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LTC3556EUFD#PBF

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LTC3556
1
3556f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Effi ciency USB Power
Manager with Dual Buck
and Buck-Boost DC/DCs
The LTC
®
3556 is a highly integrated power management
and battery charger IC for Li-Ion/Polymer battery applica-
tions. It includes a high effi ciency current limited switching
PowerPath manager with automatic load prioritization, a
battery charger, an ideal diode, and three synchronous
switching regulators (two bucks and one buck-boost).
Designed specifically for USB applications, the LTC3556’s
switching power manager automatically limits input cur-
rent to a maximum of either 100mA or 500mA for USB
applications or 1A for adapter-powered applications.
The LTC3556’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 LTC3556 to provide more power to the application and
eases the constraint of thermal budgeting in small spaces.
The two buck regulators can provide up to 400mA each
and the buck-boost can deliver 1A.
The LTC3556 is available in the low profi le 28-pin (4mm
× 5mm × 0.75mm) QFN surface mount package.
High Effi ciency PowerPath Manager, Dual Buck, Buck-Boost and LDO
POWER MANAGER
n
High Effi ciency Switching PowerPath
TM
Controller
with Bat-Track
TM
Adaptive Output Control
n
Programmable USB or Wall Current Limit
(100mA/500mA/1A)
n
Full Featured Li-Ion/Polymer Battery Charger
n
Instant-On Operation with a Discharged Battery
n
1.5A Maximum Charge Current
n
Internal 180m Ideal Diode Plus External Ideal Diode
Controller Powers Load in Battery Mode
n
Low No-Load I
Q
when Powered from BAT (<30µA)
DC/DCs
n
Dual High Effi ciency Buck DC/DCs (400mA/400mA I
OUT
)
n
High Effi ciency Buck-Boost DC/DC (1A I
OUT
)
n
All Regulators Operate at 2.25MHz
n
Dynamic Voltage Scaling on Two Buck Outputs
n
I
2
C Control of Enables, Mode, Two V
OUT
Settings
n
ENALL Pin with Power-Up Sequence Control
n
Low No-Load Quiescent Current: 20µA Each
n
HDD-Based MP3 Players, PDAs, GPS, PMPs
n
Other USB-Based Handheld Products
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 and 6404251.
Li-Ion
PGOODALL
0.8V TO 3.6V/400mA
3.3V/25mA
2.5V to 3.3V/1A
0.8V TO 3.6V/400mA
OPTIONAL
0V
T
TO OTHER
LOADS
+
LTC3556
DUAL HIGH EFFICIENCY
BUCKS
HIGH EFFICIENCY
BUCK-BOOST
I
2
C PORT
ALWAYS ON LDO
MEMORY
CORE
µP
RTC/LOW
POWER LOGIC
HDD/IO
3556 TA01
USB/WALL
4.5V TO 5.5V
CHARGE
I
2
C
USB COMPLIANT
STEP-DOWN
REGULATOR
CC/CV
BATTERY
CHARGER
SEQ
ENALL
3
1
2
3
Battery Charge Current
vs Battery Voltage
BATTERY VOLTAGE (V)
2.8
0
CHARGE CURRENT (mA)
200
3.2
3.6
3.8
100
700
400
500
600
300
3
3.4
4
4.2
3556 TA01b
BATTERY CHARGE CURRENT
500mA USB CURRENT LIMIT
EXTRA CURRENT
FOR FASTER CHARGING
V
BUS
= 5V
5X MODE
BATTERY CHARGER PROGRAMMED FOR 1A
LTC3556
2
3556f
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
BUS
(Transient) t < 1ms, Duty Cycle < 1% .. –0.3V to 7V
V
IN1
, V
IN2
, V
IN3
, V
BUS
(Static), DV
CC
,
FB1, FB2, NTC, BAT, ENALL, SCL, SDA,
PGOODALL, CHRG ....................................... –0.3V to 6V
SEQ ....................–0.3V to Lesser of 6V or (V
OUT
+ 0.3V)
FB3, V
C3
..............–0.3V to Lesser of 6V or (V
IN3
+ 0.3V)
I
CLPROG
....................................................................3mA
I
PGOODALL
, I
CHRG
....................................................50mA
I
PROG
........................................................................2mA
I
LDO3V3
...................................................................30mA
I
SW1
, I
SW2
............................................................600mA
I
SW
, I
BAT
, I
VOUT
.............................................................2A
I
SWAB3
, I
SWCD3
, I
VOUT3
.............................................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
(Note 1)
9 10
TOP VIEW
29
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
LDO3V3
CLPROG
NTC
SW1
V
IN1
FB1
FB3
V
C3
GATE
CHRG
PROG
SW2
V
IN2
FB2
SDA
PGOODALL
ENALL
SEQ
SW
V
BUS
V
OUT
BAT
SWAB3
DV
CC
V
IN3
V
OUT3
SCL
SWCD3
7
17
18
19
20
21
22
16
8
15
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BUS
= 5V, V
IN1
= V
IN2
= V
IN3
= V
OUT3
= 3.8V, BAT = 3.8V, DV
CC
= 3.3V,
R
PROG
= 1k, R
CLPROG
= 3.01k, unless otherwise noted.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3556EUFD#PBF LTC3556EUFD#TRPBF 3556
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PowerPath Switching Regulator
V
BUS
Input Supply Voltage 4.35 5.5 V
I
BUSLIM
Total Input Current 1x Mode, V
OUT
= BAT
5x Mode, V
OUT
= BAT
10x Mode, V
OUT
= BAT
Suspend Mode, V
OUT
= BAT
l
l
l
l
87
436
800
0.31
95
460
860
0.38
100
500
1000
0.50
mA
mA
mA
mA
I
VBUSQ
V
BUS
Quiescent Current 1x Mode, I
OUT
= 0mA
5x Mode, I
OUT
= 0mA
10x Mode, I
OUT
= 0mA
Suspend Mode, I
OUT
= 0mA
7
15
15
0.044
mA
mA
mA
mA
h
CLPROG
(Note 4) Ratio of Measured V
BUS
Current to
CLPROG Program Current
1x Mode
5x Mode
10x Mode
Suspend Mode
224
1133
2140
11.3
mA/mA
mA/mA
mA/mA
mA/mA
LTC3556
3
3556f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
OUT(POWERPATH)
V
OUT
Current Available Before Loading
BAT
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
135
672
1251
0.32
mA
mA
mA
mA
V
CLPROG
CLPROG Servo Voltage in Current
Limit
1x, 5x, 10x Modes
Suspend Mode
1.188
100
V
mV
V
UVLO_VBUS
V
BUS
Undervoltage Lockout Rising Threshold
Falling Threshold 3.95
4.30
4.00
4.35 V
V
V
UVLO_VBUS-BAT
V
BUS
to BAT Differential Undervoltage
Lockout
Rising Threshold
Falling Threshold
200
50
mV
mV
V
OUT
V
OUT
Voltage 1x, 5x, 10x Modes, 0V < BAT < 4.2V,
I
OUT
= 0mA, Battery Charger Off
3.4 BAT +
0.3
4.7 V
USB Suspend Mode, I
OUT
= 250µA 4.5 4.6 4.7 V
f
OSC
Switching Frequency
l
1.8 2.25 2.7 MHz
R
PMOS_POWERPATH
PMOS On-Resistance 0.18
R
NMOS_POWERPATH
NMOS On-Resistance 0.30
I
PEAK_POWERPATH
Peak Switch Current Limit 1x, 5x Modes
10x Mode
2
3
A
A
Battery Charger
V
FLOAT
BAT Regulated Output Voltage
l
4.179
4.165
4.200
4.200
4.221
4.235
V
V
I
CHG
Constant Current Mode Charge
Current
R
PROG
= 5k
980
185
1022
204
1065
223
mA
mA
I
BAT
Battery Drain Current V
BUS
> V
UVLO
, Battery Charger Off, I
OUT
= 0µA
V
BUS
= 0V, I
OUT
= 0µA (Ideal Diode Mode)
2 3.5
27
5
38
µA
µA
V
PROG
PROG Pin Servo Voltage 1.000 V
V
PROG_TRKL
PROG Pin Servo Voltage in Trickle
Charge
BAT < V
TRKL
0.100 V
V
C/10
C/10 Threshold Voltage at PROG 100 mV
h
PROG
Ratio of I
BAT
to PROG Pin Current 1022 mA/mA
I
TRKL
Trickle Charge Current BAT < V
TRKL
100 mA
V
TRKL
Trickle Charge Threshold Voltage BAT Rising 2.7 2.85 3.0 V
ΔV
TRKL
Trickle Charge Hysteresis Voltage 135 mV
V
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
–75 –100 –125 mV
t
TERM
Safety Timer Termination Timer Starts When BAT = V
FLOAT
3.3 4 5 Hour
t
BADBAT
Bad Battery Termination Time BAT < V
TRKL
0.42 0.5 0.63 Hour
h
C/10
End of Charge Indication Current Ratio (Note 5) 0.088 0.1 0.112 mA/mA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 65 100 mV
I
CHRG
CHRG Pin Leakage Current V
CHRG
= 5V 1 µA
R
ON_CHG
Battery Charger Power FET
On-Resistance (Between V
OUT
and BAT)
0.18
T
LIM
Junction Temperature in Constant
Temperature Mode
110 °C
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BUS
= 5V, V
IN1
= V
IN2
= V
IN3
= V
OUT3
= 3.8V, BAT = 3.8V, DV
CC
= 3.3V,
R
PROG
= 1k, R
CLPROG
= 3.01k, unless otherwise noted.
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LTC3556EUFD#PBF

Mfr. #:
Buy LTC3556EUFD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management High Efficiency USB Pwr Mgr + B/B + Dual Buck DC/DC
Lifecycle:
New from this manufacturer.
Delivery:
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