LTC4058-4.2/LTC4058X-4.2
Standalone Linear
Li-Ion Battery Charger with
Thermal Regulation in DFN
FEATURES
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DESCRIPTIO
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Programmable Charge Current Up to 950mA
Complete Linear Charger in DFN Package
No MOSFET, Sense Resistor or Blocking Diode
Required
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
Battery Kelvin Sensing Improves Charging Accuracy
Charges Directly from a USB Port
C/10 Charge Termination
Preset 4.2V Charge Voltage with
±1%
Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
“AC Present” Output
2.9V Trickle Charge Threshold (LTC4058)
Available Without Trickle Charge (LTC4058X)
Soft-Start Limits Inrush Current
Low Profile (3mm
×
3mm
×
0.75mm) DFN Package
The LTC
®
4058 is a complete constant-current/constant-
voltage linear charger for single cell lithium-ion batteries.
Its DFN package and low external component count make
the LTC4058 ideally suited for portable applications. Fur-
thermore, the LTC4058 is designed to work within USB
power specifications.
The LTC4058 can Kelvin sense the battery terminal for
more accurate float voltage charging. No external sense
resistor or external blocking diode are required due to the
internal MOSFET architecture. Thermal feedback regu-
lates the charge current to limit the die temperature during
high power operation or high ambient temperature condi-
tions. The charge voltage is fixed at 4.2V and the charge
current is programmed with a resistor. The LTC4058
terminates the charge cycle when the charge current
drops to 10% of the programmed value after the final float
voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC4058 enters a low current state dropping
the battery drain current to less than 2µA. Other features
include charge current monitor, undervoltage lockout,
automatic recharge and status pins to indicate charge
termination and the presence of an input voltage.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent 6,522,118
APPLICATIO S
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Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications
TYPICAL APPLICATIO
Complete Charge Cycle (750mAh Battery)
700
CONSTANT
CURRENT
CONSTANT
VOLTAGE
4.75
4.50
BATTERY VOLTAGE (V)
Single Cell Li-Ion Battery Charger with Kelvin Sense
CHARGE CURRENT (mA)
600mA
V
IN
4.5V TO 6.5V
V
CC
BAT
BSENSE
LTC4058-4.2
CHRG
ACPR
EN
PROG
GND
600
500
400
300
200
100
+
1-CELL
Li-Ion
BATTERY
1µF
1.65k
405842 TA01
0
3.00
0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25
405842 TA02
TIME (HOURS)
sn405842 405842fs
V
CC
= 5V
θ
JA
= 40°C/W
R
PROG
= 1.65k
T
A
= 25°C
U
4.25
4.00
3.75
3.50
3.25
U
U
1
LTC4058-4.2/LTC4058X-4.2
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
BSENSE 1
BAT 2
CHRG 3
GND 4
9
8
7
6
5
EN
ACPR
V
CC
PROG
Input Supply Voltage (V
CC
) ....................... –0.3V to 10V
PROG ............................................. – 0.3V to V
CC
+ 0.3V
BAT, BSENSE .............................................. –0.3V to 7V
CHRG, ACPR, EN ...................................... –0.3V to 10V
BAT Short-Circuit Duration .......................... Continuous
BAT Pin Current ........................................................ 1A
PROG Pin Current ................................................... 1mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
ORDER PART
NUMBER
LTC4058EDD-4.2
LTC4058XEDD-4.2
DD PART MARKING
LAEV
LBDH
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 9)
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
SYMBOL
V
CC
I
CC
PARAMETER
Input Supply Voltage
Input Supply Current
Charge Mode (Note 4), R
PROG
= 10k
Standby Mode (Charge Terminated)
Shutdown Mode (EN = 5V, V
CC
< V
BSENSE
or V
CC
< V
UV
)
0°C
≤
T
A
≤
85°C, 4.3V < V
CC
< 6.5V
R
PROG
= 10k, Current Mode
R
PROG
= 2k, Current Mode
Standby Mode, V
BSENSE
= 4.2V
Shutdown Mode (EN = 5V, V
CC
< V
BSENSE
or
V
CC
< V
UV
)
Sleep Mode, V
CC
= 0V
V
BSENSE
< V
TRIKL
, R
PROG
= 2k (Note 6)
R
PROG
= 10k, V
BSENSE
Rising (Note 6)
R
PROG
= 10k (Note 6)
From V
CC
Low to High
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
q
q
q
q
MIN
4.25
TYP
0.3
200
25
MAX
6.5
1
500
50
4.242
107
535
–6
±2
±2
60
3
110
3.92
300
1
5
140
50
0.115
0.115
1.07
0.6
0.6
140
UNITS
V
mA
µA
µA
V
mA
mA
µA
µA
µA
mA
V
mV
V
mV
V
V
MΩ
mV
mV
mA/mA
mA/mA
V
V
V
mV
V
FLOAT
I
BAT
I
BSENSE
Regulated Output (Float) Voltage
BAT Pin Current
BSENSE Pin Current (Note 5)
4.158
93
465
4.2
100
500
–2.5
±1
±1
I
TRIKL
V
TRIKL
V
TRHYS
V
UV
V
UVHYS
V
EN(IL)
V
EN(IH)
R
EN
V
ASD
I
TERM
V
PROG
V
CHRG
V
ACPR
∆V
RECHRG
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
V
CC
Undervoltage Lockout Voltage
V
CC
Undervoltage Lockout Hysteresis
EN Pin Input Low Voltage
EN Pin Input High Voltage
EN Pin Pull-Down Resistor
V
CC
– V
BSENSE
Lockout Threshold
C/10 Termination Current Threshold
PROG Pin Voltage
CHRG Pin Output Low Voltage
ACPR Pin Output Low Voltage
Recharge Battery Threshold Voltage
q
30
2.8
60
3.7
150
0.4
1.2
70
5
45
2.9
80
3.8
200
0.7
0.7
2
100
30
0.10
0.10
1
0.35
0.35
V
CC
from Low to High
V
CC
from High to Low
R
PROG
= 10k (I
CHG
= 100mA) (Note 7)
R
PROG
= 2k (I
CHG
= 500mA)
R
PROG
= 10k, Current Mode
I
CHRG
= 5mA
I
ACPR
= 5mA
V
FLOAT
– V
RECHRG
, 0°C
≤
T
A
≤
85°C
q
q
0.085
0.085
0.93
60
100
sn405842 405842fs
2
U
W
U
U
W W
W
LTC4058-4.2/LTC4058X-4.2
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
SYMBOL
T
LIM
R
ON
t
SS
t
RECHARGE
t
TERM
PARAMETER
Junction Temperature in Constant
Temperature Mode
Power FET “ON” Resistance
(Between V
CC
and BAT)
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
I
BAT
= 0 to I
BAT
=1000V/R
PROG
V
BSENSE
High to Low
I
BAT
Drops Below I
CHG
/10
0.75
400
CONDITIONS
MIN
TYP
120
600
100
2
1000
4.5
2500
MAX
UNITS
°C
mΩ
µs
ms
µs
ELECTRICAL CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The LTC4058E-4.2/LTC4058XE-4.2 are guaranteed to meet
performance specifications from 0°C to 70°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:
Failure to solder the exposed backside of the package to the PC
board will result in a thermal resistance much higher than 40°C/W.
Note 4:
Supply current includes PROG pin current (approximately 100µA)
but does not include any current delivered to the battery through the BAT
pin (approximately 100mA).
Note 5:
For all Li-Ion applications, the BSENSE pin must be electrically
connected to the BAT pin.
Note 6:
This parameter is not applicable to the LTC4058X.
Note 7:
I
TERM
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
TYPICAL PERFOR A CE CHARACTERISTICS
PROG Pin Voltage vs Supply
Voltage (Constant Current Mode)
1.015
1.010
1.005
V
CC
= 5V
V
BAT
= V
BSENSE
= 4V
T
A
= 25°C
R
PROG
= 10k
V
PROG
(V)
V
PROG
(V)
1.000
0.995
1.0000
0.9975
0.9950
I
BAT
(mA)
0.990
0.985
4
4.5
5
5.5
V
CC
(V)
6
U W
6.5
7
405842 G01
PROG Pin Voltage
vs Temperature
1.0100
1.0075
1.0050
1.0025
400
300
200
100
0
Charge Current
vs PROG Pin Voltage
600
500
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
V
CC
= 5V
V
BAT
= V
BSENSE
= 4V
R
PROG
= 10k
0.9925
0.9900
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
0
0.2
0.4
0.6
0.8
V
PROG
(V)
1
1.2
405842 G02
405842 G03
sn405842 405842fs
3
LTC4058-4.2/LTC4058X-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Regulated Output (Float) Voltage
vs Charge Current
4.26
V
CC
= 5V
T
A
= 25°C
4.24
R
PROG
= 1.25k
4.22
V
FLOAT
(V)
V
FLOAT
(V)
4.215
4.210
4.205
4.200
4.195
4.190
4.185
–50
4.18
4.16
4.14
4.12
4.10
0
100
200
300 400
I
BAT
(mA)
500
600
700
V
FLOAT
(V)
4.20
CHRG Pin I-V Curve
(Pull-Down State)
30
T
A
= –40°C
25
20
T
A
= 25°C
30
I
CHRG
(mA)
I
ACPR
(mA)
15
10
5
0
0
1
2
4
3
V
CHRG
(V)
5
6
7
15
10
5
0
0
1
2
4
3
V
ACPR
(V)
5
6
7
I
TRKL
(mA)
T
A
= 90°C
V
CC
= 5V
V
BAT
= V
BSENSE
= 4V
Trickle Charge Current
vs Supply Voltage
60
50
R
PROG
= 2k
40
I
TRKL
(mA)
V
TRKL
(V)
30
20
10
0
R
PROG
= 10k
V
BAT
= V
BSENSE
= 2.5V
T
A
= 25°C
3.000
2.975
2.950
2.900
2.875
2.850
2.825
I
BAT
(mA)
4
4.5
5
5.5
V
CC
(V)
6
4
U W
405842 G04
405842 G07
Regulated Output (Float) Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 10k
4.215
4.210
4.205
4.200
4.195
4.190
4.185
Regulated Output (Float) Voltage
vs Supply Voltage
T
A
= 25°C
R
PROG
= 10k
–25
0
25
50
TEMPERATURE (°C)
75
100
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
405842 G05
405842 G06
ACPR Pin I-V Curve
(Pull-Down State)
60
T
A
= –40°C
25
20
T
A
= 25°C
Trickle Charge Current
vs Temperature
V
CC
= 5V
V
BAT
= V
BSENSE
= 2.5V
R
PROG
= 2k
T
A
= 90°C
50
40
30
20
10
0
–50
R
PROG
= 10k
V
CC
= 5V
V
BAT
= V
BSENSE
= 4V
–25
0
25
50
TEMPERATURE (°C)
75
100
405842 G08
405842 G09
Trickle Charge Threshold Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 10k
600
500
400
300
200
100
Charge Current vs Battery Voltage
2.925
6.5
7
2.800
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
0
2.4
V
CC
= 5V
θ
JA
= 40°C/W
R
PROG
= 2k
2.7
3
3.3 3.6
V
BAT
(V)
3.9
4.2
4.5
405842 G10
405842 G11
405842 G08
sn405842 405842fs
LTC4058-4.2/LTC4058X-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Supply Voltage
600
500
400
I
BAT
(mA)
R
PROG
= 2k
500
300
200
100
0
V
BAT
= V
BSENSE
= 4V
T
A
= 25°C
θ
JA
= 40°C/W
300
200
V
CC
= 5V
V
BAT
= V
BSENSE
= 4V
θ
JA
= 40°C/W
V
RECHRG
(V)
I
BAT
(mA)
R
PROG
= 10k
4
4.5
5
5.5
V
CC
(V)
6
Power FET Transistor Curve
800
700
600
800
V
CC
= 5V
V
BSENSE
= 3.5V
T
A
= 25°C
R
PROG
= 2k
R
DS(ON)
(mΩ)
I
BAT
(mA)
500
400
300
200
100
0
3.8
4.1
4.4
4.7
V
BAT
(V)
5
5.3
405842 G16
PI FU CTIO S
BSENSE (Pin 1):
Battery Sense. This pin is used to Kelvin
sense the positive battery terminal and regulate the final
float voltage to 4.2V. An internal precision resistor divider
sets this float voltage and is disconnected in shutdown
mode.
For Li-Ion applications, this pin must be electri-
cally connected to BAT.
BAT (Pin 2):
Charge Current Output. Provides charge
current to the battery from the internal P-channel MOSFET.
CHRG (Pin 3):
Charge Status Open-Drain Output. When
the battery is charging, the CHRG pin is pulled low by an
internal N-channel MOSFET. When the charge cycle is
completed, CHRG becomes high impedance.
GND (Pins 4, 9):
Ground/Exposed Pad. The exposed
backside of the package (Pin 9) is also ground and must
be soldered to the PC board for maximum heat transfer.
PROG (Pin 5):
Charge Current Program and Charge Cur-
rent Monitor. Charge current is programmed by connect-
ing a 1% resistor, R
PROG
, to ground. When charging in
constant-current mode, this pin servos to 1V. In all modes,
sn405842 405842fs
U W
6.5
7
405842 G13
Charge Current
vs Ambient Temperature
600
ONSET OF THERMAL REGULATION
Recharge Threshold Voltage
vs Temperature
4.16
4.14
V
CC
= 5V
R
PROG
= 10k
R
PROG
= 2k
400
4.12
4.10
4.08
R
PROG
= 10k
100
0
–50
4.06
4.04
–50
–25
50
25
75
0
TEMPERATURE (°C)
100
125
–25
0
25
50
TEMPERATURE (°C)
75
100
405842 G14
405842 G15
Power FET “ON” Resistance
vs Temperature
V
CC
= 5V
V
BAT
= 4.8V
= 4V
V
700 R
BSENSE
2k
=
PROG
600
500
400
300
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
405842 G17
U
U
U
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