LM3620 Lithium-Ion Battery Charger Controller General 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 10nA 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 compact 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 ( < 10nA) Drive provided for external power stage Tiny SOT-23 package Typical Application DS100841-10 © 1999 National Semiconductor Corporation DS100841 www.national.com LM3620 Lithium-Ion Battery Charger Controller June 1999 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 Package Marking Output Voltage Initial Accuracy (25˚C) Over Temperature Accuracy (0 to 70˚C) Number of Cells LM3620M5-4 D10B 4.1V/4.2V 1.2% 2% 1 250 Unit increments on Tape and Reel LM3620M5X-4 D10B 4.1V/4.2V 1.2% 2% 1 3k Unit increments on Tape and Reel LM3620M5-8 D11B 8.2V/8.4V 1.2% 2% 2 250 Unit increments on Tape and Reel LM3620M5X-8 D11B 8.2V/8.4V 1.2% 2% 2 3k Unit increments on Tape and Reel Device Order Number Supplied as The small physical size of the SOT23-5 Package does not allow for the full part number marking. Devices will be marked with the designation shown in the column Package Marking. The devices are shipped in tape-and-reel format. The standard quantity is 250 units on a reel (indicated by the letters “M5” in the part number), or 3000 units on a reel (indicated by the letters “M5X” in the part number). www.national.com 2 Absolute Maximum Ratings (Note 1) Power Dissipation (TA = 25˚C) (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 300mW ESD Susceptibility (Note 3) 2000V Operating Ratings (Note 1) Input Voltage (VDRIVE) 35V VEXT 1.5V Ambient Temp. Range 0˚C to 70˚C Junction Temperature 150˚C Junction Temp. Range 0˚C to 125˚C Storage Temperature −65 to +150˚C Lead Temp. Soldering Vapor Phase (60 sec.) Infrared (15 sec.) Thermal Resistance (Junction to Ambient, θJ-A) 215˚C 220˚C 280˚C/W Input Voltage (VDRIVE) 4V to 30V Electrical Characteristics LM3620-4 VDRIVE = 5V, IDRIVE = 2mA. Limits with boldface type apply over the full operating ambient temperature range, 0˚C to +70˚C, limits with standard typeface apply for TA = 25˚C. Symbol VREG Parameter Regulated Output Voltage (pin 1 to ground) Typical Limit Units Pin 5 shorted to pin 1 (graphite anode) Conditions 4.1 4.051/4.018 V(min) 4.149/4.182 V(max) Pin 5 open (coke anode) 4.2 4.150/4.116 V(min) 4.250/4.284 V(max) ± 1.2/ ± 2.0 % Regulated Output Voltage Tolerance Either Pin 5 setting VREG/VDRIVE Supply Sensitivity IQ Quiescent Current VREG for 5V ≤ VDRIVE ≤ 30V VREG = 4.5V, VEXT = 1.0V (Note 4) IOFF Off State Current IDRIVE Drive Pin Sink Current Gm(DRIVE) Drive Pin Transconductance IEXT External Pin Source Current Gm(EXT) External Pin Transconductance ∆IEXT/∆VREG, VEXT = 1V 0mA ≤ IEXT ≤ 2.5mA 0.8 RIN VREG Input Resistance Pin 1 to Ground. Circuit biased with VDRIVE applied VDRIVE open circuited 46 kΩ 42 MΩ 1500 Ω RF Feedback Resistance VDRIVE open circuited (Note 5) VDRIVE = 5.0V ∆IDRIVE/∆VREG 2mA ≤ IDRIVE ≤15mA VEXT = 1V (Note 6) Pin 1 to Pin 5 3 100 µV/V(max) 400 750 µA(max) 10 200 nA(max) 20 15 mA(min) 3 3 A/V 2.5 mA(min) A/V www.national.com LM3620-8 VDRIVE = 5V, IDRIVE = 2mA. Limits with boldface type apply over the full operating ambient temperature range, 0˚C to + 70˚C, limits with standard typeface apply for TA = 25˚C. Symbol VREG Parameter Regulated Output Voltage (pin 1 to ground) Typical Limit Units Pin 5 shorted to pin 1 (graphite anode) Conditions 8.2 8.102/8.036 V(min) 8.298/8.364 V(max) Pin 5 open (coke anode) 8.4 8.299/8.232 V(min) 8.501/8.568 V(max) ± 1.2/ ± 2.0 % Regulated Output Voltage Tolerance Either Pin 5 setting VREG/VDRIVE Supply Sensitivity Quiescent Current VREG for 5V ≤ VDRIVE ≤ 30V VREG = 8.7V, VEXT = 1.0V (Note 4) 200 IQ 400 750 µA(max) IOFF Off State Current 10 200 nA(max) IDRIVE Drive Pin Sink Current VDRIVE open circuited (Note 5) VDRIVE = 5.0V 20 15 mA(min) Gm(DRIVE) Drive Pin Transconductance IEXT External Pin Source Current Gm(EXT) External Pin Transconductance ∆IEXT/∆VREG, VEXT = 1V 0mA ≤ IEXT ≤ 2.5mA 0.4 RIN VREG Input Resistance Pin 1 to Ground. Circuit biased with VDRIVE applied VDRIVE open circuited 110 kΩ 42 MΩ Pin 1 to Pin 5 2900 Ω RF Feedback Resistance ∆IDRIVE/∆VREG 2mA ≤ IDRIVE ≤15mA VEXT = 1V (Note 6) µV/V(max) 1.5 3 A/V 2.5 mA(min) A/V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The maximum power dissipation must be derated at elevated temperatures and is limited by TJMAX (maximum junction temperature), θJ-A (junction-to-ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX = (TJMAX − TA)/θJ-A up to the value listed in the Absolute Maximum Ratings. Note 3: Rating is for the human body model, a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. Note 4: Quiescent current is all current flowing to ground when the voltage at the VREG pin is forced to be above the nominal regulating voltage (VREG). Note 5: Off current is all of the current flowing to ground including all leakage current that would be drawn from the battery connected to the VREG terminal. Note 6: When the External pin is being used as the driving source, it is recommended to keep the operating point of VEXT ≤ 1V. If greater than 1V, the internal circuitry would bias IDRIVE to conduct up to the current limit level continuously causing unnecessary power dissipation in the device. www.national.com 4 Typical Performance Characteristics LM3620M5-4 Normalized Regulation Voltage Change vs IDRIVE Unless otherwise specified, TA = 25˚C. LM3620M5-4 Normalized Regulation Voltage Change vs VDRIVE DS100841-4 LM3620M5-4 Quiescent Current vs VDRIVE LM3620M5-4 Normalized Regulation Voltage Change vs IEXT DS100841-8 LM3620M5-4 Off State Current vs VDRIVE DS100841-5 DS100841-7 LM3620M5-4 Off State Current vs Temperature DS100841-6 DS100841-3 LM3620M5-4 Bode Plot (∆VDRIVE/∆VREG) DS100841-9 5 www.national.com LM3620 Lithium-Ion Battery Charger Controller Physical Dimensions inches (millimeters) unless otherwise noted SOT23-5 Package 5-Lead Small-Outline Package (M5) For Ordering, Refer to Ordering Information Table NS Package Number MA05B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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