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LM3370 Datasheet(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM3370
Descripción Electrónicos  Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
PDF  23 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3370 Datasheet(HTML) 14 Page - National Semiconductor (TI)

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Operation Description (Continued)
FORCED PWM MODE
The LM3370 auto mode can be bypassed by forcing the
device to operate in PWM mode, this can be implemented
through the I
2C compatible interface; see Output Table on
page 19.
SOFT-START
The LM3370 has a soft start circuit that limits in-rush current
during start up. Soft start is activated only if EN goes from
logic low to logic high after V
IN reaches 2.7V.
LDO - LOW DROP OUT OPERATION
The LM3370 can operate at 100% duty cycle (no switching,
PFET 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 mini-
mum input voltage needed to support the output voltage is
V
IN,MIN =ILOAD*(RDSON,PFET +RINDUCTOR)+VOUT
• I
LOAD
load current
• R
DSON/PFET drain to source resistance of PFET switch in
the triode region
• R
INDUCTOR
inductor resistance
20167303
FIGURE 5. Operation in PFM Mode and Transfer to PWM Mode
www.national.com
14



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