L6730 datasheet(4/52 Pages) STMICROELECTRONICS

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Summary description

L6730 - L6730B

4/52

Summary description

The controller is an integrated circuit

... designed using BiCMOS-DMOS, v5 (BCD5) technology

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 converter topology.

The output voltage of the converter can be precisely regulated down to 600mV, with a

maximum tolerance of ±0.8%, or to 1.2V, when one of the internal references is used. It is also

possible to use an external reference from 0V to 2.5V.

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, depending on the number of the external MOSFETs

used. The PWM duty cycle can range from 0% to 100% with a minimum on-time (TON(MIN))

lower than 100ns, making conversions with a very low duty cycle and very high switching

frequency possible.

The device provides voltage-mode control. It includes a 400kHz free-running oscillator that is

adjustable from 100kHz to 1MHz. 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. A leading edge adjustable

blanking time is also available to avoid false over-current-protection (OCP) intervention in every

application condition.

It is possible to select the HICCUP mode or the constant current protection (L6730B) after the

soft-start phase.

During this phase constant current protection is provided. It is possible to select the sink-source

or the source-only mode capability

(before the device powers on) by acting on a multifunction

pin (L6730). The L6730 disables the sink mode capability during the soft-start in order to allow

a proper start-up also in pre-biased output voltage conditions. The L6730B can always sink

current and, so it can be used to supply the DDR Memory BUS termination. Other features

include Master-Slave synchronization (with 180° phase shift), Power-Good with adjustable

delay, over voltage-protection, feed back disconnection, selectable UVLO threshold (5V and

12V Bus), and thermal shutdown. The HTSSOP20 package allows the realization for very

compact DC/DC converters.

L6730 数据表(PDF) 4 Page - STMicroelectronics

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