ZHCSG01C February 2017 – August 2018 DRV8320 , DRV8320R , DRV8323 , DRV8323R
PRODUCTION DATA.
The DRV8320R and DRV8323R have an integrated buck regulator (LMR16006) to supply power for an external controller or system voltage rail. The LMR16006 device is a 60-V, 600-mA, buck (step-down) regulator.
The buck regulator has a very-low quiescent current during light loads to prolong battery life. The LMR16006 device improves performance during line and load transients by implementing a constant-frequency current-mode control scheme which requires less output capacitance and simplifies frequency compensation design. The LMR16006 is the LMR16006X device version that uses a 0.7-MHz switching frequency.
The LMR16006 device decreases the external component count by integrating the bootstrap recharge diode. The bias voltage for the integrated high-side MOSFET is supplied by a capacitor on the CB to SW pin. The bootstrap capacitor voltage is monitored by a UVLO circuit and turns off the high-side MOSFET when the boot voltage falls lower than a preset threshold.
The LMR16006 device can operate at high duty cycles because of the boot UVLO and then refreshes the wimp MOSFET. The output voltage can be stepped down to as low as the 0.8-V reference. The internal soft-start feature minimizes inrush currents.
For additional details, a block diagram showing the wimp MOSFET, and design information refer to the LMR16006 SIMPLE SWITCHER® 60 V 0.6 A Buck Regulators With High Efficiency Eco-mode data sheet.