lm27342sdx National Semiconductor Corporation, lm27342sdx Datasheet - Page 2

• Manufacturer Part Number: lm27342sdx
• Description: 2 Mhz 1.5a/2a Wide Input Range Step-down Dc-dc Regulator With Frequency Synchronization
• Manufacturer: National Semiconductor Corporation

www.national.com
Order Number
LM27341MYX
LM27342MYX
LM27341SDX
LM27342SDX
Connection Diagrams
Ordering Information
Pin Descriptions
LM27341MY
LM27342MY
LM27341SD
LM27342SD
DAP
9,10
Pin
1,2
3
4
5
6
7
8
BOOST
Name
SYNC
AVIN
PVIN
GND
GND
eMSOP -10
eMSOP -10
eMSOP -10
eMSOP -10
LLP - 10
LLP - 10
LLP - 10
LLP - 10
SW
EN
FB
Package Type
10 - Lead LLP
Output switch. Connects to the inductor, catch diode, and bootstrap capacitor.
Boost voltage that drives the internal NMOS control switch. A bootstrap capacitor is connected between
the BOOST and SW pins.
Enable control input. Logic high enables operation. Do not allow this pin to float or be greater than V
+ 0.3V.
Frequency synchronization input. Drive this pin with an external clock or pulse train. Ground it to use
the internal clock.
Feedback pin. Connect FB to the external resistor divider to set output voltage.
Signal and Power Ground pin. Place the bottom resistor of the feedback network as close as possible
to this pin for accurate regulation.
Supply voltage for the control circuitry.
Supply voltage for output power stage. Connect a bypass capacitor to this pin.
Signal / Power Ground and thermal connection. Tie this directly to GND (pin 7). See Application
Information regarding optimum thermal layout.
Top View
NSC Package Drawing
MUC10A
MUC10A
MUC10A
MUC10A
SDA10A
SDA10A
SDA10A
SDA10A
30005604
2
Package Marking
Function
L231B
L231B
L231A
L231A
SSCB
SSCB
SSCA
SSCA
10 - Lead eMSOP
Top View
1000 Units on Tape and Reel
3500 Units on Tape and Reel
1000 Units on Tape and Reel
3500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
Transport Media
30005605
IN