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Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Block diagram Charge current setting BAT ISET Input Current Limit VINSPM IN ILIM IN ChargePump Vin System-path Management UVLO OVP BAT+VIN(DET) TSD OSC for Charger TMR OUT OCD DSW AC/USB Detection SDA SCL Logic SYSOFF Pre-Charge Fast Charge BAT removal VREF TS ITERMITERM setting VREF Reference IN GND IN IN IN BAT BAT VUVLO VOVP BAT+VIN(DET) VPRE VFST CC CV Thermal Regulation Vout Battery -path Management Battery Support Charge control Recharge BAT VRECHG VREF INGOOD CHG SAL System-path Battery-path OUTGOOD Powerd by BAT VOG BAT OUTGOOD OUT BAT-VSUP OUT VOUTBPM Tj (TSD) Tj BAT V BAT I CHG I SET
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Pin assinmet Pin No. Function A1 IN A2 ILIM A3 D– A4 D+ A5 GND B1 INGOOD B2 OCD B3 DSW B4 SAL B5 OUTGOOD OUT C3 ISET C4 SDA C5 TMR BAT D3 TS D4 SCL D5 CHG E3 VREF E4 SYSOFF E5 ITERM (TOP VIEW) A B C D E index mark
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Pin Description Pin No. Symbol Function A1 IN Power supply input pin that connects AC adaptor or USB. A2 ILIM System-path current limit setting. Connect a resistor between this pin and GND. A3 D- USB bus D- input. A4 D+ USB bus D+ input. A5 GND Ground pin. B1 INGOOD Input OK indicator. NchMOS open drain output. B2 OCD Default System-path current limit setting when USB detected. Input H/L. B3 DSW Control pin for external USB signal switch. Inverter output. B4 SAL I2C alarm indicator. NchMOS open drain output. B5 OUTGOOD Output OK indicator. NchMOS open drain output. OUT System-path output pin. Output power to the system. C3 ISET Charge current setting pin. Connec a resistor between this pin and GND. C4 SDA I 2C data input and output pin. C5 TMR Oscillator frequency setting pin for the charge timer. Connect a capacitor between this pin and GND. BAT Li-ion battery connection pin. Charging to Li-ion battery and discharging to OUT pin. D3 TS Thermistor input pin. Connect the terminal of the battery pack thermistor. D4 SCL I2C clock input pin. D5 CHG Charge status indicator. NchMOS open drain output. E3 VREF Battery thermistor reference voltage output. Connect TS pin through a resistor. E4 SYSOFF Turn off System-path. Input H/L. E5 ITERM End-of-charge current setting pin. Connect a resistor between this pin and GND.
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Absolute Maximum Ratings (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Ratings Units Operating ambient temperature(*2) Topr −40 〜 +85 ℃ Junction temperature Tj −40 〜 +125 ℃ IN pin input voltage VHin 4.35 〜 5.5 V Other pin input voltage Vin 0 〜 5.5 V ILIM setting resistance RILIM 40 〜 400 kΩ ISET setting resistance RISET 53.33 〜 400 kΩ ITERM setting resistance RITERM 40 〜 400 kΩ TMR setting capacitor CTMR 5 〜 50 nF (*2) Board size ： 80mm × 70mm × 1.6mm Material ： grass epoxy Layer ： 2Layers Wire rate ： 90% Recommended Operation Conditions (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Ratings Units Storage temperature Tstg −55 〜 +150 ℃ Junction temperature TjMAX −40 〜 +150 ℃ IN pin input voltage VHinMAX −0.3 〜 +24 V Other pin input voltage VinMAX −0.3 〜 +6.0 V IN pin input current IINMAX 〜 2.0 A OUT pin output current IOUTMAX 〜 5 A BAT pin input and output current IBATMAX 〜 5 A Power dissipation(*1) Pd 〜 1.0 W (*1) Board size ： 80mm × 70mm × 1.6mm Material ： grass epoxy Layer ： 2Layers Wire rate ： 90%
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00
Electrical Characteristics
(Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units POWER SUPPLY INPUT Consumption current 1 Icc IN=5V, SYSOFF="L" IN pin input current 1.2 2.0 mA Consumption current 2 IccOFF IN=5V, SYSOFF="H" IN pin input current 300 500 uA Consumption current 3 IccBAT BAT=4.2V, IN=0V BAT pin input current 4 10 uA Under voltage lock-out VUVLO IN=L → H 3.1 3.2 3.3 V Hysteresis on VUVLO(*3) VUVLOhys IN=H → L 100 mV Overvoltage protection VOVP IN=L → H 5.6 5.7 5.8 V Hysteresis on VOVP(*3) VOVPhys IN=H → L 175 mV Input power detection voltage VIN(DET) BAT=3.6V, IN=L → H Input power detect when IN ≧ BAT+VIN(DET) 50 80 130 mV Hysteresis on VIN(DET)(*3) VIN(DET)hys BAT=3.6V, IN=H → L 20 35 50 mV Input power detection deglitch time(*3) tDGL(IN) Time measured from IN=0 → 5V(1us rise-time) to INGOOD="L" 1.0 ms Overvoltage blanking time(*3) tDGL(OVP) 50 us OVP recovery deglitch time(*3) tDGL(REC) Time measured from IN=10 → 5V(1us fall-time) to INGOOD="L" 1.0 ms Input power loss to OUT turn-off delay time(*3) t DELAY BAT=3.6V Time measured from IN=5 → 3V(1us fall-time) to INGOOD="H" 10 ms Thermal shutdown temperature(*3) Tj(TSD) Tj=L → H 150 ℃ Hysteresis on Tj(TSD)(*3) Tj(TSD)hys Tj=H → L 30 ℃ (*3) Guaranteed by design
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units SYSTEM-PATH ・ BATTERY-PATH Input current limit ILIM1 OUT=3.6V 80 90 100 mA ILIM2 OUT=3.6V 450 475 500 mA ILIM3 OUT=3.6V KILIM /RILIM A ILIM setting current range(*4) ILIM(RNG) 200 1,500 mA ILIM setting factor KILIM ILIM3=1A 72,000 80,000 88,000 AΩ ON resistance of System-path(*4) RON(SYS) 200 300 mΩ ON resistance of Battery-path(*4) RON(BAT) 50 75 mΩ Voltage of input current limit operation VINSPM 4.35 4.50 4.63 V OUT pin short detection voltage VOUT(SC) 0.8 0.95 1.1 V Battery support voltage(*4) VSUP VSUP=OUT-BAT when Battery support mode BAT=3.8V 150 300 mV (*4) Guaranteed by design (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units CHARGE CONTROL Initialize time(*5) tINIT 1clk=TOSC 2 clk Fast charge current setting range(*5) ICHG(RNG) This is applied to “1 of ISET” 200 1,500 mA Fast charge current I FSTCHG This is applied to “1 of ISET” K ISET /RISET A Fast charge current setting factor KISET RISET=160k ICHG ≧ 200mA 76,000 80,000 84,000 AΩ Fast charge current accuracy @small currentIACC RISET=160kΩ ICHG ＜ 200mA −10 +10 mA Pre-charge current IPRECHG KPRECHG /RISET A Pre-charge current setting factor KPRECHG RISET=160kΩ 6,000 8,000 10,000 AΩ Relief charge current IRELCHG 4 8.5 13 mA End-of-charge current setting range(*5) I TERM(RNG) USB 500mA or ILIM mode 20 200 mA USB 100mA mode 6.7 66.7 mA End-of-charge detection current ITERM KITERM /RITERM A End-of-charge detection current setting factor K ITERM USB 500mA or ILIM mode RITERM=160kΩ 6,000 8,000 10,000 AΩ USB 100mA mode RITERM=160kΩ 2,000 2,667 3,333 AΩ End-of-charge detection deglitch time(*5) t DGL(TERM) 1clk=TOSC 8 clk BAT pull current(*5) IPULL 80 mA BAT pull time(*5) tBAT(DET) 32 ms (*5) Guaranteed by design
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (Except where noted otherwise: Ta=25℃ , IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units Start voltage of pre-charge VPRE BAT=L → H 1.9 2.0 2.1 V Hysteresis on VPRE(*6) VPREhys BAT=H → L 100 mV Start voltage of fast-charge VFST BAT=L → H 2.7 2.8 2.9 V Hysteresis on VFST(*6) VFSThys BAT=H → L 100 mV Pre-charge to fast charge transition deglitch time(*6) tPTOF 1clk=TOSC 16 clk Constant voltage control (VBAT1>VBAT2>VBAT3>VBAT4) VBAT1 4.17 4.20 4.23 V VBAT2 4.12 4.15 4.18 V VBAT3 4.07 4.10 4.13 V VBAT4 4.02 4.05 4.08 V Voltage of recharge detection VRECHG VBAT -0.20V V Voltage of charge current limit operation V OUTBPM 4.15 4.20 4.25 V Thermal regulation temperature(*6) Tj(REG) 85 100 115 ℃ (*6) Guaranteed by design
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units BATTERY TEMPERATURE DETECTION VREF pin output voltage VREF 2.74 2.80 2.86 V VREF pin source current ability IREF Decrease to 98% of VREF 2 mA VREF pin leakage current IVREF(LEAK) VREF=3.1V 1 uA Battery removal detection TS pin voltage V TBR TS=L → H 85.0 90.0 95.0 %VREF Battery temperature detection TS pin voltage when I2C 05h b07= "0" VT10 T1 detection TS=L → H 76.6 78.1 79.6 %VREF VT20 T2 detection TS=L → H 66.2 67.7 69.2 %VREF VT30 T3 detection TS=H → L 27.5 29.0 30.5 %VREF VT40 T4 detection TS=H → L 23.4 24.9 26.4 %VREF VT50 T5 detection TS=H → L 16.7 18.2 19.7 %VREF Battery temperature detection TS pin voltage when I2C 05h b07= "1" VT11 T1 detection TS=L → H 71.6 73.1 74.6 %VREF VT21 T2 detection TS=L → H 62.7 64.2 65.7 %VREF VT31 T3 detection TS=H → L 31.5 33.0 34.5 %VREF VT41 T4 detection TS=H → L 27.9 29.4 30.9 %VREF VT51 T5 detection TS=H → L 21.7 23.2 24.7 %VREF Hysteresis on TS pin voltage detection(*7) V TShys 2 %VREF TS pin leakage current ITS(LEAK) TS=3.1V 1 uA (*7) Guaranteed by design
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units OSCILLATOR Oscillation period TOSC RISET=160kΩ CTMR=15nF 4.2 6.0 7.8 ms Pre-charge timer(*8) TPRE TBASE=TOSC×220 I2C default TBASE s Total charge timer(*8) TTOTAL TBASE=TOSC×220 I2C default ×TBASE s USB DETECTION D+/D− detection time(*8) tDDE 128 ms D+/D− detection-sw release time(*8) tDRE 256 ms Dead time of D+/D−detection(*8) tDSW 1 ms DSW pin sink current ability VDSW(SI) ISINK=1mA when DSW="L" 0.25 V DSW pin source current ability(*8) VDSW(SO) ISOURCE=1mA when DSW="H" 4.50 V Bias at D+ pin(*8) VD+ can source at least 150uA 0.475 0.600 0.700 V D+ pin output current limit(*8) ID+ D+=0V 1.5 mA D−pin sink current(*8) ID- D−=0.5V 10 30 50 uA D+ pin leakage current ID+(LEAK) not in detection mode 1 uA D−pin leakage current ID-(LEAK) not in detection mode 1 uA D+/D− comparator threshold VDC L → H 0.35 0.40 0.45 V D+/D−Hysterisis on VDC(*8) VDChys H → L 42 mV (*8) Guaranteed by design (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units OUTGOOD PIN OUTGOOD threshold VOG BAT=L → H 2.89 2.95 3.01 V Hysterisis on VOG(*9) VOGhys BAT=H → L 0.15 V LOGIC INPUT AND OUTPUT Low level input voltage VL SYSOFF, OCD, SDA, SCL 0.4 V High level input voltage VH SYSOFF, OCD, SDA, SCL 1.5 V Built-in pull-down resistor value RPD SYSOFF, OCD 100 kΩ Open drain pin sink current ability VOPD ISINK=5mA when Pin="L" 0.25 V (*9) Guaranteed by design
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (Except where noted otherwise : Ta=25℃, IN=5V ) Item Symbol Measurement conditions Min. Typ. Max. Units I2C BUS Clock frequency fSCL 10 400 kHz Data transfer wait time(*10) tBUF 1.3 us SCL start hold time(*10) tHD;STA 0.6 us SCL low level hold time(*10) tLOW 1.3 us SCL high level hold time(*10) tHIGH 0.6 us Start condition setup(*10) tSU;STA 0.6 us SDA data hold time(*10) tHD;DAT 100 ns SDA data setup time(*10) tSU;DAT 100 ns SDA,SCL rise time(*10) tR 300 ns SDA,SCL fall time(*10) tF 300 ns Stop condition setup time(*10) tSU;STO 0.6 us (*10) Guaranteed by design tBUF t HD;STAP S t LOW t R t F t HD;DAT t HIGH t SU;DAT t SU;STA Sr Pt SU;STO
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (1) ABOUT I2C BUS I2C BUS is inter bus system controlled by 2 lines (SDA,SCL). Data are transmitted and received in the units of byte and Acknowledge. It is transmitted by MSB first from the Start condition. The data format is set as shown in the following figure. Function SCL SDA SDA SA6 Start condition 1byte Data Write SA0 RA0RA7 D0D7 HiZHiZ HiZ HiZ HiZ HiZ HiZ Slave Address (7bit) [1001 010] Write Slave Ack Slave Ack Slave Ack Stop condition Register Address (8bit) Register Data (8bit) @Master @Slave n bytes Data Write SCL SDA SDA SA Start condition SA RA RA
7 D0D7
(7bit) [1001 010] Write Slave Ack Slave Ack Slave Ack Stop condition Register Address (8bit) Register Data (8bit) (Address +0) D0D7HiZ HiZ Slave Ack Register Data (8bit) (Address +1) D0D7 HiZ Register Data (8bit) (Address +n-1) @Master @Slave SCL SDA SDA SA Start condition n bytes Data Read SA RA RA D0D7HiZHiZ HiZ HiZ Slave Address (7bit) [1001 010] Write Slave Ack Slave Ack Master Ack Register Address (8bit) Register Data (8bit) (Address +0) SA SA HiZ Slave Address (7bit) [1001 010] Read Slave Ack Start condition HiZ D0D7 Register Data (8bit) (Address +1) HiZ Master No Ack HiZ D0D7 Register Data (8bit) (Address +n-1) HiZ HiZ Stop condition @Master @Slave SCL SDA SDA SA Start condition 1byte Data Read @Master @Slave SA RA RA D0D7HiZHiZ HiZ HiZ HiZ Slave Address (7bit) [1001 010] Write Slave Ack Slave Ack Master No Ack Stop condition Register Address (8bit) Register Data (8bit) SA SA HiZ Slave Address (7bit) [1001 010] Read Slave Ack Start condition HiZ
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (2) I2C REGISTER MAP b07 b06 b05 b04 b03 b02 b01 b00 Slave Address 1 0 0 1 0 1 0 R = 1 W = 0 Register Address 01h CV Setting (T1 〜T2) CV Setting (T2 〜 T3) CV Setting (T3 〜 T4) CV Setting (T4 〜 T5) R/W R/W R/W R/W R/W R/W R/W R/W 02h CC Setting (T1 〜T2) CC Setting (T2 〜 T3) Charge Enable SAL Release R/W R/W R/W R/W R/W R/W R/W W 03h CC Setting (T3 〜T4) CC Setting (T4 〜 T5) USB Current Limit R/W R/W R/W R/W R/W R/W R/W R/W 04h Battery Temperature Charger Time-out Input OVP ILIM Short ISET Short ADP/USB R R R R R R R R 05h NTC Pre-charge Timer Total charge Timer R/W R/W R/W R/W R/W R/W R/W R R : Read Only (Write data is ignored) W : Writable ("0" is returned for read-in) R/W : Readable and Writable (3) I 2C REGISTER EXPLANATION R/W CV Setting (T1 〜T2) R/W CV Setting (T2 〜 T3) 01h b07 b06 V 01h b05 b04 V default 0 0 4.05 default 0 0 4.05 0 1 4.10 0 1 4.10 1 0 4.15 1 0 4.15 1 1 4.20 1 1 4.20 R/W CV Setting (T3 〜T4) R/W CV Setting (T4 〜 T5) 01h b03 b02 V 01h b01 b00 V default 0 0 4.05 default 0 0 4.05 0 1 4.10 0 1 4.10 1 0 4.15 1 0 4.15 1 1 4.20 1 1 4.20 R/W CC Setting (T1 〜T2) R/W CC Setting (T2 〜 T3) 02h b07 b06 b05 of ISET 02h b04 b03 b02 of ISET default 0 0 0 1/8 default 0 0 0 1/8 0 0 1 2/8 0 0 1 2/8 0 1 0 3/8 0 1 0 3/8 0 1 1 4/8 0 1 1 4/8 1 0 0 5/8 1 0 0 5/8 1 0 1 6/8 1 0 1 6/8 1 1 0 7/8 1 1 0 7/8 1 1 1 1 1 1 1 1
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 R/W CC Setting (T3 〜T4) R/W CC Setting (T4 〜 T5) 03h b07 b06 b05 of ISET 03h b04 b03 b02 of ISET default 0 0 0 1/8 default 0 0 0 1/8 0 0 1 2/8 0 0 1 2/8 0 1 0 3/8 0 1 0 3/8 0 1 1 4/8 0 1 1 4/8 1 0 0 5/8 1 0 0 5/8 1 0 1 6/8 1 0 1 6/8 1 1 0 7/8 1 1 0 7/8 1 1 1 1 1 1 1 1 R/W Charge Enable R/W SAL Release 02h b01 Status 02h b00 Status default 0 No charge default 0 Normal
1 Charging 1 Release
03h b01 b00 Maximum input current default 0 0 100mA. USB 100mA mode 0 1 500mA. USB 500mA mode 1 0 ILIM Setting 1 1 Standby(USB suspend mode) R Battery Temperature 04h b07 b06 b05 Status 0 0 0 Battery not connected 0 0 1 〜 T1 0 1 0 T1 〜 T2 0 1 1 T2 〜 T3 1 0 0 T3 〜 T4 1 0 1 T4 〜 T5 1 1 0 T5 〜 R Charger Time-out R Input OVP 04h b04 Status 04h b03 Status
0 Normal 0 Normal
1 Time-out 1 OVP
04h b02 Status 04h b01 Status
1 Short 1 Short
04h b00 Status 05h b07 Status
0 USB Power 0 for NCP15WF104F03RC
1 ADP Power default 1 for NCP15XH103F03RC
R/W Pre-charge Timer R/W Total Charge Timer 05h b06 b05 b04 of TBASE 05h b03 b02 b01 of TBASE default 0 0 0 1 0 0 0 2 0 0 1 2 0 0 1 3 0 1 0 3 0 1 0 4 0 1 1 4 0 1 1 5 1 0 0 5 default 1 0 0 6 1 0 1 6 1 0 1 7 1 1 0 7 1 1 0 8 1 1 1 No timer 1 1 1 No timer
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (4) POWER SUPPLY INPUT MM3538 normal operation starts when all the following conditions are met, and determined that the normal power supply is connected. ① IN ＞ VUVLO ② IN ＞ BAT + VIN(DET) ③ IN ＜ VOVP INGOOD pin is NchMOS open drain output. Open drain MOS is turned on when the normal powersupply is connected. Powerd by BAT BAT VOG OUTGOOD BAT VOG VOG-VOGHYS OUTGOOD L Hi-Z IN VUVLO VUVLO- VUVLOHYS BAT + VIN (DET ) BAT + VIN ( DET ) - VIN (DET ) hys VOVP VOVP- VOVP hys tDGL(IN) tDGL(OVP) t< tDGL(OVP) tDGL(REC) tDELAY INGOOD L Hi-Z When power is not entered, MM3538 has been on the path to the battery to supply power from the battery to OUT pin. (5) OUTGOOD PIN OUTGOOD pin is NchMOS open drain output. When BAT pin voltage becomes higher than 2.95V (=VOG), open drain MOS is turned on. Moreover, this function operates on the voltage from BAT pin. For the reason, it operates by battery only.
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (6) AC ADAPTOR・USB DETECTION An AC adaptor and USB bus have composition as shown in each following figure. MM3538 uses D+ pin / D– pin, judges automatically whether the inputted power supply is an AC adaptor or a USB bus, and operates an input limit. Moreover, a judgment result is displayed on an I2C register (= I2C 04h b00). Detect start tDRE Internal SW DSW OFF ON L H tDSW tDSW Detect end tDDE DSW MM3538USB connector Microcomputer ACadaptor/USB detection Internal SW External SW (a) AC adaptor (b) USB GND<200Ω GND19kΩ ±25% 19kΩ ±25% The internal SW is turned on after a power supply input, and detection is started, and detection is ended in 128ms (= tDDE) after. Furthermore, the inside SW is turned off in 128 ms after (a total of 256 ms (=tDRE)). When the inside SW is ON, a DSW terminal outputs "H". As shown in the following figure, it is used for ON/OFF control of the external SW. MM3538 and other ICs will not be simultaneously connected to a D+/D-line.
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (7) IN CURRENT LIMIT MM3538 restricts the system-path current which flows into IN pin. When detected as USB, the input current limit is set by OCD pin. Then, it can change into other preset values using I2C control. Please refer to another section for OCD pin. When detected as AC adaptor, the input current limit is set by ILIM pin. Then it can’t change into other preset values using I2C control. The setting current by ILIM pin is as follows. (8) OCD PIN When detected as USB by the AC adaptor/USB detection, it is a terminal which sets up the initial value of an input current limit. ・When OCD=”L”, input current limit is set to 100mA. ・When OCD=”H”, input current limit is set to 500mA. Although an initial value is set up with the above-mentioned value, it can be changed into other preset values after that using I2C control. OCD pin is a terminal which sets up an initial value, after power activation, cannot change a preset value by OCD pin. (9) IN pin voltage control System-path management (IN-SPM) MM3538 will decrease an input limit, if IN terminal voltage turns into voltage lower than 4.5V (=VINSPM). Moreover, charge operation is stopped. This function becomes effective only when an input power source is detected as USB, and it prevents crash of USB bus of the host side. (10) SYSOFF PIN It is possible to turn off a system-path compulsorily by making SYSOFF pin into "H". ILIM3 [A] = KILIM3 [A・Ω ] RILIM [Ω ] = 80,000 [A・Ω ] RILIM [Ω ]
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (11) CHARGE CONTROL Charge is started by making ChargeEnable (=I C 02h b01) into "Charging" in the state where there are an input power source and a Li-ion battery. Pre-charge current and Fast charge current will be set up using an ISET pin, and Pre-charge current will be 1/10 of Fast charge current. End-of-charge detection current is set up using ITERM pin. When an input limit is in 100mA mode, End-of-charge detection current is set to one third of the preset values in an ITERM pin. The setting current in ISET pin and ITERM pin is as follows. Charging current is controlled by general CCCV control. However, charging current decreases during CC control at the following factor developmental time. When OUT terminal voltage falls and the charging current limit function operates. When chip temperature rises and the thermal regulation function operates. Charge is suspended when the abnormalities in battery temperature occur. And a charger timer stops. A charge timer stops at this time. When these factors are canceled, charge operation is resumed and a charge timer resumes too. When Pre-charge timer or Total charge timer is time-up, remove power supply or remove battery or make ChargeEnable into “No charge” to reset. CHG pin is NchMOS open drain output. While charging current is flowing, open drain MOS is turned on. ITERM [A] = KITERM [A・Ω ] RITERM [Ω ] = 8,000 [A・Ω ] RITERM [Ω ] IPRECHG [A] = KISET [A・Ω ] 10・RISET [Ω ] = 8,000 [A・Ω ] RISET [Ω ] IFSTCHG [A] 10 = IFSTCHG [A] = KISET [A・Ω ] RISET [Ω ] = 80,000 [A・Ω ] RISET [Ω ]
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Charge Timing Chart Charging Enable No Charge Charging Status Initialaize Charge current BAT voltage tINIT Relief charge Pre- charge Fast charge End- of - charge BAT pull Fast charge (Re-charge) 0mA V PRE V FST VRECHG VBAT - I PULL IRELCHG I TERM IPRECHG I FSTCHG tBAT(DET)tDGL(TERM) Pre- charge (Re- charge) CHG pin L Hi-Z tPTOF tPTOF tDGL(TERM )
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 Charge State Machine Charge timer is paused. When released from Abnormal battery temperature, the count will resume from suspend Initialaize Relief charge Fast chargePre-charge Abnormal battery t INIT over End-of-Charge During the CV control ICHG < I TERM Total charge Timeout VBAT < VRCHG Charging OFF Charging Enable =”Charging” TS<VTBR Power supply input Charging Enable = ”No Charge” BAT pull Pre-Charge Timeout Pre-charge TimeoutBAT< VPRE t BAT (DET ) over VFST < BAT BAT < VFST VTBR < TS Abnormal battery temperature TS< VT5VT1< TS VPRE < BAT VT5<TS< T1V
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (12) CHARGE CURRENT LIMIT When the sum total of OUT pin load current and charging current is larger than an input current limit, OUT pin voltage falls. If OUT pin voltage decreases from 4.2V (=VOUTBPM), charging current will be restricted and the fall of OUT pin voltage will be prevented. Charge status does not become full charge while this function is operating. Even if the charging current limit function operates and it restricts charging current to 0mA, when OUT pin voltage continues falling, the battery support function operates. (13) THERMAL REGULATION If the chip temperature of MM3538 rises during charge operation and it becomes 100℃ (= Tj (REG)), charging current will be restricted and generation of heat will be prevented. Even if the thermal regulation function operates and it restricts charging current to 0mA, if chip temperature continues rising and chip temperature rises to 150℃ (= Tj (TSD)), the thermal shutdown function will operate. (14) THERMAL SHUTDOWN In order to protect MM3538 from thermal destruction, the thermal shutdown circuit is built in, and if chip temperature rises to 150℃ (=Tj(TSD)), it will be in a thermal shutdown state. A system-path is turn off, and a battery-path is turn ON during a thermal shutdown.
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (15) CHARGE TIMER For safety reservation of charge, MM3538 builds in the pre-charge timer and the total charge timer. judges with it being unusual with a timer passing the deadline of, and suspends charge. Charge is suspended when time-up happened. It is as follows during the count of each timer. ・ Pre-charge timer ： Relief charge + Pre-charge ・ Total charge timer ： Relief charge + Pre-charge + Fast charge The clock frequency used by the pre-charge timer and a total charge timer is determined with the resistance of ISET pin and capacity of TMR pin. The time of a pre-charge timer and a total charge timer sets up what time of the obtained base frequency (= TBASE) is used by I2C (=I2C 05h b06~b01). During fast charge, when charging current decreases by operation of a charging current limit function, in roportion to the reduction rate, a clock frequency becomes small. For example, when a fast charge current setup is 500mA and it decreases to 250mA by the above-mentioned factor, a clock frequency is set to one half and, as a result, the time of a charge timer doubles. TBASE [s] = TOSC[s] × 220 TOSC [s] = 2 ・ CTMR [F] 0.8 [V] / RISET [Ω ]
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (16) CHARGE TEMPERATURE PROFILE MM3538 corresponds to the charge temperature profile which JEITA recommends. Each CCCV value can be set up in four (T1~T2, T2~T3, T3~T4, and T4~T5) using I2C (=I2C 01h~03h). Moreover, MM3538 is optimized by the two following kinds of thermo sensitive registers, and can be chosen by I2C (=I2C 05h b07). ① NCP15WF104F03RC (100kohm, 4250K, Murata Manufacturing) ② NCP15XH103F03RC (10kohm, 3380K, Murata Manufacturing) CC = 1 of ISET CC = 0.5 of ISET CV=4.20V CV=4.10V CV=4.05VCharge Voltage at CV -mode Charge Current at CC -mode 10℃ 45℃ 60℃ 50℃ Battery Removal 90% VREF Example of charge temperature profile （CCCV value of T1 ~ T5 can be changed. ） High temp (charge stop)Low temp (charge stop) (17) SAL PIN When the following factor occurs and the contents of the I C register change, a SAL terminal tells you. This pin is a NchMOS open drain output. When the contents of the I C register change, open drain MOS is turned on. ① When battery-temp becomes low-temp (~T1) or high-temp (T5~) (=I C 04h b07~b05) ② When pre-charge timer or total charge timer is time-up (=I C 04h b04) ③ Input overvoltage protection function operates (=I C 04h b03) ④ When ILIM pin short to GND (=I C 04h b02) ⑤ When ISET pin short to GND (=I C 04h b01) After a SAL pin becoming "L", in order to return to H", it is necessary to control SAL Release (=I C 02h b00). While it has been in the state which the above-mentioned factor generated, even if it performs SAL Release, since there is no change in the contents of the I C register, a SAL pin does not react again.
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 (18) BATTERY SUPPORT Although the current load of an OUT terminal is large and the charging current limit function is operating, a battery-path is turned on, if OUT terminal voltage continues falling and it falls from BAT-150~300mV(=V SUP). By this, current will be supplied from both an input power source and a battery, and the fall of OUT terminal voltage is prevented. As an example, the timing chart at the time of the following setup is shown. 【 The example of a setting 】 Charge Current setting = 500mA USB Current limit = 900mA (use ILIM pin) The sum total of I OUT and I BAT becomes larger than 900mA, and V OUT falls by an input limit function. Simultaneously, the charging current limit operates and charging current decreases so that VOUT may not fall. By a charging current limit function, even if it controls charging current to 0mA, when V OUT falls, the battery support function operates and it prevents the fall of VOUT. IOUT IIN IBAT positive: charge negative:discharge VOUT 0mA 500mA 900mA 500mA 0mA -200mA 1100mA 900mA 400mA 5V(=VIN) 4.2V(=VOUTBPM) VBAT-VSUP ① ②
Linear Charger for 1Cell Li-ion Battery with System-path IC MM3538AL
- Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
- The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. 1404-01.00 These circuits are typical examples provided for reference purposes, so in actual applications, the circuit constants, conditions and operations should be thoroughly studied. Mitsumi Electric Co., Ltd. assumes no responsibility for any trouble or damage as a result of the use of these circuits. Mitsumi Electric Co., Ltd. assumes no responsibility for any infringement of industrial property or any other right of a third party or us, as a result of the use of these circuits. Application Circuit 1uF USB connector GND μCOM System Li-ion Battery Thermistor MM3538AL BAT ISET ILIM IN TMR OUT OCD SDA SCL SYSOFF VREF TS ITERM GND INGOOD CHG SAL OUTGOOD DSW 10uF 1uF 15nF 160kΩ 160kΩ 80kΩ 1uF R4 10kΩ