LTC3566-2_15 Datasheet, PDF (1/28 Pages) Linear Technology – High Efficiency USB Power Manager Plus 1A Buck-Boost Converter

FEATURES
POWER MANAGER
■ _{High Efficiency Switching PowerPath™ Controller}
with Bat-Track™ Adaptive Output Control
■ _{Programmable USB or Wall Input Current Limit}
(100mA/500mA/1A)
■ _{Full Featured Li-Ion/Polymer Battery Charger}
■ _{Instant-On Operation with Discharged Battery}
■ _{1.5A Maximum Charge Current}
■ _{Internal 180mΩ Ideal Diode Plus External Ideal Diode}
Controller Powers Load in Battery Mode
■ _{Low No-Load IQ when Powered from BAT (<30μA)}
1A BUCK-BOOST DC/DC
■ _{High Efficiency (1A IOUT)}
■ _{2.25MHz Constant Frequency Operation}
■ _{Low No-Load Quiescent Current (~13μA)}
■ _{Zero Shutdown Current}
■ _{Pin Control of All Functions}
APPLICATIONS
■ _{HDD Based MP3 Players, PDA, GPS, PMP Products}
■ _{Other USB Based Handheld Products}
LTC3566/LTC3566-2
High Efficiency USB
Power Manager Plus 1A
Buck-Boost Converter
DESCRIPTION
The LTC^®3566 family are highly integrated power manage-
ment and battery charger ICs for Li-Ion/Polymer battery
applications. They include a high efficiency current lim-
ited switching PowerPath manager with automatic load
prioritization, a battery charger, an ideal diode, and a high
efficiency synchronous buck-boost switching regulator.
Designed specifically for USB applications, the LTC3566
family’s switching power manager automatically limits input
current to a maximum of either 100mA or 500mA for USB
applications or 1A for adapter-powered applications.
The LTC3566 family’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 LTC3566 family to provide more power to the
application and eases the constraint of thermal budgeting in
small spaces. The LTC3566-2 automatically reduces charge
current to maintain a regulated 3.6V V_OUT during low bat-
tery conditions; the LTC3566 does not. The synchronous
buck-boost DC/DC can provide up to 1A.
The LTC3566 family is available in a low profile 24-lead
4mm × 4mm 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, 6404251.
TYPICAL APPLICATION
FROM AC
ADAPTER
FROM USB
LTC3566/LTC3566-2 USB Power Manager with 3.3V/1A Buck-Boost
3.3μH
4.7μF
V_BUS
SW
CLPROG
100k
3.01k
PROG
0.1μF
2k
V_OUT
GATE
BAT
T 100k
DIGITAL CONTROL
NTC
CHRG
CHRGEN
LTC3566/LTC3566-2
LDO3V3
V_IN1
SWAB1
ILIM0
ILIM1
SWCD1
V_OUT1
MODE
EN1
GND
EXPOSED PAD
FB1
VC1
3566 TA01
V_OUT =
BAT + 300mV
10μF
TO OTHER
DC/DCs
OPTIONAL
+
Li-Ion
1μF
3.3V/25mA
ALWAYS
ON LDO
2.2μH
324k
1.3nF _105k
1μF
3.3V/1A
HDD
10μF
Switching Regulator Efficiency to
System Load (P_OUT/P_BUS)
100
90
80
70 ^{BAT = 4.2V}
60
BAT = 3.3V
50
40
30
20 _{VBUS = 5V}
10 ^IBAT ^{= 0mA}
10x MODE
0
0.01
0.1
I_OUT (A)
1
3566 TA01b
3566fb
1