LTC3555 Linear Technology, LTC3555 Datasheet - Page 2

• Manufacturer Part Number: LTC3555
• Description: High Efficiency USB Power Manager + Triple Step-Down DC/DC
• Manufacturer: Linear Technology

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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
LTC3555
(Notes 1, 2, 3)
V
Duty Cycle < 1% .......................................... –0.3V to 7V
V
FB1, FB2, FB3, NTC, BAT, EN1, EN2, EN3,
I
I
I
I
I
I
I
Junction Temperature ........................................... 125°C
Operating Temperature Range ................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
temperature range, otherwise specifi cations are at T
unless otherwise noted.
SYMBOL
PowerPath Switching Regulator
V
I
I
h
(Note 4)
I
2
LIM0
CLPROG
⎯ R ⎯ S ⎯ T ⎯ 3
PROG
LDO3V3
SW1
SW
BUSLIM
VBUSQ
OUT(POWERPATH)
CLPROG
BUS
BUS
IN1
, I
, V
, I
, I
, I
SW3
(Transient) t < 1ms,
........................................................................2mA
SW2
IN2
LIM1
⎯ C ⎯ H ⎯ R ⎯ G
...................................................................30mA
....................................................................3mA
, I
, V
............................................................600mA
, SCL, SDA, ⎯ R ⎯ S ⎯ T ⎯ 3 , ⎯ C ⎯ H ⎯ R ⎯ G ............ –0.3V to 6V
BAT
............................................................50mA
IN3
, I
, V
PARAMETER
Input Supply Voltage
Total Input Current
V
Ratio of Measured V
CLPROG Program Current
V
Loading BAT
VOUT
BUS
OUT
BUS
Quiescent Current
Current Available Before
...................................................2A
(Static), DV
BUS
CC
Current to
,
A
CONDITIONS
1x Mode, V
5x Mode, V
10x Mode, V
Suspend Mode, V
1x Mode, I
5x Mode, I
10x Mode, I
Suspend Mode, I
1x Mode
5x Mode
10x Mode
Suspend Mode
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
= 25°C. V
The
OUT
OUT
OUT
OUT
●
OUT
BUS
OUT
denotes the specifi cations which apply over the full operating
= 0mA
= 0mA
= BAT
= BAT
= 0mA
= 5V, BAT = 3.8V, DV
= BAT
OUT
OUT
PACKAGE/ORDER INFORMATION
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
= 0mA
= BAT
ORDER PART NUMBER
LTC3555EUFD
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
CLPROG
LDO3V3
DV
SW2
V
CC
NTC
EN2
FB2
IN2
28-LEAD (4mm × 5mm) PLASTIC QFN
CC
= 3.3V, R
http://www.linear.com/leadfree/
T
1
2
3
4
5
6
7
8
JMAX
28 27 26 25 24
9 10
= 125°C, θ
UFD PACKAGE
●
●
●
●
TOP VIEW
PROG
11 12 13
29
MIN
4.35
0.31
436
800
87
JA
= 1k, R
= 37°C/W
UFD PART MARKING
14
23
0.044
1133
2140
1251
0.38
11.3
0.32
TYP
460
860
224
135
672
22
21
20
19
18
17
16
15
95
15
15
CLPROG
7
GATE
CHRG
PROG
FB1
V
SW1
EN1
RST3
3555
IN1
= 3k,
MAX
1000
0.50
100
500
5.5
mA/mA
mA/mA
mA/mA
mA/mA
UNITS
3555f
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V