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LM2696 Datasheet

Constant On Time Buck Regulator

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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


National Semiconductor Electronic Components Datasheet

LM2696 Datasheet

Constant On Time Buck Regulator

No Preview Available !

Connection Diagram
Top View
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Pin Descriptions
Pin #
1, 2, 3
4
5
6
7
8
9
10
11
12
13
14, 15, 16
-
Name
SW
CBOOT
AVIN
EXTVCC
FB
N/C
GND
SS
PGOOD
RON
SD
PVIN
Exposed Pad
Ordering Information
Order
Number
LM2696MXA
LM2696MXAX
Package
Type
eTSSOP-16
eTSSOP-16
eTSSOP-16 Package
20153402
Function
Switching node
Bootstrap capacitor input
Analog voltage input
Output of internal regulator for decoupling
Feedback signal from output
No connect
Ground
Soft-start pin
Power-good flag, open drain output
Sets the switch on-time dependent on current
Shutdown pin
Power voltage input
Must be connected to ground
NSC Package
Drawing
MXA16A
MXA16A
Supplied As
92 units/rail
2,500 Units Tape and Reel
www.national.com
2


Part Number LM2696
Description Constant On Time Buck Regulator
Maker National Semiconductor
PDF Download

LM2696 Datasheet PDF






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