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PDF LTC4068-4.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4068-4.2 | |
| Descripción | Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 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
U
APPLICATIO S
■ Cellular Telephones, PDAs, MP3 Players
■ Bluetooth Applications
LTC4068-4.2/LwTwCw.D4a0taS6he8etX4U.-c4om.2
Standalone Linear
Li-Ion Battery Charger with
Programmable Termination
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, including 6522118.
TYPICAL APPLICATIO
Single Cell Li-Ion Battery Charger with C/5 Termination
VIN
4.5V TO 6.5V
VCC BAT
LTC4068-4.2
600mA
CHRG
+ 1-CELL
ACPR ITERM
Li-Ion
BATTERY
EN PROG
825Ω
1µF GND 1.65k
406842 TA01
Complete Charge Cycle (750mAh Battery)
700
CONSTANT
CURRENT
600
500
4.75
CONSTANT
VOLTAGE
4.50
4.25
400 4.00
300 3.75
200 VCC = 5V
3.50
θJA = 40°C/W
100 RPROG = 1.65k
3.25
RTERM = 825Ω
0 TA = 25°C
3.00
0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25
TIME (HOURS)
406842 TA02
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1 page  
LTC4068-4.2/LwTwCw.D4a0taS6he8etX4U.-c4om.2
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Supply Voltage
600
RPROG = 2k
500
400
VBAT = 4V
300 TA = 25°C
θJA = 40°C/W
200
RPROG = 10k
100
0
4 4.5 5 5.5 6
VCC (V)
6.5 7
405842 G13
Power FET “ON” Resistance
vs Temperature
700
VCC = 4.2V
650
IBAT = 100mA
RPROG = 2k
600
550
500
450
400
350
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
405842 G17
Charge Current
vs Ambient Temperature
600
ONSET OF THERMAL REGULATION
500
RPROG = 2k
400
VCC = 5V
300 VBAT = 4V
θJA = 40°C/W
200
RPROG = 10k
100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
405842 G14
Recharge Threshold Voltage
vs Temperature
4.16
VCC = 5V
RPROG = 10k
4.14
4.12
4.10
4.08
4.06
4.04
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
405842 G15
PI FU CTIO S
ITERM (Pin 1): Charge Termination Program. The charge
termination current threshold current is programmed by
connecting a 1% resistor, RTERM, to ground. The current
threshold ITERM, is set by the following formula:
ITERM
=
100V
RTERM
,
RTERM
=
100V
ITERM
BAT (Pin 2): Charge Current Output. Provides charge
current to the battery from the internal P-channel MOSFET,
and regulates the final float voltage to 4.2V. An internal
precision resistor divider from this pin sets the float
voltage. This divider is disconnected in shutdown mode to
minimize current drain from the battery.
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 package pad (Pin 9) is electrical ground and
must be soldered to the PC board for maximum heat
transfer.
406842fa
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5 Page 
APPLICATIO S I FOR ATIO
Reverse Polarity Input Voltage Protection
In some applications, protection from reverse polarity
voltage on VCC is desired. If the supply voltage is high
enough, a series blocking diode can be used. In other
cases, where the voltage drop must be kept low, a P-channel
MOSFET can be used (as shown in Figure 4).
LTC4068-4.2/LwTwCw.D4a0taS6he8etX4U.-c4om.2
DRAIN-BULK
DIODE OF FET
VIN
LTC4068
VCC
405842 F04
Figure 4. Low Loss Input Reverse Polarity Protection
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 ±0.05
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.28 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
5
0.38 ± 0.10
8
PIN 1
TOP MARK
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
0.200 REF
0.75 ±0.05
0.00 – 0.05
4
0.28 ± 0.05
(DD8) DFN 0203
1
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4068-4.2.PDF ] | |
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