LTC2970/LTC2970-1 2 Dual I C Power Supply Monitor and Margining Controller Fea T Descrip T n Less Than 0.5% Total Unadjusted Error 14-Bit D The LTC 2970 is a dual power supply monitor and margin- 2 ADC with On-Chip Reference ing controller with an SMBus compatible I C bus interface. n Dual, 8-Bit IDACs with 1x Voltage Buffers A low-drift, on-chip reference and 14-bit A/D converter n Linear, Voltage Servo Adjusts Supply Voltages by allow precise measurements of supply voltages, load Ramping IDAC Outputs Up/Down currents or internal die temperature. Fault management 2 n I C Bus Interface (SMBus Compatible) allows ALERT to be asserted for configurable overvoltage n Extensive, User Configurable Fault Monitoring and undervoltage fault conditions. Two voltage buffered, n On-Chip Temperature Sensor 8-bit IDACs allow highly accurate programming of DC/DC n Available in 24-Pin 4mm 5mm QFN Package converter output voltages. The IDACs can be configured to automatically servo the power supplies to the desired voltages using the ADC. The LTC2970-1 adds a tracking a T feature that can be used to turn multiple power supplies n Dual Power Supply Voltage Servo on or off in a controlled manner. n Monitoring Supply Voltage and Current The bus address is set to 1 of 9 possible combinations by n Programmable Power Supplies pin strapping the ASEL0 and ASEL1 pins. The LTC2970/ n Programmable Reference LTC2970-1 are packaged in a 24-pin, 4mm 5mm QFN package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Dual Power Supply Monitor and Controller (One of Two Channels Shown) ADC Total Unadjusted Error vs Temperature 8V TO 15V 0.50 0.1F 16 PARTS MOUNTED ON PCB 12V IN V IN OUT V IN DD 0.25 1/2 LTC2970 0.1F GPIO CFG I+ V IN0 BP 0 I V ALERT IN0 BM DC/DC 2 V SCL I C BUS OUT0 CONVERTER SMBUS 0.25 SDA V ( ) IN0 AP COMPATIBLE ADC VIN = 5V RUN/SS FB LOAD I GPIO 0 OUT0 0.50 50 25 0 25 50 75 100 125 150 TEMPERATURE (C) SGND V IN0 AM REF GND 29701 TA01b GND ASEL0 ASEL1 0.1F 29701 TA01 29701fe 1 For more information www.linear.com/LTC2970 ERROR (%) ion pplica ions pplica ion uresLTC2970/LTC2970-1 a Te Maxi Mu M r a T p c F T (Notes 1 and 2) TOP VIEW Supply Voltages: V .......................................................... 0.3V to 6V DD 12V ..................................................... 0.3V to 15V IN 24 23 22 21 20 Digital Input/Output Voltages: V 1 19 SDA IN0 AP ASEL0, ASEL1 ............................. 0.3V to V + 0.3V V 2 18 SCL DD IN0 AM V 3 17 ALERT SDA, SCL, GPIO CFG, IN0 BP 25 V 4 16 GPIO 0 IN0 BM ALERT, GPIO 0, GPIO 1........................... 0.3V to 6V GND V 5 15 GPIO 1 IN1 AP Analog Voltages: V 6 14 I IN1 AM OUT0 V , V , V , IN0 AP IN0 AM IN0 BP V 7 13 I IN1 BP OUT1 V , V , V , 8 9 10 11 12 IN0 BM IN1 AP IN1 AM V , V , V , V ............... 0.3V to 6V IN1 BP IN1 BM OUT0 OUT1 I , I , REF ......................... 0.3V to V + 0.3V OUT0 OUT1 DD UFD PACKAGE RGND .................................................... 0.3V to 0.3V 24-LEAD (4mm 5mm) PLASTIC QFN Operating Ambient Temperature Range: T = 150C, = 34C/W, = 3C/W JMAX JA JC EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB LTC2970C ................................................ 0C to 70C LTC2970I .............................................40C to 85C LTC2970H .......................................... 40C to 125C Storage Temperature Range .................. 65C to 150C