LM3620 Datasheet | National Semiconductor

Description The LM3620 series of controllers are monolithic integrated circuits designed to control the charging and end-of-charge control for lithium-ion rechargeable batteries. The LM3620 is available in two versions for one or two cell charger applications. Each version provides the option of selecting the appropriate termination voltage for either coke or graphite anode lithium cells. The LM3620 can operate from a wide range of DC input sources (4V to 30V). With no charger supply connected, the controller draws a quiescent current of only 10n A to minimize discharging of a connected battery pack. The LM3620 consists of an operational transconductance amplifier, a bandgap voltage reference, a NPN driver transistor and precision voltage setting resistors. The output of the amplifier is made available to drive an external power transistor if higher drive currents are required. With a trimmed output voltage regulation of ± 1.2% initial accuracy, the LM3620 provides a simple, precise solution for end-of-charge control of lithium-ion rechargeable cells. The LM3620 is packaged in a miniature 5-lead SOT-23 surface mount package for very pact designs. Features n n n n n n n Voltage options for charging 1 or 2 cell stacks Adjustable output voltage for coke or graphite anodes Precision end-of-charge voltage control Wide input voltage range (4V to 30V) Low off state current ( < 10n A) Drive provided for external power stage Tiny SOT-23 package Typical Application DS100841-10 © 1999 National Semiconductor Corporation DS100841 .national. Connection Diagram 5-Lead SOT23-5 Surface Mount Package DS100841-1 Refer to the Ordering Information Table in this Data Sheet for Specific Part Number See NS Package MA05B Ordering Information Device Order Number Package Marking Output Voltage Initial Accuracy (25˚C) 1.2% 1.2% 1.2% 1.2% Over Temperature Accuracy (0 to 70˚C) 2% 2% 2% 2% Number of Cells Supplied as LM3620M5-4 LM3620M5X-4 LM3620M5-8 LM3620M5X-8 D10B D10B D11B...