LTC4095
Standalone USB
Li-Ion/Polymer Battery
Charger in 2mm
×
2mm DFN
FEATURES
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DESCRIPTION
The LTC
®
4095 is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion/polymer
batteries. Its small 2mm
×
2mm DFN package and low
external component count make the LTC4095 especially
well-suited for portable USB power applications.
Up to 950mA of charge current may be programmed via a
single resistor from the PROG pin to ground. The HPWR
pin allows the charge current to be set at 20% or 100% of
its full-scale programmed value. An internal safety timer
terminates charge current. The final float voltage is preset
to 4.2V and held to a tight 0.5% tolerance. Also featured
is an NTC thermistor input to monitor battery temperature
while charging, a C/10 current detection output, automatic
recharge, bad-battery detection and low-battery trickle
charge. A thermal feedback loop regulates the charge
current to limit the die temperature during high power
operation or high ambient thermal conditions.
The LTC4095 is available in a tiny, low profile (0.75mm)
8-lead 2mm
×
2mm DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6570372, 6700364.
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Full-Featured Standalone USB Li-Ion/Polymer
Battery Charger
100mA to 950mA Programmable Charge Current
C/10 Charge Current Detection Output
Internal Safety Timer Termination
NTC Thermistor Input for Temperature Qualified
Charging
Preset 4.2V Float Voltage with 0.5% Accuracy
Constant-Current/Constant-Voltage Operation with
Thermal Feedback
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Bad-Battery Detection
8.5µA Input Supply Current in Suspend Mode
Tiny 8-Lead (2mm
×
2mm) DFN Package
APPLICATIONS
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PDAs
Media Players
Cellular Phones
Other Portable Electronics
TYPICAL APPLICATION
500mA Single-Cell Li-Ion Charger
IN
4.3V TO 5.5V
UP TO 7V
TRANSIENTS
C
IN
1µF
IN
BAT
LTC4095
HPWR CHRG
SUSP
GND
NTC
PROG
R
PROG
1.74k
4095 TA01a
+
Li-Ion
BATTERY
4095fa
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LTC4095
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
PACKAGE/ORDER INFORMATION
TOP VIEW
BAT 1
GND 2
CHRG 3
SUSP 4
9
8 IN
7 PROG
6 NTC
5 HPWR
Input Supply Voltage (IN)
t < 1ms and Duty Cycle < 1% .................. –0.3V to 7V
Steady State............................................. –0.3V to 6V
BAT, SUSP,
⎯
C
⎯
H
⎯
R
⎯
G Voltage ............................ –0.3V to 6V
PROG, NTC, HPWR
Voltage ............................ –0.3V to Max (IN, BAT) + 0.3V
I
BAT
.............................................................................1A
I
PROG
...................................................................1.25mA
I
⎯
C
⎯
H
⎯
R
⎯
G
......................................................................50mA
Junction Temperature ........................................... 125°C
Operating Temperature Range ................. –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 60°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4095EDC
DC PART MARKING
LCLG
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
IN
I
IN
V
FLOAT
I
CHG
I
BAT
PARAMETER
Input Supply Voltage
Battery Charger Quiescent Current
(Note 4)
BAT Regulated Output Voltage
Battery Charger
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. IN = HPWR = 5V, BAT = 3.8V, NTC = SUSP = 0V, R
PROG
= 1.74k unless
otherwise specified.
CONDITIONS
●
MIN
4.3
TYP
MAX
5.5
UNITS
V
µA
µA
V
V
mA
mA
µA
µA
µA
V
mV
mV
mV
V
V
V
mA/mA
Standby Mode; Charger Terminated
Suspend Mode; SUSP = 5V
0°C ≤ T
A
≤ 85°C
4.179
4.165
●
200
8.5
4.200
4.200
460
92
–3.5
–2.0
–1.3
3.875
25
4.0
200
40
125
1.000
0.200
0.100
800
37
2.8
–75
46
2.9
100
–95
400
17
4.221
4.235
500
100
–7
–4
–3
4.125
60
Constant-Current Mode Charge Current
Battery Drain Current
HPWR = 5V
HPWR = 0V
Standby Mode; Charger Terminated
Shutdown Mode; IN < V
UVLO
, BAT = 4.2V
Suspend Mode; SUSP = 5V, BAT = 4.2V
BAT = 3.5V, IN Rising
BAT = 3.5V
BAT = 4.05V, (IN – BAT), IN Falling
BAT = 4.05V
HPWR = 5V
HPWR = 0V
BAT < V
TRKL
BAT < V
TRKL
BAT Rising
Threshold Voltage Relative to V
FLOAT
440
84
V
UVLO
ΔV
UVLO
V
DUVLO
ΔV
DUVLO
PROG
Undervoltage Lockout Threshold
Undervoltage Lockout Hystersis
Differential Undervoltage Lockout
Threshold
Differential Undervoltage Lockout
Hysteresis
PROG Pin Servo Voltage
h
PROG
I
TRKL
V
TRKL
ΔV
TRKL
ΔV
RECHRG
Ratio of I
BAT
to PROG Pin Current
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage
55
3.0
–115
mA
V
mV
mV
4095fa
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LTC4095
ELECTRICAL CHARACTERISTICS
SYMBOL
t
RECHRG
t
TERM
t
BADBAT
h
C/10
t
C/10
R
ON_CHG
T
LIM
NTC
V
COLD
V
HOT
V
DIS
I
NTC
V
IL
V
IH
R
DN
⎯ ⎯
CH
⎯
R
⎯
G
I
⎯
C
⎯
H
⎯
R
⎯
G
Cold Temperature Fault Threshold
Voltage
Hot Temperature Fault Threshold
Voltage
NTC Disable Threshold Voltage
Rising NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
NTC = IN = 5V
HPWR, SUSP Pins
HPWR, SUSP Pins
HPWR, SUSP Pins
I
⎯
C
⎯
H
⎯
R
⎯
G
= 5mA
⎯
BAT = 4.5V, C
⎯
H
⎯
R
⎯
G = 5V
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. IN = HPWR = 5V, BAT = 3.8V, NTC = SUSP = 0V, R
PROG
= 1.74k unless
otherwise specified.
PARAMETER
Recharge Comparator Filter Time
Safety Timer Termination Period
Bad-Battery Termination Time
End of Charge Indication Current Level
End of Charge Comparator Filter Time
Battery Charger Power FET On-
Resistance (Between IN and BAT)
Junction Temperature in Constant
Temperature
CONDITIONS
BAT Falling
BAT = V
FLOAT
BAT < V
TRKL
(Note 5)
I
BAT
Falling
I
BAT
= 200mA
3.5
0.4375
0.09
MIN
TYP
1.7
4
0.5
0.1
2.2
500
115
4.5
0.5625
0.11
MAX
UNITS
ms
Hour
Hour
mA/mA
ms
mΩ
°C
0.750 • IN 0.765 • IN 0.780 • IN
0.016 • IN
0.334 • IN 0.349 • IN 0.364 • IN
0.016 • IN
0.007 • IN 0.017 • IN 0.027 • IN
0.010 • IN
–1
0
1
0.4
1.2
1.9
3.6
100
0
6.3
250
1
V
V
V
V
mV
mV
µA
V
V
MΩ
mV
µA
NTC Leakage Current
⎯ ⎯ ⎯ ⎯
Logic (HPWR, SUSP, CHRG)
Input Low Voltage
Input High Voltage
Logic Pin Pull-Down Resistance
⎯
CHRG Pin Output Low Voltage
⎯ ⎯ ⎯
⎯
C
⎯
H
⎯
R
⎯
G Pin Input Current
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 LTC4095 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:
This IC 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:
IN supply current does not include current through the PROG pin
or any current delivered to the battery through the BAT pin. Total input
current is equal to this specification plus 1.00125 • I
BAT
where I
BAT
is the
charge current.
Note 5:
h
C/10
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
4095fa
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LTC4095
TYPICAL PERFORMANCE CHARACTERISTICS
Battery Regulation (Float)
Voltage vs Battery Charge Current
4.25
IN = 5V
4.24 R
PROG
= 0.845k
HPWR = 5V
4.23
4.22
V
BAT
(V)
V
BAT
(V)
4.21
4.20
4.19
4.18
4.17
4.16
4.15
0
200
600
400
I
BAT
(mA)
800
1000
4095 G01
T
A
= 25°C, unless otherwise noted.
Charge Current vs Supply Voltage
(Constant Current Mode)
500
490
480
I
BAT
(mA)
470
460
450
440
4.3
4.5
4.7
4.9
IN (V)
5.1
5.3
5.5
4095 G03
Battery Regulation (Float)
Voltage vs Temperature
4.215
4.210
4.205
4.200
4.195
4.190
4.185
–55
IN = 5V
R
PROG
= 1.74k
HPWR = 5V
–35
–15
25
45
5
TEMPERATURE (°C)
65
85
4095 G02
Charge Current vs Battery Voltage
600
500
400
I
BAT
(mA)
300
200
100
0
2
2.5
3
3.5
BAT (V)
4
4.5
2400 G31
Charge Current vs Ambient
Temperature with Thermal
Regulation
500
450
400
1000
800
600
400
200
0
5.0
4.5
4.0
3.5
3.0
5.0
4.0
3.0
2.0
1.0
0
I
BAT
(mA)
Complete Charge Cycle
(2400mAh Battery)
IN = 5V
R
PROG
= 0.845k
HPWR = 5V
IN = 5V
R
PROG
= 1.74k
HPWR = 5V
I
BAT
(mA)
350
BAT (V)
CHRG (V)
300
250
200
150
IN = 5V
BAT = 3.8V
50 R
PROG
= 1.74k
HPWR = 5V
0
–50 –25 0
25 50 75 100 125 150
TEMPERATURE (°C)
4095 G05
HPWR = 0V
100
0
1
2
4
3
TIME (HOUR)
5
6
4095 G18
PROG Pin Voltage vs Charge
Current
1.0
IN = 5V
R
PROG
= 1.74k
HPWR = 5V
2.0
PROG Pin Voltage vs PROG Pin
Resistance (Constant Current Mode)
IN = 5V
BAT = 3.8V
HPWR = 5V
700
Power FET On-Resistance vs
Temperature
IN = 4V
I
BAT
= 200mA
0.8
1.5
PROG (V)
R
ON
(mΩ)
PROG (V)
0.6
600
1.0
500
0.4
0.2
0.5
400
0
0
100
300
200
I
BAT
(mA)
400
500
4095 G06
0
1
2
3
4
6
7
R
PROG
(kΩ)
5
8
9
10
300
–55 –35
25
5
45
–15
TEMPERATURE (°C)
65
85
4095 G07
" '# / &
4095fa
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LTC4095
TYPICAL PERFORMANCE CHARACTERISTICS
Recharge Threshold vs
Temperature
115
4.2
4.1
UVLO THRESHOLD (V)
105
∆V
RECHARGE
(mV)
THRESHOLD VOLTAGE (V)
RISING
4.0
3.9
FALLING
3.8
3.7
3.6
75
–55
3.5
–55 –35
T
A
= 25°C, unless otherwise noted.
SUSP/HPWR Pins Rising Threshold
Voltage vs Temperature
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
Undervoltage Lockout Threshold
vs Temperature
BAT = 3.5V
95
85
–35
25
5
–15
45
TEMPERATURE (°C)
65
85
25
5
45
–15
TEMPERATURE (°C)
65
85
0.4
–55
–35
–15
25
45
5
TEMPERATURE (°C)
65
85
4095 G11
4095 G09
4095 G10
Supply Currents in Suspend vs
Temperature
12
10
SUPPLY CURRENT (µA)
I
IN
8
I
BAT
(µA)
6
4
2
0
–55 –35
I
BAT
2.0
IN = 5V
BAT = 4.2V
2.5
Battery Drain Current in UVLO vs
Temperature
IN = 0V
BAT = 4.2V
70
60
50
I
CHRG
(mA)
40
30
20
10
1.0
–55
0
–35
45
–15
5
25
TEMPERATURE (°C)
65
85
⎯
CH
⎯
R
⎯
G Pin I-V Curve
⎯
IN = 5V
BAT = 3.8V
BAT = 3.6V
1.5
25
45
5
–15
TEMPERATURE (°C)
65
85
0
1
2
3
CHRG (V)
4
5
6
4095 G14
4095 G12
4095 G13
⎯
CH
⎯
R
⎯
G Pin Output Low Voltage vs
⎯
Temperature
140
120
100
CHRG (mV)
80
60
40
20
0
–55 –35
7
IN = 5V
I
CHRG
= 5mA
PERCENT ERROR (%)
6
5
4
3
2
1
0
–1
25
5
45
–15
TEMPERATURE (°C)
65
85
Timer Period Accuracy vs
Temperature
1.2
1.0
0.8
PERCENT ERROR (%)
–35
–15
5
25
45
TEMPERATURE (°C)
65
85
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
Timer Period Accuracy vs Supply
Voltage
–2
–55
4.3
4.5
4.7
4.9
IN (V)
5.1
5.3
5.5
4095 G15
4095 G16
4095 G17
4095fa
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