MAX15027/MAX15028 1.425V to 3.6V Input, 1A Low-Dropout Regulators with BIAS Input General Description Features The MAX15027/MAX15028 low-dropout linear regulators 1.425V to 3.6V Input Voltage Range operate from input voltages as low as 1.425V and deliver Output Voltage Programmable from 0.5V to VIN up to 1A of continuous output current with a typical dropout Guaranteed Maximum 225mV Dropout at 1A Output voltage of only 75mV. The output voltage is adjustable Current from 0.5V to V and is 2% accurate over load and line IN 2% Output Accuracy Over Load, Line, and variations, from -40C to +125C. The MAX15028 fea- tures a BIAS input of 3V to 5.5V from an always-on power Temperature supply. The BIAS input current is reduced down to less Stable with Ceramic Capacitors than 2A during shutdown. Fast Transient Response These regulators use small, 1F ceramic input capacitors 60A Operating Bias Supply Current (MAX15028) and 4.7F ceramic output capacitors to deliver 1A out- 1.2A Shutdown Bias Supply Current (MAX15028) put current. High bandwidth provides excellent transient response and limits the output voltage deviation to 15mV Short-Circuit and Thermal Protection for a 500mA load step, with only a 4.7F ceramic output -40C to +125C Operating Temperature Range capacitor, and the voltage deviations can be reduced Soft-Start Limits Inrush Current further by increasing the output capacitor. Thermally Enhanced 3mm x 3mm TDFN Package These devices offer a logic-controlled shutdown input to reduce input current (I ) consumption down to less than AEC-Q100 Qualified IN 5.5A in standby mode. Other features include a soft- start to reduce inrush current, short-circuit protection, and thermal-overload protection. The MAX15028 features a BIAS input allowing a secondary supply to keep the LDOs internal circuitry alive if the voltage on IN goes to 0V. Both devices are fully specified from -40C to +125C and are available in a 10-pin thermally enhanced TDFN package (3mm x 3mm) that includes an exposed pad for optimal power dissipation. For a 500mA version of these LDOs, refer to the MAX15029/MAX15030 data sheet. Applications Ordering Information appears at end of data sheet. Automotive (Dead-Man LDO) Servers Storage Typical Operating Circuits and Pin Configurations appear Networking at end of data sheet. Base Stations Optical Modules ATE 19-4488 Rev 3 8/16MAX15027/MAX15028 1.425V to 3.6V Input, 1A Low-Dropout Regulators with BIAS Input Absolute Maximum Ratings IN, FB, SS, I.C. to GND .......................................-0.3V to +4.0V Operating Junction Temperature Range .......... -40C to +125C BIAS to GND ...........................................................-0.3V to +6V Maximum Junction Temperature .....................................+150C EN to GND ............-0.3V to the lower of (V + 0.3V) or +6V Storage Temperature Range ............................ -65C to +150C BIAS OUT to GND .............................................. -0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C IN Output Short-Circuit Duration ....................................Continuous Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A 10-Pin TDFN, Multilayer Board (derate 24.4mW/C above +70C) ............................1951mW 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 1) Chip Information PROCESS: BiCMOS Junction-to-Ambient Thermal Resistance ( ) ............... 41C/W JA Junction-to-Case Thermal Resistance ( ) ....................9C/W JC Note 1: 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. Package Information 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 TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 10 TDFN-EP T1033+1 21-0137 90-0003 Electrical Characteristics (Circuit of Figure 1 V = 1.8V, V = 1.2V, EN = IN for MAX15027, EN = BIAS for MAX15028, I = 100mA, T = T = -40C to IN OUT OUT A J +125C. Typical values are at T = +25C, unless otherwise noted.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IN MAX15027 1.425 3.600 Input Voltage Range V V = 3V to 5.5V 1.425 3.600 V IN BIAS MAX15028 BIAS = IN 3.000 3.600 MAX15027 1.275 1.325 1.375 V rising, IN Undervoltage Lockout V V UVLO I = 2mA OUT MAX15028 1.04 1.106 1.14 Undervoltage Lockout Hysteresis V 50 mV UVLO HYST V = 1.425V to 3.6V, V = 1.2V, IN OUT 160 275 410 I = 1mA, V = 3.3V OUT BIAS Quiescent GND Current I A GND V = 3.6V, V = 3.3V, I = 100mA 180 275 560 IN OUT OUT V = 3.3V, V = 3.3V, I = 500mA 170 315 470 IN OUT OUT Input Supply Current in Shutdown I V = 0V, T = -40C to +85C 0.1 5.5 A IN SD EN A Maxim Integrated 2 www.maximintegrated.com