LT3028 Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs FEATURES DESCRIPTIO Low Noise: 20V (10Hz to 100kHz) RMS The LT 3028 is a dual, micropower, low noise, low drop- Low Quiescent Current: 30A/Output out regulator with independent inputs. With an external Independent Inputs 0.01F bypass capacitor, output noise is a low 20V RMS Wide Input Voltage Range: 1.8V to 20V over a 10Hz to 100kHz bandwidth. Designed for use in Output Current: 100mA/500mA battery-powered systems, the low 30A quiescent current Very Low Shutdown Current: <0.1A per output makes it an ideal choice. In shutdown, quies- Low Dropout Voltage: 300mV/320mV at cent current drops to less than 0.1A. Shutdown control 100mA/500mA is independent for each output, allowing for flexibility in Adjustable Outputs from 1.22V to 20V power management. The device is capable of operating Stable with as Low as 1F/3.3F Output Capacitor over an input voltage range of 1.8V to 20V. Output 1 can Stable with Aluminum, Tantalum or supply 500mA of output current with a dropout voltage of Ceramic Capacitors 320mV. The device can supply 100mA of output current Reverse-Battery Protected from Output 2 with a dropout voltage of 300mV. Quiescent No Protection Diodes Needed current is well controlled in dropout. Overcurrent and Overtemperature Protected The LT3028 regulator is stable with output capacitors as Tracking/Sequencing Capability low as 1F for the 100mA output and 3.3F for the 500mA Thermally Enhanced 16-Lead TSSOP and 16-Lead output. Small ceramic capacitors can be used without the (5mm 3mm) DFN Packages series resistance required by other regulators. U Internal protection circuitry includes reverse-battery pro- APPLICATIO S tection, current limiting and thermal limiting protection. Cellular Phones The device is available as an adjustable device with a 1.22V Pagers reference voltage. The LT3028 regulator is available in the Battery-Powered Systems thermally enhanced 16-lead TSSOP and 16-lead, low Frequency Synthesizers profile (5mm 3mm 0.75mm) DFN packages. Wireless Modems , LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents including 6118263, 6144250. Tracking/Sequencing Power Supplies TYPICAL APPLICATIO 10Hz to 100kHz Output Noise 3.3V/2.5V Low Noise Regulators 3.3V AT 500mA OUT1 IN1 20V NOISE RMS V IN1 0.01F 10F 3.7V TO 1F SHDN1 422k 20V BYP1 ADJ1 V OUT 20V RMS 249k 100V/DIV LT3028 2.5V AT 100mA OUT2 20V NOISE IN2 RMS V IN2 0.01F 10F 261k 2.9V TO 1F SHDN2 BYP2 20V ADJ2 3028 TA01b GND 249k 3028 TA01a 3028f 1 U ULT3028 (Note 1) ABSOLUTE AXI U RATI GS IN1, IN2 Pin Voltage .............................................. 20V Operating Junction Temperature Range OUT1, OUT2 Pin Voltage ....................................... 20V (Note 2) ............................................ 40C to 125C Input-to-Output Differential Voltage....................... 20V Storage Temperature Range ADJ1, ADJ2 Pin Voltage ......................................... 7V FE Package ....................................... 65C to 150C BYP1, BYP2 Pin Voltage ....................................... 0.6V DHC Package .................................... 65C to 125C SHDN1, SHDN2 Pin Voltage ................................. 20V Lead Temperature (Soldering, 10 sec).................. 300C Output Short-Circut Duration.......................... Indefinite UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART TOP VIEW ORDER PART NUMBER NUMBER GND 1 16 GND BYP1 1 16 ADJ1 BYP1 2 15 ADJ1 NC 2 15 SHDN1 LT3028EFE LT3028EDHC OUT1 3 14 SHDN1 OUT1 3 14 IN1 LT3028IFE LT3028IDHC OUT1 4 13 IN1 OUT1 4 13 IN1 17 17 GND 5 12 IN2 GND 5 12 IN2 OUT2 6 11 SHDN2 OUT2 6 11 IN2 BYP2 7 10 ADJ2 FE PART OUT2 7 10 SHDN2 DHC PART GND 8 9 GND MARKING MARKING BYP2 8 9 ADJ2 FE PACKAGE DHC PACKAGE 3028EFE 3028 16-LEAD PLASTIC TSSOP 16-LEAD (5mm 3mm) PLASTIC DFN 3028IFE 3028I T = 150C, = 38C/ W, = 8C/ W JMAX JA JC T = 125C, = 40C/ W, = 10C/ W JMAX JA JC EXPOSED PAD (PIN 17) IS GND EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB MUST BE SOLDERED TO PCB Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25C. (Note 2) A PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage Output 2, I = 100mA 1.8 2.3 V LOAD (Notes 3, 10) Output 1, I = 500mA 1.8 2.3 V LOAD ADJ1, ADJ2 Pin Voltage V = 2V, I = 1mA 1.205 1.220 1.235 V IN LOAD (Notes 3, 4) Output 2, 2.3V < V < 20V, 1mA < I < 100mA 1.190 1.220 1.250 V IN2 LOAD Output 1, 2.3V < V < 20V, 1mA < I < 500mA 1.190 1.220 1.250 V IN1 LOAD Line Regulation (Note 3) V = 2V to 20V, I = 1mA 110 mV IN LOAD Load Regulation (Note 3) Output 2, V = 2.3V, I = 1mA to 100mA 1 12 mV IN2 LOAD V = 2.3V, I = 1mA to 100mA 25 mV IN2 LOAD Output 1, V = 2.3V, I = 1mA to 500mA 1 12 mV IN1 LOAD V = 2.3V, I = 1mA to 500mA 25 mV IN1 LOAD 3028f 2 U WWW