LTC3554-3_15 Datasheet, PDF (2/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
Absolute Maximum Ratings
(Notes 1, 2, 3)
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
Pin Configuration
TOP VIEW
20 19 18 17 16
HPWR 1
15 NTC
FSEL 2
14 CHRG
PBSTAT 3
21
GND
13 SW1
PGOOD 4
12 BVIN
ON 5
11 SW2
6 7 8 9 10
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
T_JMAX = 110°C, θ_JA = 58.7°C/W
EXPOSED PAD (PIN 21) IS GND, AND MUST BE SOLDERED TO PCB GND
Order Information
LEAD FREE FINISH
LTC3554EUD#PBF
LTC3554EUD-1#PBF
LTC3554EUD-2#PBF
LTC3554EUD-3#PBF
LTC3554EPD#PBF
TAPE AND REEL
LTC3554EUD#TRPBF
LTC3554EUD-1#TRPBF
LTC3554EUD-2#TRPBF
LTC3554EUD-3#TRPBF
LTC3554EPD#TRPBF
PART MARKING
LDYS
LGFG
LFZX
LGHK
FDPT
PACKAGE DESCRIPTION
20-Lead (3mm × 3mm) Plastic QFN
20-Lead (3mm × 3mm) Plastic QFN
20-Lead (3mm × 3mm) Plastic QFN
20-Lead (3mm × 3mm) Plastic QFN
20-Lead (3mm × 3mm) Plastic UTQFN
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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C (OBSOLETE)
LTC3554 Options
FLOAT
PART NUMBER VOLTAGE
LTC3554
4.2V
LTC3554-1
4.1V
LTC3554-2
4.2V
LTC3554-3
4.2V
HARD
RESET TIME SEQUENCING
5 seconds Yes (Buck1 → Buck2)
5 seconds Yes (Buck1 → Buck2)
14 seconds Yes (Buck1 → Buck2)
14 seconds No (Buck1 and Buck2
Together)
2
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