EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX1530/MAX1531 Multiple-Output Power-Supply Controllers for LCD Monitors General Description Features The MAX1530/MAX1531 multiple-output power-supply 4.5V to 28V Input Voltage Range controllers generate all the supply rails for thin-film 250kHz/500kHz Current-Mode Step-Down Converter transistor (TFT) liquid-crystal display (LCD) monitors. Small Inductor/Capacitors Both devices include a high-efficiency, fixed-frequen- No Sense Resistor cy, step-down regulator. The low-cost, all N-channel, Three Positive Linear Regulator Controllers synchronous topology enables operation with efficiency One Positive and One Negative Additional as high as 93%. High-frequency operation allows the use Controller (MAX1531) of small inductors and capacitors, resulting in a compact Small Input and Output Capacitors solution. The MAX1530 includes three linear regulator Timed Reset Output controllers and the MAX1531 includes five linear regula- Uncommitted Overcurrent Protection (MAX1531) tor controllers for supplying logic and LCD bias voltages. A programmable startup sequence enables easy control Soft-Start for All Regulators of the regulators. Programmable Input Undervoltage Comparator The MAX1530/MAX1531 include soft-start functions to Programmable Startup Sequencing limit inrush current during startup. An internal stepdown Minimal Operating Circuit converter current-limit function and a versatile overcurrent shutdown protect the power supplies against fault conditions. V V V IN IN P The MAX1530/MAX1531 use a currentmode control CSH architecture, providing fast load transient response and V V N L easy compensation. An internal linear regulator provides CSL MOSFET gate drive and can be used to power small BST V = 12V IN external loads. IN DRV4 The MAX1530/MAX1531 can operate from inputs as V DH OUT VSOURCE FBL4 high as 28V and are well suited for LCD monitor and TV 3.3V/1.5A 10V/500mA LX applications running directly from AC/DC wall adapters. MAX1530 DL Both devices are available in a small (5mm x 5mm), ultra- PGND EN thin (0.8mm), 32-pin QFN package and operate over the ILIM FB -40C to +85C temperature range. FREQ VL VL COMP Applications AGND RESET LCD Monitors and TVs RSTIN V IN Ordering Information V OUT DRV2 PART TEMP RANGE PIN-PACKAGE DRV1 V GAMMA FBL2 -9.7V MAX1530ETJ+ -40C to +85C 32 TQFN-EP* V LOGIC FBL1 25V/500mA MAX1530ETJ+T -40C to +85C 32 TQFN-EP* MAX1531ETJ+ -40C to +85C 32 TQFN-EP* ONL2 ONL3 ONL4 MAX1531ETJ+T -40C to +85C 32 TQFN-EP* VL SEQ ONL5 +Denotes a lead(Pb)-free/RoHS-compliant package. VP V IN T = Tape and reel. DRV3 DRV5 *EP = Exposed pad. V GON V GOFF FBL3 FBL5 25V Pin Configuration appears at end of data sheet. -9V 19-2866 Rev 4 8/19MAX1530/MAX1531 Multiple-Output Power-Supply Controllers for LCD Monitors Absolute Maximum Ratings IN, DRV1, DRV2, DRV3, DRV4, CSH, SEQ, ONL2, ONL3, ONL4, ONL5, COMP, CSL to AGND ....................................................-0.3V to +30V ILIM to AGND...........................................-0.3V to (VL + 0.3V) DRV5 to VL .............................................................-28V to +0.3V RSTIN, RESET, EN, FB, FBL1, FBL2, FBL3, FBL4, FBL5, CSH to CSL ..............................................................-0.3V to +6V FREQ to AGND....................................................-0.3V to +6V VL to AGND..............................................................-0.3V to +6V VL Short Circuit to AGND ...........................................Momentary PGND to AGND...................................................................0.3V Continuous Power Dissipation (T = +70C) A LX to BST..................................................................-6V to +0.3V 32-Pin Thin QFN (derate 21.3mW/C above +70C) ...1702mW BST to AGND..........................................................-0.3V to +36V Operating Temperature Range ...........................-40C to +85C DH to LX .....................................................-0.3V to (BST + 0.3V) Storage Temperature Range .............................-65C to +150C DL to PGND ..................................................-0.3V to (VL + 0.3V) Junction Temperature......................................................+150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 (Circuit of Figure 1, V = 12V, V = V = 5V, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) IN EN SEQ A A PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL Operating Input Voltage Range (Note 1) 4.5 28.0 V V = V = V = V = FB FBL1 FBL2 FBL3 Quiescent Supply Current 1.7 3.0 mA V = 1.5V, V = 0V FBL4 FBL5 IC Disable Supply Current EN = AGND 200 400 A VL REGULATOR VL Output Voltage 5.5V < V < 28V, 0 < I < 30mA 4.75 5 5.25 V IN VL VL Undervoltage Lockout Threshold VL rising, 3% hysteresis 3.2 3.5 3.8 V CONTROL AND SEQUENCE SEQ, FREQ Input Logic High Level 2.0 V SEQ, FREQ Input Logic Low Level 0.6 V SEQ, FREQ Input Leakage Current -1 +1 A ONL Input Threshold ONL rising, 25mV hysteresis 1.201 1.238 1.275 V ONL Source Current SEQ = EN = VL, V = 0 to 1.24V 1.8 2.0 2.2 A ONL ONL Input Leakage Current SEQ = EN = VL, ONL = VL -500 +500 nA ONL Input Discharge Clamp Resistance V = 0V 800 1500 3000 SEQ EN Input Threshold EN rising, 5% hysteresis 1.201 1.238 1.275 V EN Input Leakage Current -50 +50 nA FAULT DETECTION FB, FBL1, FBL2, FBL3, FBL4 FB, FBL1, FBL2, FBL3, FBL4 falling, 1.081 1.114 1.147 V Undervoltage Fault Trip Level 25mV hysteresis FBL5 Undervoltage Fault Trip Level FBL5 rising, 25mV hysteresis 300 400 500 mV Maxim Integrated 2 www.maximintegrated.com