LTC4054-4.2 LINER [Linear Technology], LTC4054-4.2 Datasheet
LTC4054-4.2
Related parts for LTC4054-4.2
LTC4054-4.2 Summary of contents
Page 1
... BAT LTC4054-4.2 5 PROG GND 1.65k 2 LTC4054-4.2/LTC4054X-4.2 Li-Ion Battery Charger with Thermal Regulation in ThinSOT DESCRIPTIO ® The LTC 4054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count TM make the LTC4054 ideally suited for portable applications. ...
Page 2
... LTC4054-4.2/LTC4054X-4 ABSOLUTE AXI U RATI GS (Note 1) Input Supply Voltage (V ) ....................... –0.3V to 10V CC PROG ............................................. – 0. BAT .............................................................. –0. CHRG ........................................................ –0.3V to 10V BAT Short-Circuit Duration .......................... Continuous BAT Pin Current ................................................. 800mA PROG Pin Current ................................................ 800 A Maximum Junction Temperature .......................... 125 C Operating Ambient Temperature Range (Note 2) .............................................. – ...
Page 3
... 10k PROG 1.005 1.000 0.995 0.990 0.985 4.0 5.0 5.5 6.0 6.5 7.0 4.5 V (V) CC 4054 G01 LTC4054-4.2/LTC4054X-4.2 The denotes specifications which apply over the full operating = 5V, unless otherwise noted CONDITIONS =1000V/R BAT BAT PROG V High to Low BAT I Falling Below I /10 ...
Page 4
... LTC4054-4.2/LTC4054X-4 TYPICAL PERFOR A CE CHARACTERISTICS PROG Pin Pull-Up Current vs Temperature and Supply Voltage 3 4.3V BAT PROG 3 4.2V CC 3.3 3 6.5V CC 2.9 2.7 2.5 –50 – 100 125 TEMPERATURE ( C) 4054 G04 Regulated Output (Float) Voltage vs Charge Current 4. 4. 1.25k PROG 4 ...
Page 5
... ONSET OF CC 300 THERMAL BAT = 80 C/W REGULATION JA 200 R = 10k PROG 100 0 50 100 125 –50 – TEMPERATURE ( C) 4054 G19 LTC4054-4.2/LTC4054X-4.2 Trickle Charge Current vs Temperature PROG 2.5V BAT 10k PROG 0 – 100 –25 ...
Page 6
... LTC4054-4.2/LTC4054X-4 CTIO S CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately connected to the CHRG pin, indicating an “AC present” ...
Page 7
... W BLOCK DIAGRA 120 DIE SHDN CHRG 1 STANDBY TRICKLE CHARGE DISABLED ON LTC4054X LTC4054-4.2/LTC4054X-4.2 1 – – – 0. – BAT C3 – 2.9V PROG 1000 BAT – REF 1.21V GND 2 R 405442 BD ...
Page 8
... LTC4054-4.2/LTC4054X-4.2 U OPERATIO The LTC4054 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of 1%. The LTC4054 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required ...
Page 9
... At any point in the charge cycle, the LTC4054 can be put into shutdown mode by removing R PROG pin. This reduces the battery drain current to less LTC4054-4.2/LTC4054X-4.2 than 2 A and the supply current to less than new CC charge cycle can be initiated by reconnecting the program resistor ...
Page 10
... LTC4054-4.2/LTC4054X-4 APPLICATIO S I FOR ATIO Stability Considerations The constant-voltage mode feedback loop is stable with- out an output capacitor provided a battery is connected to the charger output. With no battery present, an output capacitor is recommended to reduce ripple voltage. When using high value, low ESR ceramic capacitors recom- mended to add a 1 resistor in series with the capacitor ...
Page 11
... Other heat sources on the board, not related to the charger, must also be considered when designing a PC board layout because they will affect overall temperature rise and the maximum charge current. LTC4054-4.2/LTC4054X-4 The following table lists thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 3/32" ...
Page 12
... LTC4054-4.2/LTC4054X-4 APPLICATIO S I FOR ATIO BAT LTC4054-4 PROG GND Figure 3. A Circuit to Maximize Thermal Mode Charge Current Solving for I using the quadratic formula BAT I BAT – – – BAT S BAT Using ...
Page 13
... 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. LTC4054-4.2/LTC4054X-4 detect when the LTC4054 is in charge mode, force the digital output pin (OUT) high and measure the voltage at the CHRG pin ...
Page 14
... MN1, and an extra 10k program resistor are used to increase the charge current to 600mA when the wall adapter is present WALL ADAPTER 600mA I USB POWER 500mA I Figure 7. Combining Wall Adapter and USB Power I CHG LTC4054-4.2 CHG 3 D1 BAT CHG 5 MP1 + PROG 10k ...
Page 15
... NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 LTC4054-4.2/LTC4054X-4 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.95 REF 1.22 REF 1.50 – ...
Page 16
... LTC4053, LTC1733, or LTC4054 www.linear.com 500mA BAT 330 LTC4054-4 CHRG PROG GND 2k 2 SHDN 405442 TA02 500mA BAT CC LTC4054-4 PROG 1 F GND 2 2k 405442 TA04 LT/TP 0903 1K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2003 405442xf ...