LTC4360ISC8-2TRMPBF datasheet(8/12 Pages) LINER

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LTC4360-1/LTC4360-2

436012f

APPLICATIONS INFORMATION

MOSFET Conﬁgurations and Selection

The LTC4360 can be used with various external MOSFET

conﬁgurations (see Figure 3). The simplest conﬁguration is

a single N-channel MOSFET. It has the lowest RDS(ON) and

voltage drop and is thus the most power efﬁcient solution.

When GATE is pulled to ground, the MOSFET can isolate

OUT from a positive voltage at IN up to the BVDSS of the

MOSFET. However, reverse current can still ﬂow from OUT

to IN via the parasitic body diode of the MOSFET.

For near zero reverse leakage current protection when GATE

is pulled to ground, back-to-back N-channel MOSFETs can

beused.AddinganadditionalP-channelMOSFETcontrolled

by GATEP (LTC4360-2) provides negative input voltage

protection down to the BVDSS of the P-channel MOSFET.

Another conﬁguration consists of a P-channel MOSFET

controlled by GATEP and a N-channel MOSFET controlled

by GATE. This provides protection against overvoltage and

negative voltage but not reverse current.

Input Transients

Figure 4 shows a typical setup when an AC wall adaptor

charges a mobile device. The inductor LIN represents the

lumped equivalent inductance of the cable and the EMI ﬁlter

found in some wall adaptors. RIN is the lumped equivalent

resistance of the cable, adaptor output capacitor ESR and

the connector contact resistance.

LIN and RIN form an LC tank circuit with any capacitance

at IN. If the wall adaptor is powered up ﬁrst, plugging the

wall adaptor output to IN does the equivalent of applying

Figure 4. 20V Hot-Plug into a 10μF Capacitor

LOAD

436012 F04a

MOBILE

DEVICE

WALL ADAPTOR

AC/DC

COUT

LIN

RIN

CABLE

ICABLE

VIN

10V/DIV

ICABLE

20A/DIV

5μs/DIV

436012 F04b

RIN = 150mΩ, LIN = 0.7μH

LOAD = 10Ω, COUT = 10μF

Figure 3. MOSFET Conﬁgurations

GATEP

SUPPLY

OVERVOLTAGE, REVERSE

CURRENT PROTECTION

NEGATIVE

VOLTAGE

PROTECTION

GATE

OVERVOLTAGE, REVERSE

CURRENT PROTECTION

GATE

GATEP

436012 F03

OVERVOLTAGE

PROTECTION

OVERVOLTAGE

PROTECTION

NEGATIVE

VOLTAGE

PROTECTION

GATE

OUT

SUPPLY

OUT

SUPPLY

OUT

SUPPLY

OUT

a voltage step to this LC circuit. The resultant voltage

overshoot at IN can rise to twice the DC output voltage

of the wall adaptor as shown in Figure 4. Figure 5 shows

the 20V adaptor output applied to the LTC4360. Due to

the low capacitance at the IN pin, the plug-in transient has

been brought down to a manageable level.

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