LTC3555 Datasheet, PDF (2/32 Pages) Linear Technology – High Effi ciency USB Power Manager + Triple Step-Down DC/DC

LTC3555/LTC3555-X
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
V_BUS (Transient) t < 1ms,
Duty Cycle < 1% .......................................... –0.3V to 7V
V_IN1, V_IN2, V_IN3, V_BUS (Static), DV_CC,
FB1, FB2, FB3, NTC, BAT, EN1, EN2, EN3,
I_LIM0, I_LIM1, SCL, SDA, RST3, CHRG............ –0.3V to 6V
I_CLPROG ....................................................................3mA
I_RST3, I_CHRG............................................................50mA
I_PROG ........................................................................2mA
I_LDO3V3 ...................................................................30mA
I_SW1, I_SW2 ............................................................600mA
I_SW, I_SW3, I_BAT, I_VOUT ...................................................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
CLPROG 2
22 GATE
21 CHRG
NTC 3
20 PROG
FB2 4
V_IN2 5
SW2 6
19 FB1
29
18 V_IN1
17 SW1
EN2 7
DV_CC 8
9
16 EN1
15 RST3
10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
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.
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_BUS = 5V, BAT = 3.8V, DV_CC = 3.3V, R_PROG = 1k, R_CLPROG = 3k,
unless otherwise noted.
SYMBOL
PARAMETER
PowerPath Switching Regulator
V_BUS
I_BUSLIM
Input Supply Voltage
Total Input Current
I_VBUSQ
V_BUS Quiescent Current
CONDITIONS
1x Mode, V_OUT = BAT
5x Mode, V_OUT = BAT
10x Mode, V_OUT = BAT
Suspend Mode, V_OUT = BAT
1x Mode, I_OUT = 0mA
5x Mode, I_OUT = 0mA
10x Mode, I_OUT = 0mA
Suspend Mode, I_OUT = 0mA
MIN TYP
MAX UNITS
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
3555fd
2