Ordering number :EN5640A Monolithic linear IC LA5621M, 5621V Lithium-Ion Battery Charge Control IC Overview The LA5621M and LA5621V are external charge control ICs for lithium-ion batteries. These ICs are ideally suited for on/off control of external power MOSFETs in systems that incorporate a charging circuit in the set. They detect the charge and discharge status, output it to the set control microcontroller, which then outputs a signal to switch external power MOSFETS either on or off. Moreover, these ICs have a built-in function that detects discharge (countercurrent) from lithium-ion batteries within sets to external lithium-ion batteries in an AC adapter/charger, etc. and switches external power MOSFETs off. Application • Charge control of 1- or 2-cell lithium-ion batteries of video cameras, digital still cameras, cellular telephones, etc., used in combination with a microcontroller. Functions • Charge/discharge: In charge/discharge mode, switch external power MOSFETs on to charge the battery or discharge it to set load. • Charge detection: Detect the charge status of lithium-ion batteries with comparator. • Charge completion control: When charging of the lithium-ion battery is completed, the comparator is activated and the external power MOSFETs are switched off to stop charging. • Countercurrent detection and control: In systems that support charging of both the set of the video camera, etc., and the AC adapter/charger, when spare batteries are charged on the AC adapter/charger side, if the battery voltage on the set side becomes high when the set is connected to the AC adapter/charger, current flows out to the battery on the AC adapter/charger side. These ICs feature a function that prevents this from happening. • Charge prevention: A specified voltage is applied to the CHARGEINH pin to stop charging. Features • The combination of a microcontroller and external power MOSFETs enables easy charge/discharge control of lithium-ion batteries. • Small power dissipation makes these ICs suitable for sets that require long time operation • Use of compact package makes these ICs suitable for compact sets. • Large power supply operation range supports both 1-cell and 2-cell lithium-ion batteries. Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 31000RM (OT) No. 5640-1/6 LA5621M, 5621V Package Dimensions unit: mm unit: mm 3034A-MFP14 3178-SSOP16 16 9 0.5 6.4 4.4 4.4 5.15 6.4 8 1.0 [LA5621V] 0.625 [LA5621M] 14 1.8max 7 0.15 1 8 5.4 0.15 0.1 0.1 1.5 10.1 1.6max 1 1.27 0.35 1.24 0.22 SANYO: MFP14 0.43 0.65 SANYO: SSOP16 Specifications Maximum Rating at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings VCC max Pd max LA5621M LA5621V Unit 11 V 320 mW 250 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +125 °C Ratings Unit Allowable Operating Conditions at Ta = 25°C Parameter Symbol Conditions Supply voltage 1 VCC1 VCC1 ≤ VCC2 1 to 11 V Supply voltage 2 VCC2 VCC1 ≤ VCC2* 2 to 5.5 V Note: * When VCC1 < 2 V, only the gate block (external power MOSFET drive) operates. Electrical Characteristics at Ta = 25°C, VCC1 = 5.5 V, VCC2 = 3.15 V (unless otherwise specified) Parameter Symbol Conditions Ratings min typ Unit max Current drain 1-1 (During set operation discharge) ICC1-1 VCC1 in current, VCHG = VCC2, SW4, 6: on, SW5: off 90 120 µA Current drain 2-1 (During set operation discharge) ICC2-1 VCC2 in current, VCHG = VCC2, SW4, 6: on, SW5: off 20 26 µA Current drain 1-2 (During charging outside set) ICC1-2 VCC2 in current, VCHG = VCC2, SW4, 5: on 20 26 µA Current drain 2-2 (During charging) ICC2-2 VCC2 in current SW5: on, VCPU: L, VGATE:H 600 800 µA VCPU-H VIN1– = 15 mV, VIN1+ = 11 mV, VCHG = VCC2, SW4: off, SW5: on [Output pin block] High-level CPU pin 1– VCC2 – 0.15 V VIN1+ VCPU-L VIN = 15 mV, = 23 mV, VCHG = VCC2, SW4: off, SW5: on CPU pin sink current VCPU-SINK VIN1– = 15 mV, VIN1+ = 23 mV, VCHG = VCC2, SW4: off, SW5: on High-level BIAS1 pin VBIAS1-H SW1, 2, 5, 6: on VCC2 – 0.15 V High-level BIAS2 pin SW1, 2, 5, 6: on, VIN2- = 15 mV, VBIAS2-H VIN2+ = 11 mV VCC2 – 0.15 V Low-level BIAS2 pin leak current IBIAS2-LK Low-level CPU pin SW1, 2, 5, 6: on, VIN1– = 15 mV, VIN1+ = 23 mV 0.2 35 V µA 10 µA Continued on next page. No. 5640-2/6 LA5621M, 5621V Continued from preceding page. Parameter Symbol Conditions Ratings min typ Unit max [FET drive block] Drive high-level voltage VGATE-H Same as current drain 1-1 Drive low-level voltage VGATE-L SW6: on, Same as current drain 1-2 5.3 5.4 0.1 V 0.2 V [Comparator block] SW1, 2, 5, 6: on Input offset voltage 1 VIO1 Comparator 1, when CPU voltage is reversed –3 +2 +7 mV Input offset voltage 2 VIO2 Comparator 2, when BIAS2 voltage is reversed –3 –1 +1 mV Input offset voltage 3 VIO3 Total temperature, comparator 2 –5 +3 mV Input offset current IIO Comparators 1, 2 Input bias current IIB Comparators 1, 2 In-phase input voltage range VICR Comparators 1, 2 Input current during negative voltage application ILIM Comparators 1, 2 non-reversed input block only, SW3: on 5 –250 50 –25 nA nA VCC2 – 1.5 –1.5 V mA [Input pin block] VIN1– = 15 mV, VIN1+ = 23 mV, VIN2– = 15 mV, VIN2+ = 23 mV CHARGE pin threshold voltage VCHG-TH SW1, 2, 5, 6: When on, BIAS2 voltages are reversed CHARGE pin input bias current 1 ICHG-BI1 Current during threshold voltage ICHG-BI2 VCHARGE = VCC2 CHARGE pin input bias current 2 CHARGE-INH pin open voltage VCH-IN-OP SW1, 2, 5, 6: on CHARGE-INH pin threshold voltage VCH-IN-TH SW1, 2, 5, 6: When on, BIAS2 voltages are reversed CHARGE-INH pin low-level input current ICH-IN SW1, 2, 5, 6: on BATT/EXT pin open voltage VBA/EX-OP SW1, 2, 6: on BATT/EXT pin threshold voltage VBA/EX-TH SW1, 2, 6: When on, BIAS2 voltages are reversed BATT/EXT pin low-level input current VBA/EX SW1, 2, 5, 6: on 0.5 55 70 1.2 V 10 µA 85 µA VCC2 0.7 V 1.3 –30 VCC2 1.45 –30 V µA V 2.05 V µA Handling Cautions Observe precautions when handling these ICs because they are electrostatic sensitive devices. Pin Assignment No. 5640-3/6 LA5621M, 5621V Pin Functions Pin No. Pin name Function LA5621M LA5621V 1 1 BIAS1 Resistor connection pin for setting non-reversed input potential of comparator 1 2 2 VIN1–* Reversed input of comparator 1 (for charge current detection) 3 3 VIN1+* Non-reversed input of comparator 1 (for charge current detection) 4 4 CPU 5 5 BIAS2 Resistor connection pin for setting non-reversed input potential of comparator 2 6 6 VIN2–* Reversed input of comparator 2 (for countercurrent detection when 2 batteries are used) 7 7 VIN2+* — 8 NC — 9 NC 8 10 GND 9 11 CHARGE Microcontroller signal input pin Non-reversed input of comparator 2 (for countercurrent detection when 2 batteries are used) No connection No connection Substrate of this IC (Lowest potential) Charging signal input pin, charge with low Charge prohibition signal input pin, charge prohibition with low (becomes low during discharge mode for lithium-ion battery that set operates on) 10 12 CHARGE INH 11 13 BATT/EXT 12 14 VCC2 13 15 GATE Gate connection pin of external power MOSFETs 14 16 VCC1 Lithium-ion battery + side input pin On/off control pin of this IC, except Gate block (becomes "Open" during discharge mode for lithium-ion battery that set operates on) Power supply input Note: * If negative voltage is applied due to countercurrent, etc., up to 1.5 mA can be allowed. Allowable power dissipation, Pd max — W Specified Test Circuit Operating temperature, Ta — °C No. 5640-4/6 FW201 or FW203 equivalent Charge current Discharge current Load The charging conditions of the secondary battery to be used must be set according to the battery specifications. The peripheral circuit constants must be set taking into consideration the specifications of the power MOSFETs. Microcontroller use conditions must be carefully studied. Application Cautions: Countercurrent detection Charge detection Charging/ Discharge mode Secondary lithium-ion battery Plug/SW Clock, timer, CPU, backup Set, internal side VBAT2 < < VBAT1 Power supply for charging External charge adapter • Discharge/During set use, power MOSFETs are simply switched ON. Countercurrent from set to adapter VBAT2 > VBAT1 • Full charging on set side; Discharge on adapter side → Normal charging • Charging following internal battery use (OFF when plug is inserted) (ON when plug is inserted) External wire bound Secondary lithium-ion battery LA5621M, 5621V Equivalent Circuit Block and Sample Peripheral Circuit No. 5640-5/6 LA5621M, 5621V Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of March, 2000. Specifications and information herein are subject to change without notice. PS No. 5640-6/6