1 EN2 OUT1 OUT2 3.3V, V = 0V, V = 3.3V, 25 40 EN3 EXTVCC no switching V = V , PWM mode 4.95 5 5.05 FB1 BIAS Buck 1 Fixed Output Voltage V V OUT1 V = V , skip mode 4.95 5 5.075 FB1 BIAS V = V , PWM mode 3.234 3.3 3.366 FB2 BIAS Buck 2 Fixed Output Voltage V V OUT2 V = V , skip mode 3.234 3.3 3.4 FB2 BIAS Output Voltage Adjustable Buck 1, buck 2 1 10 V Range Maxim Integrated 2 www.maximintegrated.com