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MC34713EP 数据表(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC34713EP 数据表(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 21 page Analog Integrated Circuit Device Data Freescale Semiconductor 9 34713 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION Advanced microprocessor-based systems require compact, efficient, and accurate point-of-load (PoL) power supplies. These PoL supply high current and fast transient response capability while maintaining regulation accuracy. Voltage monitoring (power sequencing) and increased operating frequency are also key features for PoL power supplies. PoL power supplies are non-isolated DC to DC converters that are physically located near their load (on the same printed circuit board) and take their input supply from an intermediate bus. Their close proximity to the load allows for higher efficiency, localized protection, and minimum distribution losses. Their compact design and low component-count also reduces overall system cost. The 34713 is a PoL single-output power supply that embodies an integrated solution that’s both highly cost- effective and reliable. It utilizes a voltage-mode synchronous buck switching converter topology with integrated low RDS(ON) (45 mΩ) N-channel power MOSFETs for high- efficiency operation. It provides an output voltage with an accuracy of less than ±2.0 %, capable of supplying up to 5.0 A of continuous current. Its power sequencing/tracking abilities makes it ideal for systems with multiple related supply rails. It has an adjustable switching frequency, thus permitting greater design flexibility and optimization over a wide range of operating conditions, and can operate at up to 1.0 MHz to significantly reduce the external components size and cost. It also features an over-current limit control, and protects against output overvoltage, undervoltage, and overtemperature conditions. It also protects the system from short circuit events and incorporates a power-good output signal to alert the host MCU should a fault occur. Operation can be enabled or disabled by controlling the SD pin, which offers power sequencing capabilities. By monolithically integrating the control and supervisory circuitry along with power-FETs, the 34713 offers a complete, compact, cost-effective, and simple solution to satisfy the PoL needs of today’s systems. FUNCTIONAL PIN DESCRIPTION REFERENCE VOLTAGE INPUT (VREFIN) The 34713 will track the voltage applied at this pin. FREQUENCY ADJUSTMENT INPUT (FREQ) The buck converter switching frequency can be adjusted by connecting this pin to an external resistor divider between VDDI and GND pins. The default switching frequency (FREQ pin connected to ground, GND) is set at 1.0 MHz. SOFT START ADJUSTMENT INPUT (ILIM) Soft start timing can be adjusted by applying an external voltage between 1.25 and VDDI on this pin. SIGNAL GROUND (GND) Analog ground of the IC. Internal analog signals are referenced to this pin voltage. INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI) This is the output of the internal bias voltage regulator. Connect a 1.0 µF, 6 V low ESR ceramic filter capacitor between this pin and the GND pin. Filtering any spikes on this output is essential to the internal circuitry stable operation. OUTPUT VOLTAGE DISCHARGE PATH (VOUT) Output voltage of the Buck Converter is connected to this pin. it only serves as the output discharge path once the SD signal is asserted. ERROR AMPLIFIER INVERTING INPUT (INV) Buck converter error amplifier inverting input. Connect the output voltage feedback network to this pin. COMPENSATION INPUT (COMP) Buck converter external compensation network connects to this pin. Use a type III compensation network. INPUT SUPPLY VOLTAGE (VIN) IC power supply input voltage. Input filtering is required for the device to operate properly. POWER GROUND (PGND) Buck converter and discharge MOSFET power ground. It is the source of the buck converter low-side power MOSFET. SWITCHING NODE (SW) Buck converter switching node. This pin is connected to the output inductor. POWER INPUT VOLTAGE (PVIN) Buck converter power input voltage. This is the drain of the buck converter high-side power MOSFET. BOOTSTRAP INPUT (BOOT) Bootstrap capacitor input pin. Connect a capacitor (as discussed on page 17) between this pin and the SW pin to enhance the gate of the high-side Power MOSFET during switching. |
类似零件编号 - MC34713EP |
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类似说明 - MC34713EP |
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