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LM26 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM26
Spiegazioni elettronici  Two-Phase Synchronous Step-Down Switching Controller
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM26 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions (Continued)
SW2 (Pin 16): Switch-node connection for Channel 2, which
is connected to the source of the top MOSFET of Channel 2.
It serves as the negative supply rail for the top-side gate
driver, HDRV2.
HDRV2 (Pin 17): Top-side gate-drive output for Channel 2.
HDRV is a floating drive output that rides on the correspond-
ing switching-node voltage.
CBOOT2 (Pin 18): Bootstrap capacitor connection. It serves
as the positive supply rail for the Channel 2 top-side gate
drive. Connect this pin to VDD2 (Pin 19) through a diode,
and connect the low side of the bootstrap capacitor to SW2
(Pin16).
VDD2 (Pin 19): The supply rail for the Channel 2 low-side
gate drive. Connected to VLIN5 (Pin 7) through a 4.7
resistor and bypassed to power ground with a ceramic ca-
pacitor of at least 1µF. Tie this pin to VDD1 (Pin 24).
LDRV2 (Pin 20): Low-side gate-drive output for Channel 2.
PGND (Pin 21): The power ground connection for both
channels. Connect to the ground rail of the system.
VIN (Pin 22): The power input pin for the chip. Connect to
the positive (+) input rail of the system. This pin must be
connected to the same voltage rail as the top FET drain (or
the current sense resistor when used).
LDRV1 (Pin 23): Low-side gate-drive output for Channel 1.
VDD1 (Pin 24): The supply rail for Channel 1 low-side gate
drive. Tie this pin to VDD2 (Pin 19).
CBOOT1 (Pin 25): : Bootstrap capacitor connection. It
serves as the positive supply rail for Channel 1 top-side gate
drive. See CBOOT2 (Pin 18).
HDRV1 (Pin 26): Top-side gate-drive output for Channel 1.
See HDRV2 (Pin 17).
SW1 (Pin 27): Switch-node connection for Channel 1. See
SW2 (Pin16).
RSNS1 (Pin 28): The negative (-) Kelvin sense for the
internal current sense amplifier of Channel 1. See RSNS2
(Pin 15).
www.national.com
3


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