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LTC4068EDD-4.2#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC4068-4.2/LTC4068X-4.2
406842fa
Standalone Linear
Li-Ion Battery Charger with
Programmable Termination
■
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*
■
Charges Directly from a USB Port
■
Programmable Charge Current 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 (LTC4068)
■
Available Without Trickle Charge (LTC4068X)
■
Soft-Start Limits Inrush Current
■
Low Profile (3mm × 3mm × 0.75mm) DFN Package
■
Cellular Telephones, PDAs, MP3 Players
■
Bluetooth Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®
4068 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 LTC4068 ideally suited for portable applications. Fur-
thermore, the LTC4068 is designed to work within USB
power specifications.
No external sense resistor or external blocking diode are
required due to the internal MOSFET architecture. Thermal
feedback regulates the charge current to limit the die
temperature during high power operation or high ambient
temperature conditions. The charge voltage is fixed at
4.2V and the charge current is programmed with a resis-
tor. The LTC4068 terminates the charge cycle when the
charge current drops below the programmed termination
threshold after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC4068 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 adequate input voltage.
BATV
CC
CHRG
1.65k
406842 TA01
1µF
V
IN
4.5V TO 6.5V
1-CELL
Li-Ion
BATTERY
LTC4068-4.2
600mA
ACPR
EN PROG
GND
+
ITERM
825Ω
TIME (HOURS)
0
CHARGE CURRENT (mA)
1.5
406842 TA02
0.5 1.0 2.25
700
600
500
400
300
200
100
0
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
0.25 0.75 1.25 2.01.75
CONSTANT
VOLTAGE
CONSTANT
CURRENT
BATTERY VOLTAGE (V)
V
CC
= 5V
θ
JA
= 40°C/W
R
PROG
= 1.65k
R
TERM
= 825Ω
T
A
= 25°C
Complete Charge Cycle (750mAh Battery)
Protected by U.S. Patents, including 6522118.
Single Cell Li-Ion Battery Charger with C/5 Termination
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC4068-4.2/LTC4068X-4.2
406842fa
(Note 1)
Input Supply Voltage (V
CC
) ....................... –0.3V to 10V
PROG, ITERM ................................ – 0.3V to V
CC
+ 0.3V
BAT ............................................................. –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
T
JMAX
= 125°C, θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 9)
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
DD PART MARKING
LBHZ
LBQB
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Voltage ● 4.25 6.5 V
I
CC
Input Supply Current Charge Mode (Note 4), R
PROG
= 10k ● 0.4 1 mA
Standby Mode (Charge Terminated)
● 200 500 µA
Shutdown Mode (EN = 5V, V
CC
< V
BAT
● 25 50 µA
or V
CC
< V
UV
)
V
FLOAT
Regulated Output (Float) Voltage 0°C ≤ T
A
≤ 85°C, 4.3V < V
CC
< 6.5V 4.158 4.2 4.242 V
I
BAT
BAT Pin Current R
PROG
= 10k, Current Mode ● 92 100 105 mA
R
PROG
= 2k, Current Mode ● 465 500 535 mA
Standby Mode, V
BAT
= 4.2V ● –2.5 –6 µA
Shutdown Mode (EN = 5V, V
CC
< V
BAT
or ±1 ±2 µA
V
CC
< V
UV
)
Sleep Mode, V
CC
= 0V ±1 ±2 µA
I
TRIKL
Trickle Charge Current V
BAT
< V
TRIKL
, R
PROG
= 2k (Note 5) ● 30 45 60 mA
V
TRIKL
Trickle Charge Threshold Voltage R
PROG
= 10k, V
BAT
Rising (Note 5) 2.8 2.9 3 V
V
TRHYS
Trickle Charge Hysteresis Voltage R
PROG
= 10k (Note 5) 80 mV
V
UV
V
CC
Undervoltage Lockout Voltage From V
CC
Low to High ● 3.7 3.8 3.92 V
V
UVHYS
V
CC
Undervoltage Lockout Hysteresis ● 150 200 300 mV
V
EN(IL)
EN Pin Input Low Voltage ● 0.4 0.7 V
V
EN(IH)
EN Pin Input High Voltage ● 0.7 1 V
R
EN
EN Pin Pull-Down Resistor ● 1.2 2 5 MΩ
V
ASD
V
CC
– V
BAT
Lockout Threshold V
CC
from Low to High 70 100 140 mV
V
CC
from High to Low 5 30 50 mV
I
TERM
Charge Termination Current Threshold R
TERM
= 1k ● 90 100 110 mA
R
TERM
= 5k ● 17.5 20 22.5 mA
V
PROG
PROG Pin Voltage R
PROG
= 10k, Current Mode 0.93 1 1.07 V
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.35 0.6 V
V
ACPR
ACPR Pin Output Low Voltage I
ACPR
= 5mA 0.35 0.6 V
∆V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
, 0°C ≤ T
A
≤ 85°C 60 100 140 mV
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.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC4068EDD-4.2
LTC4068XEDD-4.2
TOP VIEW
9
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1ITERM
BAT
CHRG
GND
EN
ACPR
V
CC
PROG
3
LTC4068-4.2/LTC4068X-4.2
406842fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC4068E-4.2/LTC4068XE-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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
T
LIM
Junction Temperature in Constant 120 °C
Temperature Mode
R
ON
Power FET “ON” Resistance 600 mΩ
(Between V
CC
and BAT)
t
SS
Soft-Start Time I
BAT
= 0 to I
BAT
=1000V/R
PROG
100 µs
t
RECHARGE
Recharge Comparator Filter Time V
BAT
High to Low 0.75 2 4.5 ms
t
TERM
Termination Comparator Filter Time I
BAT
Drops Below Charge Termination Threshold 400 1000 2500 µs
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.
ELECTRICAL CHARACTERISTICS
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 and ITERM pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5: This parameter is not applicable to the LTC4068X.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
PROG Pin Voltage vs Supply
Voltage (Constant Current Mode)
V
CC
(V)
4
0.985
V
PROG
(V)
0.990
0.995
1.000
1.005
1.015
4.5
5 5.5 6
405842 G01
6.5 7
1.010
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
R
PROG
= 10k
TEMPERATURE (°C)
–50
V
PROG
(V)
0.9975
1.0000
1.0025
25
75
405842 G02
0.9950
0.9925
0.9900
–25 0 50
1.0050
1.0075
1.0100
100
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
V
PROG
(V)
0
0
I
BAT
(mA)
100
200
300
400
600
0.2
0.4 0.6 0.8
405842 G03
1 1.2
500
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
R
TERM
= 2k
PROG Pin Voltage
vs Temperature
Charge Current
vs PROG Pin Voltage
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LTC4068EDD-4.2#PBF

Mfr. #:
Buy LTC4068EDD-4.2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Standalone Li-Ion Battery Charger in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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