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L6984A Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte L6984A
Spiegazioni elettronici  36 V 400 mA synchronous step-down switching regulator
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Device description
L6984
10/34
DocID025378 Rev 3
3
Device description
The L6984 device is based on a “Constant On-Time” (COT) control scheme with frequency
feed-forward correction over the VIN range. As a consequence the device features fast load
transient response, almost constant switching frequency operation over the input voltage
range and simple stability control.
The switching frequency can be adjusted in the 250 kHz - 600 kHz range.
The LNM (low noise mode) implements constant PWM control to minimize the voltage ripple
over the load range, the LCM (low consumption mode) pulse skipping technique to increase
the efficiency at the light load.
No external resistor divider is required to regulate fixed 3.3 V output voltage, connecting FB
to the VCC pin and VBIAS to the regulated output voltage (see Figure 1 on page 1). An
external voltage divider implements the output voltage adjustability.
The switchover capability of the internal regulator derives a portion of the quiescent current
from an external voltage source (VBIAS pin is typically connected to the regulated output
voltage) to maximize the efficiency at the light load.
The device main internal blocks are shown in the block diagram in Figure 5:
The bandgap reference voltage
The on-time controller
A “Pulse Width Modulator” (PWM) comparator and the driving circuitry of the
embedded power elements
The SMPS controller block
The soft-start block to ramp the current limitation
The switchover capability of the internal regulator to supply a portion of the quiescent
current when the VBIAS pin is connected to an external output voltage
The current limitation circuit to implement the constant current protection, sensing
pulse-by-pulse low-side switch current.
A circuit to implement the thermal protection function
LNM pin strapping sets the LNM/LCM mode
The PG (“Power Good”) open collector output
The thermal protection circuitry.


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