A6984 Datasheet, PDF (1/47 Pages) STMicroelectronics – Synchronous rectification

A6984
36 V, 400 mA automotive synchronous step-down
switching regulator
Datasheet - production data
Applications
 Car body and ADAS applications (LCM)
 Car audio and low noise applications (LNM)
VFDFPN10 4 x 4 x 1.0 mm
Features
 AEC-Q100 qualified
 400 mA DC output current
 4.5 V to 36 V operating input voltage
 Synchronous rectification
 Low consumption mode or low noise mode
 100 µA I_Q at light load (LCM V_OUT = 3.3 V)
 13 µA I_Q-SHTDWN
 Adjustable f_SW (250 kHz - 600 kHz)
 Output voltage adjustable from 0.9 V
 No resistor divider required for 3.3 V V_OUT
 V_BIAS maximizes efficiency at light load
 350 mA valley current limit
 Constant on-time control scheme
 PGOOD open collector
 Thermal shutdown
Description
The A6984 is a step-down monolithic switching
regulator able to deliver up to 400 mA DC. The
output voltage adjustability ranges from 0.9 V. The
fixed 3.3 V VOUT requires no external resistor
divider. The “low consumption mode” (LCM) is
designed for applications active during car
parking, so it maximizes the efficiency at light load
with controlled output voltage ripple. The “low
noise mode” (LNM) makes the switching
frequency almost constant over the load current
range, serving low noise application
specifications such as car audio/sensors. The
PGOOD open collector output can implement
output voltage sequencing during the power-up
phase. The synchronous rectification, designed
for high efficiency at medium-heavy load, and the
high switching frequency capability make the size
of the application compact. Pulse-by-pulse
current sensing on the low-side power element
implements effective constant current protection.
The package lead finishing guarantees side
solderability, thus allowing visual inspection
during manufacturing.
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March 2017
This is information on a product in full production.
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