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Linear Technology Electronic Components Datasheet

LTC3556 Datasheet

USB Power Manager

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LTC3556 pdf
FEATURES
POWER MANAGER
n High Efficiency Switching PowerPathTM Controller
with Bat-TrackTM Adaptive Output Control
n Programmable USB or Wall Current Limit
www.DataSheet(41U0.c0omA/500mA/1A)
n Full Featured Li-Ion/Polymer Battery Charger
n Instant-On Operation with a Discharged Battery
n 1.5A Maximum Charge Current
n Internal 180mΩ Ideal Diode Plus External Ideal Diode
Controller Powers Load in Battery Mode
n Low No-Load IQ when Powered from BAT (<30μA)
DC/DCs
n Dual High Efficiency Buck DC/DCs (400mA/400mA IOUT)
n High Efficiency Buck-Boost DC/DC (1A IOUT)
n All Regulators Operate at 2.25MHz
n Dynamic Voltage Scaling on Two Buck Outputs
n I2C Control of Enables, Mode, Two VOUT Settings
n ENALL Pin with Power-Up Sequence Control
n Low No-Load Quiescent Current: 20μA Each
APPLICATIONS
n HDD-Based MP3 Players, PDAs, GPS, PMPs
n Other USB-Based Handheld Products
Electrical Specifications Subject to Change
LTC3556
High Efficiency USB Power
Manager with Dual Buck
and Buck-Boost DC/DCs
DESCRIPTION
The LTC®3556 is a highly integrated power management
and battery charger IC for Li-Ion/Polymer battery applica-
tions. It includes a high efficiency current limited switching
PowerPath manager with automatic load prioritization, a
battery charger, an ideal diode, and three synchronous
switching regulators (two bucks and one buck-boost).
Designed specifically for USB applications, the LTC3556’s
switching power manager automatically limits input cur-
rent to a maximum of either 100mA or 500mA for USB
applications or 1A for adapter-powered applications.
The LTC3556’s switching input stage transmits nearly all of
the 2.5W available from the USB port to the system load
with minimal power wasted as heat. This feature allows
the LTC3556 to provide more power to the application and
eases the constraint of thermal budgeting in small spaces.
The two buck regulators can provide up to 400mA each
and the buck-boost can deliver 1A.
The LTC3556 is available in the low profile 28-pin (4mm
× 5mm × 0.75mm) QFN surface mount package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. 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, Dual Buck, Buck-Boost and LDO
USB/WALL
4.5V TO 5.5V
CHARGE
ENALL
SEQ
3
I2C
USB COMPLIANT
STEP-DOWN
REGULATOR
CC/CV
BATTERY
CHARGER
0V
LTC3556
ALWAYS ON LDO
DUAL HIGH EFFICIENCY
BUCKS
HIGH EFFICIENCY
BUCK-BOOST
I2C PORT
1
2
3
TO OTHER
LOADS
OPTIONAL
+
T Li-Ion
3.3V/25mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
RTC/LOW
POWER LOGIC
MEMORY
CORE
μP
2.5V to 3.3V/1A
PGOODALL
HDD/IO
3556 TA01
Battery Charge Current
vs Battery Voltage
700 BATTERY CHARGE CURRENT
600 EXTRA CURRENT
FOR FASTER CHARGING
500
500mA USB CURRENT LIMIT
400
300
200
VBUS = 5V
100 5X MODE
BATTERY CHARGER PROGRAMMED FOR 1A
0
2.8 3 3.2 3.4 3.6 3.8 4 4.2
BATTERY VOLTAGE (V)
3556 TA01b
3556p
1


Linear Technology Electronic Components Datasheet

LTC3556 Datasheet

USB Power Manager

No Preview Available !

LTC3556 pdf
LTC3556
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VBUS (Transient) t < 1ms, Duty Cycle < 1% .. –0.3V to 7V
VIN1, VIN2, VIN3, VBUS (Static), DVCC,
FB1, FB2, NTC, BAT, ENALL, SCL, SDA,
PGOODALL, CHRG....................................... –0.3V to 6V
SEQ....................–0.3V to Lesser of 6V or (VOUT + 0.3V)
FB3, VC3.............. –0.3V to Lesser of 6V or (VIN3 + 0.3V)
ICLPROG ....................................................................3mA
IPGOODALL, ICHRG ....................................................50mA
www.DataShIePeRt4OUG.c..o.m.....................................................................2mA
ILDO3V3 ...................................................................30mA
ISW1, ISW2 ............................................................600mA
ISW, IBAT, IVOUT.............................................................2A
ISWAB3, ISWCD3, IVOUT3 .............................................2.5A
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°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
SW1 4
VIN1 5
FB1 6
19 SW2
29
18 VIN2
17 FB2
FB3 7
16 SDA
VC3 8
15 PGOODALL
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 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
LTC3556EUFD#PBF
LTC3556EUFD#TRPBF 3556
28-Lead (4mm × 5mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, VIN1 = VIN2 = VIN3 = VOUT3 = 3.8V, BAT = 3.8V, DVCC = 3.3V,
RPROG = 1k, RCLPROG = 3.01k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
PowerPath Switching Regulator
VBUS
IBUSLIM
Input Supply Voltage
Total Input Current
IVBUSQ
VBUS Quiescent Current
hCLPROG (Note 4) Ratio of Measured VBUS Current to
CLPROG Program 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
1x Mode
5x Mode
10x Mode
Suspend Mode
4.35 5.5 V
l 87
95 100
l 436
460 500
l 800
860 1000
l 0.31 0.38 0.50
mA
mA
mA
mA
7
15
15
0.044
mA
mA
mA
mA
224 mA/mA
1133 mA/mA
2140 mA/mA
11.3 mA/mA
3556p
2


Part Number LTC3556
Description USB Power Manager
Maker Linear Technology Corporation
Total Page 30 Pages
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