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L6983 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce L6983
Description  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983 Fiches technique(HTML) 4 Page - STMicroelectronics

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2
Pin configuration
Figure 2. Pin connection (top through view)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
E.P.
VIN
VINLDO
AGND
EN/CLKIN
VCC
AGND
BOOT
VIN
Table 1. Pin description
Pin
Symbol
Function
1
VIN
DC input voltage.
2
VINLDO
DC input voltage connected to the supply rail with a simple RC filter.
3
AGND
Analog ground.
4
EN / CLKIN
Enable pin with internal voltage divider. Pull-down/up to disable/
enable the device.
In LNM versions, this pin is also used to provide an external clock
signal, which synchronizes the device.
5
PGOOD
The PGOOD open collector output is driven to low impedance when
the output voltage is out of regulation and released once the output
voltage becomes valid.
6
VBIAS
Typically connected to the regulated output voltage, an external
voltage source can be used to supply part of the analog circuitry to
reduce current consumptions at light load. Connect it to AGND if not
used.
7
FB/VOUT
This pin operates as VOUT or FB according to the selected part
number. In fixed output voltage versions, VOUT is the output voltage
sensing with selected internal voltage divider.
In adjustable versions, FB is output voltage sensing with eternal
voltage divider.
8
FSW
Connect an external resistor to program the oscillator frequency and
enable the optional dithering.
9
VCC
This pin supplies the embedded analog circuitry. Connect a ceramic
capacitor (≥ 1 µF) to filter internal voltage reference.
10
AGND
Analog ground.
11
BOOT
Connect an external capacitor (100 nF typ.) between BOOT and SW
pins. The gate charge required to drive the internal NMOS is
refreshed during the low-side switch conduction time.
L6983
Pin configuration
DS13116 - Rev 1
page 4/63



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