R6986 Datasheet, PDF (1/62 Pages) STMicroelectronics – 38 V, 2 A synchronous step-down switching regulator

R6986
38 V, 2 A synchronous step-down switching regulator with 30 μA
quiescent current
Datasheet - preliminary data
HTSSOP16 (R_TH = 40 °C/W)
– Extended product change notification
process
– Designed and manufactured to meet sub-
ppm quality goals
– Advanced mold and frame designs for
superior resilience in harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
Features
 General features
– 2 A DC output current
– 4 V to 38 V operating input voltage
– Large ambient temperature range:
-40 °C to 125 °C
– Low consumption mode or low noise mode
– 30 µA IQ at light load (LCM V_OUT = 3.3 V)
– 8 µA I_Q-SHTDWN
– Adjustable f_SW (250 kHz - 2 MHz)
– Output voltage adjustable from
0.85 V to V_IN
– Embedded output voltage supervisor
– Synchronization
– Adjustable soft-start time
– Internal current limiting
– Overvoltage protection
– Output voltage sequencing
– Peak current mode architecture
– R_{DSON HS} = 180 m, R_{DSON LS} = 150 m
– Thermal shutdown
 Aerospace and defense features
– Suitable for use in aerospace and defense
applications
– Dedicated traceability and part marking
– Production parts approval documents
available
– Adapted extended life time and
obsolescence management
Applications
 Designed for aerospace applications
 Battery powered applications
Description
The R6986 device is a step-down monolithic
switching regulator able to deliver up to 2 A DC.
The output voltage adjustability ranges from
0.85 V to V_IN. The 100% duty cycle, the wide
input voltage range and the large ambient
temperature range make it ideal for aerospace
and defense applications. The “Low Consumption
Mode” (LCM) is designed for always-on
applications, so it maximizes the efficiency at light
load with controlled output voltage ripple. The
“Low Noise Mode” (LNM) makes the switching
frequency constant and minimizes the output
voltage ripple overload current range. The output
voltage supervisor manages the reset phase for
any digital load (µC, FPGA.). The RST open
collector output can also 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 both power elements implements an
effective constant current protection.
May 2015
DocID026996 Rev 2
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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