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LTC1703 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1703 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 36 page  8 LTC1703 1703fa regulated output voltages as low as 800mV without exter- nal level shifting amplifiers. The LTC1703’s synchronous switching logic transitions automatically into Burst Mode operation, maximizing effi- ciency with light loads. An onboard overvoltage (OV) fault flag indicates when an OV fault has occurred. The OV flag can be set to latch the device off when an OV fault has occurred, or to automatically resume operation when the fault is removed. 2-Step Conversion “2-step” architectures use a primary regulator to convert the input power source (batteries or AC line voltage) to an intermediate supply voltage, often 5V. This intermediate voltage is then converted to the low voltage, high current supplies required by the system using a secondary regu- lator— the LTC1703. 2-step conversion eliminates the need for a single converter that converts a high input voltage to a very low output voltage, often an awkward design challenge. It also fits naturally into systems that continue to use the 5V supply to power portions of their circuitry, or have excess 5V capacity available as newer circuit designs shift the current load to lower voltage supplies. Each regulator in a typical 2-step system maintains a relatively low step-down ratio (5:1 or less), running at high efficiency while maintaining a reasonable duty cycle. In contrast, a regulator taking a single step from a high input voltage to a 1.xV output must run at a very narrow duty cycle, mandating trade-offs in external component values while compromising efficiency and transient response. The efficiency loss can exceed that of using a 2-step solution (see the 2-Step Efficiency Calculation section and Figure 10). Further complicating the calculation is the fact that many systems draw a significant fraction of their total power off the intermediate 5V supply, bypassing the low voltage supply. 2-step solutions using the LTC1703 usu- ally match or exceed the total system efficiency of single- step solutions, and provide the additional benefits of improved transient response, reduced PCB area and sim- plified power trace routing. 2-step regulation can buy advantages in thermal manage- ment as well. Power dissipation in the LTC1703 portion of a 2-step circuit is lower than it would be in a typical 1-step Table 1. VID Inputs and Corresponding Output Voltage for Channel 1 CODE VID4 VID3 VID2 VID1 VID0 VOUT1 00000 GND GND GND GND GND 2.00V 00001 GND GND GND GND Float 1.95V 00010 GND GND GND Float GND 1.90V 00011 GND GND GND Float Float 1.85V 00100 GND GND Float GND GND 1.80V 00101 GND GND Float GND Float 1.75V 00110 GND GND Float Float GND 1.70V 00111 GND GND Float Float Float 1.65V 01000 GND Float GND GND GND 1.60V 01001 GND Float GND GND Float 1.55V 01010 GND Float GND Float GND 1.50V 01011 GND Float GND Float Float 1.45V 01100 GND Float Float GND GND 1.40V 01101 GND Float Float GND Float 1.35V 01110 GND Float Float Float GND 1.30V 01111* GND Float Float Float Float 1.25V CODE VID4 VID3 VID2 VID1 VID0 VOUT1 10000 Float GND GND GND GND 1.275V 10001 Float GND GND GND Float 1.250V 10010 Float GND GND Float GND 1.225V 10011 Float GND GND Float Float 1.200V 10100 Float GND Float GND GND 1.175V 10101 Float GND Float GND Float 1.150V 10110 Float GND Float Float GND 1.125V 10111 Float GND Float Float Float 1.100V 11000 Float Float GND GND GND 1.075V 11001 Float Float GND GND Float 1.050V 11010 Float Float GND Float GND 1.025V 11011 Float Float GND Float Float 1.000V 11100 Float Float Float GND GND 0.975V 11101 Float Float Float GND Float 0.950V 11110 Float Float Float Float GND 0.925V 11111* Float Float Float Float Float 0.900V * 01111 and 11111 are defined by Intel to signify “no CPU.” The LTC1703 will generate the output voltages shown when these codes are selected. APPLICATIO S I FOR ATIO |
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