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PDF LTC1732-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC1732-4 | |
| Descripción | Lithium-Ion Linear Battery Charger Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1732-4/LTC1732-4.2
Lithium-Ion Linear
Battery Charger Controller
FEATURES
s Complete Linear Charger Controller for 1-Cell
Lithium-Ion Batteries
s Preset Charge Voltage with 1% Accuracy
s Programmable Charge Current
s C/10 Charge Current Detection Output
s Programmable Charge Termination Timer
s Small, Thin 10-Pin MSOP Package
s Select Pin Charges 4.1V or 4.2V Cells (LTC1732-4)
s Input Supply (Wall Adapter) Detection Output
s 4.5V to 12V Input Voltage Range
s Automatic Sleep Mode When Input Supply
is Removed (Only 7µA Battery Drain)
s Automatic Trickle Charge of Low Voltage Cells
s Programmable for Constant-Current-Only Mode
s Battery Insertion Detect
s 4.05V Recharge Threshold for 4.2V Cells
(LTC1732-4.2)
s 3.8V Recharge Threshold for 4.1V or 4.2V Cells
(LTC1732-4)
U
APPLICATIO S
s Cellular Phones
s Handheld Computers
s Charging Docks and Cradles
DESCRIPTIO
The LTC®1732 is a complete constant-current/constant-
voltage linear charger controller for lithium-ion
(Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal-
hydride (NiMH) batteries can also be charged with con-
stant current using external termination. Charge current
can be programmed with 7% (max) accuracy using exter-
nal sense and program resistors. An internal resistor
divider and precision reference set the final float voltage
with 1% accuracy. The SEL pin allows users to charge
either 4.1V or 4.2V cells.
When the input supply is removed, the LTC1732 automati-
cally enters a low current sleep mode, dropping the battery
drain current to 7µA. An internal comparator detects the
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 2.457V.
The LTC1732 begins a new charge cycle when a discharged
battery is connected to the charger or when the input power
is applied. In addition, if the battery remains connected to
the charger and the cell voltage drops below 3.8V for the
LTC1732-4 or below 4.05V for the LTC1732-4.2, a new
charge cycle will automatically begin.
The LTC1732 is available in the 10-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
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Single Cell 4.2V Li-Ion Battery Charger
VIN = 6V
MBRM120T3
R1
1k
CTIMER
0.1µF
R2 8
1k VCC
3
CHRG
2
SEL
SENSE
DRV
9
7
LTC1732-4
10
ACPR
1
BAT
46
TIMER PROG
GND
5
RPROG*
19.6k
RSENSE
0.2Ω
1µF
Q1
Si9430DY
IBAT = 500mA
10µF
+ 4.2V
Li-Ion
CELL
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
1732 TA01
1
1 page  
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LTC1732-4/LTC1732-4.2
PIN FUNCTIONS
BAT (Pin 1): Battery Sense Input. A bypass capacitor of
10µF or more is required to keep the loop stable when the
battery is not connected. A precision internal resistor
divider on this pin sets the final float potential. The resistor
divider is disconnected in sleep mode to reduce the
current drain on the battery.
SEL (Pin 2): 4.1V/4.2V Battery Selection Input Pin. Ground-
ing this pin will set the output float voltage to 4.1V per cell,
while connecting to VCC will set the voltage to 4.2V per cell.
For the LTC1732-4.2, the SEL pin must be connected to
VCC.
CHRG (Pin 3): Open-Drain Charge Status Output. When
the battery is being charged, 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 35µA current
source is connected from the CHRG pin to GND. When the
timer runs out or the input supply is removed, the current
source will be disconnected and the CHRG pin is forced
into a high impedance state.
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
(hours) = (CTIMER • 3 hours)/(0.1µF). When the TIMER pin
is connected to VCC, the timer is disabled, the constant-
voltage mode is disabled and the chip will operate in
constant-current mode only. 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 2.5µA current source to pull the pin above the
2.457V shutdown threshold voltage.
DRV (Pin 7): Drive Output Pin for the P-Channel MOSFET
or PNP Transistor. If a PNP pass transistor is used, select
a high beta transistor to minimize the charge current error
due to the base current.
VCC (Pin 8): Positive Input Supply Voltage. When VBAT is
within 54mV of VCC, the LTC1732 is forced into sleep
mode, dropping ICC to 7µA. VCC ranges from 4.5V to 12V.
Bypass this pin with a 1µF capacitor.
SENSE (Pin 9): Current Sense Input. A sense resistor,
RSENSE, must be connected from VCC to the SENSE pin.
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 adapter) greater than the undervoltage
lockout threshold is applied to the LTC1732, this pin is
pulled to ground by an internal N-channel MOSFET that is
capable of sinking 5mA to drive an external LED.
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5
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LTC1732-4/LTC1732-4.2
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
MS10 Package
10-Lead Plastic MSOP
(LTC DWG # 05-08-1661)
0.118 ± 0.004*
(3.00 ± 0.102)
10 9 8 7 6
0.193 ± 0.006
(4.90 ± 0.15)
0.118 ± 0.004**
(3.00 ± 0.102)
12345
0.007
(0.18)
0° – 6° TYP
0.021 ± 0.006
(0.53 ± 0.015)
0.043
(1.10)
MAX
SEATING
PLANE 0.007 – 0.011
(0.17 – 0.27)
0.0197
(0.50)
BSC
0.034
(0.86)
REF
0.005 ± 0.002
(0.13 ± 0.05)
MSOP (MS10) 1100
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
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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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1732-4.PDF ] | |
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