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Linear Technology Electronic Components Datasheet

LTC3677-3 Datasheet

Highly Integrated Portable Product PMIC

No Preview Available !

Features
n Full Featured Li-Ion/Polymer Charger/PowerPath™
Controller with Instant-On Operation
n Triple Adjustable High Efficiency Step-Down
n
Switching Regulators (800mA,
I2C Adjustable SW Slew Rates
500mA, 500mA IOUT)
for EMI Reduction
n High Temperature Battery Voltage Reduction
Improves Safety and Reliability
n Overvoltage Protection Controller for USB (VBUS)/Wall
Inputs Provide Protection to 30V
n 1.5A Maximum Charge Current with Thermal Limiting
n Battery Float Voltage: 4.2V
n Pushbutton ON/OFF Control with System Reset
n Dual 150mA Current Limited LDOs
n Start-Up Timing Compatible with SiRF Atlas IV
Processor
n Small 4mm × 7mm 44-Pin QFN Package
Applications
n PNDs, DMB/DVB-H, Digital/Satellite Radio,
Media Players
n Portable Industrial/Medical Products
n Other USB-Based Handheld Products
LTC3677-3www.DataSheet4U.com
Highly Integrated
Portable Product PMIC
Description
The LTC®3677-3 is a highly integrated power management
IC for single-cell Li-Ion/Polymer battery applications.
It includes a PowerPath manager with automatic load
prioritization, a battery charger, an ideal diode, input over-
voltage protection and numerous other internal protection
features. The LTC3677-3 is designed to accurately charge
from current limited supplies such as USB by automatically
reducing charge current such that the sum of the load
current and the charge current does not exceed the pro-
grammed input current limit (100mA or 500mA modes).
The LTC3677-3 reduces the battery voltage at elevated
temperatures to improve safety and reliability. The three
step-down switching regulators and two LDOs provide
a wide range of available supplies. The LTC3677-3 also
includes a pushbutton input to control power sequencing
and system reset. The LTC3677-3 has pushbutton tim-
ing and sequencing designed to support the SiRF Atlas
IV processor. The LTC3677-3 is available in a low profile
4mm × 7mm × 0.75mm 44-pin QFN package.
L, LT, LTC, LTM, Linear Technology, PowerPath, Burst Mode and the Linear logo are registered
trademarks and Bat-Track and Hot Swap are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6522118, 6700364, 7511390, 5481178, 6580258. Other patents pending.
Typical Application
5V
ADAPTER
OPTIONAL
USB
OVERVOLTAGE
PROTECTION
CHARGE
2
PB
100mA/500mA
1000mA
CC/CV
CHARGER
LTC3677-3
0V
NTC
VOUT
+ SINGLE-CELL
Li-Ion
I2C PORT
PUSHBUTTON
CONTROL
DUAL LDO
REGULATORS
TRIPLE HIGH
EFFICIENCY
STEP-DOWN
SWITCHING
REGULATORS
36773 TA01a
0.8V to 3.6V/150mA
0.8V to 3.6V/150mA
0.8V to 3.6V/800mA
0.8V to 3.6V/500mA
0.8V to 3.6V/500mA
High Temperature BAT Discharge
200
180
VNTC < VTOO_HOT
VBUS = 0V
160
140
120
100
80
60
40
20
0
3.8 3.9 4.0
VBAT (V)
4.1 4.2
36773 TA01b
36773f



Linear Technology Electronic Components Datasheet

LTC3677-3 Datasheet

Highly Integrated Portable Product PMIC

No Preview Available !

LTC3677-3
www.DataSheet4U.com
Table of Contents
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics..........................................................................................10
Pin Functions......................................................................................................................15
Block Diagram....................................................................................................................18
Operation.......................................................................................................................... 19
PowerPath OPERATION......................................................................................................................................... 19
Low Dropout Linear Regulator Operation.............................................................................................................. 27
Step-Down Switching Regulator Operation........................................................................................................... 28
I2C Operation......................................................................................................................................................... 32
Pushbutton Interface Operation............................................................................................................................ 36
Layout and Thermal Considerations...................................................................................................................... 40
Typical Application...............................................................................................................42
Package Description.............................................................................................................43
Typical Application...............................................................................................................44
Related Parts......................................................................................................................44
36773f



Part Number LTC3677-3
Description Highly Integrated Portable Product PMIC
Maker Linear Technology
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