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National Semiconductor Electronic Components Datasheet

LM3075 Datasheet

Synchronous Current Mode Buck Controller

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September 2005
LM3075
High Efficiency, Synchronous Current Mode Buck
Controller
General Description
The LM3075 is a current mode control, synchronous buck
controller IC. Use of synchronous rectification and pulse-
skipping operation at light load achieves high efficiency over
a wide load range. Fixed frequency operation can be ob-
tained by disabling the pulse-skipping mode. Current mode
control assures excellent line and load regulation and a wide
loop bandwidth for fast response to load transients.
www.DataSChuereretn4Ut .mcoomde control can be achieved by either sensing
across the high side NFET or a sense resistor. The switching
frequency can be selected as either 200 kHz or 300 kHz
from an internal clock.
The LM3075 is available with an adjustable output in a
TSSOP-20 package.
Features
n Input voltage range of 4.5V-36V
n Current Mode Control
n Skip mode operation available
n Cycle by cycle current limit
n 1.24V ±2% Reference
Applications
n Automotive Power Supplies
n Distributed Power Systems
Typical Application Circuit
© 2005 National Semiconductor Corporation DS201623
20162301
www.national.com


National Semiconductor Electronic Components Datasheet

LM3075 Datasheet

Synchronous Current Mode Buck Controller

No Preview Available !

Connection Diagram
TOP VIEW
20162302
20-Lead TSSOP (MTC)
Ordering Information
Order Number
LM3075MTC
www.DataSheet4U.coLmM3075MTCX
Package Type
TSSOP-20
TSSOP-20
Pin Descriptions
LM3075 Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
VLIN5
VIN
EXT
FS
EN
FB
FPWM
COMP
SS
AGND
PGND
LDRV
VDD
CBOOT
HDRV
SW
CSL
CSH
ILIM
PGOOD
NSC Package Drawing
MTC-20
MTC-20
Supplied As
73 Units per Anti-Static Tube
2500 Units on Tape and Reel
Function
5V linear regulator output
Input voltage supply
External power connection for VLIN5
Frequency select
Enable pin
Feedback pin
Forced PWM selection
Compensation pin
Output enable / soft-start pin
Analog ground
Power ground
Low side gate drive
Low side gate drive supply
Bootstrap capacitor connection
High side gate drive
Switch node
Current sense low
Current sense high
Current limit threshold adjustment
Power good flag
www.national.com
2


Part Number LM3075
Description Synchronous Current Mode Buck Controller
Maker National Semiconductor
PDF Download

LM3075 Datasheet PDF






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