LTC3586-3_15 Datasheet, PDF (1/36 Pages) Linear Technology – High Efficiency USB Power Manager with Boost, Buck-Boost and Dual Bucks

LTC3586-2/LTC3586-3
FEATURES
High Efficiency USB Power
Manager with Boost,
Buck-Boost and Dual Bucks
DESCRIPTION
Power Manager
n _{High Efficiency Switching PowerPath™ Controller}
with Bat-Track™ Adaptive Output Control and
Instant-On Operation
n _{Programmable USB or Wall Current Limit}
(100mA/500mA/1A)
n _{Full Featured Li-Ion/Polymer Battery Charger with}
Float Voltage of 4.2V (LTC3586-2) or 4.1V
(LTC3586-3) with 1.5A Maximum Charge Current
n _{Internal 180mΩ Ideal Diode Plus External Ideal Diode}
Controller Powers Load in Battery Mode
n _{<30µA No-Load Quiescent Current when Powered}
from BAT
DC/DCs
n _{Dual High Efficiency Buck DC/DCs (400mA IOUT)}
n _{High Efficiency Buck-Boost DC/DC (1A IOUT)}
n _{High Efficiency Boost DC/DC (800mA IOUT)}
n _{DC/DC FAULT Output}
n _{Compact (4mm × 6mm) 38-Pin QFN Package}
APPLICATIONS
n _{Portable Medical/Industrial Devices}
n _{Other USB-Based Handheld Products}
The LTC^®3586-2/LTC3586-3 are highly integrated power
management and battery charger ICs for Li-Ion/Polymer
battery applications. They include a high efficiency cur-
rent limited switching PowerPath manager with automatic
load prioritization, battery charger, ideal diode, and four
synchronous switching regulators (two bucks, one buck-
boost and one boost). Designed specifically for USB ap-
plications, the LTC3586-2/LTC3586-3’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.
Unlike linear chargers, the LTC3586-2/LTC3586-3 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 places. The two buck
regulators can provide up to 400mA each, the buck-boost
can deliver 1A, and the boost delivers at least 800mA.
The LTC3586-2/LTC3586-3 are available in a low profile
(0.75mm) 38-pin 4mm × 6mm QFN package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo 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, 6404251.
TYPICAL APPLICATION
High Efficiency PowerPath Manager, Dual Buck, Buck-Boost and Boost
USB/WALL
4.5V TO 5.5V
CHARGE
4
EN
MODE
2
I_LIM
USB COMPLIANT
STEP-DOWN
REGULATOR
CURRENT
CC/CV
BATTERY
0V
CONTROL
CHARGER
LTC3586-2/LTC3586-3
ALWAYS ON LDO
DUAL HIGH EFFICIENCY ¹
BUCKS
2
HIGH EFFICIENCY
BUCK-BOOST
3
HIGH EFFICIENCY
BOOST
4
TO OTHER
LOADS
OPTIONAL
+
T
Li-Ion
3.3V/20mA
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 I/O
SYSTEM
FAULT
5V/800mA
AUDIO/
MOTOR
358623 TA01
Battery Charge Current vs
Battery Voltage (LTC3586-2)
700
BATTERY CHARGE CURRENT
600
EXTRA CURRENT
500
FOR FASTER CHARGING
500mA USB CURRENT LIMIT
400
300
200
100
V_BUS = 5V
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)
358623 TA01b
358623f
1