EVALUATION KIT AVAILABLE MAX16993 Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters General Description Benefits and Features The MAX16993 power-management integrated circuit High-Efficiency Voltage DC-DC Controller Saves (PMIC) is a 2.1MHz, multichannel, DC-DC convert- Power er designed for automotive applications. The device 3.5V to 36V Operating Supply Voltage integrates three supplies in a small footprint. The device Output Voltage: Pin Selectable, Fixed, or includes one high-voltage step-down controller (OUT1) Resistor-Divider Adjustable designed to run directly from a car battery and two low- 350kHz to 2.1MHz Operation voltage step-down converters (OUT2/OUT3) cascaded 30A Quiescent Current with DC-DC from OUT1. Under no-load conditions, the MAX16993 Controller Enabled consumes only 30A of quiescent current, making it ideal Dual 2.1MHz DC-DC Converters with Integrated for automotive applications. FETs Save Space OUT2 and OUT3 are Cascaded from OUT1, Im- The high-voltage synchronous step-down DC-DC proving Efficiency controller (OUT1) operates from a voltage up to 36V 3A Integrated FETs continuous and is protected from load-dump transients up 0.8V to 3.95V Output Voltage to 42V. There is a pin-selectable frequency option of either Fixed or Resistor-Divider-Adjustable Output Voltage 2.1MHz or a factory-set frequency for 1.05MHz, 525kHz, 180 Out-of-Phase Operation 420kHz, or 350kHz. The low-voltage, synchronous step- Robust for the Automotive Environment down DC-DC converters run directly from OUT1 and can supply output currents up to 3A. Current-Mode Architecture with Forced-PWM and Skip Modes of Operation The device provides a spread-spectrum enable input Frequency Synchronization Input/Output Reduces (SSEN) to provide quick improvement in electromagnetic System Noise interference when needed. There is also a SYNC Individual Enable Inputs and RESET Outputs input for providing an input to synchronize to Overtemperature and Short-Circuit Protection an external clock source (see the Selector Guide). AECQ-100 Qualified The device includes overtemperature shutdown and 32-Pin TQFN-EP (5mm x 5mm x 0.75mm) and overcurrent limiting. The device also includes indi- Side-Wettable QFND-EP (5mm x 5mm x 0.8mm) vidual RESET outputs and individual enable inputs. -40C to +125C Operating Temperature Range The individual RESET outputs provide voltage monitoring for all output channels. The MAX16993 is available in a 32-pin TQFN/side- wettable QFND-EP package and is specified for operation over the -40C to +125C automotive temperature range. Ordering Information and Selector Guide appear at end of Applications data sheet. Automotive Industrial 19-6684 Rev 14 12/16MAX16993 Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters Absolute Maximum Ratings V , EN1 to GND ...............................................-0.3V to +45V FB1, EN2, EN3 to GND........................................-0.3V to +6.0V SUP PV to GND..........................................................-0.3V to +6.0V RESET , ERR to GND .........................................-0.3V to +6.0V PV to GND..........................................................-0.3V to +6.0V CS1 to OUT1 ........................................................-0.3V to +0.3V PV2 to GND, PV2 to PGND2 ...............................-0.3V to +6.0V CSEL1, SSEN to GND .........................................-0.3V to +6.0V PV3 to GND, PV3 to PGND3 ...............................-0.3V to +6.0V COMP1 to GND...........................................-0.3V to PV + 0.3V PGND2PGND3 to GND......................................-0.3V to +0.3V LX2, LX3 Output Short-Circuit Duration ....................Continuous LX1 to GND ...............................................-6.0V to V + 6.0V Continuous Power Dissipation (T = +70C) SUP A BST1 to LX1 (Note 1) ...........................................-0.3V to +6.0V Side-Wettable QFND (derate 27mW/C above +70C)......2160mW DH1 to LX1 (Note 1)..................................-0.3V to BST1 + 0.3V TQFN (derate 34.5mW/C above +70C)...............2758.6mW BIAS to GND ........................................................-0.3V to +6.0V Operating Temperature Range ..........................-40C to +125C DL1 to GND (Note 1)...................................-0.3V to PV1 + 0.3V Junction Temperature ......................................................+150C LX2 to PGND2.............................................-0.3V to PV2 + 0.3V Storage Temperature Range .............................-65C to +150C LX3 to PGND3.............................................-0.3V to PV3 + 0.3V Lead Temperature (soldering, 10s) .................................+300C OUT1, CS1, OUT2, OUT3 to GND ......................-0.3V to +6.0V Soldering Temperature (reflow) .......................................+260C SYNC to GND .............................................-0.3V to PV + 0.3V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation 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) Side-Wettable QFND TQFN Junction-to-Ambient Thermal Resistance ( ) ......... 37C/W Junction-to-Ambient Thermal Resistance ( ) ......... 29C/W JA JA Junction-to-Case Thermal Resistance ( ) ............ 2.8C/W Junction-to-Case Thermal Resistance ( ) ............ 1.7C/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 = V , V = V = V T = T = -40C to +125C, unless otherwise noted. Typical values are at SUP PV1 BIAS PV2 PV3 OUT1 A J T = +25C under normal conditions, unless otherwise noted.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Startup V V rising 4.25 4.5 4.75 V SUP,STARTUP SUP Threshold Supply Voltage Range V Normal operation, after Buck 1 startup 3.5 36 V SUP V = V = V = 0V 4 15 EN1 EN2 EN3 Supply Current I A SUP V = 5V, V = V = 0V (no load) 20 40 EN1 EN2 EN3 Oscillator Frequency f 2.0 2.1 2.2 MHz SW SYNC Input Frequency 1.7 2.4 MHz Range V = V 0 SSEN GND Spread-Spectrum Range % V = V +6 SSEN BIAS BIAS Regulator Voltage V 6V V 42V, no switchover 4.6 5.0 5.4 V BIAS SUP V falling 2.5 2.7 2.9 BIAS PV POR V Hysteresis 0.45 Maxim Integrated 2 www.maximintegrated.com