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L6984ATR Scheda tecnica(PDF) 4 Page - STMicroelectronics

Il numero della parte L6984ATR
Spiegazioni elettronici  36 V 400 mA synchronous step-down switching regulator
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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Pin settings
L6984
4/34
DocID025378 Rev 3
1
Pin settings
1.1
Pin connection
Figure 2. Pin connection (top view)
1.2
Pin description
Table 1. Pin description
No.
Pin
Description
1
PGOOD
The open collector output is driven low when the FB voltage is below the VPGD L threshold
(see Table 5).
2
FB
Inverting input of the error amplifier
3
TON
A resistor connected between this pin and VIN sets the switching frequency.
4EN
Enable pin. A logical active high signal enables the device. Connect this pin to VIN if not
used.
5
GND
Power GND
6
LX
Switching node
7
VIN
DC input voltage
8VCC
Embedded regulator output that supplies the main switching controller.
Connect an external 1
F capacitor for proper operation.
An integrated LDO regulates VCC = 3.3 V if VBIAS voltage is < 2.4 V.
VCC is connected to VBIAS through a MOSFET switch if VBIAS > 3.2 V and the embedded
LDO is disabled to increase the light load efficiency.
9
VBIAS
Typically connected to the regulated output voltage. An external voltage reference can be
used to supply the analog circuitry to increase the efficiency at light load. Connect to GND if
not used.
10
LNM
Connect to VCC for low noise mode (LNM) / to GND for low consumption mode (LCM)
operation.


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