POWER LOSS (mW) LT3463/LT3463A Dual Micropower DC/DC Converters with Schottky Diodes FEATURES DESCRIPTIO n Generates Well-Regulated Positive and The LT 3463/LT3463A are dual micropower DC/DC con- Negative Outputs verters with internal Schottky diodes in a 10-lead 3mm n Low Quiescent Current: 3mm DFN package. Negative and positive LT3463 con- 20m A (per Converter) in Active Mode verters have a 250mA current limit. The LT3463A positive <1m A in Shutdown Mode converter also has a 250mA limit, while the negative n Internal 42V Power Switches converter has a 400mA limit. Both devices have an input n Internal 42V Schottky Diodes voltage range of 2.4V to 15V, making them ideal for a wide n Low V Switch: 180mV at 150mA variety of applications. Each converter features a quies- CESAT n Input Voltage Range: 2.4V to 15V cent current of only 20m A, which drops to under 1m A in n High Output Voltages: Up to 40V shutdown. A current limited, fixed off-time control scheme n Low Profile (0.8mm) 3mm x 3mm DFN Package conserves operating current, resulting in high efficiency over a broad range of load current. The 42V switch enables U high voltage outputs up to 40V to be easily generated APPLICATIO S without the use of costly transformers. The low 300ns off- n CCD Bias time permits the use of tiny, low profile inductors and n LCD Bias capacitors to minimize footprint and cost in space-con- n Handheld Computers scious portable applications. n Digital Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO CCD Bias Supply (15V, 8V) Efficiency and Power Loss 10H 80 240 V V IN OUT1 V = 3.6V IN 15V 2.7V 15V EFFICIENCY 10mA TO 5V 1M 75 200 4.7F 2.2F V SW1 V IN OUT1 70 160 90.9k 8V EFFICIENCY SHDN1 FB1 65 120 LT3463A V REF SHDN2 FB2 154k 60 80 GND SW2 D2 15V LOSS 55 40 8V LOSS 1M 10pF 1F 50 0 10H V OUT2 0.1 1 10 100 8V LOAD CURRENT (mA) 50mA 4.7F 3463 TA01b 3463 TA01a 3463f 1 EFFICIENCY (%) U ULT3463/LT3463A UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V , SHDN1, SHDN2 Voltage ................................... 15V ORDER PART IN SW1, SW2, V Voltage ....................................... 42V NUMBER OUT1 V 1 10 FB1 OUT1 D2 Voltage ............................................................. 42V SW1 2 9 SHDN1 11 LT3463EDD V 3 8 SHDN2 IN FB1, FB2 Voltage Range .............................. 0.3V to 2V SW2 4 7 V LT3463AEDD REF Junction Temperature........................................... 125 C D2 5 6 FB2 Operating Ambient Temperature Range DD PART MARKING DD PACKAGE (Note 2) .............................................. 40 C to 85 C 10-LEAD (3mm 3mm) PLASTIC DFN LAFC Storage Temperature Range ................. 65 C to 125 C T = 125 C, q = 43 C/W, q = 3 C/W JMAX JA JC EXPOSED PAD (PIN 11) IS GND LBJK AND MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 2.5V, V = 2.5V unless otherwise noted. A IN SHDN PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage 2.2 2.4 V Total Quiescent Current For Both Switchers, Not Switching 40 60 m A Shutdown Current V = V = 0V 0.1 1 m A SHDN1 SHDN2 V Pin Voltage With 124kW to GND l 1.23 1.25 1.27 V REF V Pin Voltage Line Regulation With 124kW to GND 0.05 0.10 %/V REF FB1 Comparator Trip Voltage High to Low Transition l 1.225 1.25 1.275 V FB1 Comparator Hysteresis 8mV FB1 Line Regulation 2.5V < V < 15V 0.05 0.10 %/V IN FB1 Pin Bias Current (Note 3) V = 1.3V l 20 50 nA FB1 FB2 Comparator Trip Voltage Low to High Transition l 03 12 mV FB2 Comparator Hysteresis 8mV FB2 Line Regulation (V V ) 2.5V < V < 15V 0.05 0.10 %/V REF FB2 IN FB2 Pin Bias Current (Note 4) V = 0.1V l 20 50 nA FB2 SW1 Switch Off Time V V = 4V 300 ns OUT1 IN V V = 0V 1.5 m s OUT1 IN SW2 Switch Off Time V < 0.1V 300 ns FB2 V = 1V 1.5 m s FB2 Switch V (SW1, SW2) I = 150mA 180 mV CESAT SW Switch Current Limit (SW1) 180 250 320 mA Switch Current Limit (SW2) LT3463 180 250 320 mA LT3463A 320 400 460 mA Swith Leakage Current (SW1, SW2) Switch Off, V = 42V 0.01 1 m A SW Schottky Forward Voltage (V , D2) I = 150mA 750 mV OUT1 D Schottky Reverse Leakage Current V V = 42V 1 5 m A OUT1 SW V = 42V 1 5 m A D2 SHDN1 Pin Current V = 2.5V 4 10 m A SHDN1 SHDN2 Pin Current V = 2.5V 4 10 m A SHDN2 SHDN1/SHDN2 Start-Up Threshold 0.3 1 1.5 V Note 1: Absolute Maximum Ratings are those values beyond which the life operating ambient temperature range are assured by design, of a device may be impaired. characterization and correlation with statistical process controls. Note 2: The LT3463/LT3463A are guaranteed to meet performance Note 3: Bias current flows into the FB1 pin. specifications from 0 C to 70 C. Specifications over the 40 C to 85 C Note 4: Bias current flows out of the FB2 pin. 3463f 2 U WWW