LTC4054 Linear Technology Corporation, LTC4054 Datasheet
LTC4054
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LTC4054 Summary of contents
Page 1
... When the input supply (wall adapter or USB supply) is removed, the LTC4054 automatically enters a low current state, dropping the battery drain current to less than 2 A. The LTC4054 can be put into shutdown mode, reducing 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 input voltage ...
Page 2
... PROG PROG R = 10k, Current Mode PROG CHRG I = 5mA CHRG FLOAT RECHRG ORDER PART NUMBER 5 PROG LTC4054ES5-4.2 LTC4054XES5-4 PART MARKING = 100 LTH7 LTADY MIN TYP MAX UNITS 4.25 6.5 1200 2000 200 500 25 50 4.158 4.2 4.242 93 100 ...
Page 3
... Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LTC4054E-4.2 and the LTC4054XE-4.2 are 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
... LTC4054-4.2/LTC4054X-4.2 W BLOCK DIAGRA 120 C T DIE SHDN CHRG 1 STANDBY TRICKLE CHARGE DISABLED ON LTC4054X – – – 0. – – 2.9V TO BAT PROG 5 R PROG 1000 BAT – REF 1.21V GND ...
Page 5
... BAT pin voltage or insufficient voltage is applied to the V pin. A microprocessor can be used to distinguish CC between these three states—this method is discussed in the Applications Information section. Note 1: Any external sources that hold the PROG pin above 100mV will prevent the LTC4054 V from terminating a charge cycle. PROG • 1000 PROG ...
Page 6
... CC voltage. Manual Shutdown 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 than 2 A and the supply current to less than new charge cycle can be initiated by reconnecting the program resistor ...
Page 7
... In such a case, a simple RC filter can be used on the PROG pin to measure the average battery current as shown in Figure 2. A 10k resistor has been added between the PROG pin and the filter capacitor to ensure stability. 10k PROG LTC4054 R C PROG FILTER GND 405442 F02 ...
Page 8
... C – (5V – 3.75V) • (400mA) • 150 C 120 C – 0.5W • 150 C/W = 120 C – The LTC4054 can be used above 45 C ambient, but the charge current will be reduced from 400mA. The approxi- mate current at a given ambient temperature can be approximated by: 120 C T – A ...
Page 9
... BAT While this application delivers more energy to the battery and reduces charge time in thermal mode, it may actually lengthen charge time in voltage mode if V enough to put the LTC4054 into dropout. Figure 4 shows how this circuit can result in dropout as R large. 608 mA ...
Page 10
... To detect when the LTC4054 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 11
... 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 12
... Standalone Charger with Programmable Timer 1.25A Charge Current 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 ...