LTC4088
High Efficiency Battery
Charger/USB Power Manager
FEATURES
■
DESCRIPTIO
■
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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
TM
Adaptive Output Control
Slew Control Reduces Switching EMI
Low Profile (0.75mm) 14-Lead 4mm
×
3mm DFN
Package
The LTC
®
4088 is a high efficiency USB PowerPath
TM
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 auto-
matically 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.
, LTC and LT 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
APPLICATIO S
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Media Players
Digital Cameras
GPS
PDAs
Smart Phones
TYPICAL APPLICATIO
WALL
High Efficiency Battery Charger/USB Power Manager
100
3.3µH
SYSTEM
LOAD
90
80
EFFICIENCY (%)
70
60
50
40
30
USB
10µF
3.3V
V
BUS
SW V
OUT
D0
D1
GATE
LTC4088
D2
BAT
CHRG
LDO3V3
CLPROG
PROG C/X GND NTC
8.2Ω
0.1µF
Li-Ion
10µF
1µF
2.94k
499Ω
+
4088 TA01a
20
10
U
Switching Regulator Efficiency to
System Load (P
OUT
/P
BUS
)
BAT = 4.2V
BAT = 3.3V
0
0.01
V
BUS
= 5V
I
BAT
= 0mA
10x MODE
0.1
I
OUT
(A)
1
4088 TA01b
U
U
4088f
1
LTC4088
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
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,
⎯
C
⎯
H
⎯
R
⎯
G, NTC, D0,
D1, D2.......................................................... –0.3V to 6V
I
CLPROG
....................................................................3mA
I
PROG
, I
C/X
................................................................2mA
I
LDO3V3
...................................................................30mA
I
⎯
C
⎯
H
⎯
R
⎯
G
......................................................................75mA
I
OUT
.............................................................................2A
I
SW
..............................................................................2A
I
BAT
.............................................................................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 PART NUMBER
LTC4088EDE
DE PART MARKING
4088
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
BUS
I
BUS(LIM)
PARAMETER
Input Supply Voltage
Total Input Current
Input Power Supply
The
●
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.
CONDITIONS
●
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
mA
mA
mA
mA
mA
V
mV
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
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
●
●
●
●
●
97
470
877
0.39
2.05
6
14
14
0.038
0.038
224
1133
2140
11.3
59.4
135
672
1251
0.4
2.04
1.188
100
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
I
OUT
V
OUT
Current Available Before
Discharging Battery
0.26
1.6
0.41
2.46
V
CLPROG
CLPROG Servo Voltage in Current Limit
2
U
4088f
W
U
U
W W
W
LTC4088
ELECTRICAL CHARACTERISTICS
SYMBOL
V
UVLO
V
DUVLO
V
OUT
PARAMETER
V
BUS
Undervoltage Lockout
V
BUS
to BAT Differential Undervoltage
Lockout
V
OUT
Voltage
The
●
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.
CONDITIONS
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
3.5
4.5
1.8
MIN
3.95
TYP
4.30
4.00
200
50
BAT + 0.3
4.6
2.25
0.18
0.30
1x, 5x Modes
10x Mode
2
3
15
4.179
4.165
980
192
4.200
4.200
1030
206
3.5
4.221
4.235
1080
220
5
4.7
4.7
2.7
MAX
4.35
UNITS
V
V
mV
mV
V
V
MHz
Ω
Ω
A
A
Ω
V
V
mA
mA
µA
f
OSC
R
PMOS
R
NMOS
I
PEAK
R
SUSP
Battery Charger
V
FLOAT
I
CHG
I
BAT
Switching Frequency
PMOS On Resistance
NMOS On Resistance
Peak Inductor Current Clamp
Suspend LDO Output Resistance
BAT Regulated Output Voltage
0°C ≤ T
A
≤ 85°C
Constant-Current Mode Charge Current
Battery Drain Current
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)
23
1.000
0.100
1031
35
µA
V
V
mA/mA
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
R
ON_CHG
T
LIM
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 Hystersis 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
Battery Charger Power FET
On-Resistance (Between V
OUT
and BAT)
Junction Temperature in Constant
Temperature Mode
I
CHRG
= 5mA
BAT = 4.5V, V
CHRG
= 5V
I
BAT
= 200mA
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
2.85
135
–100
4.0
0.5
100
20
100
1031
65
0
0.18
110
3.0
–120
4.8
0.6
115
V
mV
mV
Hour
Hour
mA
mA
mV
mA/mA
100
1
mV
µA
Ω
°C
4088f
3
LTC4088
ELECTRICAL CHARACTERISTICS
SYMBOL
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
The
●
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.
CONDITIONS
MIN
TYP
MAX
UNITS
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)
4088f
4
LTC4088
TYPICAL PERFOR A CE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
Ideal Diode V-I Characteristics
1.0
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
RESISTANCE (Ω)
0.25
0.8
CURRENT (A)
0.6
INTERNAL IDEAL
DIODE ONLY
0.4
INTERNAL IDEAL
DIODE
0.15
OUTPUT VOLTAGE (V)
0.2
V
BUS
= 0V
V
BUS
= 5V
0
0
0.04
0.12
0.16
0.08
FORWARD VOLTAGE (V)
0.20
4088 G01
USB Limited Battery Charge
Current vs Battery Voltage
700
600
CHARGE CURRENT (mA)
500
400
300
200
100
0
2.7
5x USB SETTING,
BATTERY CHARGER SET FOR 1A
3.0
3.3
3.6
3.9
4.2
4088 G04
100
75
50
25
0
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 2.94k
BATTERY CURRENT (µA)
CHARGE CURRENT (mA)
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 2.94k
BATTERY VOLTAGE (V)
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 (%)
V
BUS
CURRENT (µA)
0.1
OUTPUT CURRENT (A)
U W
1
4088 G07
Ideal Diode Resistance
vs Battery Voltage
4.50
Output Voltage vs Output Current
(Battery Charger Disabled)
V
BAT
= 4V
V
BUS
= 5V
5x MODE
0.20
4.25
4.00
V
BAT
= 3.4V
3.75
0.10
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
0.05
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
150
125
25
Battery Drain Current
vs Battery Voltage
I
OUT
= 0µA
V
BUS
= 0V
20
15
10
V
BUS
= 5V
(SUSPEND MODE)
5
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
3.6
3.9
3.3
BATTERY VOLTAGE (V)
4.2
4088 G06
Battery Charging Efficiency vs
Battery Voltage with No External
Load (P
BAT
/P
BUS
)
R
CLPROG
= 2.94k
R
PROG
= 1k
I
OUT
= 0mA
5x CHARGING
EFFICIENCY
86
1x CHARGING
EFFICIENCY
50
V
BUS
Current vs V
BUS
Voltage
(Suspend)
I
OUT
= 0mA
40
30
84
20
82
10
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
4088f
5
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