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PDF LTC4050 Data sheet ( Hoja de datos )
| Número de pieza | LTC4050 | |
| Descripción | Lithium-Ion Linear Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4050
Lithium-Ion Linear Battery
Charger with Thermistor Interface
FEATURES
s Complete Standalone Linear Charger Controller
for 1-Cell Lithium-Ion Batteries
s Thermistor Interface for Battery Temperature
Sensing
s Preset Charge Voltage with ±1% Accuracy
s Programmable Charge Current
s C/10 Charge Current Detection Output
s Programmable Charge Termination Timer
s Input Supply (Wall Adapter) Detection Output
s 4.5V to 10V Input Voltage Range
s Automatic Sleep Mode When Input Supply
is Removed (Only 5µA Battery Drain)
s Automatic Trickle Charging of Low Voltage Cells
s Automatic Battery Recharge
s Battery Insertion Detection
s Space Saving 10-Pin MSOP Package
U
APPLICATIO S
s Cellular Phones
s Handheld Computers
s Charging Docks and Cradles
DESCRIPTIO
The LTC®4050-4.1/LTC4050-4.2 are complete standalone
constant-current/constant-voltage linear charge control-
lers for lithium-ion (Li-Ion) batteries. Charge current is
programmable and final float voltage has ±1% accuracy.
When the input supply is removed, the LTC4050 automati-
cally enters a low quiescent current sleep mode, dropping
the battery drain current to 5µA. An internal comparator
detects the near-end-of-charge (C/10) condition while a
programmable timer, using an external capacitor, sets the
total charge time. Fully discharged cells are automatically
trickle charged at 10% of the programmed current until
cell voltage exceeds 2.49V. The thermistor interface
suspends charging if the cell temperature is outside of a
0°C to 50°C temperature window.
The LTC4050 begins a new charge cycle when a discharged
battery is connected to the charger or when the input power
is applied. In addition, a new charge cycle is automatically
started if the battery remains connected to the charger and
the cell voltage drops below 3.88V for 4.1V cells or below
3.98V for 4.2V cells.
The LTC4050 is available in the 10-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Cell 4.2V 500mA Li-Ion Battery Charger
VIN
6V
MBRM120T3
1k
0.1µF
1k
3
8
VCC
SENSE
CHRG DRV
9
7
LTC4050-4.2
10
ACPR
1
BAT
46
TIMER PROG
*
GND NTC
52
19.6k
0.2Ω
1µF
Si9430DY
IBAT = 500mA
10µF
+ 4.2V
Li-Ion
CELL
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
4050 TA01
10k NTC
T DALE NTHS-1206N02
Charge Current vs
Thermistor Temperature
600
VBAT = 3.7V
500
400
300
200
100
0
–50 –25 0 25 50 75 100 125
THERMISTOR TEMPERATURE (°C)
4050 TA05
4050f
1
1 page  
LTC4050
PIN FUNCTIONS
BAT (Pin 1): Battery Sense Input. A precision internal
resistor divider on this pin sets the final float voltage. The
resistor divider is disconnected in sleep mode to reduce
the current drain on the battery. A bypass capacitor of
10µF or more is required to keep the loop stable when the
battery is not connected.
NTC (Pin 2): Thermistor Interface Input. A 10kΩ Dale
Curve 2 NTC thermistor (or other 10kΩ NTC thermistor
with a room temperature beta of around 3400) is con-
nected from this pin to ground. The charge cycle will be
disabled and the timer will be placed on hold if the
thermistor temperature is above 50°C or below 0°C.
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 current
drops to 10% of the full-scale current for more than 15ms,
the N-channel MOSFET turns off and a 32µA current
source is connected from the CHRG pin to GND. When the
timer runs out or the input supply is removed, the current
source is disconnected and the CHRG pin becomes high
impedance.
TIMER (Pin 4): Timer Capacitor and Constant-Voltage
Mode Disable Input Pin. The timer period is set by placing
a capacitor, CTIMER, to GND. The timer period is tTIMER =
(CTIMER • 3 hours)/(0.1µF). Shorting the TIMER pin to
GND will disable the internal timer function and the C/10
function.
GND (Pin 5): Ground.
PROG (Pin 6): Charge Current Program and Shutdown
Input Pin. The charge current is programmed by connect-
ing a resistor, RPROG to ground. The charge current is IBAT
= (VPROG • 800Ω)/(RPROG • RSENSE). The IC can be forced
into shutdown by floating the PROG pin and allowing the
internal 2.3µA current source to pull the pin above the 3.6V
shutdown threshold voltage.
DRV (Pin 7): Drive Output Pin for the P-Channel MOSFET
or PNP Transistor. The impedance is high at this pin,
therefore, if a PNP pass transistor is used, it must have
high gain.
VCC (Pin 8): Positive Input Supply Voltage. VCC can range
from 4.5V to 10V. Bypass this pin with a 1µF capacitor.
When VBAT is within 54mV of VCC, the LTC4050 is forced
into sleep mode, dropping ICC to 5µA.
SENSE (Pin 9): Current Sense Input. A sense resistor,
RSENSE, must be connected from VCC to the SENSE pin.
Select a resistor value that will develop approximately
100mV at the programmed full-scale charge current.
This resistor is chosen using the following equation:
RSENSE = (VPROG • 800Ω)/(RPROG • IBAT)
ACPR (Pin 10): Wall Adapter Present Output. When the
input voltage (wall adaptor) is applied to the LTC4050, this
pin is pulled to ground by an internal N-channel MOSFET
that is capable of sinking 5mA suitable for driving an
external LED.
4050f
5
5 Page 
PACKAGE DESCRIPTIO
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 ± 0.127
(.035 ± .005)
LTC4050
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.305 ± 0.038
(.0120 ± .0015)
TYP
0.50
(.0197)
BSC
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
10 9 8 7 6
0.497 ± 0.076
(.0196 ± .003)
REF
0.254
(.010)
DETAIL “A”
0° – 6° TYP
4.90 ± 0.15
(1.93 ± .006)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
GAUGE PLANE
12345
0.18
(.007)
0.53 ± 0.01
(.021 ± .006)
DETAIL “A”
1.10
(.043)
MAX
SEATING
PLANE 0.17 – 0.27
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
(.007 – .011)
TYP
0.50
(.0197)
BSC
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.86
(.034)
REF
0.13 ± 0.076
(.005 ± .003)
MSOP (MS) 0802
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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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4050.PDF ] | |
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