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Linear Technology Electronic Components Datasheet

LTC3555IUFD Datasheet

High Efficiency USB Power Manager + Triple Step-Down DC/DC

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FEATURES
Power Manager
n High Efficiency Switching PowerPath™ Controller
with Bat-Track™ Adaptive Output Control
n Programmable USB or Wall Current Limit
(100mA/500mA/1A)
n Full Featured Li-Ion/Polymer Battery Charger
n 1.5A Maximum Charge Current
n Internal 180mΩ Ideal Diode + External Ideal Diode
Controller Powers Load in Battery Mode
n Low No-Load Quiescent Current when Powered from
BAT (<32µA)
DC/DCs
n Triple High Efficiency Step-Down DC/DCs
(1A/400mA/400mA IOUT)
n All Regulators Operate at 2.25MHz
n Dynamic Voltage Scaling on Two Outputs
n I2C or Independent Enable, VOUT Controls
n Low No-Load Quiescent Current: 20µA
n 28-Pin (4mm × 5mm × 0.75mm) QFN Package
APPLICATIONS
n HDD-Based MP3 Players, PDAs, GPS, PMPs
n Portable Medical Products
n Handheld Instrumentation
n Other USB-Based Handheld Products
LTC3555/LTC3555-X
High Efficiency USB Power
Manager + Triple
Step-Down DC/DC
DESCRIPTION
The LTC®3555 family are highly integrated USB com-
patible power management and battery charger ICs for
Li-Ion/Polymer battery applications. They include a high
efficiency current limited switching PowerPath manager
with automatic load prioritization, a battery charger, an ideal
diode and three general purpose synchronous step-down
switching regulators.
The LTC3555 family limits input current to either 100mA
or 500mA for USB applications or 1A for adapter-powered
applications. Unlike linear chargers, the LTC3555 family’s
switching architecture transmits nearly all of the power
available from the USB port to the load with minimal loss
and heat which eases thermal constraints in small spaces.
Two of the three general purpose switching regulators can
provide up to 400mA and the third can deliver 1A. The
entire product can be controlled via I2C or simple I/O. The
LTC3555-1/LTC3555-3 versions offer “instant-on” power
delivery to the portable product even with a very low battery
voltage. The LTC3555-3 version also has a reduced charger
float voltage of 4.100V for battery safety and longevity.
The LTC3555 family is available in the low profile 28-pin
(4mm × 5mm × 0.75mm) QFN surface mount package.
L, LT, LTC, LTM Linear Technology, the Linear logo and Burst Mode are registered trademarks
and PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118 and 6404251.
TYPICAL APPLICATION
High Efficiency PowerPath Manager and Triple Step-Down Regulator
USB/WALL
4.35V TO 5.5V
CHARGE
ENABLE 5
CONTROLS
USB COMPLIANT
STEP-DOWN
REGULATOR
CURRENT
CONTROL
CC/CV
BATTERY
0V
CHARGER
LTC3555/LTC3555-X
ALWAYS ON LDO
TRIPLE
1
HIGH EFFICIENCY
STEP-DOWN
2
SWITCHING
REGULATORS
3
I2C PORT
TO OTHER
LOADS
OPTIONAL
+
T
Li-Ion
3.3V/25mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/1A
RST
2
RTC/LOW
POWER LOGIC
MEMORY
I/O
CORE
µPROCESSOR
I2C
3555 TA01
For more information www.linear.com/LTC3555
Switching Regulator Efficiency to
System Load (POUT/PBUS)
100
90
80
70 BAT = 4.2V
60
BAT = 3.3V
50
40
30
20
10
0
0.01
VBUS = 5V
IBAT = 0mA
10x MODE
0.1
IOUT (A)
1
3555 TA01b
3555fe
1


Linear Technology Electronic Components Datasheet

LTC3555IUFD Datasheet

High Efficiency USB Power Manager + Triple Step-Down DC/DC

No Preview Available !

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


Part Number LTC3555IUFD
Description High Efficiency USB Power Manager + Triple Step-Down DC/DC
Maker Linear
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LTC3555IUFD Datasheet PDF






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