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PDF LTC4058X-4.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4058X-4.2 | |
| Descripción | Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
s Programmable Charge Current Up to 950mA
s Complete Linear Charger in DFN Package
s No MOSFET, Sense Resistor or Blocking Diode
Required
s Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
s Battery Kelvin Sensing Improves Charging Accuracy
s Charges Directly from a USB Port
s C/10 Charge Termination
s Preset 4.2V Charge Voltage with ±1% Accuracy
s Charge Current Monitor Output for Gas Gauging*
s Automatic Recharge
s Charge Status Output
s “AC Present” Output
s 2.9V Trickle Charge Threshold (LTC4058)
s Available Without Trickle Charge (LTC4058X)
s Soft-Start Limits Inrush Current
s Low Profile (3mm × 3mm × 0.75mm) DFN Package
U
APPLICATIO S
s Cellular Telephones, PDAs, MP3 Players
s Bluetooth Applications
LTC4058-4.2/LTC4058X-4.2
Standalone Linear
Li-Ion Battery Charger with
Thermal Regulation in DFN
DESCRIPTIO
The LTC®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 2µA. 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
TYPICAL APPLICATIO
Single Cell Li-Ion Battery Charger with Kelvin Sense
VIN
4.5V TO 6.5V
600mA
VCC BAT
BSENSE
LTC4058-4.2
CHRG
ACPR
EN PROG
+ 1-CELL
Li-Ion
BATTERY
1µF GND 1.65k
405842 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 3.50
VCC = 5V
100
θJA = 40°C/W
RPROG = 1.65k
3.25
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)
405842 TA02
sn405842 405842fs
1
1 page  
LTC4058-4.2/LTC4058X-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Supply Voltage
600
RPROG = 2k
500
400
VBAT = VBSENSE = 4V
300 TA = 25°C
θJA = 40°C/W
200
RPROG = 10k
100
Charge Current
vs Ambient Temperature
600
ONSET OF THERMAL REGULATION
500
RPROG = 2k
400
VCC = 5V
300 VBAT = VBSENSE = 4V
θJA = 40°C/W
200
RPROG = 10k
100
Recharge Threshold Voltage
vs Temperature
4.16
VCC = 5V
RPROG = 10k
4.14
4.12
4.10
4.08
4.06
0
4 4.5 5 5.5 6
VCC (V)
6.5 7
405842 G13
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
405842 G14
4.04
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
405842 G15
Power FET Transistor Curve
800
VCC = 5V
700 VBSENSE = 3.5V
TA = 25°C
600 RPROG = 2k
500
400
300
200
100
0
3.8 4.1 4.4 4.7
VBAT (V)
5 5.3
405842 G16
Power FET “ON” Resistance
vs Temperature
800
VCC = 5V
VBAT = 4.8V
700
VBSENSE = 4V
RPROG = 2k
600
500
400
300
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
405842 G17
PI FU CTIO S
BSENSE (Pin 1): Battery Sense. This pin is used to Kelvin
sense the positive battery terminal and regulate the final
float voltage to 4.2V. An internal precision resistor divider
sets this float voltage and is disconnected in shutdown
mode. For Li-Ion applications, this pin must be electri-
cally connected to BAT.
BAT (Pin 2): Charge Current Output. Provides charge
current to the battery from the internal P-channel MOSFET.
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 of the package (Pin 9) is also ground and must
be soldered to the PC board for maximum heat transfer.
PROG (Pin 5): Charge Current Program and Charge Cur-
rent Monitor. Charge current is programmed by connect-
ing a 1% resistor, RPROG, to ground. When charging in
constant-current mode, this pin servos to 1V. In all modes,
sn405842 405842fs
5
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).
LTC4058-4.2/LTC4058X-4.2
DRAIN-BULK
DIODE OF FET
VIN
LTC4058
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.
sn405842 405842fs
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4058X-4.2.PDF ] | |
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