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LM3670MFX-1.8 Datasheet(PDF) 11 Page - Texas Instruments

Part # LM3670MFX-1.8
Description  Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3670MFX-1.8 Datasheet(HTML) 11 Page - Texas Instruments

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-VOUT
L
VIN-VOUT
L
11
LM3670
www.ti.com
SNVS250F – NOVEMBER 2004 – REVISED FEBRUARY 2016
Product Folder Links: LM3670
Submit Documentation Feedback
Copyright © 2004–2016, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Circuit Operation
The LM3670 operates as follows. During the first portion of each switching cycle, the control block in the LM3670
turns on the internal PFET switch. This allows current to flow from the input through the inductor to the output
filter capacitor and load. The inductor limits the current to a ramp with a slope of:
(1)
by storing energy in a magnetic field. During the second portion of each cycle, the controller turns the PFET
switch off, blocking current flow from the input, and then turns the NFET synchronous rectifier on. The inductor
draws current from ground through the NFET to the output filter capacitor and load, which ramps the inductor
current down with a slope of:
(2)
The output filter stores charge when the inductor current is high, and releases it when low, smoothing the voltage
across the load.
7.3.2 Soft Start
The LM3670 has a soft-start circuit that limits in-rush current during start-up. Typical start-up times with a 10-µF
output capacitor and 350-mA load is 400 µs:
Table 1. Typical Start-Up Times for Soft Start
INRUSH CURRENT (mA)
DURATION (µs)
0
32
70
224
140
256
280
256
620
until soft start ends
7.3.3 LDO - Low Dropout Operation
The LM3670 can operate at 100% duty cycle (no switching, PMOS switch is completely on) for low dropout
support of the output voltage. In this way the output voltage is controlled down to the lowest possible input
voltage.
The minimum input voltage needed to support the output voltage is
VIN_MIN = ILOAD × (RDSON,PFET + RINDUCTOR) + VOUT
where
ILOAD = load current
RDSON, PFET = the drain to source resistance of PFET switch in the triode region
RINDUCTOR = the inductor resistance
(3)


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