Product PMIC. LTC3577-4 Datasheet

LTC3577-4 PMIC. Datasheet pdf. Equivalent

Part LTC3577-4
Description Highly Integrated Portable Product PMIC
Feature www.DataSheet4U.com FEATURES n n n n n n n n n n n n LTC3577-3/LTC3577-4 Highly Integrated Portabl.
Manufacture Linear Technology
Datasheet
Download LTC3577-4 Datasheet




LTC3577-4
www.DataSheet4U.com
LTC3577-3/LTC3577-4
Highly Integrated
Portable Product PMIC
FEATURES
DESCRIPTION
n Full Featured Li-Ion/Polymer Charger/PowerPath™
Control with Instant-On Operation
n Triple Adjustable High Efficiency Step-Down
Switching Regulators (800mA, 500mA, 500mA IOUT)
n I2C Adjustable SW Slew Rates 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 Integrated 40V Series LED Back Light Driver with 60dB
Brightness Control and Gradation via I2C
n 1.5A Maximum Charge Current with Thermal Limiting
n Battery Float Voltage: 4.2V (LTC3577-3)
4.1V (LTC3577-4)
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
The LTC®3577-3/LTC3577-4 are highly integrated power
management ICs for single cell Li-Ion/Polymer battery ap-
plications. It includes a PowerPath manager with automatic
load prioritization, a battery charger, an ideal diode, input
overvoltage protection and numerous other internal pro-
tection features. The LTC3577-3/LTC3577-4 are 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 programmed input current limit (100mA or
500mA modes). The LTC3577-3/LTC3577-4 reduce the bat-
tery 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
LTC3577-3/LTC3577-4 also include a pushbutton input to
control power sequencing and system reset. The onboard
LED backlight boost circuitry can drive up to 10 series
LEDs and includes versatile digital dimming via the I2C
input. The LTC3577-3/LTC3577-4 are designed to support
the SiRF Atlas IV processor and has pushbutton timing
and sequencing different from other LTC3577 versions.
The LTC3577-3/LTC3577-4 are available in a low profile
4mm × 7mm × 0.75mm 44-pin QFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. PowerPath is a trademark 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
100mA/500mA
1000mA
OVERVOLTAGE
PROTECTION
CHARGE
2
CC/CV
CHARGER
0V
LTC3577-3/LTC3577-4 NTC
I2C PORT
DUAL LDO
REGULATORS
LED BACKLIGHT WITH DIGITALLY
CONTROLLED DIMMING
VOUT
+ SINGLE CELL
Li-Ion
0.8V to 3.6V/150mA
0.8V to 3.6V/150mA
4 TO 10 LED
BOOST
TRIPLE HIGH
PB
PUSHBUTTON
CONTROL
EFFICIENCY
STEP-DOWN
SWITCHING
0.8V to 3.6V/800mA
0.8V to 3.6V/500mA
0.8V to 3.6V/500mA
REGULATORS 357734 TA01a
10-LED Driver Efficiency
90
80
70
60
MAX PWM
CONSTANT
50 CURRENT
40
30
20
10
0
1.E-06
1.E-05 1.E-04 1.E-03 1.E-02 1.E-01
LED CURRENT (A)
357734 TA01b
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LTC3577-4
wwwL.DTataCShe3et45U.c7om7-3/LTC3577-4
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.........................................................................................................................................................16
BLOCK DIAGRAM ......................................................................................................................................................19
OPERATION ...............................................................................................................................................................20
PowerPath OPERATION .........................................................................................................................................20
LOW DROPOUT LINEAR REGULATOR OPERATION...............................................................................................29
STEP-DOWN SWITCHING REGULATOR OPERATION ............................................................................................30
LED BACKLIGHT/BOOST OPERATION ...................................................................................................................34
I2C OPERATION .....................................................................................................................................................37
PUSHBUTTON INTERFACE OPERATION ................................................................................................................43
LAYOUT AND THERMAL CONSIDERATIONS .........................................................................................................47
TYPICAL APPLICATION..............................................................................................................................................49
PACKAGE DESCRIPTION............................................................................................................................................51
RELATED PARTS........................................................................................................................................................52
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