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L6731B датащи(PDF) 3 Page - STMicroelectronics |
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L6731B датащи(HTML) 3 Page - STMicroelectronics |
3 / 24 page L6731B Summary description 3/24 1 Summary description The controller is an integrated circuit realized in BCD5 (BiCMOS-DMOS, version 5) fabrication that provides complete control logic and protection for high performance step-down DC-DC and niPOL converters. It is designed to drive N-Channel MOSFETs in a synchronous rectified buck topology. The output voltage of the converter can be precisely regulated down to 600mV with a maximum tolerance of ±0.8%. If an external reference is used, it will be trasferred divided by 2 to the N.I. input of the error-amplifier, in accordance to the DDR memory specifications. An internal resistor divider and a voltage buffer allow to achieve an accuracy of 1% on both Vtt and Vttref. It's possibile to provide an external reference from 0V to 2.5V in order to meet the specification for DDRI and DDRII. The input voltage can range from 1.8V to 14V, while the supply voltage can range from 4.5V to 14V. High peak current gate drivers provide for fast switching to the external power section, and the output current can be in excess of 20A. The PWM duty cycle can range from 0% to 100% with a minimum on-time (TON, MIN) lower than 100ns making possible conversions with very low duty cycle at high switching frequency. The device provides voltage-mode control that includes a selectable frequency oscillator (250KHz or 500KHz). The error amplifier features a 10MHz gain-bandwidth-product and 5V/µs slew-rate that permits to realize high converter bandwidth for fast transient response. The device monitors the current by using the RDS(on) of both the high-side and low-side MOSFET(s), eliminating the need for a current sensing resistor and guaranteeing an effective over-current-protection in all the application conditions. When necessary, two different current limit protections can be externally set through two external resistors. During the soft-start phase a constant current protection is provided while after the soft-start the device enters in hiccup mode in case of over-current. The converter can always sink current. Other features are Power-Good, not latched over-voltage-protection, feed- back disconnection and thermal shutdown. The HTSSOP16 package allows the realization of really compact DC/DC converters. |
Аналогичный номер детали - L6731B |
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Аналогичное описание - L6731B |
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