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LTC4040 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4040 Datasheet(HTML) 1 Page - Linear Technology |
1 / 26 page LTC4040 1 4040fa For more information www.linear.com/LTC4040 Typical applicaTion FeaTures DescripTion 2.5A Battery Backup Power Manager TheLTC®4040isacomplete3.5Vto5.5Vsupplyrailbattery backup system. It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery. When external power is available, the step-up regulator operates in reverse as a step-down battery charger. The LTC4040’s adjustable input current limit function reduces charge current to protect the main supply from overload while an external disconnect switch isolates the external supply during backup. When the input supply drops below the adjustable PFI threshold, the 2.5A boost regulator delivers power from the battery to the system output. An optional input overvoltage protection (OVP) circuit protects the LTC4040 from high voltage damage at the VIN pin. One logic input selects either the Li-Ion or the LiFePO4batteryoption,andtwootherlogicinputsprogram the battery charge voltage to one of four levels suitable for backup applications. The LTC4040 is available in a low profile (0.75mm) 24-Lead 4mm × 5mm QFN package. 4.5V Backup Application with 4.22V PFI Threshold (Charge Current Setting: 1A, Input Current Limit Setting: 2A) Normal to Backup Mode Transition Waveform applicaTions n Step-Up Backup Supply and Step-Down Battery Charger n 6.5A Switches for 2.5A Backup from 3.2V Battery n Input Current Limit Prioritizes Load Over Charge Current n Input Disconnect Switch Isolates Input During Backup n Automatic Seamless Switch-Over to Backup Mode n Input Power Loss Indicator n System Power Loss Indicator n Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO4 (3.45V/3.5V/3.55V/3.6V) n Optional OVP Circuitry Protects Device to >60V n Constant Frequency Operation n Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package n Fleet and Asset Tracking n Automotive GPS Data Loggers n Automotive Telematics Systems n Toll Collection Systems n Security Systems n USB Powered Devices L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6570372, 6700364, 8139329. + 324k 2.2µH VSYS PROG BSTOFF CHGOFF F2 F1 F0 IGATE LTC4040 VIN CLN 1500k 4.5V 12m 10µF 100µF 2.2µF SYSTEM LOAD BSTFB RSTFB 4.5V INPUT SUPPLY SW BAT NTC NTC VSYS 2k LiFePO4 3.6V 4040 TA01a VIN OVSNS PFI FAULT PFO RST CHRG CLPROG 154k 60.4k 1A VSYS VIN IBAT VBAT = 3.3V RPROG = 2k ISYS = 1A CSYS = 100µF TIME (ms) –0.4 0 0.4 0.8 1.2 –1 0 1 2 3 4 5 –2 0 2 4 6 8 10 Waveform (LiFePO4 App.) Normal to Backup Mode Transition 4040 TA01b |
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