Electronic Components Datasheet Search |
|
LTC3892-1 Datasheet(PDF) 10 Page - Linear Technology |
|
LTC3892-1 Datasheet(HTML) 10 Page - Linear Technology |
10 / 36 page LTC3892/LTC3892-1 10 38921f For more information www.linear.com/LTC3892 pin FuncTions (LTC3892 (QFN)/LTC3892-1 (TSSOP)) FREQ (Pin 1/ Pin 5): The frequency control pin for the internal VCO. Connecting this pin to GND forces the VCO to a fixed low frequency of 350kHz. Connecting this pin to INTVCC forces the VCO to a fixed high frequency of 535kHz.Otherfrequenciesbetween50kHzand900kHzcan be programmed using a resistor between FREQ and GND. The resistor and an internal 20µA source current create a voltage used by the internal oscillator to set the frequency. PLLIN/MODE (Pin 2/Pin 6): External Synchronization Input to Phase Detector and Forced Continuous Mode Input. When an external clock is applied to this pin, the phase-locked loop will force the rising TG1 signal to be synchronized with the rising edge of the external clock, and the regulators will operate in forced continuous mode. When not synchronizing to an external clock, this input, which acts on both controllers, determines how the LTC3892/LTC3892-1 operates at light loads. Pulling this pin to ground selects Burst Mode operation. An internal 100kresistortogroundalsoinvokesBurstModeoperation when the pin is floated. Tying this pin to INTVCC forces continuous inductor current operation. Tying this pin to a voltage greater than 1.1V and less than INTVCC – 1.3V selects pulse-skipping operation. This can be done by connecting a 100k resistor from this pin to INTVCC. PGOOD1, PGOOD2 (Pins 3, 4/NA): Open-Drain Logic Output. PGOOD1,2 is pulled to ground when the voltage on the respective VFB1,2 pin is not within ±10% of its set point. These pins are only available on the LTC3892, not the LTC3892-1. INTVCC (Pin 5/Pin 7): Output of the Internal 5V Low Drop- out Regulator. The low voltage analog and digital circuits are powered from this voltage source. A low ESR 0.1µF ceramic bypass capacitor should be connected between INTVCC and GND, as close as possible to the IC. RUN1, RUN2 (Pins 6, 7/Pins 8, 9): Run Control Inputs for Each Controller. Forcing any of these pins below 1.2V shuts down that controller. Forcing all of these pins below 0.7VshutsdowntheentireLTC3892/LTC3892-1,reducing quiescent current to approximately 3.6µA. ILIM(Pin8/NA):CurrentComparatorSenseVoltageRange Input. Tying this pin to GND or INTVCC or floating it sets the maximum current sense threshold (for both channels) to one of three different levels (50mV, 100mV, or 75mV respectively). This pin is only available on the LTC3892, not the LTC3892-1. For the LTC3892-1, the maximum current sense threshold is 75mV. VFB2(Pin11/Pin12):Thispinreceivestheremotelysensed feedback voltage for channel 2 from an external resistor divider across the output. DRVUV (Pin13/Pin 14): Determines the higher or lower DRVCC UVLO and EXTVCC switchover thresholds, as listed on the Electrical Characteristics table. Connecting DRVUV toGNDchoosesthelowerthresholdswhereastyingDRVUV to INTVCC chooses the higher thresholds. DRVSET (Pin 14/Pin 15): Sets the regulated output volt- age of the DRVCC LDO regulator. Connecting this pin to GND sets DRVCC to 6V whereas connecting it to INTVCC sets DRVCC to 10V. Voltages between 5V and 10V can be programmed by placing a resistor (50k to 100k) between the DRVSET pin and GND. DRVCC (Pin 20/Pin 21): Output of the Internal or External Low Dropout (LDO) Regulator. The gate drivers are pow- ered from this voltage source. The DRVCC voltage is set by the DRVSET pin. Must be decoupled to ground with a minimum of 4.7µF ceramic or other low ESR capacitor. Do not use the DRVCC pin for any other purpose. EXTVCC(Pin21/Pin22):ExternalPowerInputtoanInternal LDOConnectedtoDRVCC.ThisLDOsuppliesDRVCCpower, bypassing the internal LDO powered from VIN whenever EXTVCC is higher than its switchover threshold (4.7V or 7.7V depending on the DRVSET pin). See EXTVCC Con- nection in the Applications Information section. Do not float or exceed 14V on this pin. Do not connect EXTVCC to a voltage greater than VIN. Connect to GND if not used. VIN (Pin 22/Pin 23): Main Supply Pin. A bypass capacitor should be tied between this pin and the GND pin. |
Similar Part No. - LTC3892-1_15 |
|
Similar Description - LTC3892-1_15 |
|
|
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 |