Electronic Components Datasheet Search |
|
LTC3869-2 Datasheet(PDF) 10 Page - Linear Technology |
|
LTC3869-2 Datasheet(HTML) 10 Page - Linear Technology |
10 / 54 page LTC3838 10 3838fa PIN FUNCTIONS (QFN/TSSOP) PHASMD (Pin 4/Pin 8): Phase Selector Input. This pin determines the relative phases of channels and the CLKOUT signal. With zero phase being defined as the rising edge of TG1: Pulling this pin to SGND locks TG2 to 180°, and CLKOUT to 60°. Connecting this pin to INTVCC locks TG2 to 240° and CLKOUT to 120°. Floating this pin locks TG2 to 180° and CLKOUT to 90°. MODE/PLLIN (Pin 5/Pin 9): Operation Mode Selection or External Clock Synchronization Input. When this pin is tied to INTVCC, forced continuous mode operation is selected. Tying this pin to SGND allows discontinuous mode operation. When an external clock is applied at this pin, both channels operate in forced continuous mode and synchronize to the external clock. CLKOUT (Pin 6/Pin 10): Clock Output of Internal Clock Generator. Its output level swings between INTVCC and SGND. If clock input is present at the MODE/PLLIN pin, it will be synchronized to the input clock, with phase set by the PHASMD pin. If no clock is present at MODE/PLLIN, its frequency will be set by the RT pin. To synchronize other controllers, it can be connected to their MODE/PLLIN pins. SGND (Pin 7/Pin 11): Signal Ground. All small-signal analog and compensation components should be connected to this ground. Connect SGND to the exposed pad and PGND pin using a single PCB trace. RT (Pin 8/Pin 12): Clock Generator Frequency Program- ming Pin. Connect an external resistor from RT to SGND to program the switching frequency between 200kHz and 2MHz. An external clock applied to MODE/PLLIN should be within ±30% of this programmed frequency to ensure frequency lock. When the RT pin is floating, the frequency is internally set to be slightly under 200kHz. VRNG1, VRNG2 (Pins 9, 3/Pins 13, 7): Current Sense Volt- age Range Inputs. When programmed between 0.6V and 2V, the voltage applied to VRNG1,2 is twenty times (20×) the maximum sense voltage between SENSE1,2+ and SENSE1,2–, i.e., for either channel, (VSENSE+ – VSENSE–) = 0.05 • VRNG. If a VRNG is tied to SGND, the channel oper- ates with a maximum sense voltage of 30mV, equivalent to a VRNG of 0.6V; If tied to INTVCC, a maximum sense voltage of 50mV, equivalent to a VRNG of 1V. ITH1, ITH2 (Pins 10, 2/Pins 14, 6): Current Control Threshold. This pin is the output of the error amplifier and the switching regulator’s compensation point. The current comparator threshold increases with this control voltage. The voltage ranges from 0V to 2.4V, with 0.8V correspond- ing to zero sense voltage (zero inductor valley current). TRACK/SS1, TRACK/SS2 (Pins 11, 1/Pins 15, 5): External Tracking and Soft-Start Input. The LTC3838 regulates the feedback voltages (VOUTSENSE1+ – VOUTSENSE1–) and VFB2 to the smaller of 0.6V or the voltage on the TRACK/SS1,2 pins respectively. An internal 1μA temperature-independent pull-up current source is connected to each TRACK/SS pin. A capacitor to ground at this pin sets the ramp time to the final regulated output voltage. Alternatively, another voltage supply connected to this pin allows the output to track the other supply during start-up. VOUTSENSE1+ (Pin 12/Pin 16): Differential Output Sense Amplifier (+) Input of Channel 1. Connect this pin to a feedback resistor divider between the positive and negative output capacitor terminals of VOUT1. In nominal operation the LTC3838 will attempt to regulate the differential output voltage VOUT1 to 0.6V divided by the feedback resistor divider ratio. |
Similar Part No. - LTC3869-2 |
|
Similar Description - LTC3869-2 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |