LTC1732-4 LINER [Linear Technology], LTC1732-4 Datasheet

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LTC1732-4

Manufacturer Part Number
LTC1732-4
Description
Lithium-Ion Linear Battery Charger Controller
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Complete Linear Charger Controller for 1-Cell
Lithium-Ion Batteries
Preset Charge Voltage with 1% Accuracy
Programmable Charge Current
C/10 Charge Current Detection Output
Programmable Charge Termination Timer
Small, Thin 10-Pin MSOP Package
Select Pin Charges 4.1V or 4.2V Cells (LTC1732-4)
Input Supply (Wall Adapter) Detection Output
4.5V to 12V Input Voltage Range
Automatic Sleep Mode When Input Supply
is Removed (Only 7 A Battery Drain)
Automatic Trickle Charge of Low Voltage Cells
Programmable for Constant-Current-Only Mode
Battery Insertion Detect
4.05V Recharge Threshold for 4.2V Cells
(LTC1732-4.2)
3.8V Recharge Threshold for 4.1V or 4.2V Cells
(LTC1732-4)
Cellular Phones
Handheld Computers
Charging Docks and Cradles
U
U
C
TIMER
0.1 F
R1
1k
Single Cell 4.2V Li-Ion Battery Charger
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
R2
1k
10
3
4
CHRG
ACPR
TIMER
V
LTC1732-4
CC
8
GND
5
SENSE
SEL
PROG
DRV
BAT
2
9
7
1
6
R
19.6k
PROG
DESCRIPTIO
The LTC
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 7 A. 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.
V
IN
= 6V
Battery Charger Controller
Q1
Si9430DY
R
0.2
SENSE
I
MBRM120T3
10 F
BAT
®
= 500mA
1732 is a complete constant-current/constant-
LTC1732-4/LTC1732-4.2
+
1732 TA01
4.2V
Li-Ion
CELL
1 F
U
Lithium-Ion Linear
1

Related parts for LTC1732-4

LTC1732-4 Summary of contents

Page 1

... 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. ...

Page 2

... unless otherwise noted CONDITIONS Charger On, Current Mode Shutdown Mode Sleep Mode (Battery Drain Current) LTC1732- 12V GND CC SEL LTC1732-4/LTC1732-4. 12V 19.6k 0.2 PROG SENSE R = 19.6k 0.2 PROG SENSE ...

Page 3

... R = 0.2 PROG SENSE C = 0.1 F TIMER V from High to Low (LTC1732-4) BAT V from High to Low (LTC1732-4.2) BAT Note 2: The LTC1732E is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. ...

Page 4

... Program Pin Voltage vs V 2.480 R =19.6k PROG 2.475 BAT 2.470 2.465 2.460 2.455 2.450 2.445 2.440 (V) CC 1732 G08 Recharge Threshold Voltage vs Temperature 4 LTC1732-4.2 4.0 3.9 3.8 LTC1732-4 3.7 –50 – 100 125 TEMPERATURE ( C) 1732 G11 1732 G09 ...

Page 5

... 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 V will set the voltage to 4.2V per cell. CC For the LTC1732-4.2, the SEL pin must be connected 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 ...

Page 6

... LOCKOUT V = 4.1V UV CHRG 3 C/10 STOP UVLO 35 A ACPR LOGIC SHDN TIMER 4 OSCILLATOR ACPR 10 C3 BATTERY CURRENT I = (2.457V • 800 )/(R BAT PROG 3.8V (LTC1732-4) + 4.05V (LTC1732-4.2) C5 – – RECHRG C/10 720 SLP COUNTER V REF + + – – 2.5 A PROG 6 • SENSE R PROG SENSE ...

Page 7

... PROG When the battery approaches the final float voltage, the charge current will begin to decrease. When the current LTC1732-4/LTC1732-4.2 drops to 10% of the full-scale charge current, an internal comparator will turn off the pull-down N-channel MOSFET at the CHRG pin and connect a weak current source to and SENSE ground to indicate an end-of-charge (C/10) condition ...

Page 8

... To disable only the timer function, short the TIMER pin to GND. Battery Detection and Recharge LTC1732-4: replacing the battery before the timer has ex- pired will reset the timer, thus starting a new charge cycle, provided the cell voltage of the new battery is less than 3 ...

Page 9

... LTC1732-4 with the SEL pin grounded. The LT1732-4 can also be used for charging 4.2V cells by connecting the SEL pin 3.8V, thus allowing either 4.1V or 4.2V cells to be charged. Because the recharge threshold voltage level of the LTC1732-4.2 is preset for 4.05V, this version is not recommended for 4.1V cells. LTC1732-4/LTC1732-4.2 sets it to 4.2V. CC ...

Page 10

... BAT pin is also recommended when a battery is not present. Li-Ion Linear Charger Using a PNP Transistor 1nF 10k CHRG SENSE ACPR DRV 2N5087 LTC1732 TIMER BAT 6 PROG SEL GND R PROG 2 5 19.6k MBRM120T3 R C3 SENSE 0 ZTX749 I = 500mA BAT + 4 ...

Page 11

... Plastic MSOP (LTC DWG # 05-08-1661) 0.118 0.004* (3.00 0.102) 0.193 0.006 (4.90 0.15) 0.043 (1.10) MAX 0 – 6 TYP SEATING PLANE 0.007 – 0.011 0.021 0.006 (0.17 – 0.27) (0.53 0.015) LTC1732-4/LTC1732-4 0.118 0.004** (3.00 0.102 0.034 (0.86) REF 0.005 0.002 (0.13 0.05) 0.0197 MSOP (MS10) 1100 (0.50) ...

Page 12

... 4 CHRG SENSE DRV ACPR 7 LTC1693-5 4 LTC1732 TIMER BAT 6 PROG R4 SEL GND + 19. COMMENTS Most Compact 1.5A, Charges NiCd, NiMH, Li-Ion Cells V Can Be Higher or Lower Than Battery Voltage, 1.5A Switch IN Low Cost Linear Charger—See Design Note 188 ...

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