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LMZ36002 데이터시트(PDF) 3 Page - Texas Instruments |
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LMZ36002 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 36 page " ! # 3 LMZ36002 www.ti.com SNVSA92A – SEPTEMBER 2015 – REVISED SEPTEMBER 2015 Product Folder Links: LMZ36002 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated (1) G = Ground, I = Input, O = Output 5 Pin Configuration and Functions RVQ Package 43-Pin QFN (Top View) Pin Functions PIN TYPE (1) DESCRIPTION NAME NO. AGND 1, 2, 3, 4, 5, 11, 12 G Zero volt reference for the analog control circuitry. All of these pins are not connected together internal to the device and must be connected to one another externally using an analog ground plane on the PCB. Pins 11 and 12 are internally connected to the PGND of the device at a single point. The analog ground plane of the PCB should allow only analog ground currents to flow through these pins. CLK 8 I Synchronization input to synchronize the device to an external clock. Connect this pin to AGND if not used. DNC 6, 40 - Do Not Connect. Do not connect these pins to AGND, to another DNC pin, or to any other voltage. These pins are connected to internal circuitry. Each pin must be soldered to an isolated pad. INH/UVLO 26 I Inhibit and UVLO adjust pin. Use an open drain or open collector device to control the inhibit function. A resistor divider between this pin, AGND, and PVIN adjusts the UVLO voltage. Connect this pin to PVIN if not used. PGND 19, 29, 30, 31, 32, 33, 41 G This is the return current path for the power stage of the device. Connect these pins to the input source, the load, and to the bypass capacitors associated with PVIN and VOUT using power ground planes on the PCB. Pad 41 should be connected to the ground planes using multiple vias for good thermal performance. PH 34, 35, 36, 37, 38, 39 O Phase switch node. Do not place any external components on these pins or tie them to a pin of another function. PVIN 27, 28, 42 I Power input voltage. These pins supply all of the power to the device. Connect these pins to the input source and connect external bypass capacitors between these pins and PGND close to the device. PWRGD 20 O Power Good flag pin. This open drain output asserts low if the output voltage is more than approximately ±10% out of regulation. This pin is internally connected to an uncommitted 100k pull- up resistor that can be pulled up to a user-defined voltage applied to the PWRGD_PU pin. PWRGD_P U 21 I An internal 100 k pull-up resistor is connected between this pin and the PWRGD pin. If use of this internal pull-up resistor is desired, connect this pin to an appropriate voltage source that is less than or equal to 12 V. If unused, leave this pin floating. RT 9 I This pin is connected to internal frequency setting circuitry which sets the default switching frequency to 500 kHz. An external resistor can be connected from this pin to AGND to adjust the switching frequency. Refer to application section in datasheet. |
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