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LM27341 Datasheet(PDF) 2 Page - Texas Instruments

Part # LM27341
Description  2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
PDF  42 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM27341 Datasheet(HTML) 2 Page - Texas Instruments

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2
3
4
7
9
8
PVIN
SW
EN
DAP
AVIN
GND
BOOST
6
10
1
5
SYNC
FB
SW
PVIN
1
2
3
4
SW
BOOST
GND
AVIN
PVIN
PVIN
5
FB
EN
SYNC
SW
6
7
8
9
10
DAP
LM27341/2
VIN
PVIN
EN
BOOST
SW
FB
GND / DAP
VOUT
C2
L1
C1
C3
R1
R2
D1
SYNC
AVIN
CLK
ON
OFF
LM27341, LM27342, LM27341Q, LM27342Q
SNVS497D – NOVEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
Typical Application Circuit
Figure 1.
Figure 2. Efficiency vs Load Current
VOUT = 5V, fsw = 2 MHz
Connection Diagram
Figure 3. 10-Lead SON (Top View)
Figure 4. 10-Lead MSOP-PowerPad (Top View)
See DSC0010A Package
See DGQ0010A Package
PIN DESCRIPTIONS
Pin
Name
Function
1, 2
SW
Output switch. Connects to the inductor, catch diode, and bootstrap capacitor.
3
BOOST
Boost voltage that drives the internal NMOS control switch. A bootstrap capacitor is connected between the
BOOST and SW pins.
4
EN
Enable control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3V.
5
SYNC
Frequency synchronization input. Drive this pin with an external clock or pulse train. Ground it to use the
internal clock.
6
FB
Feedback pin. Connect FB to the external resistor divider to set output voltage.
7
GND
Signal and Power Ground pin. Place the bottom resistor of the feedback network as close as possible to this
pin for accurate regulation.
8
AVIN
Supply voltage for the control circuitry.
9, 10
PVIN
Supply voltage for output power stage. Connect a bypass capacitor to this pin.
DAP
GND
Signal / Power Ground and thermal connection. Tie this directly to GND (pin 7). See Application Information
regarding optimum thermal layout.
2
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Copyright © 2008–2010, Texas Instruments Incorporated
Product Folder Links: LM27341 LM27342 LM27341Q LM27342Q



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