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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MC34700EP 데이터시트(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC34700EP 데이터시트(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 31 page  Analog Integrated Circuit Device Data Freescale Semiconductor 11 34700 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION When products and technologies are first introduced, the power needs are generally met with individual regulators. These regulators can be changed or adjusted to match the ever changing requirements. As products and technologies mature, the requirements become more defined, and the individual regulators can be replaced with a multiple output power IC. The integrated solution is cost effective, and offers size reduction and reliable operation. The 34700 is a high efficiency, four output, integrated power regulator. It includes three switching buck regulators and an LDO. The first buck regulator, DC/DC1, uses a non- synchronous, voltage mode topology and can operate over a wide external supply voltage range of 9V to 18V. It is capable of delivering 1.5A of continuous current. The other buck regulators, DC/DC 2 and DC/DC3, use a synchronous rectifier, voltage mode topology, and operate from an external supply voltage range of 1.5V to 6V. They are each capable of delivering 1.25A of continuous current. The LDO has a separate input that can be connected to any of the buck regulators’ outputs, or to an external supply, depending on the application. The LDO is capable of delivering 400mA of continuous current. The 34700 includes control, supervisory, and protection features. It has individual enables for each regulator. This allows the power up and power down sequencing to be controlled by the user. The 34700 monitors each of the regulators’ output voltage for an over-voltage or under- voltage condition. If any of the outputs are out of regulation, either too high or too low, the “power good” status signal will go low. The 34700 includes cycle by cycle current limiting and short-circuit protection, as well as thermal shutdown protection. By integrating the control, supervisory and protection features along with the four regulators into a single 5 x 5mm QFN package, all of the functions that four individual regulators can perform are now available in the 34700. FUNCTIONAL PIN DESCRIPTION INPUT SUPPLY VOLTAGE (VIN) IC supply voltage input. This pin should be de-coupled from the VIN1 supply voltage. Filtering is required for proper device operation. POWER INPUT VOLTAGE (VIN1, VIN2, VIN3, LDO_VIN) Buck regulators and LDO power input voltage. VIN1, 2, 3 is connected to the drain of the respective DC/DC’s high side MOSFET. LDO_VIN is connected to the drain of the linear regulator’s pass device. Local bypass capacitors are recommended. SWITCH NODE (SW1, SW2, SW3) Buck regulator’s switching node. SW1 is connected to the source of the high side MOSFET. Connect this pin to the cathode of the catch diode and the output inductor. SW2 and SW3 are connected to source of the high side and the drain of the low side MOSFET. Connect this pin to the output inductor. BOOTSTRAP INPUT (BST1, BST2, BST3) Bootstrap capacitor input. Connect a capacitor between the BST and SW pin of the respective DC/DC to enhance the gate of the high side MOSFET during switching. ERROR AMPLIFIER INVERTING INPUT (FB1, FB2, FB3, LDO_FB) Buck regulator and LDO error amplifier inverting input. Connect the output voltage feedback resistor divider to this pin. COMPENSATION INPUT (COMP1, COMP2, COMP3) Buck regulators compensation input. COMP is connected to the error amplifier’s output of the respective DC/DC regulator. Connect the external compensation components between the COMP pin and the FB pin of the respective buck regulator. POWER GROUND (GND2, GND3) Buck regulator power ground. GND is connected to the source of the low side MOSFET of the respective DC/DC regulator. Connect this pin to the DC/DC regulator’s power return path. ANALOG GROUND (AGND) Analog ground of the IC. Internal analog and logic signals are referenced to this pin. REGULATOR ENABLE (EN1, EN2, EN3, EN_LDO) These inputs enable the buck regulators and the LDO. Asserting EN turns on the respective regulator. Control logic remains active as long as VIN is present. |
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