1

dc1674aafb

DEMO MANUAL DC1674A-A

DESCRIPTION

LTC4155EUFD

Dual Input Power Manager/3.5A Li-Ion Battery

Demonstration Circuit 1674A-A is dual input power

USB On-The-Go (OTG).

The dual input multiplexer, overvoltage protection (OVP)

and reverse voltage protection (RVP) is implemented with

external N-channel MOSFETs.

from the active input voltage. This voltage is regulated to

minimize the dissipation in the battery charger. The mini-

instant-on function when the battery is fully discharged.

L

, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks

and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

Most functions on the LTC®4155EUFD are controlled via

Please refer to the LTC4155EUFD data sheet for details

and the electrical and timing specifications.

The LTC4155EUFD does modify several of its own control

registers to reflect the current operating conditions.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1674A-A

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

WALL Input Voltage Range

4.35

5

5.5

V

Input Current from WALL Input

0

0.1

3

A

USB Input Voltage Range

4.35

5

5.5

V

Input Current from USB Input

0

0.1

3

A

3.4

4

4.6

V

Total Load Current Including Battery Charger

4.5

A

Voltage on the BAT Pin

2.7

3.6

4.2

V

BAT Pin Source or Sink Current

–4

3

A

Input Voltage Range, Non-Operating

5.75

27

V

CLPROG1

CLPROG2

IRQ

GND

2

3.6k

100k

ID

USBGT

CHGSNS

USBSNS

1.21k

499

47nF

10µF

0.1µF

22µF

NTC

BATSNS

BATGATE

NTCBIAS

WALLGT

LTC4155

WALLSNS

SW

TO

SYSTEM

LOAD

1µH

dc1674aa TA01a

LOAD CURRENT (A)

0

0

10

30

40

50

100

70

1.0

2.0

2.5

dc1674aa TA01b

20

80

90

60

0.5

1.5

3.0

3.5

Switching Regulator Efficiency