MAX15157B 60V Current Mode Buck Controller with Accurate Current Report General Description Benefits and Features The MAX15157B belongs to the family of MAX15157 Wide Operating Range Reduces Development Time 4-switch, buckboost controllers. MAX15157B drives two 8V to 60V Input-Voltage Range external MOSFETs in half-bridge buck configuration. The 3V to 56V Output-Voltage Range output voltage can be dynamically set through the 1V to 120kHz to 1MHz Switching-Frequency Range 2.2V reference input (REFIN) for modular design support. -40C to +125C Temperature Range The switching frequency is controlled either through an Integration Reduces Design Footprint external resistor that sets the internal oscillator frequency, Internal LDO for Bias-Supply Generation or by synchronizing the regulator to an external clock. Synchronization Input The device is designed to support 120kHz to 1MHz Current-Monitor Output switching frequencies. The controller has a dedicated undervoltage-lockout pin (UVLO) and an accurate enable- Robust Fault Protection Improves Quality and input threshold for flexible power-sequence configuration. Simplifies System Design The controller also has multiple fault-protection circuits Adjustable Input Undervoltage Lockout to protect against overcurrent (OCP), output overvoltage Average and Cycle-by-Cycle Overcurrent Protection (OVP), input UVLO and thermal shutdown. Input Undervoltage-Fault Protection The MAX15157B features an adjustable internal com- Multiple Levels of Overvoltage Protection pensation ramp. The device incorporates an accurate Thermal Shutdown current-sense amplifier that reports output current through Adjustable Slope Compensation an analog output (IMON). The device allows single-phase or multiphase (up to four-phase) operation. Multiphase Support The device is footprint compatible with MAX15157 Small 5mm x 5mm, 32-pin TQFN, 0.5mm Pitch and is available in a 5mm x 5mm, 32-pin TQFN package and supports a -40C to +125C junction temperature range. Applications Communication Industrial Ordering Information appears at end of data sheet. Automotive Typical Application Circuit 8V to 60V INPUT 6V to 14V BIA S DRV 3V to 56V OUTPUT IN UVLO CSHP CURRENT-SENSE MONITOR CSHN RAMP MAX15157B SS ENABLE EN 1V to 2.2V DAC REFIN MOSFET DRIVERS SYSTEM CLK FREQ/CLK COMP 4V6 BUCK POWER STAGE CSLP 50X CURRENT MONITOR OUTPUT IMON CURRENT-SENSE CONTROL CSLN OPEN-DRAIN POWER GOOD PGOOD SYNCIN OVP SYNCOUT MULTI-PHASE SUPPORT / SYNCHRONIZATION FB PHASE CSIO 19-8722 Rev 0 1/17MAX15157B 60V Current Mode Buck Controller with Accurate Current Report Absolute Maximum Ratings IN to PGND ...........................................................-0.3V to +65V EN, FB, PGOOD, REFIN to AGND .........................-0.3V to +6V CSLP, CSLN to PGND .........................................-0.3V to +0.3V UVLO, OVP, FREQ/CLK, SYNCIN to AGND ..........-0.3V to +6V CSLP to CSLN .....................................................-0.3V to +0.3V COMP, SS, IMON, RAMP to AGND ........ -0.3V to (V + 0.3V) 4V6 CSHP, CSHN to PGND .........................................-0.3V to +65V SYNCOUT, PHASE to AGND .................. -0.3V to (V + 0.3V) 4V6 CSHP to CSHN ....................................................-0.3V to +0.3V CSION, CSIOP to AGND......................... -0.3V to (V + 0.3V) 4V6 LX to PGND...........................................................-1.0V to +65V PGND to AGND ....................................................-0.3V to +0.3V LX + DRV ........................................................................ < +80V Maximum Current out of 4V6 ...........................................100mA LX to PGND less than 50ns .................................................. -2V Operating Temperature Range ......................... -40C to +125C BST to PGND ........................................................-0.3V to +80V Continuous Power Dissipation (T = +70C) A BST to LX ..............................................................-0.3V to +16V TQFN (derate 34.5mV/C above +70C)..........-0.3V to +0.3V DH to LX ..................................................-0.3V to (V + 0.3V) Junction Temperature ......................................................+150C BST DL to PGND ...........................................-0.3V to (V + 0.3V) Storage Temperature Range ............................ -40C to +150C DRV DRV to PGND .......................................................-0.3V to +16V Lead Temperature (soldering, 10s) .................................+300C 4V6 to AGND ...........................................................-0.3V to +6V Soldering Temperature (reflow) .......................................+240C DRV to 4V6 ...........................................................-0.3V to +16V 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 Information 32 TQFN Package Code T3255+4 Outline Number 21-0140 Land Pattern Number 90-0012 THERMAL RESISTANCE, SINGLE-LAYER BOARD Junction to Ambient ( ) +29C/W JA Junction to Case ( ) +1.7C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 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. Maxim Integrated 2 www.maximintegrated.com