FEATURES
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 I
OUT
)
n
High Efficiency Buck-Boost DC/DC (1A I
OUT
)
n
High Efficiency Boost DC/DC (800mA I
OUT
)
n
DC/DC
FAULT
Output
n
Compact (4mm
×
6mm) 38-Pin QFN Package
LTC3586-2/LTC3586-3
High Efficiency USB Power
Manager with Boost,
Buck-Boost and Dual Bucks
DESCRIPTION
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.
APPLICATIONS
n
n
Portable Medical/Industrial Devices
Other USB-Based Handheld Products
TYPICAL APPLICATION
High Efficiency PowerPath Manager, Dual Buck, Buck-Boost and Boost
USB/WALL
4.5V TO 5.5V
USB COMPLIANT
STEP-DOWN
REGULATOR
CURRENT
CONTROL
CHARGE
LTC3586-2/LTC3586-3
ALWAYS ON LDO
EN
MODE
I
LIM
2
HIGH EFFICIENCY
BOOST
4
FAULT
5V/800mA
4
DUAL HIGH EFFICIENCY
BUCKS
HIGH EFFICIENCY
BUCK-BOOST
1
2
3
T
CC/CV
BATTERY
CHARGER
0V
OPTIONAL
CHARGE CURRENT (mA)
TO OTHER
LOADS
Battery Charge Current vs
Battery Voltage (LTC3586-2)
700
600
500
400
300
200
100
0
V
BUS
= 5V
5x MODE
BATTERY CHARGER PROGRAMMED FOR 1A
2.8
3
3.2 3.4 3.6
3.8
BATTERY VOLTAGE (V)
4
4.2
BATTERY CHARGE CURRENT
EXTRA CURRENT
FOR FASTER CHARGING
500mA USB CURRENT LIMIT
+
Li-Ion
3.3V/20mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
2.5V to 3.3V/1A
MEMORY/
CORE µP
I/O
SYSTEM
AUDIO/
MOTOR
358623 TA01
RTC/LOW
POWER LOGIC
358623 TA01b
358623f
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
