EVALUATION KIT AVAILABLE MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator General Description Features The MAX5092A/MAX5092B/MAX5093A/MAX5093B low- Wide Operating Input Voltage Range: 3.5V to 72V with a 4V Startup Voltage quiescent-current, low-dropout (LDO) regulators contain simple boost preregulators operating at a high fre- LDO Output Regulates to 5V Seamlessly from an quency. The devices seamlessly provide a preset 3.3V Input Voltage of 3.5V to 72V (MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B) Up to 250mA Output Current LDO output voltage from a cold-crank through load-dump Preset 3.3V, 5V, or Externally Programmable LDO (3.5V to 80V) input voltage conditions. The MAX5092 / Output Voltage from 1.5V to 9V (MAX5092 ) or from MAX5093 deliver up to 250mA with excellent load and 1.5V to 10V (MAX5093 ) line regulation. During normal operation, when the battery Preset 7V or Externally Programmable Boost is healthy, the boost preregulator is completely turned off, Output Voltage Up to 11V (MAX5092 ) or Up to 12V reducing quiescent current to 65A (typ). This makes the (MAX5093 ) devices suitable for always-on power supplies. 65A Quiescent Current in LDO Mode (V 8V) IN The buck-boost operation achieved by this combination of 5A Shutdown Current LDO and boost preregulator offers the advantage of using a single off-the-shelf inductor in place of the multiple- Power-On Reset (RESET) with Programmable Timeout Period winding custom magnetics needed in typical single-ended primary inductor converter (SEPIC) and transformer- Output Short-Circuit and Thermal Protection based flyback topologies. The high operating frequency TQFN Package Capable of Dissipating Up to 2.7W at of the boost regulator significantly reduces component +70C size. The MAX5092 integrates a blocking diode to fur- Ordering Information ther reduce the external component count. The boost preregulator output voltage is preset to 7V. Both LDO and PART TEMP RANGE PIN-PACKAGE boost output voltages are programmable using external MAX5092AATE+ -40C to +125C 16 TQFN-EP* resistors. The boost preregulator output voltage is adjust- able up to 11V(MAX5092 ), or up to 12V (MAX5093 ). MAX5092BATE+ -40C to +125C 16 TQFN-EP* The LDO output voltage is adjustable from 1.5V to 9V MAX5093AATE+ -40C to +125C 16 TQFN-EP* (MAX5092 ) or from 1.5V to 10V (MAX5093 ). MAX5093BATE+ -40C to +125C 16 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. The devices feature a shutdown mode with 5A (typ) shut- *EP = Exposed pad. down current, a HOLD input to implement a self-holding cir- cuit, and a power-on-reset output (RESET) with an externally Pin Configuration programmable timeout period. Additional features include output overload, short-circuit, and thermal protection. TOP VIEW The MAX5092 /MAX5093 are available in a thermally 12 11 10 9 enhanced, 16-pin 5mm x 5mm thin QFN package and can dissipate up to 2.7W at +70C on a multilayer PC BSFB 13 8 OUT board (PCB). VL 14 MAX5092 / 7 OUT SENSE Applications MAX5093 Industrial CT 15 6 SET RESET 16 5 PGND LDO + 1 2 3 4 Typical Operating Circuit and Selector Guide appear at end THIN QFN (5mm x 5mm) of data sheet. 19-0659 Rev 2 10/14 IN PGND BST EN LX SGND LX HOLD BSOUTMAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Absolute Maximum Ratings IN, EN, LX, BSOUT to SGND..................................-0.3V to +80V RESET Sinking Current.........................................................5mA PGND BST, PGND LDO to SGND.......................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) A RESET, OUT, OUT SENSE to SGND....................-0.3V to +12V Thin QFN (derate 33.3mW/C BSOUT to LX (MAX5092 )......................................-0.3V to +12V above +70C)...............................................2666mW (Note 1) VL, SET, BSFB, SGND..............................................-0.3V to +6V Operating Temperature Range .........................-40C to +125C HOLD to SGND.....................................-0.3V to (V + 0.3V) Maximum Junction Temperature .....................................+150C OUT CT to SGND................................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C VL OUT Current (I ) Short Circuit to PGND LDO, Lead Temperature (soldering, 10s) .................................+300C OUT (V 28V).............................................................Continuous IN Note 1: As per JEDEC Standard 51 (Multilayer Board). 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 (V = V = 14V, I = 1mA, C = 47F, C = 22F, C = 10F, C = 1F, T = T = -40C to +125C, unless otherwise IN EN OUT IN BSOUT OUT VL A J noted. See Figures 47 as applicable. Typical specifications are at T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY Input Voltage Range V (Note 3) 4 72 V IN V V falling 3.0 3.2 3.4 Internal Input Undervoltage UVLOF IN V Lockout V V rising 3.4 3.6 3.8 UVLOR IN LDO mode, T = -40C to +125C J 65 85 Supply Current (Boost Converter I = 100A (Note 4) I OUT A Q Off) LDO mode, I = 250mA 70 100 OUT Supply Current (Boost Converter I V = 5V 0.4 1.0 mA S IN On) T = -40C to +125C J Shutdown Supply Current I V +0.4V 6 10 A SHDN EN (Note 4) BOOST CONVERTER Minimum BSOUT Output Current I V = 4V 250 mA BSOUT IN Boost Converter Enable V V V falling (Note 5) 1.7 2.0 2.3 V BST EN BSOUT OUT Threshold Boost Converter Disable V V V rising (Note 5) 2.2 2.5 2.8 V BST DIS BSOUT OUT Threshold Boost Converter Disable V 0.5 V BST HYS Hysteresis BSOUT Output Voltage V V = 4V, BSFB = SGND, V = 5V 7.00 V BSOUT IN OUT MAX5092 11 Maximum BSOUT Output Voltage V V BSOUT(MAX) MAX5093 12 BSFB Regulation Voltage V 1.18 1.24 1.30 V BSFB BSFB Input Bias Current I 100 nA BSFB Boost Internal Switch R 0.5 1.2 DS(ON) On-Resistance Boost Internal Switch Minimum t 0.80 1 1.25 s OFF Off-Time Maxim Integrated 2 www.maximintegrated.com