EVALUATION KIT AVAILABLE MAX16948 Automotive Dual Remote Antenna Current-Sense LDO/Switch General Description Features The MAX16948 is a dual high-voltage, current-sensing low S 2-Channel LDO/Switch with Precision-Adjustable dropout linear regulator (LDO)/switch designed to operate Current-Sense (Up to 300mA Per Channel) with an input voltage range from 4.5V to 28V (45V load S Wide Input Voltage Range: 4.5V to 28V (45V Load dump tolerant). The device provides phantom power over Dump Tolerant) coax cable to remote radio frequency low-noise amplifiers (LNAs) in automotive systems with a maximum current of S On/Off Switching or Regulation of Phantom Power 300mA per channel. The device also provides a fixed regu- Under C Control lated output voltage of 8.5V or an adjustable 1V to 12.5V out- S Reverse Current Protection put voltage. The device can also be configured as a switch. S Output Short-to-Battery Protection The device monitors the load current and provides an ana- S Load Current Monitoring to Detect Open-Load/ log output current proportional to the sensed load current. Normal/Short-Circuit Conditions Accurate internal current limits protect the input supply against both overcurrent and short-circuit conditions. The S Open-Drain Error Status Signaling to C device features an open-drain error output for each channel to S Input Overvoltage Shutdown indicate to the microcontroller (FC) when a fault has occurred. S High Power-Supply Rejection Ratio (73dB) The device features short-to-battery protection to latch off the internal LDO/switch during a short-to-battery event. During a Applications thermal overload, the device reduces power dissipa tion by going into thermal shutdown. It includes two independent Remote LNA Phantom Power active-low, high-voltage-compatible shutdown inputs to place each channel in a low-power shutdown mode. Automotive Camera and Sensor Power The device is available in a 16-pin TQFN package with Ordering Information appears at end of data sheet. exposed pad, a 16-pin QSOP package with exposed For related parts and recommended products to use with this part, pad, or a 16-pin QSOP package and is fully specified refer to www.maximintegrated.com/MAX16948.related. over the -40NC to +105NC temperature range. Typical Operating Circuits BATTERY INPUT DIN CIN1 CIN2 CABLE C SUPPLY L 1 L OUT1 LOAD1 IN OUT1 R R PU1 PU2 C D OUT1 OUT1 R1 C R 1 LOAD1 LOAD1 ERR1 ERROR FLAGS FB1 ERR2 REG R2 1 C REG MAX16948 LIM1 SENSE1 CLIM1 RLIM2 R C SENSE1 SENSE1 CURRENT-SENSE OUTPUTS TO ADC CABLE L 2 L OUT2 LOAD2 OUT2 SENSE2 C D OUT2 OUT2 R12 CLOAD2 RLOAD2 R CSENSE2 SENSE2 FB2 R2 2 SHDN1 OFF ON SHDN2 LIM2 GND C R LIM2 LIM2 Typical Operating Circuits continued at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6054 Rev 2 5/13 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX16948 Automotive Dual Remote Antenna Current-Sense LDO/Switch ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Operating Temperature Range ....................... -40NC to +105NC IN, SHDN1, SHDN2 ...............................................-0.3V to +45V Storage Temperature Range ........................... -65NC to +150NC ERR1, ERR2, REG ............................................... -0.3V to +6.0V Junction Temperature .....................................................+150NC FB1, FB2, SENSE1, SENSE2, LIM1, LIM2 ..-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) ................................+300NC REG N OUT1, OUT2 ..........................................................-0.3V to +20V Soldering Temperature (reflow) ......................................+260 C Continuous Power Dissipation (T = +70NC) A TQFN-EP (derate 25.0mW/NC above +70NC) ............2000mW QSOP-EP (derate 22.7mW/NC above +70NC) ...........1818mW QSOP (derate 9.5mW/NC above +70NC) .....................762mW PACKAGE THERMAL CHARACTERISTICS (Note 1) TQFN-EP 16 QSOP Junction-to-Ambient Thermal Resistance (B ) ..........40NC/W Junction-to-Ambient Thermal Resistance (B ) ........105NC/W JA JA Junction-to-Case Thermal Resistance (B ) .................6NC/W Junction-to-Case Thermal Resistance (B ) ...............37NC/W JC JC 16 QSOP-EP Junction-to-Ambient Thermal Resistance (B ) ..........44NC/W JA Junction-to-Case Thermal Resistance (B ) .................6NC/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. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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 = 14V, T = T = -40NC to +105NC, unless otherwise noted. Typical values are at T = T = +25NC.) (Note 2) IN A J A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SWITCH/LDO Over 19V, output and current sense is 4.5 28 switched off (Note 3) IN Operating Supply Range V V IN Output switched off, for < 1s (Note 3) 45 IN Supply Current in Operation I V > 2.8V, T = +25NC 2.1 3.4 mA IN SHDN1/SHDN2 A SHDN1 = SHDN2 = GND, T = +25NC, A IN Supply Current in Shutdown I 7 FA SD V = 12V IN V rising 4.8 IN IN Undervoltage Lockout V V UVL V falling 3.8 4.45 IN IN Undervoltage Lockout V 390 mV UVL-HYS Hysteresis Measured between IN and OUT1/OUT2, I 100mA, FB1/FB2 = GND, OUT1/OUT2 = 0.3V SW operation V R 5V, T = +105NC IN A (Note 4) Voltage Drop of Internal Switch V - V V IN OUT1/OUT2 Measured between IN and OUT1/OUT2, I = 100mA, FB1/FB2 = GND, 0.145 0.220 OUT1/OUT2 SW operation V R 5V, T = +25NC IN A Maxim Integrated 2