Datasheet
LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
2
3554123fd
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
BUS
, V
OUT
, BVIN
t < 1ms and Duty Cycle < 1% ................... –0.3V to 7V
Steady State ............................................ –0.3V to 6V
BAT, NTC, CHRG, SUSP, PBSTAT,
ON, PGOOD, FB1, FB2
.................................. –0.3V to 6V
PWR_ON1, PWR_ON2, STBY
HPWR, FSEL (Note 4)
......................–0.3V to V
CC
+ 0.3V
I
BAT
.............................................................................1A
I
SW1
, I
SW2
(Continuous) ...................................... 300mA
I
CHRG
, I
PGOOD,
I
PBSTAT
............................................75mA
Operating Junction Temperature Range
...–40°C to 85°C
Junction Temperature
............................................110°C
Storage Temperature Range
.................. –65°C to 125°C
(Notes 1, 2, 3)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3554EUD#PBF LTC3554EUD#TRPBF LDYS
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
LTC3554EUD-1#PBF LTC3554EUD-1#TRPBF LGFG
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
LTC3554EUD-2#PBF LTC3554EUD-2#TRPBF LFZX
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
LTC3554EUD-3#PBF LTC3554EUD-3#TRPBF LGHK
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
LTC3554EPD#PBF LTC3554EPD#TRPBF FDPT
20-Lead (3mm × 3mm) Plastic UTQFN
–40°C to 85°C (OBSOLETE)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
20 19 18 17 16
7 8
TOP VIEW
21
GND
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
9
10
HPWR
FSEL
PBSTAT
PGOOD
ON
NTC
CHRG
SW1
BVIN
SW2
V
BUS
SUSP
V
OUT
BAT
PROG
FB1
FB2
PWR_ON2
PWR_ON1
STBY
12
11
13
14
15
4
5
3
2
1
6
T
JMAX
= 110°C, θ
JA
= 70°C/W
EXPOSED PAD (PIN 21) IS GND, AND MUST BE SOLDERED TO PCB GND
LTC3554 Options
PART NUMBER
FLOAT
VOLTAGE
HARD
RESET TIME SEQUENCING
LTC3554 4.2V 5 seconds
Yes (Buck1 → Buck2)
LTC3554-1 4.1V 5 seconds
Yes (Buck1 → Buck2)
LTC3554-2 4.2V 14 seconds
Yes (Buck1 → Buck2)
LTC3554-3 4.2V 14 seconds No (Buck1 and Buck2
Together)