LTC3567 Datasheet, PDF (1/28 Pages) Linear Technology – High Effi ciency USB Power Manager Plus 1A Buck-Boost Converter with I2C Control

LTC3567
FEATURES
High Efficiency USB Power
Manager Plus 1A Buck-Boost
Converter with I²C Control
DESCRIPTION
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 _{“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)}
1A Buck-Boost DC/DC
n _{High Efficiency (1A IOUT)}
n _{2.25MHz Constant Frequency Operation}
n _{Low No-Load Quiescent Current (~13μA)}
n _{Zero Shutdown Current}
n _I²_{C Control of All Functions}
The LTC^®3567 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 a high efficiency
synchronous buck-boost switching regulator. Designed
specifically for USB applications, the LTC3567’s switch-
ing power manager automatically limits input current to
a maximum of either 100mA or 500mA for USB or 1A for
adapter-powered applications.
The LTC3567’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 LTC3567 to provide more power to the application and
eases thermal budgeting constraints in small spaces.
The synchronous buck-boost DC/DC can provide up to
1A output current.
APPLICATIONS
n _{HDD Based MP3 Players, PDA, GPS, PMP Products}
n _{Other USB Based Handheld Products}
The LTC3567 is available in a low profile 24-pin (4mm ×
4mm × 0.75mm) QFN surface mount package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
and Bat-Track are a 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
FROM AC
ADAPTER
FROM USB
LTC3567 USB Power Manager with a 3.3V/1A Buck-Boost
3.3μH
4.7μF
100k
V_BUS
CLPROG
3.01k
PROG
0.1μF 2k
T 100k
DIGITAL
CONTROL
I²C SERIAL
INTERFACE
NTC
CHRG
CHRGEN
EN1
SCL
SDA
DV_CC
SW
LTC3567
V_OUT
GATE
BAT
LDO3V3
V_IN1
SWAB1
SWCD1
V_OUT1
FB1
V_C1
3567 TA01
10μF
V_OUT =
BAT + 300mV
OTHER DC/DCs
OPTIONAL
+
Li-Ion
1μF
3.3V/20mA
ALWAYS
ON LDO
2.2μH
324k
1.5nF _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
10
0
0.01
V_BUS = 5V
I_BAT = 0mA
10x MODE
0.1
I_OUT (A)
1
3567 TA01b
3567f
1