LM2696 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – 3A, Constant On Time Buck Regulator

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 V_IN
range.
The LM2696 is capable of switching frequencies in the range
of 100 kHz to 500 kHz. Combined with an integrated 130 mΩ
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 mΩ internal MOSFET switch
Applications
n High efficiency step-down switching regulators
n LCD Monitors
n Set-Top Boxes
Typical Application Circuit
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