EVALUATION KIT AVAILABLE MAX5098A Dual 2.2MHz Buck or Boost Converter with 80V Load-Dump Protection General Description Features The MAX5098A is a dual-output, high-switching- Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage frequency DC-DC converter with integrated n-channel Range (with Up to 80V Load-Dump Protection) switches that can be used either in high-side or low- Dual-Output DC-DC Converter with Integrated Power side configuration. Each output can be configured either MOSFETs as a buck converter or a boost converter. In the buck Each Output Configurable in Buck or Boost Mode configuration, this device delivers up to 2A from converter 1 and 1A from converter 2. The MAX5098A also Adjustable Outputs from 0.8V to 0.85V Buck IN integrates a load-dump protection circuitry that is capable Configuration) and from V to 28V (Boost IN of handling load-dump transients up to 80V for industrial Configuration) applications. The load-dump protection circuit utilizes I and I of 2A and 1A (Respectively) in OUT1 OUT2 an internal charge pump to drive the gate of an external Buck Configuration n-channel MOSFET. When an overvoltage or load-dump condition occurs, the series protection MOSFET absorbs Switching Frequency Programmable from 200kHz to the high-voltage transient to prevent damage to lower- 2.2MHz voltage components. Synchronization Input (SYNC) The DC-DC converters operate over a wide operating Clock Output (CKO) for Four-Phase Master-Slave voltage range from 4.5V to 19V. The MAX5098A operates Operation 180 out-of-phase with an adjustable switching frequency to minimize external components while allowing the ability Individual Converter Enable Input and Power-Good to make trade-offs between the size, efficiency, and cost. Output This device utilizes voltage-mode control for stable Low-I (7A) Standby Current (ON/OFF) Q operation and external compensation thus, the loop gain Internal Digital Soft-Start and Soft-Stop is tailored to optimize component selection and transient Short-Circuit Protection on Outputs and Maximum response. This device can be synchronized to an external Duty-Cycle Limit clock fed at the SYNC input. Also, a clock output (CKO) allows a master-slave connection of two devices with a Overvoltage Protection on Outputs with Auto Restart four-phase synchronized switching sequence. Additional Thermal Shutdown features include internal digital soft-start, individual enable for each DC-DC regulator (EN1 and EN2), open-drain Thermally Enhanced 32-Pin TQFN Package power-good outputs (PGOOD1 and PGOOD2), and a Dissipates Up to 2.7W at +70C shutdown input (ON/OFF). Ordering Information Other features of the MAX5098A include overvolt- age protection, short-circuit (hiccup current limit), and PART TEMP RANGE PIN-PACKAGE thermal protection. The MAX5098A is available in MAX5098AATJ+ -40C to +125C 32 TQFN-EP* a thermally enhanced, exposed pad, 5mm x 5mm, +Denotes a lead(Pb)-free/RoHS-c ompliant package. 32-pin TQFN package and is fully specified over the *EP = Exposed pad. -40C to +125C temperature range. Applications Industrial Pin Configuration appears at end of data sheet. 19-4111 Rev 1 10/14MAX5098A Dual 2.2MHz Buck or Boost Converter with 80V Load-Dump Protection Absolute Maximum Ratings V+ to SGND ..........................................................-0.3V to +25V SOURCE to PGND .............................................. -1V for 50ns V+ to IN HIGH .........................................................-19V to +6V EN to SGND ..........................................................-0.3V to +6V IN HIGH to SGND ................................................-0.3V to +19V OSC, FSEL 1, COMP , SYNC, IN HIGH Maximum Input Current ......................................60mA FB to SGND...........................................-0.3V to (V + 0.3V) L BYPASS to SGND ................................................-0.3V to +2.5V CKO to SGND ....................................... -0.3V to (VDRV + 0.3V) GATE to V+ ...........................................................-0.3V to +12V SOURCE1, DRAIN1 Peak Current ............................5A for 1ms GATE to SGND .....................................................-0.3V to +36V SOURCE2, DRAIN2 Peak Current ............................3A for 1ms SGND to PGND ..................................................-0.3V to +0.3V V , BYPASS to L V to SGND ................-0.3V to the Lower of +6V or (V+ + 0.3V) SGND Short Circuit ................ Continuous, Internally Limited L VDRV to SGND .......................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A BST1/VDD1, BST2/VDD2, DRAIN , 32-Pin TQFN-EP (derate 34.5mW/C above +70C) ...2759mW PGOOD to SGND ............................................-0.3V to +30V Operating Temperature Range ......................... -40C to +125C ON/OFF to SGND .............................-0.3V to (IN HIGH + 0.3V) Storage Temperature Range ........................... -65C to +150C BST1/VDD1 to SOURCE1, Junction Temperature ......................................................+150C BST2/VDD2 to SOURCE2...................................-0.3V to +6V Lead Temperature (soldering, 10s) ................................+300C SOURCE to SGND..............................................-0.6V to +25V Package Thermal Characteristics (Note 1) Junction-to-Ambient Thermal Resistance ( ) ...........29.0C/W JA Junction-to-Case Thermal Resistance ( ) ..................1.7C/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. 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. Electrical Characteristics (VDRV = V , V+ = V = IN HIGH = 5.2V or V+ = IN HIGH = 5.2V to 19V, EN = V , SYNC = GND, I = 0mA, PGND = SGND, L L L VL C = 0.22F (low ESR), C = 4.7F (ceramic), C = 1F (low ESR), C = 1F (ceramic), R = 3.9k , R = 10k , BYPASS VL V+ IN HIGH IN HIGH OSC T = -40C to +125C, unless otherwise noted.) (Note 2) J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS V+ = IN HIGH 5.2 19 Input Voltage Range V+ V VL = V+ = IN HIGH (Note 3) 4.5 5.5 V+ Operating Supply Current IQ VL unloaded, no switching 4.2 mA VEN = 0V, PGOOD unconnected, V+ = V+ Standby Supply Current IV+STBY 0.75 1.1 mA VIN HIGH = 14V V+ = VL = 5.2V 78 (VOUT1 = 5V at 1.5A, Efficiency h VOUT2 = 3.3V at 0.75A, V+ = 12V 76 % fSW = 1.85MHz V+ = 16V 70 OVERVOLTAGE PROTECTOR IN HIGH Clamp Voltage IN HIGH ISINK = 10mA 19 20 21 V IN HIGH Clamp Load 1mA < ISINK < 50mA 160 mV Regulation VEN = VPGOOD = VGATE = 0V, IN HIGH Supply Current IIN HIGH 270 600 A VIN HIGH = VON/OFF = 14V Maxim Integrated 2 www.maximintegrated.com