LTC1732-4.2 Linear Technology, LTC1732-4.2 Datasheet
LTC1732-4.2
Related parts for LTC1732-4.2
LTC1732-4.2 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
... 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. U ...
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
... BLOCK DIAGRA UNDERVOLTAGE LOCKOUT V = 4.1V UV CHRG 3 C/10 STOP 35 A ACPR SHDN TIMER 4 ACPR 10 BATTERY CURRENT I = (2.457V • 800 )/(R BAT www.DataSheet4U.com 3.8V (LTC1732-4) + 4.05V (LTC1732-4.2) C5 – – UVLO RECHRG C/10 720 LOGIC SLP OSCILLATOR COUNTER V REF + + – – PROG 6 • R ...
Page 7
... An internal current source will pull this pin CC high and clamp it at 3.5V. When the input voltage is not present, the charger goes into a sleep mode, dropping I reduces the current drain on the battery and increases the . standby time. LTC1732-4/LTC1732-4 This greatly CC 7 ...
Page 8
... LTC1732-4.2: replacing the battery before the timer has expired will reset the timer, thus starting a new charge cycle, provided the cell voltage of the new battery is less than 4 ...
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
... LTC1732-4/LTC1732-4 APPLICATIONS INFORMATION Gate Drive Typically the LTC1732 controls an external P-channel MOSFET to supply current to the battery. An external PNP transistor can also be used as the pass transistor instead of the P-channel MOSFET. Due to the low transconductance of the current amplifier (CA), a high gain Darlington PNP transistor is required to avoid excessive charge current error ...
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... 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) ...
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... LTC1732-4/LTC1732-4.2 TYPICAL APPLICATIO RELATED PARTS PART NUMBER DESCRIPTION ® LT 1510-5 500kHz Constant-Voltage/Constant-Current Battery Charger LT1512 SEPIC Battery Charger LTC1541 Op Amp, Comparator and Reference with LT1620 Rail-to-Rail Current Sense Amplifier LTC1729 Termination Controller for Li-Ion LTC1730 Li-Ion Pulse Charger ...