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LM2696 fiches techniques PDF

National Semiconductor - Constant On Time Buck Regulator

Numéro de référence LM2696
Description Constant On Time Buck Regulator
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM2696 fiche technique
October 2005
LM2696
3A, Constant On Time Buck Regulator
General Description
The LM2696 is a pulse width modulation (PWM) buck regu-
lator capable of delivering up to 3A into a load. The control
loop utilizes a constant on-time control scheme with input
voltage feed forward. This provides a topology that has
excellent transient response without the need for compen-
sation. The input voltage feed forward ensures that a con-
stant switching frequency is maintained across the entire VIN
range.
The LM2696 is capable of switching frequencies in the range
www.DataSohf e1e0t04kUH.czotmo 500 kHz. Combined with an integrated 130 m
high side NMOS switch the LM2696 can utilize small sized
external components and provide high efficiency. An internal
soft-start and power-good flag are also provided to allow for
simple sequencing between multiple regulators.
The LM2696 is available with an adjustable output in an
exposed pad TSSOP-16 package.
Features
n Input voltage range of 4.5V–24V
n Constant On-Time
n No compensation needed
n Maximum Load Current of 3A
n Switching frequency of 100 kHz–500 kHz
n Constant frequency across input range
n TTL compatible shutdown thresholds
n Low standby current of 12 µA
n 130 minternal MOSFET switch
Applications
n High efficiency step-down switching regulators
n LCD Monitors
n Set-Top Boxes
Typical Application Circuit
© 2005 National Semiconductor Corporation DS201534
20153401
www.national.com

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