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LM3670 Datasheet(Fiches technique) 12 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce LM3670
Description  Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
Télécharger  17 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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 12 page
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Operation Description (Continued)
Soft-Start
The LM3670 will have a soft-start circuit that limits in-rush
current during start-up. Typical currents and times are:
Current (mA)
Duration (µSec)
032
70
224
140
256
280
256
620
until soft start ends
Note 4: The first 32µS are to allow the bias currents to stabilize
LDO - Low Drop Out Operation
The LM3670 can operate at 100% duty cycle (no switching,
PMOS switch completely on) for low drop out support of the
output voltage. In this way the output voltage will be con-
trolled down to the lowest possible input voltage.
The minimum input voltage needed to support the output
voltage is
I
LOAD
Load current
R
DSON,
PFET
Drain to source resistance of PFET switch
in the triode region
R
INDUCTOR Inductor resistance
20075803
FIGURE 5. Operation in PFM Mode and Transfer to PWM Mode
www.national.com
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