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PDF LTC3576 Data sheet ( Hoja de datos )
| Número de pieza | LTC3576 | |
| Descripción | Switching Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3576/LTC3576-1
FEATURES
Switching Power Manager
with USB On-the-Go + Triple
Step-Down DC/DCs
DESCRIPTION
n Bidirectional Switching Regulator with Bat-
Track™ Adaptive Output Control Provides Efficient
Charging and a 5V Output for USB On-The-Go
n Bat-Track Control of External High Voltage Step-
Down Switching Regulator
n Overvoltage Protection Guards Against Damage
n “Instant-On” Operation with Discharged Battery
n Triple Step-Down Switching Regulators with I2C
Adjustable Outputs (1A/400mA/400mA IOUT)
n 180mΩ Internal Ideal Diode + External Ideal Diode
Controller Powers the Load in Battery Mode
n Li-Ion/Polymer Battery Charger (1.5A Max ICHG)
n Battery Float Voltage: 4.2V (LTC3576), 4.1V (LTC3576-1)
n Compact (4mm × 6mm × 0.75mm) 38-pin QFN Package
APPLICATIONS
n HDD-Based Media Players
n GPS, PDAs, Digital Cameras, Smart Phones
n Automotive Compatible Portable Electronics
The LTC®3576/LTC3576-1 are highly integrated power
management and battery charger ICs for Li-Ion/Polymer
battery applications. They each include a high efficiency,
bidirectional switching PowerPath™ manager with auto-
matic load prioritization, a battery charger, an ideal diode, a
controller for an external high voltage switching regulator
and three general purpose step-down switching regulators
with I2C adjustable output voltages. The internal switch-
ing regulators automatically limit input current for USB
compatibility and can also generate 5V at 500mA for USB
on-the-go applications when powered from the battery.
Both the USB and external switching regulator power paths
feature Bat-Track optimized charging to provide maximum
power to the application from supplies as high as 38V. An
overvoltage circuit protects the LTC3576/LTC3576-1 from
damage due to high voltage on the VBUS or WALL pins with
just two external components. The LTC3576/LTC3576-1 are
available in a low profile 38-pin (4mm × 6mm × 0.75mm)
QFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Bat-Track
and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 6522118, 6404251.
TYPICAL APPLICATION
High Efficiency PowerPath Manager with Overvoltage Protection
and Triple Step-Down Regulator
AUTOMOTIVE
FIREWIRE, ETC.
LT3653
USB OR
5V AC
ADAPTER
CHARGE
OVERVOLTAGE
PROTECTION
EXTERNAL HIGH VOLTAGE
BUCK CONTROLLER
USB COMPLIANT
BIDIRECTIONAL
SWITCHING
REGULATOR
CC/CV
BATTERY
CHARGER
0V
LTC3576/LTC3576-1
TO OTHER
LOADS
OPTIONAL
+
T Li-Ion
ENABLE 6
CONTROLS
ALWAYS ON LDO
TRIPLE
HIGH EFFICIENCY
STEP-DOWN
SWITCHING
REGULATORS
1
2
3
I2C PORT
3.3V/20mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/400mA
0.8V TO 3.6V/1A
RST
2
RTC/LOW
POWER LOGIC
MEMORY
I/O
CORE
μPROCESSOR
I2C
3576 TA01
PowerPath Switching Regulator Efficiency
to System Load (PVOUT/PVBUS)
100
90
80
BAT = 4.2V
70
BAT = 3.3V
60
50
40
30
20 VBUS = 5V
10 IBAT = 0mA
10x MODE
0
10
100
LOAD CURRENT (mA)
1000
3576 TA01b
3576f
1
1 page  
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LTC3576/LTC3576-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, DVCC = 3.3V, RCLPROG = 3.01k, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Always On 3.3V LDO Supply
VLDO3V3
Regulated Output Voltage
0mA < ILDO3V3 < 20mA
RCL_LDO3V3
Closed-Loop Output Resistance
ROL_LDO3V3
Dropout Output Resistance
Logic (ILIM0, ILIM1, EN1, EN2, EN3, ENOTG, and SCL, SDA when DVCC = 0V)
VIL Logic Low Input Voltage
VIH Logic High Input Voltage
IPD1 ILIM0, ILIM1, EN1, EN2, EN3, ENOTG, SCL,
SDA Pull-Down Current
I2C Port
DVCC
IDVCC
VDVCC(UVLO)
ADDRESS
Input Supply
DVCC Current
DVCC UVLO
I2C Address
SCL/SDA = 0kHz, DVCC = 3.3V
VIH, SDA, SCL
VIL, SDA, SCL
IPD2, SDA, SCL
VOL
fSCL
tBUF
Input High Threshold
Input Low Threshold
Pull-Down Current
Digital Output Low (SDA)
Clock Operating Frequency
Bus Free Time Between Stop and Start
Condition
ISDA = 3mA
tHD_STA
Hold Time After (Repeated) Start
Condition
tSU_STA
Repeated Start Condition Setup Time
tSU_STO
Stop Condition Setup Time
tHD_DAT(O)
Data Hold Time Output
tHD_DAT(I)
Data Hold Time Input
tSU_DAT
Data Setup Time
tLOW SCL Low Period
tHIGH
SCL High Period
tf SDA/SCL Fall Time
tr SDA/SCL Rise Time
tSP Input Spike Suppression Pulse Width
General Purpose Switching Regulators 1, 2 and 3
VIN1,2,3
VOUT(UVLO)
Input Supply Voltage
VOUT UVLO—VOUT Falling
VOUT UVLO—VOUT Rising
(Note 8)
VIN1,2,3 Connected to VOUT Through
Low Impedance. Switching
Regulators are Disabled in UVLO
fOSC
IFB1,2,3
D1,2,3
Switching Frequency
FBx Input Current
Maximum Duty Cycle
VFB1,2,3 = 0.85V
RSW1,2,3_PD
SWx Pull-Down in Shutdown
MIN TYP MAX
3.1 3.3 3.5
2.7
23
0.4
1.2
2
UNITS
V
Ω
Ω
V
V
μA
1.6 5.5
0.5
1.0
0001001[0]
70
30
2
0.4
400
1.3
0.6
0.6
0.6
0 900
0
100
1.3
0.6
20 300
20 300
50
2.7 5.5
2.5 2.6
2.8 2.9
1.8 2.25 2.7
–50 50
100
10
V
μA
V
%DVCC
%DVCC
μA
V
kHz
μs
μs
μs
μs
ns
ns
ns
μs
μs
ns
ns
ns
V
V
V
MHz
nA
%
kΩ
3576f
5
5 Page 
www.DataSheet4U.com
LTC3576/LTC3576-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
3.3V LDO Output Voltage vs
Load Current, VBUS = 0V
3.4
BAT = 3.9V, 4.2V BAT = 3.4V
BAT = 3.5V
3.2 BAT = 3.6V
3.3V LDO Step Response
(5mA to 15mA)
ILDO3V3
5mA/DIV
0mA
3.0
2.8 BAT = 3V
BAT = 3.1V
BAT = 3.2V
BAT = 3.3V
2.6
0
5 10 15 20
LOAD CURRENT (mA)
VLDO3V3
20mV/DIV
AC COUPLED
BAT = 3.8V
25
3576 G37
20μs/DIV
3576 G38
Switching Regulator Soft-Start
Waveform
Switching Regulator Current Limit
vs Temperature
2.0
REGULATOR 3
1.5
50μs/DIV
3576 G40
Switching Regulator Low Power
Quiescent Currents vs Temperature
100
90
PULSE-SKIP MODE
80
70
60
50
40
30
Burst Mode OPERATION
20
10 LDO MODE
0
–40 –15 10 35 60
TEMPERATURE (°C)
85
3576 G43
1.0
REGULATORS 1, 2
0.5
VIN1,2,3 = 3.8V
0
–40 –15 10
35
TEMPERATURE (°C)
60
85
3576 G41
Switching Regulators 1, 2
Pulse-Skip Mode Efficiency
100
VIN3 = 3.8V
90
VOUT1,2 = 2.5V
80 VOUT1,2 = 1.2V
70
VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1 1 10 100 1000
LOAD CURRENT (mA)
3576 G44
Battery Drain Current vs
Battery Voltage
35
IVOUT = 0mA
30
VBUS = 0V
25
20
15
10
VBUS = 5V
5 (SUSPEND MODE)
0
2.7 3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
3576 G39
RDS(ON) for Switching Regulator
Power Switches vs Temperature
1.0
REGULATORS 1, 2
0.8
NMOS SWITCH
0.6
PMOS SWITCH
0.4 REGULATOR 3
0.2 NMOS SWITCH
PMOS SWITCH
0
–40 –15 10 35 60
TEMPERATURE (°C)
85
3576 G42
Switching Regulators 1, 2
Burst Mode Efficiency
100
VIN3 = 3.8V VOUT1,2 = 2.5V
90
80 VOUT1,2 = 1.2V
70 VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1 1
10 100
LOAD CURRENT (mA)
1000
3576 G45
3576f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3576.PDF ] | |
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