2 to 5 Serial Cell Li-Ion / Li-Polymer Battery Protection IC for Secondary Protection

Transcription

1 Series 2 to 5 Serial Cell Li-Ion / Li-Polymer Battery Protection IC for Secondary Protection OUTLINES The R5434D is an overcharge protection IC for 2 to 5 serial Li-ion/Li-polymer secondary battery. When an overcharge is detected, after the IC internally fixed delay time, the output of becomes "H". After detecting the overcharge, when the cell voltage becomes lower than the overcharge release voltage, the overcharge state is released. By forcing +3.0 or more to the pin, the test time of protection circuit board can be shortened, and overcharge delay time becomes about 1/30. The output type is CMOS. FEATURES Manufactured with High oltage Tolerant Process Absolute Maximum Rating 30 Low Supply Current Cell oltage 3.9, for 5-cell Typ. 3.0µA High-accuracy Detector Threshold Overcharge Detector ±25m (Ta=25 C) ariety of Detector Threshold Overcharge Detector Threshold (DET1n (1) ) (in 5m step) Overcharge Release oltage (REL1n (1) ) DET1n to DET1n (in 50m steps) Overcharge Detector Output Delay Typ.1.5s Overcharge Released Condition oltage Released Type 2 to 5 Cells Selectable Protection Output (CMOS Output, Active-high) Typ. 3.7 ( Low at normal times, High at detecting times) Overcharge Delay Time Shortening Function with pin +3.0 or more 1sec to about 1/ to -2.0 about 4ms. Small Package SON-8 APPLICATIONS Li-ion or Li-polymer Battery Protection (1) DET1n, REL1n : n =1, 2, 3, 4, 5 1

2 SELECTION GUIDE The overcharge and the delay time are user-selectable options. Selection Guide Product Name Package Quantity per Reel Pb Free Halogen Free R5434Dxxx$ -TR -FE SON-8 5,000 pcs Yes Yes xxx: Specify the combination of the overcharge detector threshold (DET1n) and the overcharge release voltage (REL1n) (1). DET1n (2) : 3.6 to 4.6 in 5 m step REL1n (2) : DET1n 0.1 to DET1n 0.4 in 50 m step $: Specify the delay time option. A: Overcharge Detection Delay Time (tdet1) : 1.5s : Specify the overcharge release option. A: oltage Released Type Product Code List The product code is determined by the combination of the set output voltage (overcharge detection voltage: DET1n, overcharge release voltage: REL1n), the delay time (overcharge detection delay time: tdet1), and the overcharge release options. Overcharge Detection Set oltages () Product Code Delay Time (s) Overcharge Released Type DET1n REL1n t DET1 R5434D401AA oltage Release R5434D402AA oltage Release R5434D403AA oltage Release R5434D404AA oltage Release R5434D405AA oltage Release (1) Refer to Product Code Table for details. (2) DET1n, REL1n: n = 1, 2, 3, 4, 5 2

3 BLOCK DIAGRAM D1-1 C2 D1-2 Regulator Regulator Logic Circuit Logic Circuit C3 D1-3 Oscillator DS Circuit Counter C4 D1-4 Regulator C5 D1-5 SS R5434DxxxAA Block Diagram 3

4 PIN DESCRIPTION SON-8 Top iew Bottom iew Pin No. Symbol Description 1 C5 Positive terminal pin for Cell-5 2 C4 Positive terminal pin for Cell-4 3 C3 Positive terminal Pin for Cell-3 4 C2 Positive terminal pin for Cell-2 5 pin, positive terminal pin for Cell-1 6 control pin / Output delay time shortening pin 7 Output pin of overcharge detection, CMOS output 8 SS SS pin. Ground pin for the IC The tab suspended leads are connected to the GND level. Do not short or wire those parts to other voltage level parts. 4

5 ABSOLUTE MAXIMUM RATINGS (Ta = 25 C, SS = 0) Symbol Item Ratings Unit Supply voltage (Positive terminal pin voltage of Cell-1) -0.3 to 30 C2-0.3 to C2+6.5 C2 Positive input pin voltage for Cell-2 C3-0.3 to C3+6.5 C3 Positive input pin voltage for Cell-3 C4 0.3 to C4+6.5 C4 Positive input pin voltage for Cell-4 C5 0.3 to C5+6.5 C5 Positive input pin voltage for Cell to 6.5 pin voltage -0.3 to 30 pin output voltage -0.3 to OH1+0.3 PD Power Dissipation (1) 480 mw Tj Junction Temperature Range -40 to 125 C Tstg Storage Temperature Range -55 to 125 C ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITION Symbol Item Rating Unit Operating Input oltage 4.0 to 25 Ta Operating Temperature Range 40 to 85 C RECOMMENDED OPERATING CONDITIONS All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. (1) Refer to POWER DISSIPATION in SUPPLEMENTSRY ITEMS for detail information. 5

6 ELECTRICAL CHARACTERISTICS CELLn = CELLn (Ex. CELL1 is a voltage difference between and C2), n = 1, 2, 3, 4, 5, unless otherwise noted. The specifications surrounded by are guaranteed by Design Engineering at 0 C Ta 60 C. R5434DxxxAA Electrical Characteristics (Ta = 25 C) Circuit Symbol Item Conditions Min. Typ. Max. Unit DET1n REL1n tdet1 trel1 tdtr1 IH-1 IH-2 IM IL OL CELLn Overcharge Detection Threshold CELLn Overcharge Release oltage Overcharge Detection Delay Time Overcharge Release Delay Time Overcharge Detection Timer Reset Delay Time Pin "High1" Input oltage CILC Pin "High2" Input oltage Pin "Middle" Input oltage Pin "Low" Input oltage Nch. ON oltage Pch. ON oltage1 (at no load) Pch. ON oltage Detect rising edge of supply voltage (25 C) Detect rising edge of supply voltage (0 to 60 C) Detect falling edge of supply voltage CELLn=3.5 (n=2,3,4,5), CELL1=3.5 to 4.5, CELLn=3.5 (n=2,3,4,5), CELL1=4.5 to 3.5, CELLn=DET1n to REL1n to DET1n to REL1n DET1n DET1n REL1n DET1n DET1n REL1n DET1n DET1n REL1n s B ms B ms B SS (1) A A C C C 0.5 D IOL=50μA, CELLn= 3.5, = E IOH = 0μA, CELLn = 3.5, = SS F IOH= -50μA, OH1 OH1 CELLn = 3.5, = SS G ISS Supply Current CELLn= µa H OH1 OH (1) Refer to TEST CIRCUITS for detail information. 6

7 7 TEST CIRCUITS A C2 C3 C4 SS OSCILLOSCOPE C5 B C2 C3 C4 SS OSCILLOSCOPE C5 C C2 C3 C4 SS OSCILLOSCOPE C5 D C2 C3 C4 SS OSCILLOSCOPE C5 F C2 C3 C4 SS C5 E C2 C3 C4 SS C5 G C2 C3 C4 SS C5 H C2 C3 C4 SS C5 A

8 THEORY OF OPERATION Overcharge Detectors, DET1n (n=1, 2, 3, 4, 5) While the cells are charged, the voltage between pin and C2 pin (voltage of the Cell-1), the voltage between C2 pin and C3 pin (voltage of the Cell-2), the voltage between C3 pin and C4 pin (voltage of the Cell-3), the voltage between C4 pin and C5 pin (voltage of the Cell-4), and the voltage between C5 and SS pin (voltage of the Cell-5) are supervised. If at least one of the cells voltage becomes equal or more than the overcharge detection voltage, the overcharge is detected, and an external charge control Nch. FET turns ON with pin being at "H" level and by cutting off a fuse on the charger path, and the charge operation stops. To reset the overcharge and make the pin level to "Low" again after detecting overcharge, in such conditions that a time when all the cells voltages are down to a level lower than overcharge release voltage. Internal fixed output delay times for overcharge detection, overcharge detector timer reset, release from overcharge exist. Even if one of voltage of the cells keeps its level more than the overcharge detection voltage, and output delay time passes, overcharge voltage is detected. If all the cell voltages become lower than the overcharge detection voltage within the overcharge detection delay time by noise or other reasons, the time period is less than overcharge detector timer reset output delay time, the overcharge delay time is accumulated and maintained, and the accumulated delay time reaches the overcharge delay time, the overcharge is detected. After detecting overcharge, even if all the cell voltages become equal or less than the release voltage from overcharge, if at least one of the cells voltage becomes higher than the release voltage from overcharge within the overcharge release delay time from overcharge, then overcharge is not released. The output type of the pin is a CMOS output between SS and the built-in regulator, and "High" level of pin is the output voltage of the built-in regulator. 8

9 Connect Charger Connect Load CELL1 DET11 REL11 CELL2 t DET12 REL12 CELL3 t DET13 REL13 CELL4 t DET14 REL14 CELL5 t DET15 REL15 + t tdet1 tdet1 trel1 trel1 SS Charge/Discharge Current Charge Current 0 Discharge Current Overcharge Operation Timing Chart t t 9

10 Delay Shortening (DS) Function The pin is forcibly set to "High" output with applying the SS level voltage to the pin. By applying +3.0 or more voltage to the pin, the overcharge detect and release delay times can be shorten into approximately 1/30. (DS mode 1) By applying the voltage in the range from 2.0 to -2.0 to pin, the overcharge detect delay time can be shorten into approximately 4ms. (DS mode 2) The pin has internally the input delay time (approximately 1ms). Table. Pin Input Conditions and IC s Operating Conditions ( DD 4.0 ) Input Conditions to Pin IC Operating Conditions +3.0 or more DS mode to +0.3 Normal operation 2.0 to -2.0 DS mode 2 SS-0.3 to 0.5 output "H" Open Indefinite Setting for 2 to 4 Cell Protection By short-circuiting between cells, the R5434D can meet as a protection IC for 2, 3, or 4 cells placed in series. The following table indicates pins to short-circuit to SS depending on protected cells. Protected Cells Pins to Short-circuit to SS 2-cell protection C3, C4, and C5 pins 3-cell protection C4 and C5 pins 4-cell protection C5 pin If providing other connections except above short-circuit for 2, 3, or 4 cells protection, perform thorough evaluation using the actual devices. 10

11 TYPICAL APPLICATIONS Typical Application Circuits SC PROTECTOR R1 CELL1 R2 C1 C2 CELL2 R3 C2 C3 CELL3 CELL4 R4 R5 C3 C4 C4 C5 R5434D Normal Output: L H Active CELL5 C5 SS 5-cell Protection Circuit SC PROTECTOR R1 CELL1 R2 C1 C2 CELL2 R3 C2 C3 CELL3 R4 C3 R5434D CELL4 C4 C4 C5 Normal Output: L H Active SS 4-cell Protection Circuit 11

12 SC PROTECTOR R1 CELL1 R2 C1 C2 CELL2 R3 C2 C3 CELL3 C3 R5434D C4 C5 Normal Output: L H Active SS 3-cell Protection Circuit SC PROTECTOR R1 CELL1 R2 C1 C2 CELL2 C2 C3 C4 C5 R5434D Normal Output: L H Active SS 2-cell Protection Circuit 12

13 External Components Symbol Min. Typ. Max. Unit R1 / R2 / R3 / R4 / R Ω C1 / C2 / C3 / C4 / C µf Technical Notes on Selection Components The voltage fluctuation is stabilized with R1 to R5 and C1 to C5. If a R1 to R5 is too large, by the conduction current at detection, the detector threshold may shift higher. Therefore, the appropriate value range of R1 to R5 is equal or less than 1kΩ. To make a stable operation of the IC, the appropriate value range of C1 to C5 is 0.01µF or more. The typical application circuit diagrams are just examples. This circuit performance largely depends on the PCB layout and external components. In the actual application, fully evaluation is necessary. Overvoltage and the over current beyond the absolute maximum rating should not be forced to the protection IC and external components. During the time until the fuse is open after detecting overcharge, a large current may flow through the FET. Select an FET with large enough current capacity in order to endure the large current. To connect the SC protector, connect the SC protector to the cell must be the last. Contact Information for Inquiries regarding SC PROTECTOR Dexerials Corporation (Sony Chemical & Information Device Company Ltd.) Gate-city Osaki East Tower 8F, Osaki, Shinagawa, Tokyo, TEL: URL: 13

14 TYPICAL CHARACTERISTICS s. Temperature 1) CELLn Overcharge Detector Threshold vs. Temperature 4.35 R5434D401AA n=1, 2, 3, 4, 5 CELLn =3.2 2) CELLn Overcharge Release oltage vs. Temperature 4.05 R5434D401AA n=1, 2, 3, 4, 5 CELLn = DET1n () REL1n () Ta ( ) Ta ( ) 3) Overcharge Detection Delay Time vs. Temperature t DET1 (sec) R5434D401AA Ta ( ) n=1, 2, 3, 4, 5 CELLn =3.5 CELL1 = ) Overcharge Release Delay Time vs. Temperature t REL1 (msec) R5434D401AA Ta ( ) n=1, 2, 3, 4, 5 CELLn =3.5 CELL1 =

15 5) Timer Reset Delay Time vs. Temperature 6) Nch. ON oltage vs. Temperature t TR1 (msec) R5434D401AA n=1, 2, 3, 4, 5 CELLn =3.5 CELL1 = OL () R5434D401AA n=1, 2, 3, 4, 5 CELLn =3.5 CELL1 = Ta ( ) 7) Pch. ON oltage vs. Temperature (at No Load) OH1 () R5434D401AA CELLn =3.5 I LOAD =0µA Ta ( ) n=1, 2, 3, 4, 5 Ta ( ) 8) Pch. ON oltage vs. Temperature OH - OH1 () R5434D401AA n=1, 2, 3, 4, 5 CELLn =3.5 I LOAD =-50µA Ta ( ) 9) Supply Current vs. Temperature R5434D401AA n=1, 2, 3, 4, 5 CELLn =3.9 Iss(uA) Ta ( ) 15

16 Output Delay Time vs. Supply oltage ( DD) Dependence 1) Overcharge Detection Delay Time vs. 2) Overcharge Release Delay Time vs. t DET1 (sec) R5434D401AA CELL1 =0.4, 1.6, 2.4, 3.2, CELLn () n=1, 2, 3, 4, 5 trel1 (msec) R5434D401AA CELL1= CELLn () n= Supply Current vs. DD (for 5 Cells Protection) SC PROTECTOR Supply Current[uA] [] CELL1 CELL2 CELL3 CELL4 CELL5 A R1 1kΩ R2 1kΩ R3 1kΩ R4 1kΩ R5 1kΩ C1 0.1µF C2 0.1µF C3 0.1µF C4 0.1µF C5 0.1µF C2 C3 C4 C5 SS R5434D Normal Output: L H Active Test Circuit 16

17 s. External Resister dependence Overcharge Detection oltage / Overcharge Release oltage vs. R1 DET11 REL DET11() REL11() R1(Ω) SC PROTECTOR CELL1 R1 R2 C1 0.1uF C2 CELL2 1kΩ R3 C2 0.1uF C3 CELL3 CELL4 1kΩ R4 1kΩ R5 C3 0.1uF C4 0.1uF C4 C5 R5434D Normal Output: L H Active CELL5 1kΩ C5 0.1uF SS Test Circuit 17

18 POWER DISSIPATION SON-8 The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following conditions are used in this measurement. er. A Measurement Conditions Environment Board Material Board Dimensions Copper Ratio Through-holes Standard Test Land Pattern Mounting on Board (Wind elocity = 0 m/s) Glass Cloth Epoxy Plastic (Double-Sided Board) 40 mm 40 mm 1.6 mm Top Side: Approx. 50% Bottom Side: Approx. 50% f 0.5 mm 44 pcs Measurement Result (Ta = 25 C, Tjmax = 125 C) Standard Test Land Pattern Free Air Power Dissipation 480 mw 300 mw Thermal Resistance qja = ( C) / 0.48 W = 208 C/W 333 /W 600 Power Dissipation PD (mw) Standard Test Land Pattern Free Air Ambient Temperature ( C) IC Mount Area (mm) Power Dissipation vs. Ambient Temperature Measurement Board Pattern i

19 PACKAGE DIMENSIONS SON-8 er. A 2.9± TYP ± ± ± MAX 3.0± ± ± ± ± M * SON-8-18 Package Dimensions (Unit: mm) * The tab suspension leads on the bottom of the package is substrate level (GND). It is recommended that the tab suspension leads be connected to the ground plane on the board, or otherwise be left floating. Also, the tab suspension leads should not connect to other wires or land patterns. i

20 Halogen Free Ricoh is committed to reducing the environmental loading materials in electrical devices with a view to contributing to the protection of human health and the environment. Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since April 1,