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XRP7740 Datasheet(PDF) 7 Page - Exar Corporation |
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XRP7740 Datasheet(HTML) 7 Page - Exar Corporation |
7 / 31 page XRP7740 REV 1.1.0 Quad-Output Digital PWM Buck Controller PIN DESCRIPTION QFN PIN # PIN NAME DESCRIPTION 39 VIN1 Power source for the internal linear regulators to generate VCCA, VDD and the Standby LDO (LDOOUT). Place a decoupling capacitor close to the controller IC. Also used in UVLO1 fault generation – if VIN1 falls below the user programmed limit, all channels are shut down. The VIN1 pin needs to be tied to VIN2 on the board with a short trace. 38 VIN2 If the Vin2 pin voltage falls below the user programmed UVLO VIN2 level all channels are shut down. The VIN2 pin needs to be tied to VIN1 on the board with a short trace. 37 VCCA Output of the internal 5V LDO. This voltage is internally used to power analog blocks. Note that a compensation capacitor should be used on this pin [see Application Note]. 26 VCCD Gate Drive input voltage. This is not an output voltage. This pin can be connected to VCCA to provide power for the Gate Drive. VCCD should be connected to VCCA with the shortest possible trace and decouple with a minimum 1uF capacitor. Alternatively, VCCD could be connected to an external supply (not greater than 5V). 36,31, 16,21 PGND1- PGND4 Power Ground. Ground connection for the low side gate driver. 1 AVDD Output of the internal 1.8V LDO. A decoupling capacitor should be placed between AVDD and AGND close to the chip (with short traces). 2 DVDD Input for powering the internal digital logic. This pin should be connected to AVDD. 10 DGND Digital Ground. This pin should be connected to the ground plane at the exposed pad with a separate trace. 11 AGND Analog Ground. This pin should be connected to the ground plane at the exposed pad with a separate trace. 17,22, 30,55 GL1-GL4 Output pin of the low side gate driver. Connect directly to the respective gate of an external N-channel MOSFET. 19,24, 28,33 GH1-GH4 Output pin of the high side gate driver. Connect directly to the respective gate of an external N-channel MOSFET. 34,29, 23,18 LX1-LX4 Lower supply rail for the high-side gate driver (GHx). Connect this pin to the switching node at the junction between the two external power MOSFETs and the inductor. These pins are also used to measure voltage drop across bottom MOSFETs in order to provide output current information to the control engine. 32,27, 20,25 BST1-BST4 High side driver supply pin(s). Connect BST to an external boost diode and a capacitor as shown in the front page diagram. The high side driver is connected between the BST pin and LX pin. EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. EXAR CONFIDENTIAL, PRELIMINARY & PROPRIETARY. DO NOT DISTRIBUTE OR COPY. 7 |
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