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LTC4058 Datasheet

  • LTC4058

  • Linear Technology [Standalone Linear Li-Ion Battery Charger...

  • LINER

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LTC4058-4.2/LTC4058X-4.2
Standalone Linear
Li-Ion Battery Charger with
Thermal Regulation in DFN
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
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
鹵1%
Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
鈥淎C Present鈥?Output
2.9V Trickle Charge Threshold (LTC4058)
Available Without Trickle Charge (LTC4058X)
Soft-Start Limits Inrush Current
Low Profile (3mm
脳
3mm
脳
0.75mm) DFN Package
The LTC
廬
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 2碌A(chǔ). 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
s
s
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
1碌F
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
胃
JA
= 40擄C/W
R
PROG
= 1.65k
T
A
= 25擄C
U
4.25
4.00
3.75
3.50
3.25
U
U
1

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