LTC4050 LINER [Linear Technology], LTC4050 Datasheet
LTC4050
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LTC4050 Summary of contents
Page 1
... The thermistor interface suspends charging if the cell temperature is outside 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 ...
Page 2
... unless otherwise noted CONDITIONS Charger On, Current Mode Shutdown Mode Sleep Mode (Battery Drain Current) LTC4050-4. 10V LTC4050-4. 10V LTC4050-4. 10V CC LTC4050-4. 10V 19.6k 0.2 PROG SENSE R = 19.6k 0.2 PROG SENSE R = 97.6k 0.2 PROG ...
Page 3
... High to Low (LTC4050-4.1) BAT V from High to Low (LTC4050-4.2) BAT Note 2: The LTC4050E is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. Charge Current vs V ...
Page 4
... V (V) CC LTC4050 G08 NTC R Threshold Voltage HOT vs Temperature 4. 4.14 4.12 4.10 4.08 4.06 4.04 – –25 0 TEMPERATURE ( C) LTC4050 G11 NTC R Threshold Voltage COLD 28. 28.55 28.50 28.45 28. (V) CC LT4050 G14 LTC4050 G09 75 100 125 LTC4050 G12 8 10 LTC4050 G15 ...
Page 5
... This resistor is chosen using the following equation • 800 )/(R SENSE PROG ACPR (Pin 10): Wall Adapter Present Output. When the input voltage (wall adaptor) is applied to the LTC4050, this = TIMER pin is pulled to ground by an internal N-channel MOSFET that is capable of sinking 5mA suitable for driving an external LED. LTC4050 BAT • ...
Page 6
... PROG – C/10 720 LOGIC SLP OSCILLATOR COUNTER 3.6V V REF + A1 – 2.3 A PROG 6 • SENSE R PROG + 3.88V (LTC4050-4.1) 3.98V (LTC4050-4.2) C5 – SENSE + 54mV – 800 + C4 – – DRV CA + – BAT C2 LBO + – REF 2.47V CHARGE GND 5 4050 BD R SENSE 9 ...
Page 7
... U OPERATIO The LTC4050 is a linear battery charger controller. The charge current is programmed by the combination of a program resistor (R ) from the PROG pin to ground PROG and a sense resistor (R ) between the V SENSE pins. R sets a program current through an internal PROG trimmed 800 resistor setting up a voltage drop from V to the input of the current amplifier (CA) ...
Page 8
... CHRG pin output becomes high impedance. Shutdown The LTC4050 can be forced into shutdown by floating the PROG pin and allowing the internal 2.3 A current source to pull the pin above the 3.6V shutdown threshold voltage. In shutdown, the DRV pin is pulled the external P-channel MOSFET and resetting the internal timer ...
Page 9
... By using two different value pull-up resistors, a microprocessor can detect three states from this pin (charging, C/10 and stop charging). See Figure 1. When the LTC4050 is in charge mode, the CHRG pin is pulled low by an internal N-channel MOSFET. To detect this mode, force the digital output pin, OUT, high and measure the voltage at the CHRG pin ...
Page 10
... LTC4050 U U APPLICATIONS INFORMATION If a PNP transistor is chosen as the pass transistor, a 1000pF capacitor is required from the DRV pin to V capacitor is needed to help stabilize the voltage loop capacitor at the BAT pin is also recommended when a battery is not present. V Bypass Capacitor CC Many types of capacitors can be used for input bypassing. ...
Page 11
... BSC 4.90 0.15 DETAIL “A” (1.93 .006) 0.254 (.010) 0 – 6 TYP 0.53 0.01 (.021 .006) DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) TYP LTC4050 0.497 0.076 (.0196 .003 REF 3.00 0.102 (.118 .004) NOTE 0.86 1.10 (.034) (.043) REF MAX 0 ...
Page 12
... Li-Ion 2 5 CELL 0. 0.082 8 1/ SENSE 3 CHRG ACPR 1 1 DRV Si2305DS 7 LTC1693-5 LTC4050-4 TIMER BAT 6 PROG 15 H 0.1 F CDRH6D28-150NC NTC GND 19. 4.1V Li-Ion 10k NTC CELL DALE NTHS-1206N02 COMMENTS V Can Be Higher or Lower Than Battery Voltage, 1.5A Switch IN Precise Output Current Programming 32V V Time or Charge Current Termination, Automatic Charger/Battery Detection, Status Output, Preconditioning, 8-Lead MSOP ...