ltc4054l Linear Technology Corporation, ltc4054l Datasheet
ltc4054l
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ltc4054l Summary of contents
Page 1
... When the input supply (wall adapter or USB supply) is removed, the LTC4054L automatically enters a low cur- rent state, dropping the battery drain current to less than 2 A. The LTC4054L can be put into shutdown mode, re- ducing the supply current Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage ...
Page 2
... PROG BAT 150mA) (Note 5) PROG BAT R = 1k, Current Mode PROG CHRG I = 5mA CHRG V – V FLOAT RECHRG ORDER PART NUMBER LTC4054LES5-4.2 5 PROG PART MARKING LTAFA MIN TYP MAX UNITS 4.25 6.5 V 1200 2000 A 200 500 4.158 4.2 4.242 V 9 ...
Page 3
... Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LTC4054LE-4.2 is guaranteed to meet performance specifica- tions from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 4
... LTC4054L-4 TYPICAL PERFOR A CE CHARACTERISTICS PROG Pin Pull-Up Current vs Temperature and Supply Voltage 3 4.3V BAT PROG 3.5 3 4.2V CC 2.9 2.7 2.5 – 100 125 –25 0 TEMPERATURE ( C) 4054L G04 Regulated Output (Float) Voltage vs Charge Current 4. 600 PROG 4. 4.22 4.20 4.18 4.16 4. ...
Page 5
... V (V) BAT Recharge Voltage Threshold vs Temperature 4. PROG 4.09 4.07 4.05 4.03 4.01 3.99 –50 – TEMPERATURE ( C) LTC4054L-4.2 Trickle Charge Current vs Supply Voltage PROG 2.5V BAT 15k PROG 0 100 4 5 5.5 4.5 V (V) CC 4054L G14 Charge Current vs Supply Voltage 200 V ...
Page 6
... N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately connected to the CHRG pin, indicating an “AC present” condition. When the LTC4054L detects an undervoltage lockout condition, CHRG is forced high impedance. GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4 ...
Page 7
... W BLOCK DIAGRA 120 C T DIE SHDN CHRG 1 STANDBY – – – 0. – – 2.9V TO BAT PROG 5 R PROG LTC4054L-4 150 BAT – REF 1.21V GND 2 4054L42 BD 4054l42f 7 ...
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... PROG pin. Figure 1 shows the state diagram of a typical charge cycle. 1 Any external sources that hold the PROG pin above 100mV will prevent the LTC4054L from terminating a charge cycle. 1 for longer ) on the ...
Page 9
... The charge status output has three different states: strong pull-down (~10mA), weak pull-down (~20uA), and high impedance. The strong pull-down state indicates that the LTC4054L charge cycle. Once the charge cycle has terminated, the pin state is determined by undervoltage lockout conditions. A weak pull-down indicates that V meets the UVLO conditions and the LTC4054L is ready to charge ...
Page 10
... LTC4054L-4.2 U OPERATIO Manual Shutdown At any point in the charge cycle, the LTC4054L can be put into shutdown mode by removing R PROG pin. This reduces the battery drain current to less than 2 A and the supply current to less than new charge cycle can be initiated by reconnecting the program resistor ...
Page 11
... PROG pin and the filter capacitor to ensure stability. Power Dissipation The conditions that cause the LTC4054L to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the IC. Nearly all of this power dissipation is generated from the internal MOSFET— ...
Page 12
... C – (6V – 3.75V) • (150mA) • 200 C 120 C – 0.3375W • 200 C/W = 120 C – The LTC4054L can be used above 52.5 C, but the charge current will be reduced from 150mA. The approximate current at a given ambient temperature can be approxi- mated by: 120 C T – A ...
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... To detect when the LTC4054L is in charge mode, force the digital output pin (OUT) high and measure the voltage at the CHRG pin. The N-channel MOSFET will pull the pin voltage low even with the 2k pull-up resistor ...
Page 14
... W U USB and Wall Adapter Power The LTC4054L allows charging from both a wall adapter and a USB port. Figure 5 shows an example of how to combine wall adapter and USB power inputs. A P-channel MOSFET, MP1, is used to prevent back conducting into the USB port when a wall adapter is present and a Schottky diode, D1, is used to prevent USB power loss through the 1k pull-down resistor ...
Page 15
... U S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.95 REF 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) PIN ONE 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LTC4054L-4.2 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 4054l42f 15 ...
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... For Simultaneous Operation of USB Peripheral and Battery Charging from USB Port, Keeps Current Drawn from USB Port Constant, Keeps Battery Fresh, Use with the LTC4053, LTC1733, or LTC4054 www.linear.com Basic Li-Ion Battery Charger with Reverse Polarity Input Protection 100mA BAT CC LTC4054L-4 PROG 1 F GND 2 1.5k 4054L42 TA03 100mA + Li-Ion CELL 1 ...