LTC4100 datasheet(9/48 Pages) LINER

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LTC1760

1760fa

Efficiency vs Charging Current

Load Dump

Load Regulation

TYPICAL PERFORMANCE CHARACTERISTICS

PowerPath Switching 1 and 2

SMBus Accelerator Operation

IOUT (A)

100

0.025

0.10

1760 G07

0.50

2.5

4.0

TIME (ms)

–4 –2

1760 G08

10 12 14 16

VIN = 20V

VDAC = 12.29V

IDAC = 3000mA

LOAD CURRENT = 1A

TA = 25°C

BAT1

OUTPUT

LOAD

CONNECTED

LOAD

DISCONNECTED

CHARGE CURRENT (mA)

4000

1760 G09

1000

2000

3000

12.4

12.3

12.2

12.1

12.0

11.9

11.8

11.7

11.6

VIN = 20V

VDAC = 12.288V

IDAC = 4000mA

TA = 25°C

TIME (μs)

1960 G10

–50 –40 –30

–10 0

10 20 30 40 50

–20

CLOAD = 20F

ILOAD = 0.8A

TA = 25°C

LOPWR

THRESHOLD

1μs/DIV

1760 G11

RPULLUP = 15k

LTC1760

VCC = 5V

CLD = 200pF

TA = 25°C

PIN FUNCTIONS

Input Power Related

SCN (Pin 4): PowerPath Current Sensing Negative Input.

This pin should be connected directly to the “bottom”

(output side) of the sense resistor, RSC, in series with the

three PowerPath switch pairs, for detecting short-circuit

current events. Also powers the LTC1760 internal circuitry

when all other sources are absent.

SCP (Pin 5): PowerPath Current Sensing Positive Input.

This pin should be connected directly to the “top” (switch

side) of the sense resistor, RSC, in series with the three

PowerPath switch pairs, for detecting short-circuit cur-

rent events.

GDCO (Pin 6): DCIN Output Switch Gate Drive. Together

with GDCI, this pin drives the gate of the P-channel switch

in series with the DCIN input switch.

GDCI (Pin 7): DCIN Input Switch Gate Drive. Together with

GDCO, this pin drives the gate of the P-channel switch

connected to the DCIN input.

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