LTC4001-1 データシートの表示（PDF） - Linear Technology

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LTC4001-1

2A Synchronous Buck Li-Ion Charger

Linear Technology 

LTC4001-1

APPLICATIONS INFORMATION

Layout Considerations

Switch rise and fall times are kept under 5ns for maximum

efficiency. To minimize radiation, the SW pin and input

bypass capacitor leads (between PVIN and PGND) should

be kept as short as possible. A ground plane should be

used under the switching circuitry to prevent interplane

coupling. The Exposed Pad must be connected to the

ground plane for proper power dissipation. The other paths

contain only DC and/or 1.5MHz tri-wave ripple current and

are less critical.

With the exception of the input and output filter ca-

pacitors (which should be connected to PGND) all other

components that return to ground should be connected

to GNDSENS.

Recommended Components Manufacturers

For a list of recommend component manufacturers, contact

the Linear Technology application department.

L1

1.5μH

VIN

4.5V TO 5.5V

C1

R1 R2 10μF

10k 1k D1

LED

SW

VINSENSE

PVIN

SENSE

BATSENS

BAT

PGND

CHRG

LTC4001-1

NTC

R3

10k

AT 25°C

TO μP

FROM μP

FAULT

EN

PROG IDET

TIMER SS GNDSENS

R4

549Ω

C2

0.22μF

R5

549Ω

C3

0.1μF

L1: VISHAY DALE IHLP-2525AH-01

R3: NTC VISHAY DALE NTHS0603N02N1002J

C4 +

10μF

2AHr

4.1V

Li-Ion

40011 F08

Figure 8. 2A Li-Ion Battery Charger with 3Hr Timer, Temperature

Qualification, Soft-Start, Remote Sensing and C/10 Indication

40011fa

18

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