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LM27212SQ Folha de dados(PDF) 3 Page - National Semiconductor (TI) |
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LM27212SQ Folha de dados(HTML) 3 Page - National Semiconductor (TI) |
3 / 23 page Pin Descriptions (TSSOP) Pin 1, VID0: First and least significant bit to program the output voltage, as specified in VID Code table. Pin 2, VID1: 2nd bit to program the output voltage, as specified in VID Code table. Pin 3, VID2: 3rd bit to program the output voltage, as speci- fied in VID Code table. Pin 4, NC: No connect. Pin 5, VID3: 4th bit to program the output voltage, as speci- fied in VID Code table. Pin 6, NC: No connect. Pin 7, VID4: 5th bit to program the output voltage, as speci- fied in VID Code table. Pin 8, VID5: 6th and most significant bit to program the output voltage, as specified in VID Code table. Pin 9, STP_CPU#: When this pin is logic low, VREF voltage is equal to that on the VSTP pin. This pin offers the power supply designer a way to dynamically (meaning when the regulator is running) lower the output voltage by a preset percentage of the VREF value. Pin 10, SLP: When this pin is logic high, VREF voltage is equal to that on the SLP pin. The pin offers the power supply designer a way to dynamically (meaning when the regulator is running) change the output voltage to a preset fixed value. Pin 11, VRON: Chip enable input. When this pin goes high, soft start begins. When this pin goes low, soft shutdown begins. Pin 12, VREF: Desired regulator output voltage under no load. Pin 13, VSLP: Desired Sleep mode output voltage. Connect this pin to the desired reference level. See the typical appli- cation circuit. Also refer to the Pin 10 definition. Pin 14, VSTP: Desired Stop CPU mode output voltage. Connect this pin to the desired reference level. See the typical application circuit. Also refer to the Pin 9 definition. Pin 15, VBOOT: Initial output voltage desired after soft start completes. Connect this pin to the desired reference level. This pin offers the power supply designer a way to start into a different voltage than the final desired value. The output voltage will start slewing (in a controlled manner) to the value defined by the VID pins about 25µs after output voltage reaches VBOOT. See Timing Diagram. Pin 16, SGND: Signal ground. Pin 17, VDAC: Buffered Digital-to-Analog converter output. Pins 18 P_Z1: Reference adjust, do not connect. Pin 19, NC: No connect. Pins 20 P_Z0: Reference adjust, do not connect. Pin 21, NC: No connect. Pin 22, TGND: Reserved for test purpose. Must be con- nected to signal ground. Pin 23, V1R7: 1.7V reference voltage. Pin 24, SS: Soft start, soft shutdown and slew rate control. Connect a capacitor between this pin and ground to control the soft start and soft shutdown speed. The value of the capacitor will also define the slew rate of the output voltage swings. There is an internal current source charging or dis- charging the capacitor at this pin. The current for soft start and soft shutdown is typically 22µA and 45µA respectively, and the current for dynamic output voltage swing (whether it is a Dynamic VID change or it is a change to or from Stop CPU or Sleep Mode) is typically 335µA. Pin 25, PGOOD: Power good flag. Open-drain when output voltage enters the power good window and XPOK is as- serted. Masked during dynamic output voltage transitions. See Timing Diagram for further details. Pin 26, XPOK: Power good control. Only when this pin is a logic high can PGOOD pin be pulled high. Connect this pin to the power good flag of another regulator if the latter needs to be powered up first. Pin 27, SENSE: Regulator output voltage sense. Connect directly to output. Pin 28, NC: No connect. Pin 29, CLK_EN#: An output signal provided as a conve- nience to enable an external logic circuit if needed. It is asserted typically 18µs after both XPOK is high and the output voltage is within power good window. Pin 30, NC: No connect. Pin 31, VOVP: Over-voltage protection level. Connect this pin to the desired reference voltage to set the trigger level for over-voltage protection. Pins 32, CMPREF: Inductor current reference. Voltage be- tween this pin and the regulator output determines the in- ductor current. Pin 33, CMP2: Current sense for Channel 2. Voltage be- tween this pin and the regulator output is compared with the voltage between inductor current reference (Pin 32) and the regulator output to control the inductor current. Pin 34, CMP1: Current sense for Channel 1. Voltage be- tween this pin and the regulator output is compared with the voltage between inductor current reference (Pin 32) and the regulator output to control the inductor current. Pin 35, SYNC2: Connect to the LEN pin of the LM27222 driver to enable or disable the turning on of the bottom power FET. Pin 36, OUT2: Channel 2 pulse output to control the switch- ing of the external MOSFET driver such as the LM27222. Pin 37, DGND: Digital ground. Pin 38, VDD: Chip power supply. Pin 39, OUT1: Channel 1 pulse output to control the switch- ing of the external MOSFET driver such as the LM27222. Pin 40, SYNC1: Connect to the LEN pin of the LM27222 driver to enable or disable the turning on of the low-side power FET. Pin 41, ILIMREF: Current limit reference. Voltage between this pin and the regulator output sets the inductor current limit level. Pin 42, ILIM2: Current limit sense for Channel 2. Voltage between this pin and the regulator output is the voltage across the current sense resistor. Pin 43, NC: No connect. Pin 44, ILIM1: Current limit sense for Channel 1. Voltage between this pin and the regulator output is the voltage across the current sense resistor. Pin 45, NC: No connect. Pin 46, SRCK1: Kelvin connect to Channel 1 bottom FET source node (ground) to detect negative inductor current. Pin 47, SW1: Connect to Channel 1 switch node (drain of low-side power FET) to detect negative inductor current. Pin 48, DE_EN#: Diode emulator mode trigger signal. When the IC is in Sleep mode, if this pin is logic low, the regulator will shut down Channel 2 and force Channel 1 to run in diode emulation mode (bottom FET is turned off when inductor current goes negative). www.national.com 3 |
Nº de peça semelhante - LM27212SQ |
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Descrição semelhante - LM27212SQ |
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