Order this document from Analog Marketing LITHIUM BATTERY PROTECTION CIRCUIT FOR THREE OR FOUR CELL SMART BATTERY PACKS The MC33346 is a monolithic lithium battery protection circuit that is designed to enhance the useful operating life of three or four cell rechargeable battery packs. Cell protection features consist of independently programmable charge and discharge limits for both voltage and current with a delayed current shutdown, cell voltage balancing with on–chip balancing resistors, and virtually zero current sleepmode state when the cells are discharged. Additional features consists of a six wire microcontroller interface bus that can selectively provide a pulse output that represents the internal reference voltage, cell voltage, cell current and temperature, as well as control the states of four internal balancing and two external MOSFET switches. A microcontroller time reference output is available for gas gauge implementation. This protection circuit requires a minimum number of external components and is targeted for inclusion within the battery pack. The MC33346 is available in standard and low profile 24 lead surface mount packages. • • • • • • • • • • Independently Programmable Charge and Discharge Limits for Both Voltage and Current Delayed Current Shutdown DW SUFFIX PLASTIC PACKAGE CASE 751E (SO–24L) 24 1 DTB SUFFIX PLASTIC PACKAGE CASE 948H (TSSOP–24) 24 1 Typical Four Cell Smart Battery Pack Cell Voltage Balancing with On–Chip Resistors Six Wire Microcontroller Interface Bus Data Output for Reference, Voltage, Current, and Temperature Microcontroller Time Reference Output for Gas Gauging Virtually Zero Current Sleepmode State when Cells are Discharged Programmable for Three or Four Cell Applications Minimum External Components for Inclusion within the Battery Pack Available in Low Profile Surface Mount Packages Cell 4/VCC/ Discharge Current Limit Current Sense Common 7 Charge Current Limit 6 Discharge Gate Drive Output 14 Charge Gate Drive Output 20 2 3 Discharge Voltage Threshold Cell 3 4 Charge Voltage Threshold 24 Cell 2 5 23 Cell Voltage Return MC33346 Cell 1 22 1 Data Output Ref/V/I/T Ground 16 Reference Clock Output Cell 15 Program Device Operating Temperature Range MC33346DW MC33346DTB 8 17 A–to–D Converter Period Package SO–24L TA = –40° to +85°C 19 Interrupt Output 11 Temp ORDERING INFORMATION Charge Gate Drive Common 21 Cell Voltage 18 VC Logic Supply 13 Address Input 10 Data Input 12 9 Charge Gate Turn Off/ Test Input TSSOP–24 This device contains 4760 active transistors. This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. MOTOROLA ANALOG IC DEVICE DATA Motorola, Inc. 1996 Issue 1 1 MC33346 OUTLINE DIMENSIONS DTB SUFFIX PLASTIC PACKAGE CASE 948H–01 (TSSOP–24) ISSUE O 24X K REF 0.10 (0.004) 0.15 (0.006) T U M T U V S S S 2X 24 L/2 B –U– L PIN 1 IDENT. 12 1 0.15 (0.006) T U NOTES: 1 DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2 CONTROLLING DIMENSION: MILLIMETER. 3 DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4 DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5 DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6 TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7 DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE –W–. 13 S A –V– DIM A B C D F G H J J1 K K1 L M C 0.10 (0.004) –T– SEATING PLANE G D H –W– MILLIMETERS MIN MAX 7.70 7.90 4.30 4.50 ––– 1.20 0.05 0.15 0.50 0.75 0.65 BSC 0.27 0.37 0.09 0.20 0.09 0.16 0.19 0.30 0.19 0.25 6.40 BSC 0_ 8_ INCHES MIN MAX 0.303 0.311 0.169 0.177 ––– 0.047 0.002 0.006 0.020 0.030 0.026 BSC 0.011 0.015 0.004 0.008 0.004 0.006 0.007 0.012 0.007 0.010 0.252 BSC 0_ 8_ DETAIL E N 0.25 (0.010) K ÉÉ ÇÇÇ ÇÇÇ ÉÉ ÇÇÇ K1 J1 SECTION N–N J 2 M N F DETAIL E MOTOROLA ANALOG IC DEVICE DATA MC33346 OUTLINE DIMENSIONS DW SUFFIX PLASTIC PACKAGE CASE 751E–04 (SO–24L) ISSUE E –A– 24 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. 13 –B– 12X P 0.010 (0.25) 1 M B M 12 24X D J 0.010 (0.25) M T A S B S F R C –T– SEATING PLANE M 22X G K X 45 _ DIM A B C D F G J K M P R MILLIMETERS MIN MAX 15.25 15.54 7.40 7.60 2.35 2.65 0.35 0.49 0.41 0.90 1.27 BSC 0.23 0.32 0.13 0.29 0_ 8_ 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.601 0.612 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0_ 8_ 0.395 0.415 0.010 0.029 Motorola reserves the right to make changes without further notice to any products herein. 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