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L6732 Scheda tecnica(PDF) 4 Page - STMicroelectronics

Il numero della parte L6732
Spiegazioni elettronici  Adjustable step-down controller with synchronous rectification
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Summary description
L6732
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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% 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%
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. 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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