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PDF LTC3577-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC3577-4 | |
| Descripción | Highly Integrated Portable Product PMIC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
357734fa
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LTC3577-3/LTC3577-4
ELECTRICAL CHARACTERISTICS Power Manager. The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = 0V,
VINLDO2 = VINLOD1 = VIN12 = VIN3 = VOUT, RPROG = 2k, RCLPROG = 2.1k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
NTC, Battery Discharge Protection
VCOLD
VHOT
VTOO_HOT
Cold Temperature Fault Threshold
Voltage
Hot Temperature Fault Threshold
Voltage
NTC Discharge Threshold Voltage
Rising NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
75 76 77 %VNTCBIAS
1.3 %VNTCBIAS
34 35 36 %VNTCBIAS
1.3 %VNTCBIAS
24.5 25.5 26.5 %VNTCBIAS
50 mV
INTC
IBAT2HOT
VBAT2HOT
Ideal Diode
NTC Leakage Current
BAT Discharge Current
BAT Discharge Threshold
VNTC = VBUS = 5V
VBAT = 4.1V, NTC < VTOO_HOT
IBAT < 0.1mA, NTC < VTOO_HOT
–50
170
3.9
50
nA
mA
V
VFWD
Forward Voltage Detection
RDROPOUT
Diode On-Resistance, Dropout
IMAX Diode Current Limit
Overvoltage Protection
IOUT = 10mA
IOUT = 200mA
(Note 7)
5 15 25
200
3.6
mV
mΩ
A
VOVCUTOFF
VOVGATE
Overvoltage Protection Threshold
OVGATE Output Voltage
IOVSENSQ
OVSENS Quiescent Current
tRISE OVGATE Time to Reach Regulation
Wall Adapter and High Voltage Buck Output Control
VACPR
ACPR Pin Output High Voltage
ACPR Pin Output Low Voltage
VW Absolute Wall Input Threshold Voltage
ΔVW
IQWALL
Differential Wall Input Threshold
Voltage
Wall Operating Quiescent Current
Logic (ILIM0, ILIM1 and CHRG)
VIL Input Low Voltage
VIH Input High Voltage
IPD
VCHRG
ICHRG
Static Pull-Down Current
CHRG Pin Output Low Voltage
CHRG Pin Input Current
Rising Threshold, ROVSENS = 6.2k
Input Below VOVCUTOFF
Input Above VOVCUTOFF
VOVSENS = 5V
COVGATE = 1nF
IACPR = 0.1mA
IACPR = 1mA
VWALL Rising
VWALL Falling
VWALL – VBAT Falling
VWALL – VBAT Rising
IWALL + IVOUT, IBAT = 0mA,
WALL = VOUT = 5V
ILIM0, ILIM1
ILIM0, ILIM1
ILIM0, ILIM1; VPIN = 1V
ICHRG = 10mA
VBAT = 4.5V, VCHRG = 5V
6.10 6.35 6.70
1.88 • VOVSENS 12
0
40
2.5
VOUT – 0.3
3.1
0
VOUT
0
4.3
3.2
25
75
440
0.3
4.45
100
0.4
1.2
2
0.15 0.4
01
V
V
V
μA
ms
V
V
V
V
mV
mV
μA
V
V
μA
V
μA
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LTC3577-3/LTC3577-4
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified
Battery Current and Voltage
vs Time
600
CHRG
500
VBAT
400
6
5
4
300 3
200
1450mAhr
CELL
100 VBUS = 5V
RPROG = 2k
RCLPROG = 2k
0
012
SAFETY
TIMER 2
TERMINATION
C/10 1
IBAT
0
34
56
TIME (HOUR)
357734 G07
Battery Float Voltage Load
Regulation (LTC3577-3)
4.24
VBUS = 5V
4.22 10x MODE
4.20
4.18
4.16
4.14
4.12
4.10
0
200 400 600 800 1000
IBAT (mA)
357734 G08
Battery Regulation (Float)
Voltage vs Temperature
4.24
IBAT = 2mA
4.22
LTC3577-3
4.20
4.18
4.16
4.14
4.12
LTC3577-4
4.10
4.08
4.06
4.04
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
357734 G09
IBAT vs VBAT (LTC3577-3)
600
500
IBAT vs VBAT (LTC3577-4)
600
RCLPROG = 2.1k
RPROG = 2k
500 VBUS = 5V
10x MODE
400
300
FALLING
VBAT
200
RISING
VBAT
VBUS = 5V
100 10x MODE
RPROG = 2k
RCLPROG = 2k
0
2.0 2.4 2.8 3.2 3.6 4.0 4.4
VBAT (V)
357734 G10
Forward Voltage vs Ideal Diode
Current (with Si2333DS External FET)
40
VBAT = 3.8V
35 VBUS = 0V
TA = 25°C
30
25
20
400
RISING
VBAT
300
FALLING
VBAT
200
100
0
2.0 2.4 2.8 3.2 3.6
VBAT (V)
Input Connect Waveform
VBUS
5V/DIV
VOUT
5V/DIV
IBUS
0.5A/DIV
15 IBAT
0.5A/DIV
10
5
0
0 0.2 0.4 0.6 0.8 1.0
IBAT (A)
357734 G12
VBAT = 3.75V
IOUT = 100mA
RCLPROG = 2k
RPROG = 2k
1ms/DIV
4.0 4.4
357734 G54
357734 G25
Forward Voltage vs Ideal Diode
Current (No External FET)
0.25
VBUS = 0V
TA = 25°C
VBAT = 3.2V
0.20
VBAT = 3.6V
VBAT = 4.2V
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1.0 1.2
IBAT (A)
357734 G11
Input Disconnect Waveform
VBUS
5V/DIV
VOUT
5V/DIV
IBUS
0.5A/DIV
IBAT
0.5A/DIV
VBAT = 3.75V
IOUT = 100mA
RCLPROG = 2k
RPROG = 2k
1ms/DIV
357734 G26
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3577-4.PDF ] | |
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