FEATURES
n
LTC4098/LTC4098-1
USB Compatible Switching
Power Managers/Li-Ion Chargers
with Overvoltage Protection
DESCRIPTION
The LTC
®
4098/LTC4098-1 are high efficiency USB Power-
Path controllers and full-featured Li-Ion/Polymer battery
chargers. They seamlessly manage power distribution from
multiple sources including USB, wall adapter, automotive,
Firewire or other high voltage DC/DC converters, and a
Li-Ion/Polymer battery.
The LTC4098/LTC4098-1’s internal switching regulator
automatically limits its input current for USB compatibility.
For automotive and other high voltage applications, the
LTC4098/LTC4098-1 interface with a Linear Technology
external switching regulator to provide a high efficiency
high voltage power path. Both the USB and the optional
high voltage inputs feature Bat-Track optimized charging
to provide maximum power to the application and ease
thermal issues in high power density applications with
input supplies from 5V to as high as 38V.
An overvoltage circuit protects the LTC4098/LTC4098-1
from high voltage damage on the USB/wall adaptor inputs
with an N-channel FET and a resistor.
The LTC4098/LTC4098-1 are available in the ultra-thin
(0.55mm) 20-lead 3mm
×
4mm QFN surface mount
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Bat-Track and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Switching Regulator with Bat-Track
TM
Adaptive
Output Control Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
Overvoltage Protection Guards Against Damage
Bat-Track External Step-Down Switching Regulator
Control Maximizes Efficiency from Automotive,
Firewire and Other High Voltage Input Sources
180mΩ Internal Ideal Diode Plus External Ideal Diode
Controller Seamlessly Provide Low Loss PowerPath
TM
when Input Power is Limited or Unavailable
Preset 4.2V Charge Voltage with 0.5% Accuracy
(4.1V for LTC4098-1)
4.1V Float Voltage (LTC4098-1) Improves Battery Life
and High Temperature Safety Margin
Instant-On Operation with Discharged Battery
700mA Maximum Load Current from USB Port
1.5A Maximum Charge Current with Thermal Limiting
Ultra-Thin (0.55mm) 20-Lead 3mm
×
4mm QFN
APPLICATIONS
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Media Players
GPS
PDAs
Smart Phones
TYPICAL APPLICATION
High Efficiency USB/Automotive Battery Charger with Overvoltage Protection
INPUT
AUTOMOTIVE,
FIREWIRE, ETC.
LT3653
3.3μH
INPUT
USB
SYSTEM
LOAD
EFFICIENCY (%)
USB Switching Regulator Efficiency
to System Load (P
VOUT
/P
VBUS
)
100
90
80
70
60
50
40
30
BAT = 4.2V
BAT = 3.3V
V
BUS
10μF
OVGATE
OVSENS
TO μC
3
D0-D2
CLPROG
V
C
WALL
SW
6.04k
LTC4098/LTC4098-1
V
OUT
BAT
PROG
GND BATSENS
10μF
20
10
0.1μF
3.01k
1k
+
Li-Ion
40981 TA01a
0
0.01
V
BUS
= 5V
I
BAT
= 0mA
10x MODE
0.1
I
VOUT
(A)
1
40981 TA01b
40981fb
1
LTC4098/LTC4098-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
WALL
ACPR
D2
16 D1
15 D0
21
14 SW
13 V
BUS
12 V
OUT
11 BAT
7
PROG
8
CHRG
9 10
IDGATE
GND
V
C
OVSENS 1
OVGATE 2
CLPROG 3
NTCBIAS 4
NTC 5
BATSENS 6
V
BUS
, WALL (Transient) t < 1ms,
Duty Cycle < 1% .......................................... –0.3V to 7V
V
BUS
, WALL (Static), BAT, BATSENS,
CHRG,
NTC, ................................................. –0.3V to 6V
D0, D1, D2 .........–0.3V to Max (V
BUS
, V
OUT
, BAT) + 0.3V
I
OVSENS
.................................................................±10mA
I
CLPROG
....................................................................3mA
I
PROG
........................................................................2mA
I
CHRG
......................................................................50mA
I
VOUT
, I
SW
, I
BAT
............................................................2A
I
ACPR
......................................................................10mA
Operating Temperature Range.................. –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range................... –65°C to 125°C
20 19 18 17
PDC PACKAGE
20-LEAD (3mm 4mm) PLASTIC UTQFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4098EPDC#PBF
LTC4098EPDC-1#PBF
TAPE AND REEL
LTC4098EPDC#TRPBF
LTC4098EPDC-1#TRPBF
PART MARKING
DDVT
DSZT
PACKAGE DESCRIPTION
20-Lead (3mm
×
4mm) Plastic UTQFN
20-Lead (3mm
×
4mm) Plastic UTQFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified 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 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
= 3.01k, unless otherwise noted.
SYMBOL
V
BUS
I
VBUS(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
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
40981fb
Input Power Supply
97
473
883
0.39
2.05
6
15
15
0.042
0.042
230
1164
2210
11.6
60
100
500
1000
0.5
2.5
I
VBUSQ
(Note 4)
Input Quiescent Current
h
CLPROG
(Note 4) Ratio of Measured V
BUS
Current to
CLPROG Program Current
2
LTC4098/LTC4098-1
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
= 3.01k, unless otherwise noted.
SYMBOL
I
VOUT
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
VOUT
= 0mA, Battery Charger Off
USB Suspend Modes, I
VOUT
= 250μA
f
OSC
R
PMOS
R
NMOS
I
PEAK
Switching Frequency
PMOS On-Resistance
NMOS On-Resistance
Peak Inductor Current Clamp
1x Mode
5x Mode
10x Mode
3.5
4.5
1.96
3.95
MIN
TYP
135
659
1231
0.32
2.04
1.188
100
4.30
4.00
200
50
BAT + 0.3
4.6
2.25
0.18
0.30
1.2
1.7
3
15
Rising Threshold
Falling Threshold
WALL-BAT Rising Threshold
WALL-BAT Falling Threshold
4.2
4.3
3.2
90
30
BAT + 0.3
100
I
ACPR
= 0mA
I
ACPR
= 0mA
Rising Threshold, R
OVSENS
= 6.04k
Input Below V
OVP
Input Above V
OVP
C
OVGATE
= 1nF
4.179
4.165
4.080
4.066
980
192
6.20
V
OUT
0
6.35
1.88 • V
OVSENSE
0
2.2
4.200
4.200
4.100
4.100
1030
206
3.7
4.221
4.235
4.121
4.134
1080
220
5
6.50
12
4.4
4.7
4.7
2.65
4.35
MAX
UNITS
mA
mA
mA
mA
mA
V
mV
V
V
mV
mV
V
V
MHz
Ω
Ω
A
A
A
Ω
V
V
mV
mV
V
μA
V
V
V
V
V
ms
V
V
V
V
mA
mA
μA
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
R
SUSP
V
WALL
ΔV
WALL
Suspend LDO Output Resistance
Absolute WALL Input Threshold
Differential WALL Input Threshold
Regulation Target
WALL Quiescent Current
ACPR
High Voltage
ACPR
Low Voltage
Bat-Track External Switching Regulator Control
0
3.5
45
Overvoltage Protection
V
OVP
V
OVGATE
t
RISE
Battery Charger
V
FLOAT
LTC4098 BAT Regulated Output Voltage
0°C ≤ T
A
≤ 85°C
LTC4098-1 BAT Regulated Output
Voltage
I
CHG
I
BAT
Constant-Current Mode Charge Current
Battery Drain Current
0°C ≤ T
A
≤ 85°C
R
PROG
= 1k, 10x Mode
R
PROG
= 5k, 5x, 10x Modes
V
BUS
> V
UVLO
, PowerPath Switching
Regulator On, Battery Charger Off,
I
VOUT
= 0μA
V
BUS
= 0V, I
VOUT
= 0μA (Ideal Diode
Mode)
Overvoltage Protection Threshold
OVGATE Output Voltage
OVGATE Time to Reach Regulation
25
35
μA
40981fb
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LTC4098/LTC4098-1
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
= 3.01k, unless otherwise noted.
SYMBOL
V
PROG
V
PROG,TRKL
h
PROG
V
TRKL
ΔV
TRKL
V
RECHRG
t
TERM
t
BADBAT
h
C/10
V
CHRG
I
CHRG
R
ON_CHG
T
LIM
NTC
V
COLD
V
HOT
V
DIS
I
NTC
Ideal Diode
V
FWD
R
DROPOUT
I
MAX
V
IL
V
IH
I
PD
Forward Voltage Detection
Internal Diode On-Resistance, Dropout
Diode Current Limit
Input Low Voltage
Input High Voltage
Static Pull-Down Current
V
PIN
= 1V
1.2
2
I
VOUT
= 10mA
I
VOUT
= 200mA
2
0.4
15
0.18
mV
Ω
A
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
NTC = 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
%NTCBIAS
%NTCBIAS
%NTCBIAS
%NTCBIAS
%NTCBIAS
mV
nA
PARAMETER
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
End of Charge Indication Current Ratio
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
Threshold Voltage Relative to V
FLOAT
Timer Starts When BAT = V
FLOAT
BAT < V
TRKL
(Note 5)
I
CHRG
= 5mA
BAT = 4.5V, V
CHRG
= 5V
I
BAT
= 200mA
–80
3.4
0.43
0.09
BAT Rising
2.7
BAT < V
TRKL
CONDITIONS
MIN
TYP
1.000
0.100
1030
2.85
130
–100
4
0.5
0.1
65
0
0.18
110
–120
4.6
0.58
0.11
100
1
3
MAX
UNITS
V
V
mA/mA
V
mV
mV
Hour
Hour
mA/mA
mV
μA
Ω
°C
ELECTRICAL CHARACTERISTICS
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 LTC4098E/LTC4098E-1 are 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 LTC4098E/LTC4098E-1 include 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
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 a 5k PROG resistor.
40981fb
4
LTC4098/LTC4098-1
TYPICAL PERFORMANCE CHARACTERISTICS
Ideal Diode V-I Characteristics
1.0
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
RESISTANCE ( )
0.25
T
A
= 25°C unless otherwise noted.
USB Compliant Load Current
Available Before Discharging Battery
800
750
Ideal Diode Resistance
vs Battery Voltage
0.8
CURRENT (A)
0.20
CURRENT (mA)
4.2
40981 G02
0.6
INTERNAL IDEAL
DIODE ONLY
0.4
INTERNAL IDEAL
DIODE
0.15
700
650
600
550 V
BUS
= 5V
R
CLPROG
= 3.01k
5x USB SETTING
500
3.0
3.3
2.7
0.10
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
0.2
0.05
0
0
0.04
0.12
0.16
0.08
FORWARD VOLTAGE (V)
0.20
40981 G01
0
2.7
3.0
3.6
3.9
3.3
BATTERY VOLTAGE (V)
3.6
3.9
4.2
40981 G03
BATTERY VOLTAGE (V)
V
OUT
Voltage vs V
OUT
Current
(Battery Charger Disabled)
4.50
BAT = 4V
4.25
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.75
V
OUT
Voltage vs V
OUT
Current
(Battery Charger Enabled)
700
Battery Charge Current vs V
OUT
Current (Battery Charger Enabled)
4.00
BAT = 3.4V
CHARGE CURRENT (mA)
3.50
450
3.25
200
3.75
3.00
3.50
V
BUS
= 5V
5x MODE
3.25
0
200
600
400
OUTPUT CURRENT (mA)
800
40981 G04
V
BUS
= 5V
BAT = 3V
R
CLPROG
= 3.01k
RPROG = 2k
5x USB SETTING
0
200
600
400
OUTPUT CURRENT (mA)
800
40981 G05
–50
V
BUS
= 5V
BAT = 3V
R
CLPROG
= 3.01k
RPROG = 2k
5x USB SETTING
0
200
600
400
OUTPUT CURRENT (mA)
800
40981 G06
2.75
–300
USB Compliant Load Current
Available Before Discharging Battery
160
150
CHARGE CURRENT (mA)
140
130
120
110 V
BUS
= 5V
R
CLPROG
= 3.01k
1x USB SETTING
100
3.0
3.3
2.7
700
600
500
400
300
USB Limited Battery Charge
Current vs Battery Voltage
150
125
CHARGE CURRENT (mA)
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 3.01k
100
75
USB Limited Battery Charge
Current vs Battery Voltage
CURRENT (mA)
V
BUS
= 5V
R
PROG
= 1k
R
CLPROG
= 3.01k
LTC4098
LTC4098
200
LTC4098-1
100
0
2.7
5x USB SETTING,
BATTERY CHARGER SET FOR 1A
3.0
3.3
3.6
3.9
4.2
40981 G08
50
LTC4098-1
25
0
1x USB SETTING,
BATTERY CHARGER SET FOR 1A
2.7
3.0
3.3
3.6
3.9
BATTERY VOLTAGE (V)
4.2
40981 G09
3.6
3.9
4.2
40981 G07
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
40981fb
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