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L6731B датащи(PDF) 3 Page - STMicroelectronics

номер детали L6731B
подробное описание детали  Adjustable step-down controller with synchronous rectification Dedicated to DDR Memory
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L6731B датащи(HTML) 3 Page - STMicroelectronics

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L6731B
Summary description
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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

производительномер деталидатащиподробное описание детали
logo
STMicroelectronics
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Аналогичное описание - L6731B

производительномер деталидатащиподробное описание детали
logo
STMicroelectronics
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