LTC4062
Standalone Linear Li-Ion
Battery Charger with
Micropower Comparator
FEATURES
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DESCRIPTIO
Charge Current Programmable Up to 1A
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
Preset Float Voltage with
±
0.35% Accuracy
Micropower Comparator for Battery Monitoring
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Programmable Charge Current Detection/
Termination
Programmable Charge Termination Timer
Smart Pulsing Error Feature
SmartStart
TM
Prolongs Battery Life
20µA Charger Quiescent Current in Shutdown
Available in a Low Profile (0.75mm) 10-Lead
(3mm
×
3mm) DFN Package
The LTC
®
4062 is a full-featured, flexible, standalone linear
charger for single-cell Lithium-Ion batteries. It is capable
of operating within USB power specifications.
Both programmable time and programmable current based
termination schemes are available. Furthermore, the CHRG
open-drain status pin can be programmed to indicate the
battery charge state according to the needs of the applica-
tion. A precise low power comparator is available even
with no power applied as long as battery voltage is higher
than 2.5V. Additional safety features designed to maxi-
mize battery lifetime and reliability include the SmartStart
charging algorithm.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET architec-
ture. Internal thermal feedback regulates the charge cur-
rent to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The charge current is programmed with an external resis-
tor. With power applied, the LTC4062 can be put into
shutdown mode to reduce the supply current to 20µA and
the battery drain current to less than 5µA. Without power
applied, the internal low power comparator can work
sinking only 10µA from the battery.
Other features include smart recharge, USB C/5 current
programming input and undervoltage lockout.
APPLICATIO S
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Handheld Computers
Portable MP3 Players
Digital Cameras
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SmartStart is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118.
TYPICAL APPLICATIO
Complete Charge Cycle (1100mAh Battery)
900
800
CHARGE CURRENT (mA)
800mA Single-Cell Li-Ion Battery Charger
(C/10 Termination)
V
IN
4.3V TO 8V
V
CC
LTC4062
EN
C/5
BAT
TIMER
PROG
I
DET
IN
+
GND
100k
800mA
OUT
BAT > 3V BAT < 3V
700
600
500
400
300
200
100
V
CC
= 5V
T
A
= 25°C
0
0.5
1.5
1.0
2.0
TIME (HOURS)
2.5
BATTERY
VOLTAGE
BATTERY
CURRENT
1µF
715k
+
347k
4062 TA01
619Ω
SINGLE-CELL
Li-Ion BATTERY
0
U
4.3
4.2
4.1
BATTERY VOLTAGE (V)
U
U
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.0
4062 TA01b
4062fb
1
LTC4062
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
BAT
IN+
TIMER
OUT
CHRG
1
2
3
4
5
11
10 V
CC
9 PROG
8 I
DET
7 EN
6 C/5
Input Supply Voltage (V
CC
) ........................ –0.3V to 10V
EN, OUT, CHRG, IN
+
, PROG, C/5, BAT ....... –0.3V to 10V
TIMER, I
DET
..................................... –0.3V to V
CC
+0.3V
BAT Short-Circuit Duration ...........................Continuous
V
CC
Pin Current ......................................................... 1A
BAT Pin Current ......................................................... 1A
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 11)
MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4062EDD
DD PART MARKING
LBJT
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
CC
I
CC
PARAMETER
Input Supply Voltage
Input Supply Current
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
CONDITIONS
●
MIN
4.3
●
●
●
TYP
240
130
20
MAX
8
500
300
50
4.215
4.225
107
840
–7
±5
1.03
1.03
0.25
0.26
0.25
14
100
3
3.9
230
75
5
UNITS
V
µA
µA
µA
V
V
mA
mA
µA
µA
V
V
V
V
V
mA
mA
V
mV
V
V
mV
mV
MΩ
4062fb
Charge Mode (Note 4), R
PROG
= 10k
Standby Mode, Charge Terminated
Shutdown (EN = 5V, V
CC
< V
BAT
or V
CC
< V
UV
)
0 < T
A
< 85°C
V
FLOAT
I
BAT
V
BAT
Regulated Output Voltage
BAT Pin Current
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
Standby Mode, Charge Terminated, V
BAT
= 4.2V
Shutdown Mode, V
BAT
= 4.2V
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
I
OUT
= 5mA
I
OUT
= 5mA, V
CC
= 0V, V
BAT
= 2.55V
I
CHRG
= 5mA
V
BAT
< V
TRIKL
, R
PROG
= 10k
V
BAT
< V
TRIKL
, R
PROG
= 1.25k
V
BAT
Rising
Hysteresis
From Low to High
Hysteresis
V
CC
from Low to High, V
BAT
= 4.3V
V
CC
from High to Low, V
BAT
= 4.3V
●
●
●
●
●
4.185
4.175
93
760
4.2
4.2
100
800
–3.5
±1
1
1
0.10
0.16
0.1
V
PROG
V
OUT
V
CHRG
I
TRIKL
V
TRIKL
V
UV
V
ASD
R
EN
PROG Pin Voltage
OUT Output Low Voltage
CHRG Output Low Voltage
Trickle Charge Current
Trickle Charge Threshold Voltage
V
CC
Undervoltage Lockout
Voltage
V
CC
– V
BAT
Lockout Threshold
Voltage
EN Pin Pull-Down Resistor
0.97
0.97
6
60
2.8
3.7
145
10
2
10
80
2.9
100
3.8
200
190
45
3.4
2
U
W
U
U
W W
W
LTC4062
The
●
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
EN
V
CT
V
UT
I
DETECT
PARAMETER
EN Input Threshold Voltage
Charge Termination Mode Threshold
Voltage
User Termination Mode Threshold
Voltage
Charge Current Detection Threshold
CONDITIONS
EN Rising, 4.3V < V
CC
< 8V
Hysteresis
V
TIMER
from High to Low
Hysteresis
V
TIMER
from Low to High
Hysteresis
R
DET
= 1k, 0
≤
T
A
≤
85°C
R
DET
= 2k, 0
≤
T
A
≤
85°C
R
DET
= 10k, 0
≤
T
A
≤
85°C
R
DET
= 20k, 0
≤
T
A
≤
85°C
V
FLOAT
– V
RECHRG
, 0
≤
T
A
≤
85°C
I
BAT
from 0 to I
CHG
Current Termination Mode
C
TIMER
= 0.1µF
●
ELECTRICAL CHARACTERISTICS
MIN
0.4
0.4
3.9
90
45
8
3.8
65
0.8
3
2.55
2
0.4
TYP
0.7
70
0.7
50
4.2
50
100
50
10
5
100
100
1.5
7
3
3.4
0.7
70
105
MAX
1
1
UNITS
V
mV
V
mV
V
mV
110
55
12
6.2
135
2.5
14
3.45
5
1
mA
mA
mA
mA
mV
µs
ms
ms
hr
MΩ
V
mV
°C
mΩ
∆V
RECHRG
t
SS
t
TERM
t
RECHRG
t
TIMER
R
C/5
V
C/5
T
LIM
R
ON
Comparator
V
IN+
V
BAT-MIN
I
BAT
Recharge Threshold Voltage
Soft-Start Time
Termination Comparator Filter Time
Recharge Comparator Filter Time
Charge Cycle Time
C/5 Pin Pull-Down Resistor
C/5 Input Threshold Voltage
Junction Temperature in Constant
Temperature Mode
Power FET “ON” Resistance
(Between V
CC
and BAT)
IN
+
Pin Threshold Voltage
Minimum V
BAT
Supply Voltage for the
Low Power Comparator
Supply Current for the Low Power
Comparator
C/5 Rising, 4.3V < V
CC
< 8V
Hysteresis
V
BAT
= 3.85V, I
CC
= 175mA, R
PROG
= 2k
375
V
IN+
Falling
Hysteresis
V
CC
= 0V, V
BAT
Falling
Hysteresis
V
CC
= 0V, V
BAT
= 2.5V
●
0.988
2.4
7
1
50
2.5
100
9
1.012
2.6
13
V
mV
V
mV
µA
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 LTC4062 is 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 correctly solder the exposed pad 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 and I
DET
pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions.
Overtemperature protection will become active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
4062fb
3
LTC4062
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulated Output (Float)
Voltage vs Charge Current
4.26
4.24
4.22
V
FLOAT
(V)
V
FLOAT
(V)
V
FLOAT
(V)
V
CC
= 5V
R
PROG
= 1k
4.20
4.18
4.16
4.14
4.12
4.10
0
200
800
600
CHARGE CURRENT (mA)
400
1000
4062 G01
Charge Current vs PROG
Pin Voltage
1200
1000
800
I
BAT
(mA)
V
CC
= 5V
R
PROG
= 1k
C/5 = 5V
V
TIMER
= 5V
V
PROG
(V)
600
400
200
0
V
PROG
(V)
0
0.2
0.4
0.6
V
PROG
(V)
0.8
Trickle Charge Current vs
Temperature
84
V
CC
= 5V
V
BAT
= 2.5V
R
PROG
= 1.25k
2.96
2.94
2.92
V
TRICKLE
(V)
82
I
TRICKLE
(mA)
I
BAT
(mA)
80
78
2.86
76
–50
2.84
–50
–25
0
25
50
TEMPERATURE (°C)
4
U W
1.0
4062 G04
T
A
= 25°C unless otherwise noted.
Battery Regulated Output (Float)
Voltage vs Supply Voltage
4.26
4.24
4.22
R
PROG
= 1k
T
A
= 25°C
I
BAT
= 10mA
Battery Regulated Output (Float)
Voltage vs Temperature
4.215
4.210
4.205
4.200
4.195
4.14
4.190
4.185
–50
4.12
V
CC
= 5V
R
PROG
= 10k
4.20
4.18
4.16
–25
0
25
50
TEMPERATURE (°C)
75
100
4062 G02
4.10
4.0 4.5
5.0 5.5
6.0 6.5
V
CC
(V)
7.0 7.5
8.0
4062 G03
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
1.006
1.004
1.002
V
CC
= 8V
1.000
V
CC
= 4.3V
0.998
0.996
0.994
–50
R
PROG
= 10k
C/5 = V
CC
1.006
1.004
1.002
1.000
0.998
0.996
PROG Pin Voltage vs V
CC
(Constant-Current Mode)
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
C/5 = 5V
1.2
–25
0
25
50
TEMPERATURE (°C)
75
100
4062 G05
0.994
4.0
4.5 5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
4062 G06
Trickle Charge Threshold Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 1.25k
550
Charge Current vs Battery Voltage
C/5 = 5V
450
350
2.90
2.88
250
V
CC
= 5V
R
PROG
= 2k
150
C/5 = 0V
50
3.2
3.0
75
100
4062 G07
–25
0
25
50
TEMPERATURE (°C)
75
100
4062 G08
3.6
3.4
V
BAT
(V)
3.8
4.0
4062 G09
4062fb
LTC4062
TYPICAL PERFOR A CE CHARACTERISTICS
Internal Charge Timer vs
Temperature
195
190
t
TIMER
(MINUTES)
V
CC
= 4.3V
V
CC
= 8V
185
I
BAT
(mA)
180
175
170
165
–50
C
TIMER
= 0.1µF
–25
0
25
50
TEMPERATURE (°C)
75
100
4062 G10
R
PROG
= 2k
I
BAT
(mA)
Recharge Threshold Voltage vs
Temperature
4.16
4.14
4.12
V
CC
= 8V
V
CC
= 4.3V
4.10
4.08
4.06
4.04
–50
300
500
V
RECHARGE
(V)
R
DS(ON)
(mΩ)
V
UV
(V)
–25
0
25
50
TEMPERATURE (°C)
Charge Current vs Battery Voltage
900
800
700
600
I
BAT
(mA)
V
CC
= 5V
C/5 = 5V
R
PROG
= 1.25k
θ
JA
= 40°C/W
R
EN
(MΩ)
500
400
300
200
3.5
3.0
2.5
R
C/5
(MΩ)
100
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
4062 G18
U W
75
T
A
= 25°C unless otherwise noted.
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
800
R
PROG
= 1.25k
102
104
Charge Current vs Supply Voltage
V
CC
= 5V
V
BAT
= 4V
C/5 = 5V
R
PROG
= 10k
600
100
400
200
98
V
CC
= 5V
V
BAT
= 4V
θ
JA
= 40°C/W
–25
50
25
0
75
TEMPERATURE (°C)
100
125
0
–50
96
4.0
4.5
5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
4062 G13
4062 G14
Power FET “ON” Resistance vs
Temperature
V
CC
= 4V
I
BAT
= 200mA
450
3.850
400
3.825
3.800
3.775
3.750
3.725
100
250
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4062 G16
Undervoltage Lockout Voltage vs
Temperature
3.900
3.875
350
3.700
– 50
–25
50
25
0
TEMPERATURE (°C)
75
100
4062 G17
4062 G15
EN Pin Pulldown Resistance vs
Temperature
5.0
4.5
4.0
5.0
4.5
4.0
3.5
3.0
2.5
C/5 Pin Pulldown Resistance vs
Temperature
2.0
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4062 G19
2.0
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4062 G20
4062fb
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