LTC3555/LTC3555-X
High Efficiency USB Power
Manager + Triple
Step-Down DC/DC
DESCRIPTION
FEATURES
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
withautomaticloadprioritization,abatterycharger,anideal
diode and three general purpose synchronous step-down
switching regulators.
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
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.
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 I
)
OUT
Two of the three general purpose switching regulators can
provide up to 400mA and the third can deliver 1A. The
n
n
n
n
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All Regulators Operate at 2.25MHz
Dynamic Voltage Scaling on Two Outputs
2
entire product can be controlled via I C or simple I/O. The
2
I C or Independent Enable, V
Controls
OUT
LTC3555-1/LTC3555-3 versions offer “instant-on” power
deliverytotheportableproductevenwithaverylowbattery
voltage.TheLTC3555-3versionalsohasareducedcharger
float voltage of 4.100V for battery safety and longevity.
Low No-Load Quiescent Current: 20µA
28-Pin (4mm × 5mm × 0.75mm) QFN Package
APPLICATIONS
The LTC3555 family 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.
n
HDD-Based MP3 Players, PDAs, GPS, PMPs
n
Portable Medical Products
n
Handheld Instrumentation
Other USB-Based Handheld Products
n
TYPICAL APPLICATION
High Efficiency PowerPath Manager and Triple Step-Down Regulator
Switching Regulator Efficiency to
USB/WALL
4.35V TO 5.5V
TO OTHER
LOADS
USB COMPLIANT
STEP-DOWN
REGULATOR
System Load (POUT/PBUS
)
100
90
80
70
60
50
40
30
20
10
CC/CV
BATTERY
CHARGER
0V
OPTIONAL
CURRENT
CONTROL
BAT = 4.2V
BAT = 3.3V
CHARGE
+
Li-Ion
T
LTC3555/LTC3555-X
3.3V/25mA
RTC/LOW
ALWAYS ON LDO
1
POWER LOGIC
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
MEMORY
I/O
TRIPLE
5
HIGH EFFICIENCY
STEP-DOWN
V
I
= 5V
ENABLE
CONTROLS
BUS
= 0mA
2
3
BAT
0.8V TO 3.6V/1A
SWITCHING
10x MODE
CORE
µPROCESSOR
0
REGULATORS
RST
0.01
0.1
(A)
1
2
I
2
2
OUT
I C
I C PORT
3555 TA01b
3555 TA01
3555fd
1
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