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LM2731XMF_NOPB Datasheet(PDF) 15 Page - Texas Instruments

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Part No. LM2731XMF_NOPB
Description  LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LM2731XMF_NOPB Datasheet(HTML) 15 Page - Texas Instruments

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TI Confidential - NDA Restrictions
LM2731
www.ti.com
SNVS217F – MAY 2004 – REVISED NOVEMBER 2012
DESIGN PARAMETERS VSW AND ISW
The value of the FET "ON" voltage (referred to as VSW in the equations) is dependent on load current. A good
approximation can be obtained by multiplying the "ON Resistance" of the FET times the average inductor
current.
FET on resistance increases at VIN values below 5V, since the internal N-FET has less gate voltage in this input
voltage range (see Typical Performance Characteristics curves). Above VIN = 5V, the FET gate voltage is
internally clamped to 5V.
The maximum peak switch current the device can deliver is dependent on duty cycle. For higher duty cycles, see
Typical Performance Characteristics curves.
THERMAL CONSIDERATIONS
At higher duty cycles, the increased ON time of the FET means the maximum output current will be determined
by power dissipation within the LM2731 FET switch. The switch power dissipation from ON-state conduction is
calculated by:
P(SW) = DC x IIND(AVE)
2 x R
DS(ON)
(11)
There will be some switching losses as well, so some derating needs to be applied when calculating IC power
dissipation.
INDUCTOR SUPPLIERS
Recommended suppliers of inductors for this product include, but are not limited to Sumida, Coilcraft, Panasonic,
TDK and Murata. When selecting an inductor, make certain that the continuous current rating is high enough to
avoid saturation at peak currents. A suitable core type must be used to minimize core (switching) losses, and
wire power losses must be considered when selecting the current rating.
SHUTDOWN PIN OPERATION
The device is turned off by pulling the shutdown pin low. If this function is not going to be used, the pin should be
tied directly to VIN. If the SHDN function will be needed, a pull-up resistor must be used to VIN (approximately
50k-100k
Ω recommended). The SHDN pin must not be left unterminated.
Copyright © 2004–2012, Texas Instruments Incorporated
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