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 I when Powered from BAT (<30μA)
Q
1A BUCK-BOOST DC/DC
■
High Efficiency (1A I
OUT
)
■
2.25MHz Constant Frequency Operation
■
Low No-Load Quiescent Current (~13μA)
■
Zero Shutdown Current
■
Pin Control of All Functions
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 V
OUT
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.
APPLICATIONS
■
■
HDD Based MP3 Players, PDA, GPS, PMP Products
Other USB Based Handheld Products
TYPICAL APPLICATION
LTC3566/LTC3566-2 USB Power Manager with 3.3V/1A Buck-Boost
FROM AC
ADAPTER
FROM USB
4.7μF
100k
0.1μF
3.01k
2k
V
BUS
CLPROG
GATE
PROG
BAT
NTC
T 100k
CHRG
CHRGEN
ILIM0
DIGITAL CONTROL
ILIM1
MODE
EN1
GND
EXPOSED PAD
VC1
3566 TA01
3.3μH
V
OUT
=
BAT + 300mV
TO OTHER
DC/DCs
OPTIONAL
Switching Regulator Efficiency to
System Load (P
OUT
/P
BUS
)
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
V
BUS
= 5V
I
BAT
= 0mA
10x MODE
0.1
I
OUT
(A)
1
3566 TA01b
SW
V
OUT
10μF
BAT = 4.2V
BAT = 3.3V
+
Li-Ion
1μF
LTC3566/LTC3566-2
LDO3V3
V
IN1
SWAB1
2.2μH
SWCD1
V
OUT1
3.3V/25mA
ALWAYS
ON LDO
1μF
3.3V/1A
HDD
324k
10μF
FB1
1.3nF
105k
0
0.01
3566fb
1
LTC3566/LTC3566-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
CHRGEN
V
BUS
V
OUT
SWCD1
BAT
18 GATE
17 GND
25
16
CHRG
15 PROG
14 I
LIM1
13 I
LIM0
7
SWAB1
8
MODE
9 10 11 12
V
OUT1
GND
V
IN1
EN1
SW
V
BUS
(Transient) t < 1ms,
Duty Cycle < 1% ...................................... –0.3V to 7V
V
BUS
(Static), V
IN1
, BAT, NTC,
CHRG,
MODE, I
LIM0
,
I
LIM1
, EN1,
CHRGEN
................................ –0.3V to 6V
FB1, V
C1
.............. –0.3V to Lesser of 6V or (V
IN1
+ 0.3V)
I
CLPROG
....................................................................3mA
I
CHRG
......................................................................50mA
I
PROG
........................................................................2mA
I
LDO3V3
...................................................................30mA
I
SW
, I
BAT
, I
VOUT
............................................................2A
I
VOUT1
, I
SWAB1
, I
SWCD1
.............................................2.5A
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range................... –65°C to 125°C
24 23 22 21 20 19
LDO3V3 1
CLPROG 2
NTC 3
FB1 4
V
C1
5
GND 6
UF PACKAGE
24-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3566EUF#PBF
LTC3566EUF-2#PBF
TAPE AND REEL
LTC3566EUF#TRPBF
LTC3566EUF-2#TRPBF
PART MARKING
3566
35662
PACKAGE DESCRIPTION
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, DV
CC
= 3.3V, R
CLPROG
= 3.01k, R
PROG
= 1k,
V
IN1
= V
OUT1
= 3.8V unless otherwise noted.
SYMBOL
V
BUS
I
BUSLIM
PARAMETER
Input Supply Voltage
Total Input Current
1x Mode, V
OUT
= BAT
5x Mode, V
OUT
= BAT
10x Mode, V
OUT
= BAT
Suspend Mode, V
OUT
= BAT
1x Mode, I
OUT
= 0mA
5x Mode, I
OUT
= 0mA
10x Mode, I
OUT
= 0mA
Suspend Mode, I
OUT
= 0mA
1x Mode
5x Mode
10x Mode
Suspend Mode
●
●
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
4.35
87
436
800
0.31
TYP
MAX
5.5
UNITS
V
mA
mA
mA
mA
mA
mA
mA
mA
mA/mA
mA/mA
mA/mA
mA/mA
3566fb
Power Path Switching Regulator
95
460
860
0.38
7
15
15
0.044
224
1133
2140
11.3
100
500
1000
0.50
I
BUSQ
V
BUS
Quiescent Current
h
CLPROG
(Note 4)
Ratio of Measured V
BUS
Current to
CLPROG Program Current
2
LTC3566/LTC3566-2
ELECTRICAL CHARACTERISTICS
SYMBOL
I
OUT
(PowerPath)
PARAMETER
V
OUT
Current Available Before
Loading BAT
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, DV
CC
= 3.3V, R
CLPROG
= 3.01k, R
PROG
= 1k,
V
IN1
= V
OUT1
= 3.8V unless otherwise noted.
CONDITIONS
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
1x, 5x, 10x Modes
Suspend Mode
Rising Threshold
Falling Threshold
Rising Threshold
Falling Threshold
1x, 5x, 10x Modes, 0V < BAT < 4.2V,
I
OUT
= 0mA, Battery Charger Off
USB Suspend Mode, I
OUT
= 250μA
●
MIN
TYP
135
672
1251
0.32
1.188
100
MAX
UNITS
mA
mA
mA
mA
V
mV
V
CLPROG
V
UVLO_VBUS
V
UVLO_VBUS
-VBAT
CLPROG Servo Voltage in Current
Limit
V
BUS
Undervoltage Lockout
V
BUS
to BAT Differential
Undervoltage Lockout
V
OUT
Voltage
3.95
4.30
4.00
200
50
4.35
V
V
mV
mV
V
OUT
3.4
4.5
1.8
BAT + 0.3
4.6
2.25
0.18
0.30
4.7
4.7
2.7
V
V
MHz
Ω
Ω
A
A
f
OSC
Switching Frequency
R
PMOS_PowerPath
PMOS On-Resistance
R
NMOS_PowerPath
NMOS On-Resistance
I
PEAK_PowerPath
Battery Charger
V
FLOAT
I
CHG
I
BAT
BAT Regulated Output Voltage
●
Peak Switch Current Limit
1x, 5x Modes
10x Mode
4.179
4.165
980
185
2
2
3
4.200
4.200
1022
204
3.5
27
32
1.000
0.100
100
1022
4.221
4.235
1065
223
5
38
44
V
V
mA
mA
μA
μA
μA
V
V
mV
mA/mA
mA
Constant Current Mode Charge
Current
Battery Drain Current
R
PROG
= 5k
V
BUS
> V
UVLO
, Battery Charger Off,
I
OUT
= 0μA
V
BUS
= 0V, I
OUT
= 0μA (Ideal Diode Mode)
LTC3566
LTC3566-2
V
BAT
< V
TRIKL
V
PROG
V
PROG_TRIKL
V
C/10
h
PROG
I
TRKL
V
TRIKL
ΔV
TRKL
V
RECHRG
t
TERM
t
BADBAT
h
C/10
V
CHRG
I
CHRG
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle
Charge
C/10 Threshold Voltage at PROG
Ratio of I
BAT
to PROG Pin Current
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage
Safety Timer Termination
Bad Battery Termination Time
End of Charge Indication Current
Ratio
CHRG
Pin Output Low Voltage
CHRG
Pin Leakage Current
Threshold Voltage Relative to V
FLOAT
Timer Starts When BAT = V
FLOAT
BAT < V
TRKL
(Note 5)
I
CHRG
= 5mA
V
CHRG
= 5V
–75
3.3
0.42
0.088
BAT < V
TRKL
BAT Rising
2.7
100
2.85
135
–100
4
0.5
0.1
65
–125
5
0.63
0.112
100
1
3.0
V
mV
mV
Hour
Hour
mA/mA
mV
μA
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3
LTC3566/LTC3566-2
ELECTRICAL CHARACTERISTICS
SYMBOL
R
ON_CHG
T
LIM
NTC
V
COLD
V
HOT
V
DIS
I
NTC
Ideal Diode
V
FWD
R
DROPOUT
I
MAX_DIODE
V
LDO3V3
R
CL_LDO3V3
R
OL_LDO3V
V
IL
V
IH
I
PD1
I
PD1_CHRGEN
V
IN1
V
OUTUVLO
Forward Voltage
Internal Diode On-Resistance,
Dropout
Internal Diode Current Limit
Regulated Output Voltage
Closed-Loop Output Resistance
Dropout Output Resistance
Logic Low Input Voltage
Logic High Input Voltage
I
LIM0
, I
LIM1
, EN1, MODE
Pull-Down Currents
CHRGEN
Pull-Down Current
Input Supply Voltage
V
OUT
UVLO -V
OUT
Falling
V
OUT
UVLO - V
OUT
Rising
Oscillator Frequency
Input Current
V
IN1
Connected to V
OUT
Through
Low Impedance. Switching Regulator
Disabled in UVLO
PWM Mode
PWM Mode, I
OUT1
= 0μA
Burst Mode
®
Operation, I
OUT1
= 0μA
Shutdown
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, DV
CC
= 3.3V, R
CLPROG
= 3.01k, R
PROG
= 1k,
V
IN1
= V
OUT1
= 3.8V unless otherwise noted.
PARAMETER
Battery Charger Power FET On
Resistance (Between V
OUT
and BAT)
Junction Temperature in Constant
Temperature Mode
Cold Temperature Fault Threshold
Voltage
Hot Temperature Fault Threshold
Voltage
NTC Disable Threshold Voltage
NTC Leakage Current
Rising Threshold
Hysteresis
Falling Threshold
Hysteresis
Falling Threshold
Hysteresis
V
NTC
= V
BUS
= 5V
V
BUS
= 0V, I
OUT
= 10mA
I
OUT
= 10mA
V
BUS
= 0V
1.6
0mA < I
LDO3V3
< 25mA
3.1
3.3
4
23
0.4
1.2
1.6
1.6
2.7
2.5
2.6
2.8
2.25
220
13
0
10
5.5
2.9
2.7
400
20
1
3.5
75.0
33.4
0.7
–50
2
15
0.18
CONDITIONS
MIN
TYP
0.18
110
MAX
UNITS
Ω
°C
76.5
1.5
34.9
1.5
1.7
50
78.0
36.4
2.7
50
%V
BUS
%V
BUS
%V
BUS
%V
BUS
%V
BUS
mV
nA
mV
mV
Ω
A
V
Ω
Ω
V
V
μA
μA
V
V
V
MHz
μA
μA
μA
Always On 3.3V Supply
Logic (I
LIM0
, I
LIM1
, EN1,
CHRGEN,
MODE)
Buck-Boost Regulator
f
OSC
I
VIN1
1.8
Burst Mode is a registered trademark of Linear Technology Corporation.
3566fb
4
LTC3566/LTC3566-2
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OUT1(LOW)
V
OUT1(HIGH)
I
LIMF1
I
PEAK1(BURST)
I
ZERO1(BURST)
I
MAX1(BURST)
V
FB1
I
FB1
R
DS(ON)P
R
DS(ON)N
I
LEAK(P)
I
LEAK(N)
R
VOUT1
D
BUCK(MAX)
D
BOOST(MAX)
t
SS1
PARAMETER
Minimum Regulated Output Voltage
Maximum Regulated Output Voltage
Forward Current Limit (Switch A)
PWM Mode
●
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, DV
CC
= 3.3V, R
CLPROG
= 3.01k, R
PROG
= 1k,
V
IN1
= V
OUT1
= 3.8V unless otherwise noted.
CONDITIONS
For Burst Mode Operation or
Synchronous PWM Operation
5.50
2
200
–30
50
●
MIN
TYP
2.65
5.60
2.5
275
0
MAX
2.75
UNITS
V
V
3
350
30
A
mA
mA
mA
Forward Burst Current Limit (Switch Burst Mode Operation
A)
Reverse Burst Current Limit (Switch
D)
Burst Mode Operation
Maximum Deliverable Output Current 2.7V ≤ V
IN1
≤ 5.5V, 2.75V ≤ V
OUT
≤ 5.5V
in Burst Mode Operation
(Note 6)
Feedback Servo Voltage
FB1 Input Current
PMOS R
DS(ON)
NMOS R
DS(ON)
PMOS Switch Leakage
NMOS Switch Leakage
V
OUT1
Pull-Down in Shutdown
Maximum Buck Duty Cycle
Maximum Boost Duty Cycle
Soft-Start Time
PWM Mode
PWM Mode
●
0.780
–50
0.800
0.22
0.17
0.820
50
V
nA
Ω
Ω
V
FB1
= 0.8V
Switches A, D
Switches B, C
Switches A, D
Switches B, C
–1
–1
10
100
75
0.5
1
1
μA
μA
kΩ
%
%
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, I
VBUSQ
,
and measured current given by:
V
CLPROG
/R
CLPROG
• (h
CLPROG
+ 1)
Note 5:
h
C/10
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6:
Guaranteed by design.
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