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1 Summary description

L6732C

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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% and 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. The PWM duty cycle can range from 0% to 100%

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

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. During the soft-start, the sink mode

capability is disabled in order to allow a proper start-up also in pre-biased output voltage

conditions. After the soft-start the device can sink current. Other features are Power-Good,

Master/Slave synchronization (with 180° phase shift), over-voltage-protection, feed-back

disconnection and thermal shutdown. The HTSSOP16 package allows the realization of really

compact DC/DC converters.

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