FeaTures
n
LTC4088
High Efficiency Battery
Charger/USB Power Manager
DescripTion
The LTC
®
4088 is a high efficiency USB PowerPath™
controller and Li-Ion/Polymer battery charger. It includes
a synchronous switching input regulator, a full-featured
battery charger and an ideal diode. Designed specifically
for USB applications, the LTC4088’s switching regulator
automatically limits its input current to either 100mA,
500mA or 1A for wall-powered applications via logic
control.
The switching input stage provides power to V
OUT
where
power sharing between the application circuit and the
battery charger is managed. Unlike linear PowerPath
controllers, the LTC4088’s switching input stage can use
nearly all of the 0.5W or 2.5W available from the USB port
with minimal power dissipation. This feature allows the
LTC4088 to provide more power to the application and
eases thermal issues in space-constrained applications.
An ideal diode ensures that system power is available
from the battery when the input current limit is reached
or if the USB or wall supply is removed.
The LTC4088 is available in the low profile 14-lead 4mm
× 3mm × 0.75mm DFN surface mount package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath, Bat-Track and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118.
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Switching Regulator Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
180mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Seamlessly Provides Low
Loss Power Path When Input Power is Limited or
Unavailable
Full Featured Li-Ion/Polymer Battery Charger
V
BUS
Operating Range: 4.25V to 5.5V (7V Absolute
Maximum—Transient)
1.2A Maximum Input Current Limit
1.5A Maximum Charge Current with Thermal Limiting
Bat-Track™ Adaptive Output Control
Slew Control Reduces Switching EMI
Low Profile (0.75mm) 14-Lead 4mm × 3mm DFN
Package
applicaTions
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Media Players
Digital Cameras
GPS
PDAs
Smart Phones
Typical applicaTion
High Efficiency Battery Charger/USB Power Manager
WALL
100
3.3µH
V
BUS
SW V
OUT
D0
D1
GATE
LTC4088
D2
BAT
CHRG
LDO3V3
CLPROG
PROG C/X GND NTC
8.2
Li-Ion
SYSTEM
LOAD
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
4088 TA01a
Switching Regulator Efficiency to
System Load (P
OUT
/P
BUS
)
USB
10µF
BAT = 4.2V
BAT = 3.3V
3.3V
1µF
0.1µF
10µF
+
2.94k
499
0
0.01
V
BUS
= 5V
I
BAT
= 0mA
10x MODE
0.1
I
OUT
(A)
1
4088 TA01b
4088fb
1
LTC4088
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
NTC
CLPROG
LDO3V3
D2
C/X
PROG
CHRG
1
2
3
4
5
6
7
15
14 D1
13 D0
12 SW
11 VBUS
10 V
OUT
9 BAT
8 GATE
V
BUS
(Transient) t < 1ms, Duty Cycle < 1% .. –0.3V to 7V
V
BUS
(Static), BAT,
CHRG,
NTC, D0,
D1, D2 .......................................................... –0.3V to 6V
I
CLPROG
....................................................................3mA
I
PROG
, I
C/X
................................................................2mA
I
LDO3V3
...................................................................30mA
I
CHRG
......................................................................75mA
I
OUT
............................................................................2A
I
SW
..............................................................................2A
IBAT ............................................................................2A
Maximum Operating Junction Temperature .......... 125°C
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC4088EDE#PBF
TAPE AND REEL
LTC4088EDE#TRPBF
PART MARKING
4088
PACKAGE DESCRIPTION
14-Lead (4mm × 3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard 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
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, R
CLPROG
= 2.94k, unless otherwise noted.
SYMBOL
V
BUS
I
BUS(LIM)
PARAMETER
Input Supply Voltage
Total Input Current
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
CONDITIONS
l
l
l
l
l
l
elecTrical characTerisTics
Input Power Supply
MIN
4.35
92
445
815
0.32
1.6
TYP
MAX
5.5
UNITS
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
4088fb
97
470
877
0.39
2.05
6
14
14
0.038
0.038
224
1133
2140
11.3
59.4
100
500
1000
0.50
2.5
I
BUSQ
(Note 4)
Input Quiescent Current
h
CLPROG
(Note 4) Ratio of Measured V
BUS
Current to
CLPROG Program Current
2
LTC4088
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, R
CLPROG
= 2.94k, unless otherwise noted.
SYMBOL
I
OUT
PARAMETER
V
OUT
Current Available Before
Discharging Battery
CONDITIONS
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Low Power Suspend Mode
High Power Suspend Mode
1x, 5x, 10x Modes
Suspend Modes
Rising Threshold
Falling Threshold
Rising Threshold
Falling Threshold
1x, 5x, 10x Modes, 0V < BAT ≤ 4.2V,
I
OUT
= 0mA, Battery Charger Off
USB Suspend Modes, I
OUT
= 250µA
f
OSC
R
PMOS
R
NMOS
I
PEAK
R
SUSP
Battery Charger
V
FLOAT
I
CHG
I
BAT
BAT Regulated Output Voltage
Constant-Current Mode Charge Current
Battery Drain Current
0°C ≤ T
A
≤ 85°C
R
PROG
= 1k
R
PROG
= 5k
V
BUS
> V
UVLO
, PowerPath Switching
Regulator On, Battery Charger Off,
I
OUT
= 0µA
V
BUS
= 0V, I
OUT
= 0µA (Ideal Diode Mode)
V
PROG
V
PROG,TRKL
h
PROG
V
TRKL
ΔV
TRKL
V
RECHRG
t
TERM
t
BADBAT
I
C/X
V
C/X
h
C/X
V
CHRG
I
CHRG
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle
Charge
Ratio of I
BAT
to PROG Pin Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage
Safety Timer Termination Period
Bad Battery Termination Time
Battery Charge Current at Programmed
End of Charge Indication
C/X Threshold Voltage
Battery Charge Current Ratio to C/X
CHRG
Pin Output Low Voltage
CHRG
Pin Input Current
I
CHRG
= 5mA
BAT = 4.5V, V
CHRG
= 5V
Threshold Voltage Relative to V
FLOAT
Timer Starts when V
BAT
= V
FLOAT
BAT < V
TRKL
R
C/X
= 1k
R
C/X
= 5k
–80
3.2
0.4
85
BAT Rising
2.7
BAT < V
TRKL
4.179
4.165
980
192
4.200
4.200
1030
206
3.5
4.221
4.235
1080
220
5
V
V
mA
mA
µA
Switching Frequency
PMOS On Resistance
NMOS On Resistance
Peak Inductor Current Clamp
Suspend LDO Output Resistance
1x, 5x Modes
10x Mode
3.5
4.5
1.8
3.95
MIN
TYP
135
672
1251
0.32
2.04
1.188
100
4.30
4.00
200
50
BAT + 0.3
4.6
2.25
0.18
0.30
2
3
15
4.7
4.7
2.7
4.35
MAX
UNITS
mA
mA
mA
mA
mA
V
mV
V
V
mV
mV
V
V
MHz
Ω
Ω
A
A
Ω
elecTrical characTerisTics
0.26
1.6
0.41
2.46
V
CLPROG
V
UVLO
V
DUVLO
V
OUT
CLPROG Servo Voltage in Current Limit
V
BUS
Undervoltage Lockout
V
BUS
to BAT Differential Undervoltage
Lockout
V
OUT
Voltage
23
1.000
0.100
1031
2.85
135
–100
4.0
0.5
100
20
100
1031
65
0
35
µA
V
V
mA/mA
3.0
–120
4.8
0.6
115
V
mV
mV
Hour
Hour
mA
mA
mV
mA/mA
100
1
mV
µA
4088fb
3
LTC4088
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, R
CLPROG
= 2.94k, unless otherwise noted.
SYMBOL
R
ON_CHG
T
LIM
NTC
V
COLD
V
HOT
V
DIS
I
NTC
Ideal Diode
V
FWD
R
DROPOUT
I
MAX
V
LDO3V3
R
OL3V3
R
CL3V3
V
IL
V
IH
I
PD
Forward Voltage Detection
Internal Diode On Resistance, Dropout
Diode Current Limit
Regulated Output Voltage
Open-Loop Output Resistance
Closed-Loop Output Resistance
Input Low Voltage
Input High Voltage
Static Pull-Down Current
V
PIN
= 1V
1.2
2
0mA < I
LDO3V3
< 25mA
I
OUT
= 10mA
V
BUS
= 0V, I
OUT
= 10mA
I
OUT
= 200mA
2
3.1
3.3
25
3.6
0.4
3.4
15
2
0.18
mV
mV
Ω
A
V
Ω
Ω
V
V
µA
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
75.0
33.4
0.7
–50
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
PARAMETER
Battery Charger Power FET
On-Resistance (Between V
OUT
and BAT)
Junction Temperature in Constant
Temperature Mode
CONDITIONS
I
BAT
= 200mA
MIN
TYP
0.18
110
MAX
UNITS
Ω
°C
elecTrical characTerisTics
Always On 3.3V Supply
Logic (D0, D1, D2)
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 LTC4088E 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 LTC4088E includes overtemperature protection that is
intended to protect the device during momentary overload conditions.
Junction temperature 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
BUSQ
, and
measured current given by V
CLPROG
/R
CLPROG
• (h
CLPROG
+ 1)
4088fb
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LTC4088
Typical perForMance characTerisTics
Ideal Diode V-I Characteristics
1.0
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
RESISTANCE (Ω)
0.25
T
A
= 25°C, unless otherwise noted.
Output Voltage vs Output Current
(Battery Charger Disabled)
4.50
V
BAT
= 4V
V
BUS
= 5V
5x MODE
Ideal Diode Resistance
vs Battery Voltage
0.8
CURRENT (A)
0.20
OUTPUT VOLTAGE (V)
INTERNAL IDEAL
DIODE
4.25
0.6
INTERNAL IDEAL
DIODE ONLY
0.15
4.00
V
BAT
= 3.4V
0.4
0.2
0.10
0.05
0
V
BUS
= 0V
V
BUS
= 5V
0
0.04
0.12
0.16
0.08
FORWARD VOLTAGE (V)
0.20
4088 G01
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
3.75
3.50
0
2.7
3.0
3.6
3.9
3.3
BATTERY VOLTAGE (V)
4.2
4088 G02
3.25
0
200
600
800
400
OUTPUT CURRENT (mA)
1000
4088 G03
USB Limited Battery Charge
Current vs Battery Voltage
700
600
CHARGE CURRENT (mA)
500
400
300
200
100
5x USB SETTING,
BATTERY CHARGER SET FOR 1A
3.0
3.3
3.6
3.9
4.2
4088 G04
USB Limited Battery Charge
Current vs Battery Voltage
150
125
CHARGE CURRENT (mA)
100
75
50
25
0
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 2.94k
BATTERY CURRENT (µA)
25
Battery Drain Current
vs Battery Voltage
I
OUT
= 0µA
V
BUS
= 0V
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 2.94k
20
15
10
5
V
BUS
= 5V
(SUSPEND MODE)
0
2.7
1x USB SETTING,
BATTERY CHARGER SET FOR 1A
2.7
3.0
3.3
3.6
3.9
BATTERY VOLTAGE (V)
4.2
4088 G05
0
2.7
3.0
BATTERY VOLTAGE (V)
3.6
3.9
3.3
BATTERY VOLTAGE (V)
4.2
4088 G06
PowerPath Switching Regulator
Efficiency vs Output Current
100
90
EFFICIENCY (%)
80
70
60
50
40
0.01
V
BAT
= 3.8V
1x MODE
90
5x, 10x MODE
88
EFFICIENCY (%)
Battery Charging Efficiency vs
Battery Voltage with No External
Load (P
BAT
/P
BUS
)
R
CLPROG
= 2.94k
R
PROG
= 1k
I
OUT
= 0mA
V
BUS
CURRENT (µA)
5x CHARGING
EFFICIENCY
V
BUS
Current vs V
BUS
Voltage
(Suspend)
50
I
OUT
= 0mA
40
86
1x CHARGING
EFFICIENCY
30
84
82
20
10
0.1
OUTPUT CURRENT (A)
1
4088 G07
80
2.7
3.0
3.6
3.9
3.3
BATTERY VOLTAGE (V)
4.2
4088 G08
0
1
2
4
V
BUS
VOLTAGE (V)
3
5
6
4088 G09
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