LTC3555/LTC3555-X
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
VBUS (Transient) t < 1ms,
Duty Cycle < 1% .......................................... –0.3V to 7V
VIN1, VIN2, VIN3, VBUS (Static), DVCC,
FB1, FB2, FB3, NTC, BAT, SCL, SDA,
RST3, CHRG................................................. –0.3V to 6V
EN1, EN2, EN3................................ –0.3V to VOUT +0.3V
ILIM0, ILIM1 ................... –0.3V to MAX (VBUS, VOUT BAT)
ICLPROG ....................................................................3mA
IRST3, ICHRG............................................................50mA
IPROG ........................................................................2mA
ILDO3V3 ...................................................................30mA
ISW1, ISW2 ........................................................... 600mA
ISW, ISW3, IBAT, IVOUT ..................................................2A
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
LDO3V3 1
22 GATE
CLPROG 2
21 CHRG
NTC 3
20 PROG
FB2 4
VIN2 5
SW2 6
19 FB1
29
18 VIN1
17 SW1
EN2 7
16 EN1
DVCC 8
15 RST3
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC3555#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3555EUFD#PBF
LTC3555EUFD#TRPBF 3555
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
LTC3555IUFD#PBF
LTC3555IUFD#TRPBF 3555
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
LTC3555EUFD-1#PBF
LTC3555EUFD-1#TRPBF 35551
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
LTC3555IUFD-1#PBF
LTC3555IUFD-1#TRPBF 35551
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
LTC3555EUFD-3#PBF
LTC3555EUFD-3#TRPBF 35553
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
LTC3555IUFD-3#PBF
LTC3555IUFD-3#TRPBF 35553
28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, DVCC = 3.3V, RPROG = 1k, RCLPROG = 3k,
unless otherwise noted.
SYMBOL
PARAMETER
PowerPath Switching Regulator
CONDITIONS
MIN TYP
MAX UNITS
VBUS
IBUSLIM
IVBUSQ
Input Supply Voltage
Total Input Current
VBUS Quiescent Current
1x Mode, VOUT = BAT
5x Mode, VOUT = BAT
10x Mode, VOUT = BAT
Suspend Mode, VOUT = BAT
1x Mode, IOUT = 0mA
5x Mode, IOUT = 0mA
10x Mode, IOUT = 0mA
Suspend Mode, IOUT = 0mA
4.35
5.5
V
l 87
95
100
mA
l 436
460
500
mA
l 800
860
1000
mA
l 0.31 0.38
0.50
mA
7
mA
15
mA
15
mA
0.044
mA
3555fe
2
For more information www.linear.com/LTC3555
