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PDF LTC3566 Data sheet ( Hoja de datos )
| Número de pieza | LTC3566 | |
| Descripción | High Effi ciency USB Power Manager Plus 1A Buck-Boost Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
POWER MANAGER
■ High Efficiency Switching PowerPath™ Controller
with Bat-Track™ Adaptive Output Control
■ Programmable USB or Wall Input Current Limit
(100mA/500mA/1A)
■ Full Featured Li-Ion/Polymer Battery Charger
■ Instant-On Operation with Discharged Battery
■ 1.5A Maximum Charge Current
■ Internal 180mΩ Ideal Diode Plus External Ideal Diode
Controller Powers Load in Battery Mode
■ Low No-Load IQ when Powered from BAT (<30μA)
1A BUCK-BOOST DC/DC
■ High Efficiency (1A IOUT)
■ 2.25MHz Constant Frequency Operation
■ Low No-Load Quiescent Current (~13μA)
■ Zero Shutdown Current
■ Pin Control of All Functions
APPLICATIONS
■ HDD Based MP3 Players, PDA, GPS, PMP Products
■ Other USB Based Handheld Products
LTC3566/LTC3566-2
High Efficiency USB
Power Manager Plus 1A
Buck-Boost Converter
DESCRIPTION
The LTC®3566 family are highly integrated power manage-
ment and battery charger ICs for Li-Ion/Polymer battery
applications. They include a high efficiency current lim-
ited switching PowerPath manager with automatic load
prioritization, a battery charger, an ideal diode, and a high
efficiency synchronous buck-boost switching regulator.
Designed specifically for USB applications, the LTC3566
family’s switching power manager automatically limits input
current to a maximum of either 100mA or 500mA for USB
applications or 1A for adapter-powered applications.
The LTC3566 family’s switching input stage transmits nearly
all of the 2.5W available from the USB port to the system
load with minimal power wasted as heat. This feature
allows the LTC3566 family to provide more power to the
application and eases the constraint of thermal budgeting in
small spaces. The LTC3566-2 automatically reduces charge
current to maintain a regulated 3.6V VOUT during low bat-
tery conditions; the LTC3566 does not. The synchronous
buck-boost DC/DC can provide up to 1A.
The LTC3566 family is available in a low profile 24-lead
4mm × 4mm QFN surface mount package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
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, 6404251.
TYPICAL APPLICATION
FROM AC
ADAPTER
FROM USB
LTC3566/LTC3566-2 USB Power Manager with 3.3V/1A Buck-Boost
3.3μH
4.7μF
100k
3.01k
0.1μF
2k
VBUS
CLPROG
PROG
SW
VOUT
GATE
BAT
T 100k
DIGITAL CONTROL
NTC
CHRG
CHRGEN
LTC3566/LTC3566-2
LDO3V3
VIN1
SWAB1
ILIM0
ILIM1
SWCD1
VOUT1
MODE
EN1
GND
EXPOSED PAD
FB1
VC1
3566 TA01
VOUT =
BAT + 300mV
10μF TO OTHER
DC/DCs
OPTIONAL
+
Li-Ion
1μF
3.3V/25mA
ALWAYS
ON LDO
2.2μH
1.3nF
324k
105k
1μF
3.3V/1A
HDD
10μF
Switching Regulator Efficiency to
System Load (POUT/PBUS)
100
90
80
70 BAT = 4.2V
60
BAT = 3.3V
50
40
30
20 VBUS = 5V
10 IBAT = 0mA
10x MODE
0
0.01
0.1
IOUT (A)
1
3566 TA01b
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1 page  
LTC3566/LTC3566-2
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, VBAT = 3.8V, DVCC = 3.3V, RCLPROG = 3.01k, RPROG = 1k,
VIN1 = VOUT1 = 3.8V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VOUT1(LOW)
Minimum Regulated Output Voltage For Burst Mode Operation or
Synchronous PWM Operation
2.65 2.75
V
VOUT1(HIGH)
ILIMF1
IPEAK1(BURST)
Maximum Regulated Output Voltage
Forward Current Limit (Switch A) PWM Mode
Forward Burst Current Limit (Switch Burst Mode Operation
A)
5.50 5.60
V
● 2 2.5 3
A
● 200 275 350 mA
IZERO1(BURST)
Reverse Burst Current Limit (Switch Burst Mode Operation
D)
● –30
0
30 mA
IMAX1(BURST)
Maximum Deliverable Output Current 2.7V ≤ VIN1 ≤ 5.5V, 2.75V ≤ VOUT ≤ 5.5V
in Burst Mode Operation
(Note 6)
50
mA
VFB1 Feedback Servo Voltage
● 0.780
0.800
0.820
V
IFB1 FB1 Input Current
VFB1 = 0.8V
–50 50 nA
RDS(ON)P
PMOS RDS(ON)
Switches A, D
0.22 Ω
RDS(ON)N
NMOS RDS(ON)
Switches B, C
0.17 Ω
ILEAK(P)
PMOS Switch Leakage
Switches A, D
–1 1 μA
ILEAK(N)
NMOS Switch Leakage
Switches B, C
–1 1 μA
RVOUT1
DBUCK(MAX)
VOUT1 Pull-Down in Shutdown
Maximum Buck Duty Cycle
PWM Mode
● 100
10
kΩ
%
DBOOST(MAX)
Maximum Boost Duty Cycle
PWM Mode
75 %
tSS1 Soft-Start Time
0.5 ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3566 family is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The LTC3566 family includes overtemperature protection that is
intended to protect the device during momentary overload conditions.
Junction temperatures will exceed 125°C when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
Note 4: Total input current is the sum of quiescent current, IVBUSQ,
and measured current given by:
VCLPROG/RCLPROG • (hCLPROG + 1)
Note 5: hC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6: Guaranteed by design.
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5 Page 
LTC3566/LTC3566-2
BLOCK DIAGRAM
21 VBUS
CLPROG
2
NTC
3
CHRG
16
CHRGEN
23
EN1
24
ILIM0
13
ILIM1
14
MODE
8
SUSPEND LDO
500μA/2.5mA
–
BATTERY
TEMPERATURE
MONITOR
+
CHARGE
STATUS
1.2V
CHRGEN
ILIM
DECODE
LOGIC
2.25MHz PowerPath
BUCK REGULATOR
3.6V
ENABLE
MODE
SW
22
LDO3V3
3.3V LDO
1
IDEAL
CC/CV
CHARGER
+–
0.3V
VOUT
20
+ GATE
18
–
15mV
BAT
19
PROG
15
VIN1
9
SWAB1
7
1A, 2.25MHz
BUCK-BOOST
REGULATOR
GND 6, 12, 17, 25
VOUT1
10
SWCD1
11
FB1
4
VC1
5
3566 BD
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11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC3566.PDF ] | |
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