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LTC3554-2_15

Description
Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
File Size512KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3554-2_15 Overview

Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
Micropower USB Power
Manager with Li-Ion Charger
and Two Step-Down Regulators
DescripTion
The LTC
®
3554 family* are micropower, highly integrated
power management and battery charger ICs for single-cell
Li-Ion/Polymer battery applications. They include a
PowerPath™ manager with automatic load prioritization,
a battery charger, an ideal diode and numerous internal
protection features. Designed specifically for USB applica-
tions, the LTC3554 power managers automatically limit
input current to a maximum of either 100mA or 500mA.
Battery charge current is automatically reduced such that
the sum of the load current and the charge current does
not exceed the selected input current limit.
The LTC3554 also includes two synchronous step-down
switching regulators as well as a pushbutton controller.
With all supplies enabled in standby mode, the quiescent
current drawn from the battery is only 10μA. The LTC3554
family are available in a 3mm
×
3mm
×
0.75mm 20-lead
QFN package.
L,
LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and PowerPath, Hot Swap 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, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390.
*See table on page 2 for available options.
FeaTures
n
n
n
n
n
n
n
n
n
n
n
10μA Standby Mode Quiescent Current (All Outputs On)
Seamless Transition Between Input Power Sources:
Li-Ion/Polymer Battery and USB
240mΩ Internal Ideal Diode
Dual High Efficiency Step-Down Switching Regulators
(200mA I
OUT
) with Adjustable Output Voltages
Pushbutton On/Off Control with System Reset
Reset Time: 5 sec (LTC3554/LTC3554-1),
14 sec (LTC3554-2/LTC3554-3)
Full Featured Li-Ion/Polymer Battery Charger
Programmable Charge Current with Thermal Limiting
Instant-On Operation with Discharged Battery
Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/
LTC3554-3), 4.1V (LTC3554-1)
3mm
×
3mm
×
0.75mm 20-Lead QFN Package
applicaTions
n
n
n
n
USB-Based Handheld Products
Portable Li-Ion/Polymer Based Electronic Devices
Fitness Computers
Low Power Medical Devices
Typical applicaTion
4.35V TO 5.5V
USB INPUT
100k
10µF
V
BUS
NTC
100k
T
PROG
1.87k
HPWR
SUSP
BVIN
V
OUT
LTC3554
CHRG
BAT
10µF
SYSTEM
LOAD
Battery Drain Current
vs Temperature
14
BATTERY DRAIN CURRENT (µA)
V
BAT
= 3.8V
STBY = 3.8V
12 REGULATORS LOAD = 0mA
BOTH REGULATORS
10 ENABLED
8
6
4
2
HARD RESET
0
–75 –50 –25 0
25 50 75
TEMPERATURE (°C)
100 125
3554 TA01b
+
Li-Ion
BATTERY
2.2µF
4.7µH
PWR_ON1
SW1
10pF
2.05M
649k
10µH
SW2
10pF
FB2
3554 TA01a
3.3V
200mA
10µF
ONE REGULATOR ENABLED
BOTH REGULATORS DISABLED
FSEL
STBY
PGOOD
PWR_ON2
PBSTAT
ON
ON/OFF
FB1
1.2V
200mA
332k
649k
10µF
3554123ff
1

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