LTC3586-2/LTC3586-3
High Efficiency USB Power
Manager with Boost,
Buck-Boost and Dual Bucks
DESCRIPTION
FEATURES
Power Manager
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-
rentlimitedswitchingPowerPathmanagerwithautomatic
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.
n
High Efficiency Switching PowerPath™ Controller
with Bat-Track™ Adaptive Output Control and
Instant-On Operation
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Programmable USB or Wall Current Limit
(100mA/500mA/1A)
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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
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Internal 180mΩ Ideal Diode Plus External Ideal Diode
Controller Powers Load in Battery Mode
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<30µA No-Load Quiescent Current when Powered
Unlikelinearchargers,theLTC3586-2/LTC3586-3switching
architecturetransmitsnearlyallofthepoweravailablefrom
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.
from BAT
DC/DCs
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Dual High Efficiency Buck DC/DCs (400mA I
)
OUT
)
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n
n
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High Efficiency Buck-Boost DC/DC (1A I
OUT
High Efficiency Boost DC/DC (800mA I
DC/DC FAULT Output
Compact (4mm × 6mm) 38-Pin QFN Package
)
OUT
The LTC3586-2/LTC3586-3 are available in a low profile
(0.75mm) 38-pin 4mm × 6mm QFN package.
APPLICATIONS
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.
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Portable Medical/Industrial Devices
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Other USB-Based Handheld Products
TYPICAL APPLICATION
High Efficiency PowerPath Manager, Dual Buck, Buck-Boost and Boost
Battery Charge Current vs
Battery Voltage (LTC3586-2)
USB/WALL
TO OTHER
LOADS
USB COMPLIANT
STEP-DOWN
4.5V TO 5.5V
REGULATOR
700
BATTERY CHARGE CURRENT
CC/CV
BATTERY
CHARGER
0V
OPTIONAL
Li-Ion
CURRENT
CONTROL
600
500
400
300
200
100
0
EXTRA CURRENT
FOR FASTER CHARGING
500mA USB CURRENT LIMIT
CHARGE
+
T
LTC3586-2/LTC3586-3
3.3V/20mA
RTC/LOW
ALWAYS ON LDO
POWER LOGIC
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
4
2
1
2
3
DUAL HIGH EFFICIENCY
MEMORY/
CORE µP
EN
MODE
BUCKS
V
= 5V
BUS
5x MODE
HIGH EFFICIENCY
BUCK-BOOST
BATTERY CHARGER PROGRAMMED FOR 1A
2.5V to 3.3V/1A
5V/800mA
I/O
SYSTEM
2.8
3.2 3.4 3.6
3.8
4
4.2
3
BATTERY VOLTAGE (V)
I
LIM
358623 TA01b
HIGH EFFICIENCY
BOOST
AUDIO/
MOTOR
4
FAULT
358623 TA01
358623f
1