LTC4098EUDC-3.6 查看數據表（PDF） - Linear Technology

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LTC4098EUDC-3.6

USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection

Linear Technology 

LTC4098-3.6

PIN FUNCTIONS

majority of the portable product should be powered from

VOUT . The LTC4098-3.6 will partition the available power

between the external load on VOUT and the internal battery

charger. Priority is given to the external load and any extra

power is used to charge the battery. An ideal diode from

BAT to VOUT ensures that VOUT is powered even if the load

exceeds the allotted power from VBUS or if the VBUS power

source is removed. VOUT should be bypassed with a low

impedance multilayer ceramic capacitor.

VBUS (Pin 13): Input Voltage for the Switching PowerPath

Controller. VBUS will usually be connected to the USB port

of a computer or a DC output wall adapter. VBUS should

be bypassed with a low impedance multilayer ceramic

capacitor.

SW (Pin 14): The SW pin delivers power from VBUS to

VOUT via the step-down switching regulator. An inductor

should be connected from SW to VOUT . See the Applica-

tions Information section for a discussion of inductance

value and current rating.

D0 (Pin 15): Mode Select Input Pin. D0, in combination

with the D1 pin and the D2 pin, controls the current limit

and battery charger functions of the LTC4098-3.6 (see

Table 1). This pin is pulled low by a weak current sink.

D1 (Pin 16): Mode Select Input Pin. D1, in combination

with the D0 pin and the D2 pin, controls the current limit

and battery charger functions of the LTC4098-3.6 (see

Table 1). This pin is pulled low by a weak current sink.

D2 (Pin 17): Mode Select Input Pin. D2, in combination

with the D0 pin and D1 pin, controls the current limit and

battery charger functions of the LTC4098-3.6 (see Table  1).

This pin is pulled low by a weak current sink.

WALL (Pin 18): External Power Source Sense Input. WALL

should be connected to the output of the external high

voltage switching regulator and to the drain of an exter-

nal P-channel MOSFET transistor. It is used to determine

when power is applied to the external regulator. When

power is detected, ACPR is driven low and the USB input

is automatically disabled.

ACPR (Pin 19): External Power Source Present Output

(Active Low). ACPR indicates that the output of the external

high voltage step-down switching regulator is suitable

for use by the LTC4098-3.6. It should be connected to

the gate of an external P-channel MOSFET transistor

whose source is connected to VOUT and whose drain is

connected to WALL. ACPR has a high level of VOUT and

a low level of GND.

VC (Pin 20): Bat-Track External Switching Regulator

Control Output. This pin drives the VC pin of a Linear

Technology external step-down switching regulator. In

concert with WALL and ACPR, it will regulate VOUT to

maximize battery charger efficiency.

409836f

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